Merge branch 'develop' into feature/valere/timeline_active_call_rendering

2026-11-05 22:36:34 +00:00 · 2026-07-17 15:33:33 +02:00
parent 8109290650 c2d90ed870
commit e9fa6435fb
106 changed files with 961 additions and 536 deletions
@@ -28,6 +28,10 @@ changelog:
      labels:
        - PR-Dependencies

+    - title: 💼 Element Pro
+      labels:
+        - PR-Element-Pro
+
    - title: Others
      labels:
        - PR-misc
@@ -16,4 +16,4 @@ appId: ${MAESTRO_APP_ID}
      - extendedWaitUntil:
          visible: "Device verified"
          timeout: 30000
- tapOn: "Continue"
+- tapOn: "Done"
@@ -26,7 +26,7 @@ class DefaultContentScannerService(
    private val coroutineScope: CoroutineScope,
    coroutineDispatchers: CoroutineDispatchers,
 ) : ContentScannerService {
-    private val context = coroutineDispatchers.io.limitedParallelism(4)
+    private val dispatcher = coroutineDispatchers.io.limitedParallelism(4)

    override fun scan(eventId: EventId, mediaSources: List<MediaSource>, contentValidationState: ContentValidationState) {
        for (mediaSource in mediaSources) {
@@ -35,7 +35,7 @@ class DefaultContentScannerService(
            if (currentState != ContentValidationValue.Unknown) continue
            contentValidationState.update(url, ContentValidationValue.Loading)

-            coroutineScope.launch(context) {
+            coroutineScope.launch(dispatcher) {
                contentScanner.scan(mediaSource)
                    .onSuccess { isValid ->
                        val contentValidationValue = if (isValid) ContentValidationValue.Valid else ContentValidationValue.Invalid
@@ -32,7 +32,7 @@ import java.io.FileNotFoundException
@OptIn(ExperimentalCoroutinesApi::class)
 class DefaultContentScannerServiceTest {
    @Test
-    fun `scan with no media sources returns valid`() = runTest {
+    fun `scan with no media sources returns unknown`() = runTest {
        val scanLambda = lambdaRecorder<MediaSource, Result<Boolean>> { Result.success(true) }
        val scanner = FakeContentScanner(scan = scanLambda)
        val contentValidationState = DefaultContentValidationState()
@@ -45,7 +45,7 @@ class DefaultContentScannerServiceTest {
        )

        scanLambda.assertions().isNeverCalled()
-        assertThat(contentValidationState.getCurrentOverallState()).isEqualTo(ContentValidationValue.Valid)
+        assertThat(contentValidationState.getCurrentOverallState()).isEqualTo(ContentValidationValue.Unknown)
    }

    @Test
@@ -18,6 +18,7 @@ import androidx.compose.runtime.Composable
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.semantics.Role
 import androidx.compose.ui.unit.dp
 import io.element.android.compound.theme.ElementTheme
 import io.element.android.compound.tokens.generated.CompoundIcons
@@ -40,7 +41,7 @@ fun AccountProviderOtherView(
    Column(
        modifier = modifier
            .fillMaxWidth()
-            .clickable { onClick() }
+            .clickable(role = Role.Button) { onClick() }
    ) {
        HorizontalDivider()
        Row(
@@ -19,6 +19,7 @@ import androidx.compose.runtime.Composable
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.semantics.Role
 import androidx.compose.ui.tooling.preview.PreviewParameter
 import androidx.compose.ui.unit.dp
 import io.element.android.compound.theme.ElementTheme
@@ -45,7 +46,7 @@ fun AccountProviderView(
    Column(
        modifier = modifier
            .fillMaxWidth()
-            .clickable { onClick() }
+            .clickable(role = Role.Button) { onClick() }
    ) {
        HorizontalDivider()
        Column(
@@ -36,6 +36,7 @@ import androidx.compose.ui.focus.FocusDirection
 import androidx.compose.ui.platform.LocalAutofillManager
 import androidx.compose.ui.platform.LocalFocusManager
 import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.semantics.Role
 import androidx.compose.ui.semantics.contentType
 import androidx.compose.ui.semantics.semantics
 import androidx.compose.ui.text.input.ImeAction
@@ -211,10 +212,15 @@ private fun LoginForm(
            singleLine = true,
            trailingIcon = if (loginFieldState.isNotEmpty()) {
                {
-                    Box(Modifier.clickable {
-                        loginFieldState = ""
-                        eventSink(LoginPasswordEvents.SetLogin(""))
-                    }) {
+                    Box(
+                        Modifier.clickable(
+                            onClickLabel = stringResource(CommonStrings.action_clear),
+                            role = Role.Button,
+                        ) {
+                            loginFieldState = ""
+                            eventSink(LoginPasswordEvents.SetLogin(""))
+                        }
+                    ) {
                        Icon(
                            imageVector = CompoundIcons.Close(),
                            contentDescription = stringResource(CommonStrings.action_clear),
@@ -27,6 +27,7 @@ import androidx.compose.ui.BiasAlignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.res.painterResource
 import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.semantics.Role
 import androidx.compose.ui.text.style.TextAlign
 import androidx.compose.ui.tooling.preview.PreviewParameter
 import androidx.compose.ui.unit.dp
@@ -336,7 +337,7 @@ private fun OnBoardingButtons(
            } else {
                Text(
                    modifier = Modifier
-                        .clickable {
+                        .clickable(role = Role.Button) {
                            state.eventSink(OnBoardingEvents.OnVersionClick)
                        }
                        .padding(16.dp),
@@ -17,7 +17,6 @@ import androidx.compose.runtime.remember
 import androidx.compose.runtime.rememberCoroutineScope
 import androidx.compose.runtime.setValue
 import dev.zacsweers.metro.Inject
-import io.element.android.features.login.impl.accesscontrol.DefaultAccountProviderAccessControl
 import io.element.android.features.login.impl.qrcode.QrCodeLoginManager
 import io.element.android.libraries.architecture.AsyncAction
 import io.element.android.libraries.architecture.Presenter
@@ -39,7 +38,6 @@ class QrCodeScanPresenter(
    private val qrCodeLoginDataFactory: MatrixQrCodeLoginDataFactory,
    private val qrCodeLoginManager: QrCodeLoginManager,
    private val coroutineDispatchers: CoroutineDispatchers,
-    private val defaultAccountProviderAccessControl: DefaultAccountProviderAccessControl,
 ) : Presenter<QrCodeScanState> {
    private var isScanning by mutableStateOf(true)

@@ -97,13 +95,6 @@ class QrCodeScanPresenter(
                val data = qrCodeLoginDataFactory.parseQrCodeData(code).onFailure {
                    Timber.e(it, "Error parsing QR code data")
                }.getOrThrow()
-                val serverName = data.serverName()
-                if (serverName != null) {
-                    defaultAccountProviderAccessControl.assertIsAllowedToConnectToAccountProvider(
-                        title = serverName,
-                        accountProviderUrl = serverName,
-                    )
-                }
                data
            }.runCatchingUpdatingState(codeScannedAction)
        }.invokeOnCompletion {
@@ -34,6 +34,7 @@ import androidx.compose.ui.Modifier
 import androidx.compose.ui.focus.FocusDirection
 import androidx.compose.ui.platform.LocalFocusManager
 import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.semantics.Role
 import androidx.compose.ui.text.input.ImeAction
 import androidx.compose.ui.text.input.KeyboardType
 import androidx.compose.ui.tooling.preview.PreviewParameter
@@ -125,10 +126,15 @@ fun SearchAccountProviderView(
                        singleLine = true,
                        trailingIcon = if (userInputState.isNotEmpty()) {
                            {
-                                Box(Modifier.clickable {
-                                    userInputState = ""
-                                    eventSink(SearchAccountProviderEvents.UserInput(""))
-                                }) {
+                                Box(
+                                    Modifier.clickable(
+                                        onClickLabel = stringResource(CommonStrings.action_clear),
+                                        role = Role.Button,
+                                    ) {
+                                        userInputState = ""
+                                        eventSink(SearchAccountProviderEvents.UserInput(""))
+                                    }
+                                ) {
                                    Icon(
                                        imageVector = CompoundIcons.Close(),
                                        contentDescription = stringResource(CommonStrings.action_clear)
@@ -9,18 +9,12 @@
 package io.element.android.features.login.impl.screens.qrcode.scan

 import com.google.common.truth.Truth.assertThat
-import io.element.android.features.enterprise.api.EnterpriseService
-import io.element.android.features.enterprise.test.FakeEnterpriseService
-import io.element.android.features.login.impl.accesscontrol.DefaultAccountProviderAccessControl
-import io.element.android.features.login.impl.changeserver.AccountProviderAccessException
 import io.element.android.features.login.impl.qrcode.FakeQrCodeLoginManager
-import io.element.android.features.wellknown.test.FakeWellknownRetriever
 import io.element.android.libraries.core.coroutine.CoroutineDispatchers
 import io.element.android.libraries.matrix.api.auth.qrlogin.QrCodeLoginStep
 import io.element.android.libraries.matrix.api.auth.qrlogin.QrLoginException
 import io.element.android.libraries.matrix.test.auth.qrlogin.FakeMatrixQrCodeLoginData
 import io.element.android.libraries.matrix.test.auth.qrlogin.FakeMatrixQrCodeLoginDataFactory
-import io.element.android.libraries.wellknown.api.WellknownRetriever
 import io.element.android.tests.testutils.lambda.lambdaRecorder
 import io.element.android.tests.testutils.test
 import io.element.android.tests.testutils.testCoroutineDispatchers
@@ -53,9 +47,6 @@ class QrCodeScanPresenterTest {
        )
        val presenter = createQrCodeScanPresenter(
            qrCodeLoginDataFactory = qrCodeLoginDataFactory,
-            enterpriseService = FakeEnterpriseService(
-                isAllowedToConnectToHomeserverResult = { true },
-            )
        )
        presenter.test {
            val initialState = awaitItem()
@@ -66,44 +57,6 @@ class QrCodeScanPresenterTest {
        }
    }

-    @Test
-    fun `present - scanned QR code successfully, but homeserver not allowed`() = runTest {
-        val qrCodeLoginDataFactory = FakeMatrixQrCodeLoginDataFactory(
-            parseQrCodeLoginDataResult = {
-                Result.success(
-                    FakeMatrixQrCodeLoginData(
-                        serverNameResult = { "example.com" }
-                    )
-                )
-            }
-        )
-        val presenter = createQrCodeScanPresenter(
-            qrCodeLoginDataFactory = qrCodeLoginDataFactory,
-            enterpriseService = FakeEnterpriseService(
-                isAllowedToConnectToHomeserverResult = { false },
-                defaultHomeserverListResult = { listOf("element.io") },
-            )
-        )
-        presenter.test {
-            val initialState = awaitItem()
-            initialState.eventSink(QrCodeScanEvents.QrCodeScanned(byteArrayOf()))
-            assertThat(awaitItem().isScanning).isFalse()
-            assertThat(awaitItem().authenticationAction.isLoading()).isTrue()
-            awaitItem().also { state ->
-                assertThat(
-                    (state.authenticationAction
-                        .errorOrNull() as AccountProviderAccessException.UnauthorizedAccountProviderException).unauthorisedAccountProviderTitle
-                )
-                    .isEqualTo("example.com")
-                assertThat(
-                    (state.authenticationAction
-                        .errorOrNull() as AccountProviderAccessException.UnauthorizedAccountProviderException).authorisedAccountProviderTitles
-                )
-                    .containsExactly("element.io")
-            }
-        }
-    }
-
    @Test
    fun `present - scanned QR code failed and can be retried`() = runTest {
        val qrCodeLoginDataFactory = FakeMatrixQrCodeLoginDataFactory(
@@ -153,15 +106,9 @@ class QrCodeScanPresenterTest {
        qrCodeLoginDataFactory: FakeMatrixQrCodeLoginDataFactory = FakeMatrixQrCodeLoginDataFactory(),
        coroutineDispatchers: CoroutineDispatchers = testCoroutineDispatchers(),
        qrCodeLoginManager: FakeQrCodeLoginManager = FakeQrCodeLoginManager(),
-        enterpriseService: EnterpriseService = FakeEnterpriseService(),
-        wellknownRetriever: WellknownRetriever = FakeWellknownRetriever(),
    ) = QrCodeScanPresenter(
        qrCodeLoginDataFactory = qrCodeLoginDataFactory,
        qrCodeLoginManager = qrCodeLoginManager,
        coroutineDispatchers = coroutineDispatchers,
-        defaultAccountProviderAccessControl = DefaultAccountProviderAccessControl(
-            enterpriseService = enterpriseService,
-            wellknownRetriever = wellknownRetriever,
-        ),
    )
 }
@@ -22,8 +22,8 @@ import io.element.android.libraries.matrix.ui.media.contentvalidation.ContentVal
 fun TimelineItemAudioView(
    content: TimelineItemAudioContent,
    onContentLayoutChange: (ContentAvoidingLayoutData) -> Unit,
+    contentValidationValue: ContentValidationValue,
    modifier: Modifier = Modifier,
-    contentValidationValue: ContentValidationValue = ContentValidationValue.Valid,
 ) {
    TimelineItemAttachmentView(
        icon = CompoundIcons.Audio(),
@@ -43,5 +43,6 @@ internal fun TimelineItemAudioViewPreview(@PreviewParameter(TimelineItemAudioCon
        TimelineItemAudioView(
            content,
            onContentLayoutChange = {},
+            contentValidationValue = ContentValidationValue.Valid,
        )
    }
@@ -27,8 +27,8 @@ import io.element.android.libraries.ui.strings.CommonStrings
 fun TimelineItemFileView(
    content: TimelineItemFileContent,
    onContentLayoutChange: (ContentAvoidingLayoutData) -> Unit,
+    contentValidationValue: ContentValidationValue,
    modifier: Modifier = Modifier,
-    contentValidationValue: ContentValidationValue = ContentValidationValue.Valid,
 ) {
    TimelineItemAttachmentView(
        icon = CompoundIcons.Attachment(),
@@ -48,6 +48,7 @@ internal fun TimelineItemFileViewPreview(@PreviewParameter(TimelineItemFileConte
        TimelineItemFileView(
            content,
            onContentLayoutChange = {},
+            contentValidationValue = ContentValidationValue.Valid,
        )
    }
 }
@@ -288,9 +288,15 @@ private fun GalleryItemCell(
    Box(
        modifier = modifier
            .blurHashBackground(item.blurhash, alpha = 0.9f)
-            .combinedClickable(
-                onClick = onClick,
-                onLongClick = onLongClick,
+            .then(
+                if (itemContentValidationState.isValid()) {
+                    Modifier.combinedClickable(
+                        onClick = onClick,
+                        onLongClick = onLongClick,
+                    )
+                } else {
+                    Modifier
+                }
            ),
        contentAlignment = Alignment.Center,
    ) {
@@ -15,6 +15,7 @@ import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.wrapContentWidth
 import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.CompositionLocalProvider
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
@@ -43,7 +44,9 @@ import io.element.android.libraries.designsystem.preview.ElementPreview
 import io.element.android.libraries.designsystem.preview.PreviewsDayNight
 import io.element.android.libraries.designsystem.theme.components.CircularProgressIndicator
 import io.element.android.libraries.matrix.ui.media.contentvalidation.ContentValidationState
-import io.element.android.libraries.matrix.ui.media.contentvalidation.DefaultContentValidationState
+import io.element.android.libraries.matrix.ui.media.contentvalidation.LocalEventContentValidationState
+import io.element.android.libraries.matrix.ui.media.contentvalidation.NoopContentValidationState
+import io.element.android.libraries.matrix.ui.media.contentvalidation.NoopEventContentValidationCache
 import io.element.android.libraries.matrix.ui.media.contentvalidation.collectOverallState
 import io.element.android.libraries.ui.strings.CommonStrings
 import io.element.android.libraries.ui.utils.a11y.isTalkbackActive
@@ -55,8 +58,8 @@ fun TimelineItemImageView(
    onContentClick: (() -> Unit)?,
    onLongClick: (() -> Unit)?,
    onShowContentClick: () -> Unit,
+    contentValidationState: ContentValidationState,
    modifier: Modifier = Modifier,
-    contentValidationState: ContentValidationState = remember { DefaultContentValidationState() },
 ) {
    val a11yLabel = stringResource(CommonStrings.common_image)
    val description = content.caption?.let { "$a11yLabel: $it" } ?: a11yLabel
@@ -129,52 +132,56 @@ internal fun TimelineItemImageViewPreview(@PreviewParameter(TimelineItemImageCon
        onShowContentClick = {},
        onContentClick = {},
        onLongClick = {},
+        contentValidationState = NoopContentValidationState(),
    )
 }

@PreviewsDayNight
@Composable
 internal fun TimelineItemImageViewHideMediaContentPreview() = ElementPreview {
-    TimelineItemImageView(
-        content = aTimelineItemImageContent(),
-        hideMediaContent = true,
-        onShowContentClick = {},
-        onContentClick = {},
-        onLongClick = {},
-    )
+        TimelineItemImageView(
+            content = aTimelineItemImageContent(),
+            hideMediaContent = true,
+            onShowContentClick = {},
+            onContentClick = {},
+            onLongClick = {},
+            contentValidationState = NoopContentValidationState(),
+        )
 }

@PreviewsDayNight
@Composable
 internal fun ATimelineItemEventRowPreview() = ElementPreview {
-    Column {
-        sequenceOf(false, true).forEach { isMine ->
+    CompositionLocalProvider(LocalEventContentValidationState provides NoopEventContentValidationCache()) {
+        Column {
+            sequenceOf(false, true).forEach { isMine ->
+                ATimelineItemEventRow(
+                    event = aTimelineItemEvent(
+                        isMine = isMine,
+                        content = aTimelineItemImageContent(
+                            filename = "image.jpg",
+                            caption = "A long caption that may wrap into several lines",
+                            width = 40,
+                            height = 20,
+                            aspectRatio = 40f / 20f,
+                        ),
+                        groupPosition = TimelineItemGroupPosition.Last,
+                    ),
+                )
+            }
            ATimelineItemEventRow(
                event = aTimelineItemEvent(
-                    isMine = isMine,
+                    isMine = false,
                    content = aTimelineItemImageContent(
                        filename = "image.jpg",
-                        caption = "A long caption that may wrap into several lines",
-                        width = 40,
-                        height = 20,
-                        aspectRatio = 40f / 20f,
+                        caption = "Narrow image with null aspectRatio",
+                        width = 80,
+                        height = 150,
+                        aspectRatio = null,
                    ),
                    groupPosition = TimelineItemGroupPosition.Last,
                ),
            )
        }
-        ATimelineItemEventRow(
-            event = aTimelineItemEvent(
-                isMine = false,
-                content = aTimelineItemImageContent(
-                    filename = "image.jpg",
-                    caption = "Narrow image with null aspectRatio",
-                    width = 80,
-                    height = 150,
-                    aspectRatio = null,
-                ),
-                groupPosition = TimelineItemGroupPosition.Last,
-            ),
-        )
    }
 }
@@ -39,7 +39,7 @@ import io.element.android.libraries.designsystem.preview.PreviewsDayNight
 import io.element.android.libraries.designsystem.theme.components.CircularProgressIndicator
 import io.element.android.libraries.matrix.ui.media.MediaRequestData
 import io.element.android.libraries.matrix.ui.media.contentvalidation.ContentValidationState
-import io.element.android.libraries.matrix.ui.media.contentvalidation.DefaultContentValidationState
+import io.element.android.libraries.matrix.ui.media.contentvalidation.NoopContentValidationState
 import io.element.android.libraries.matrix.ui.media.contentvalidation.collectOverallState
 import io.element.android.libraries.ui.strings.CommonStrings

@@ -52,8 +52,8 @@ fun TimelineItemStickerView(
    onContentClick: (() -> Unit)?,
    onLongClick: (() -> Unit)?,
    onShowClick: () -> Unit,
+    contentValidationState: ContentValidationState,
    modifier: Modifier = Modifier,
-    contentValidationState: ContentValidationState = remember { DefaultContentValidationState() },
 ) {
    val description = content.bestDescription.takeIf { it.isNotEmpty() } ?: stringResource(CommonStrings.common_image)

@@ -130,5 +130,6 @@ internal fun TimelineItemStickerViewPreview(@PreviewParameter(TimelineItemSticke
        onContentClick = {},
        onLongClick = {},
        onShowClick = {},
+        contentValidationState = NoopContentValidationState(),
    )
 }
@@ -51,7 +51,7 @@ import io.element.android.libraries.matrix.ui.media.MAX_THUMBNAIL_HEIGHT
 import io.element.android.libraries.matrix.ui.media.MAX_THUMBNAIL_WIDTH
 import io.element.android.libraries.matrix.ui.media.MediaRequestData
 import io.element.android.libraries.matrix.ui.media.contentvalidation.ContentValidationState
-import io.element.android.libraries.matrix.ui.media.contentvalidation.DefaultContentValidationState
+import io.element.android.libraries.matrix.ui.media.contentvalidation.NoopContentValidationState
 import io.element.android.libraries.matrix.ui.media.contentvalidation.collectOverallState
 import io.element.android.libraries.ui.strings.CommonStrings
 import io.element.android.libraries.ui.utils.a11y.isTalkbackActive
@@ -63,8 +63,8 @@ fun TimelineItemVideoView(
    onContentClick: (() -> Unit)?,
    onLongClick: (() -> Unit)?,
    onShowContentClick: () -> Unit,
+    contentValidationState: ContentValidationState,
    modifier: Modifier = Modifier,
-    contentValidationState: ContentValidationState = remember { DefaultContentValidationState() },
 ) {
    val isTalkbackActive = isTalkbackActive()
    val a11yLabel = stringResource(CommonStrings.common_video)
@@ -157,6 +157,7 @@ internal fun TimelineItemVideoViewPreview(@PreviewParameter(TimelineItemVideoCon
        onShowContentClick = {},
        onContentClick = {},
        onLongClick = {},
+        contentValidationState = NoopContentValidationState(),
    )
 }

@@ -169,5 +170,6 @@ internal fun TimelineItemVideoViewHideMediaContentPreview() = ElementPreview {
        onShowContentClick = {},
        onContentClick = {},
        onLongClick = {},
+        contentValidationState = NoopContentValidationState(),
    )
 }
@@ -64,8 +64,8 @@ fun TimelineItemVoiceView(
    state: VoiceMessageState,
    content: TimelineItemVoiceContent,
    onContentLayoutChange: (ContentAvoidingLayoutData) -> Unit,
+    contentValidationValue: ContentValidationValue,
    modifier: Modifier = Modifier,
-    contentValidationValue: ContentValidationValue = ContentValidationValue.Valid,
 ) {
    fun playPause() {
        state.eventSink(VoiceMessageEvent.PlayPause)
@@ -289,6 +289,7 @@ internal fun TimelineItemVoiceViewPreview(
        state = timelineItemVoiceViewParameters.state,
        content = timelineItemVoiceViewParameters.content,
        onContentLayoutChange = {},
+        contentValidationValue = ContentValidationValue.Valid,
    )
 }

@@ -302,6 +303,7 @@ internal fun TimelineItemVoiceViewUnifiedPreview() = ElementPreview {
                state = it.state,
                content = it.content,
                onContentLayoutChange = {},
+                contentValidationValue = ContentValidationValue.Valid,
            )
        }
    }
@@ -66,7 +66,8 @@ fun OutgoingVerificationView(
    fun cancelOrResetFlow() {
        when (step) {
            is Step.Canceled -> state.eventSink(OutgoingVerificationViewEvents.Reset)
-            Step.Initial, Step.Completed -> onBack()
+            Step.Initial -> onBack()
+            Step.Completed -> onFinish()
            Step.Ready, is Step.AwaitingOtherDeviceResponse -> state.eventSink(OutgoingVerificationViewEvents.Cancel)
            is Step.Verifying -> {
                if (!step.state.isLoading()) {
@@ -96,7 +97,9 @@ fun OutgoingVerificationView(
                TopAppBar(
                    title = {},
                    navigationIcon = {
-                        BackButton(onClick = ::cancelOrResetFlow)
+                        if (step !is Step.Completed) {
+                            BackButton(onClick = ::cancelOrResetFlow)
+                        }
                    },
                    colors = topAppBarColors(containerColor = Color.Transparent),
                )
@@ -108,7 +111,7 @@ fun OutgoingVerificationView(
                OutgoingVerificationBottomMenu(
                    state = state,
                    onCancelClick = ::cancelOrResetFlow,
-                    onContinueClick = onFinish,
+                    onDoneClick = onFinish,
                )
            },
            isScrollable = true,
@@ -244,7 +247,7 @@ private fun ContentInitial(
 private fun OutgoingVerificationBottomMenu(
    state: OutgoingVerificationState,
    onCancelClick: () -> Unit,
-    onContinueClick: () -> Unit,
+    onDoneClick: () -> Unit,
 ) {
    val eventSink = state.eventSink
    when (val step = state.step) {
@@ -313,8 +316,8 @@ private fun OutgoingVerificationBottomMenu(
            VerificationBottomMenu {
                Button(
                    modifier = Modifier.fillMaxWidth(),
-                    text = stringResource(CommonStrings.action_continue),
-                    onClick = onContinueClick,
+                    text = stringResource(CommonStrings.action_done),
+                    onClick = onDoneClick,
                )
                InvisibleButton()
            }
@@ -99,10 +99,10 @@ class OutgoingVerificationViewTest : RobolectricTest() {
    }

    @Test
-    fun `back key pressed - on Completed exits the flow`() = runAndroidComposeUiTest {
+    fun `back key pressed - on Completed finishes the flow`() = runAndroidComposeUiTest {
        ensureCalledOnce { callback ->
            setOutgoingVerificationView(
-                onBack = callback,
+                onFinished = callback,
                state = anOutgoingVerificationState(
                    step = OutgoingVerificationState.Step.Completed,
                ),
@@ -112,7 +112,7 @@ class OutgoingVerificationViewTest : RobolectricTest() {
    }

    @Test
-    fun `when flow is completed and the user clicks on the continue button, the expected callback is invoked`() = runAndroidComposeUiTest {
+    fun `when flow is completed and the user clicks on the done button, the expected callback is invoked`() = runAndroidComposeUiTest {
        val eventsRecorder = EventsRecorder<OutgoingVerificationViewEvents>(expectEvents = false)
        ensureCalledOnce { callback ->
            setOutgoingVerificationView(
@@ -122,7 +122,7 @@ class OutgoingVerificationViewTest : RobolectricTest() {
                ),
                onFinished = callback,
            )
-            clickOn(CommonStrings.action_continue)
+            clickOn(CommonStrings.action_done)
        }
    }

@@ -7,7 +7,7 @@ android_gradle_plugin = "9.2.1"
 # When updating this, please also update the version in the file ./idea/kotlinc.xml
 kotlin = "2.4.0"
 kotlinpoet = "2.3.0"
-ksp = "2.3.9"
+ksp = "2.3.10"
 firebaseAppDistribution = "5.3.0"

 # AndroidX
@@ -88,7 +88,7 @@ google_firebase_bom = "com.google.firebase:firebase-bom:34.15.0"
 firebase_appdistribution_gradle = { module = "com.google.firebase:firebase-appdistribution-gradle", version.ref = "firebaseAppDistribution" }
 autonomousapps_dependencyanalysis_plugin = { module = "com.autonomousapps:dependency-analysis-gradle-plugin", version.ref = "dependencyAnalysis" }
 ksp_plugin = { module = "com.google.devtools.ksp:symbol-processing-api", version.ref = "ksp" }
-google_tink = "com.google.crypto.tink:tink-android:1.22.0"
+google_tink = "com.google.crypto.tink:tink-android:1.23.0"
 jna = "net.java.dev.jna:jna:5.19.1"

 # AndroidX
@@ -208,7 +208,7 @@ matrix_richtexteditor_compose = { module = "io.element.android:wysiwyg-compose",
 sqldelight-driver-android = { module = "app.cash.sqldelight:android-driver", version.ref = "sqldelight" }
 sqldelight-driver-jvm = { module = "app.cash.sqldelight:sqlite-driver", version.ref = "sqldelight" }
 sqldelight-coroutines = { module = "app.cash.sqldelight:coroutines-extensions", version.ref = "sqldelight" }
-sqlcipher = "net.zetetic:sqlcipher-android:4.16.0"
+sqlcipher = "net.zetetic:sqlcipher-android:4.17.0"
 sqlite = "androidx.sqlite:sqlite-ktx:2.7.0"
 unifiedpush = "org.unifiedpush.android:connector:3.3.3"
 vanniktech_blurhash = "com.vanniktech:blurhash:0.3.0"
@@ -116,6 +116,7 @@ class DefaultContentValidationState(

 private fun calculateOverallState(states: Map<String, ContentValidationValue>): ContentValidationValue {
    return when {
+        states.values.isEmpty() -> ContentValidationValue.Unknown
        states.values.any { it is ContentValidationValue.Invalid } -> ContentValidationValue.Invalid
        states.values.any { it is ContentValidationValue.Loading } -> ContentValidationValue.Loading
        states.values.any { it is ContentValidationValue.UnrecoverableError } -> states.values.first { it is ContentValidationValue.UnrecoverableError }
@@ -26,8 +26,10 @@ val LocalEventContentValidationState = staticCompositionLocalOf<EventContentVali
 /**
 * A noop implementation of the [EventContentValidationCache] that immediately returns a successful validation state. This will be used in FOSS.
 */
-class NoopEventContentValidationCache : EventContentValidationCache {
-    override operator fun get(eventId: EventId): ContentValidationState = noopValue
+class NoopEventContentValidationCache(
+    private val provided: ContentValidationState = noopValue,
+) : EventContentValidationCache {
+    override operator fun get(eventId: EventId): ContentValidationState = provided
 }

 /**
@@ -39,6 +39,7 @@ dependencies {

    implementation(projects.features.enterprise.api)
    implementation(projects.features.viewfolder.api)
+    implementation(projects.features.contentscanner.api)
    implementation(projects.libraries.androidutils)
    implementation(projects.libraries.architecture)
    implementation(projects.libraries.audio.api)
@@ -48,6 +49,7 @@ dependencies {
    implementation(projects.libraries.designsystem)
    implementation(projects.libraries.featureflag.api)
    implementation(projects.libraries.matrix.api)
+    implementation(projects.libraries.matrixui)
    implementation(projects.libraries.matrixmedia.api)
    implementation(projects.libraries.uiStrings)
    implementation(projects.libraries.uiUtils)
@@ -44,6 +44,8 @@ import io.element.android.libraries.matrix.api.timeline.item.event.VideoMessageT
 import io.element.android.libraries.matrix.api.timeline.item.event.VoiceMessageType
 import io.element.android.libraries.matrix.api.timeline.item.event.getAvatarUrl
 import io.element.android.libraries.matrix.api.timeline.item.event.getDisambiguatedDisplayName
+import io.element.android.libraries.matrix.ui.media.contentvalidation.EventContentValidationCache
+import io.element.android.libraries.matrix.ui.media.contentvalidation.NoopContentValidationState
 import io.element.android.libraries.mediaviewer.api.MediaInfo
 import io.element.android.libraries.mediaviewer.api.util.FileExtensionExtractor
 import io.element.android.libraries.mediaviewer.impl.model.MediaItem
@@ -54,6 +56,7 @@ class EventItemFactory(
    private val fileSizeFormatter: FileSizeFormatter,
    private val fileExtensionExtractor: FileExtensionExtractor,
    private val dateFormatter: DateFormatter,
+    private val contentValidationCache: EventContentValidationCache,
 ) {
    fun create(
        currentTimelineItem: MatrixTimelineItem.Event,
@@ -67,6 +70,8 @@ class EventItemFactory(
            timestamp = currentTimelineItem.event.timestamp,
            mode = DateFormatterMode.Full,
        )
+        val validationState = currentTimelineItem.eventId?.let { contentValidationCache[it] }
+            ?: NoopContentValidationState()
        return when (val content = event.content) {
            is CallNotifyContent,
            is FailedToParseMessageLikeContent,
@@ -117,6 +122,7 @@ class EventItemFactory(
                                        mediaSource = c.source,
                                        thumbnailSource = c.info?.thumbnailSource,
                                        blurHash = c.info?.blurhash,
+                                        validationState = validationState,
                                    )
                                }
                                is GalleryItemType.Video -> {
@@ -138,6 +144,7 @@ class EventItemFactory(
                                        mediaSource = c.source,
                                        thumbnailSource = c.info?.thumbnailSource,
                                        blurHash = c.info?.blurhash,
+                                        validationState = validationState,
                                    )
                                }
                                is GalleryItemType.Audio -> {
@@ -156,6 +163,7 @@ class EventItemFactory(
                                            dateSentFull = dateSentFull,
                                        ),
                                        mediaSource = c.source,
+                                        validationState = validationState,
                                    )
                                }
                                is GalleryItemType.File -> {
@@ -174,6 +182,7 @@ class EventItemFactory(
                                            dateSentFull = dateSentFull,
                                        ),
                                        mediaSource = c.source,
+                                        validationState = validationState,
                                    )
                                }
                                is GalleryItemType.Other -> null
@@ -200,6 +209,7 @@ class EventItemFactory(
                            duration = null,
                        ),
                        mediaSource = type.source,
+                        validationState = validationState,
                    ))
                    is FileMessageType -> listOf(MediaItem.File(
                        id = currentTimelineItem.uniqueId,
@@ -221,6 +231,7 @@ class EventItemFactory(
                            duration = null,
                        ),
                        mediaSource = type.source,
+                        validationState = validationState,
                        // TODO We may want to add a thumbnailSource and set it to type.info?.thumbnailSource
                    ))
                    is ImageMessageType -> listOf(MediaItem.Image(
@@ -245,6 +256,7 @@ class EventItemFactory(
                        mediaSource = type.source,
                        thumbnailSource = type.info?.thumbnailSource,
                        blurHash = type.info?.blurhash,
+                        validationState = validationState,
                    ))
                    is StickerMessageType -> listOf(MediaItem.Image(
                        id = currentTimelineItem.uniqueId,
@@ -268,6 +280,7 @@ class EventItemFactory(
                        mediaSource = type.source,
                        thumbnailSource = type.info?.thumbnailSource,
                        blurHash = type.info?.blurhash,
+                        validationState = validationState,
                    ))
                    is VideoMessageType -> listOf(MediaItem.Video(
                        id = currentTimelineItem.uniqueId,
@@ -291,6 +304,7 @@ class EventItemFactory(
                        mediaSource = type.source,
                        thumbnailSource = type.info?.thumbnailSource,
                        blurHash = type.info?.blurhash,
+                        validationState = validationState,
                    ))
                    is VoiceMessageType -> listOf(MediaItem.Voice(
                        id = currentTimelineItem.uniqueId,
@@ -312,6 +326,7 @@ class EventItemFactory(
                            duration = type.info?.duration?.inWholeMilliseconds?.toHumanReadableDuration(),
                        ),
                        mediaSource = type.source,
+                        validationState = validationState,
                    ))
                }
            }
@@ -20,6 +20,7 @@ import androidx.compose.runtime.setValue
 import dev.zacsweers.metro.Assisted
 import dev.zacsweers.metro.AssistedFactory
 import dev.zacsweers.metro.AssistedInject
+import io.element.android.features.contentscanner.api.ContentScannerService
 import io.element.android.libraries.androidutils.R
 import io.element.android.libraries.architecture.AsyncData
 import io.element.android.libraries.architecture.Presenter
@@ -43,7 +44,11 @@ import io.element.android.libraries.mediaviewer.impl.model.eventId
 import io.element.android.libraries.mediaviewer.impl.model.mediaInfo
 import io.element.android.libraries.mediaviewer.impl.model.mediaPermissions
 import io.element.android.libraries.mediaviewer.impl.model.mediaSource
+import io.element.android.libraries.mediaviewer.impl.model.thumbnailSource
 import io.element.android.libraries.ui.strings.CommonStrings
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.flow.first
+import kotlinx.coroutines.flow.onEach
 import kotlinx.coroutines.launch

@AssistedInject
@@ -55,6 +60,7 @@ class MediaGalleryPresenter(
    private val mediaLoader: MatrixMediaLoader,
    private val localMediaActions: LocalMediaActions,
    private val snackbarDispatcher: SnackbarDispatcher,
+    private val contentScannerService: ContentScannerService,
 ) : Presenter<MediaGalleryState> {
    @AssistedFactory
    interface Factory {
@@ -74,6 +80,17 @@ class MediaGalleryPresenter(

        val groupedMediaItems by remember {
            mediaGalleryDataSource.groupedMediaItemsFlow()
+                .onEach { groupedItems ->
+                    if (groupedItems is AsyncData.Success) {
+                        val items = groupedItems.data.getItems(mode)
+                        items.forEach { item ->
+                            if (item is MediaItem.Event) {
+                                val eventId = item.eventId() ?: return@forEach
+                                coroutineScope.validateMedia(eventId, item)
+                            }
+                        }
+                    }
+                }
        }
            .collectAsState(AsyncData.Uninitialized)

@@ -220,6 +237,21 @@ class MediaGalleryPresenter(
            }
    }

+    private fun CoroutineScope.validateMedia(eventId: EventId, mediaItem: MediaItem.Event) {
+        launch {
+            val thumbnailSource = mediaItem.thumbnailSource()
+            val mediaSource = mediaItem.mediaSource()
+            val contentValidationState = mediaItem.validationState
+            val currentState = contentValidationState.overallStateFlow.first()
+
+            if (currentState.isLoading() || currentState.isValid()) {
+                return@launch
+            }
+
+            contentScannerService.scan(eventId, listOfNotNull(thumbnailSource, mediaSource).distinct(), contentValidationState)
+        }
+    }
+
    private fun mediaActionsError(throwable: Throwable): Int {
        return if (throwable is ActivityNotFoundException) {
            R.string.error_no_compatible_app_found
@@ -13,6 +13,8 @@ import io.element.android.libraries.architecture.AsyncData
 import io.element.android.libraries.designsystem.components.media.WaveFormSamples
 import io.element.android.libraries.designsystem.preview.ROOM_NAME
 import io.element.android.libraries.matrix.api.core.UniqueId
+import io.element.android.libraries.matrix.ui.media.contentvalidation.ContentValidationValue
+import io.element.android.libraries.matrix.ui.media.contentvalidation.NoopContentValidationState
 import io.element.android.libraries.mediaviewer.impl.details.MediaBottomSheetState
 import io.element.android.libraries.mediaviewer.impl.details.aMediaBottomSheetStateDetails
 import io.element.android.libraries.mediaviewer.impl.model.GroupedMediaItems
@@ -47,9 +49,20 @@ open class MediaGalleryStateProvider : PreviewParameterProvider<MediaGalleryStat
                            aMediaItemImage(id = UniqueId("3")),
                            aMediaItemVideo(id = UniqueId("4")),
                            aMediaItemImage(id = UniqueId("5")),
-                            aMediaItemImage(id = UniqueId("6")),
-                            aMediaItemImage(id = UniqueId("7")),
-                            aMediaItemImage(id = UniqueId("8")),
+                            aMediaItemImage(
+                                id = UniqueId("6"),
+                                validationState = NoopContentValidationState(ContentValidationValue.Loading),
+                                blurHash = "LKO2?U%2Tw=w]~RBVZRi};RPxuwH"
+                            ),
+                            aMediaItemImage(id = UniqueId("7"), validationState = NoopContentValidationState(ContentValidationValue.Invalid)),
+                            aMediaItemImage(
+                                id = UniqueId("8"),
+                                validationState = NoopContentValidationState(
+                                    ContentValidationValue.UnrecoverableError(
+                                        IllegalStateException("Failed to validate media item")
+                                    )
+                                )
+                            ),
                            aMediaItemImage(id = UniqueId("9")),
                            aMediaItemLoadingIndicator(),
                        ).toImmutableList()
@@ -65,7 +78,7 @@ open class MediaGalleryStateProvider : PreviewParameterProvider<MediaGalleryStat
                    aGroupedMediaItems(
                        fileItems = listOf(
                            aMediaItemDateSeparator(id = UniqueId("0")),
-                            aMediaItemFile(id = UniqueId("1")),
+                            aMediaItemFile(id = UniqueId("1"), validationState = NoopContentValidationState(ContentValidationValue.Loading)),
                            aMediaItemDateSeparator(
                                id = UniqueId("2"),
                                formattedDate = "September 2004",
@@ -75,6 +88,15 @@ open class MediaGalleryStateProvider : PreviewParameterProvider<MediaGalleryStat
                                id = UniqueId("5"),
                                waveform = WaveFormSamples.realisticWaveForm,
                            ),
+                            aMediaItemAudio(id = UniqueId("6"), validationState = NoopContentValidationState(ContentValidationValue.Invalid)),
+                            aMediaItemAudio(
+                                id = UniqueId("7"),
+                                validationState = NoopContentValidationState(
+                                    ContentValidationValue.UnrecoverableError(
+                                        IllegalStateException("Failed to validate media item")
+                                    )
+                                )
+                            ),
                            aMediaItemLoadingIndicator(),
                        ).toImmutableList()
                    )
@@ -9,14 +9,18 @@
 package io.element.android.libraries.mediaviewer.impl.gallery

 import androidx.activity.compose.BackHandler
+import androidx.compose.foundation.background
+import androidx.compose.foundation.clickable
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.aspectRatio
 import androidx.compose.foundation.layout.consumeWindowInsets
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.height
 import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.size
 import androidx.compose.foundation.lazy.LazyColumn
 import androidx.compose.foundation.lazy.grid.GridCells
 import androidx.compose.foundation.lazy.grid.GridItemSpan
@@ -31,6 +35,8 @@ import androidx.compose.runtime.Composable
 import androidx.compose.runtime.CompositionLocalProvider
 import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
 import androidx.compose.runtime.rememberUpdatedState
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
@@ -49,11 +55,13 @@ import io.element.android.libraries.designsystem.atomic.molecules.IconTitleSubti
 import io.element.android.libraries.designsystem.background.OnboardingBackground
 import io.element.android.libraries.designsystem.components.BigIcon
 import io.element.android.libraries.designsystem.components.async.AsyncFailure
+import io.element.android.libraries.designsystem.components.blurhash.blurHashBackground
 import io.element.android.libraries.designsystem.components.button.BackButton
 import io.element.android.libraries.designsystem.preview.ElementPreview
 import io.element.android.libraries.designsystem.preview.PreviewsDayNight
 import io.element.android.libraries.designsystem.theme.aliasScreenTitle
 import io.element.android.libraries.designsystem.theme.components.CircularProgressIndicator
+import io.element.android.libraries.designsystem.theme.components.Icon
 import io.element.android.libraries.designsystem.theme.components.LinearProgressIndicator
 import io.element.android.libraries.designsystem.theme.components.Scaffold
 import io.element.android.libraries.designsystem.theme.components.SegmentedButton
@@ -62,6 +70,9 @@ import io.element.android.libraries.designsystem.theme.components.TopAppBar
 import io.element.android.libraries.designsystem.utils.snackbar.SnackbarHost
 import io.element.android.libraries.designsystem.utils.snackbar.rememberSnackbarHostState
 import io.element.android.libraries.matrix.api.timeline.Timeline
+import io.element.android.libraries.matrix.ui.media.contentvalidation.ContentValidationValue
+import io.element.android.libraries.matrix.ui.media.contentvalidation.NoopContentValidationState
+import io.element.android.libraries.matrix.ui.media.contentvalidation.collectOverallState
 import io.element.android.libraries.mediaviewer.impl.R
 import io.element.android.libraries.mediaviewer.impl.details.MediaBottomSheetState
 import io.element.android.libraries.mediaviewer.impl.details.MediaDeleteConfirmationBottomSheet
@@ -315,6 +326,14 @@ private fun MediaGalleryFilesList(
            key = { it.id() },
            contentType = { it::class.java },
        ) { item ->
+            val contentValidationState = remember(item is MediaItem.Event) {
+                if (item is MediaItem.Event) {
+                    item.validationState
+                } else {
+                    NoopContentValidationState()
+                }
+            }
+            val contentValidationValue by contentValidationState.collectOverallState()
            when (item) {
                is MediaItem.File -> FileItemView(
                    modifier = Modifier.animateItem(),
@@ -323,6 +342,7 @@ private fun MediaGalleryFilesList(
                    onLongClick = {
                        eventSink(MediaGalleryEvent.OpenInfo(item))
                    },
+                    contentValidationState = contentValidationValue,
                )
                is MediaItem.Audio -> AudioItemView(
                    modifier = Modifier.animateItem(),
@@ -331,6 +351,7 @@ private fun MediaGalleryFilesList(
                    onLongClick = {
                        eventSink(MediaGalleryEvent.OpenInfo(item))
                    },
+                    contentValidationValue = contentValidationValue,
                )
                is MediaItem.Voice -> {
                    val presenter: Presenter<VoiceMessageState> = presenterFactories.rememberPresenter(item)
@@ -341,16 +362,17 @@ private fun MediaGalleryFilesList(
                        onLongClick = {
                            eventSink(MediaGalleryEvent.OpenInfo(item))
                        },
+                        contentValidationValue = contentValidationValue,
                    )
                }
+                is MediaItem.Image,
+                is MediaItem.Video -> {
+                    // Should not happen
+                }
                is MediaItem.DateSeparator -> DateItemView(
                    modifier = Modifier.animateItem(),
                    item = item
                )
-                is MediaItem.Image,
-                is MediaItem.Video -> {
-                    // Should not happen
-                }
                is MediaItem.LoadingIndicator -> LoadingMoreIndicator(
                    modifier = Modifier.animateItem(),
                    item = item,
@@ -387,11 +409,48 @@ private fun MediaGalleryImageGrid(
            key = { it.id() },
            contentType = { it::class.java },
        ) { item ->
+            val blurHash = when (item) {
+                is MediaItem.Image -> item.blurHash
+                is MediaItem.Video -> item.blurHash
+                else -> null
+            }
+
+            val blurHashBackgroundModifier = if (blurHash != null) {
+                Modifier.blurHashBackground(blurHash)
+            } else {
+                Modifier
+            }
+
+            val currentValidationState by when (item) {
+                is MediaItem.Event -> item.validationState.collectOverallState()
+                else -> remember { mutableStateOf(ContentValidationValue.Unknown) }
+            }
+
            when (item) {
-                is MediaItem.DateSeparator -> DateItemView(
-                    modifier = Modifier.animateItem(),
-                    item = item,
-                )
+                is MediaItem.Event if !currentValidationState.isValidated() -> {
+                    Box(modifier = blurHashBackgroundModifier.aspectRatio(1f), contentAlignment = Alignment.Center) {
+                        CircularProgressIndicator(
+                            modifier = Modifier.size(24.dp),
+                            strokeWidth = 2.dp,
+                        )
+                    }
+                }
+                is MediaItem.Event if currentValidationState.isInvalid() -> {
+                    Box(
+                        modifier = Modifier
+                            .clickable { onItemClick(item) }
+                            .background(ElementTheme.colors.bgCriticalSubtle)
+                            .aspectRatio(1f),
+                        contentAlignment = Alignment.Center,
+                    ) {
+                        Icon(
+                            modifier = Modifier.size(24.dp),
+                            imageVector = CompoundIcons.Error(),
+                            tint = ElementTheme.colors.iconCriticalPrimary,
+                            contentDescription = null,
+                        )
+                    }
+                }
                is MediaItem.Audio -> {
                    // Should not happen
                }
@@ -402,7 +461,7 @@ private fun MediaGalleryImageGrid(
                    // Should not happen
                }
                is MediaItem.Image -> ImageItemView(
-                    modifier = Modifier.animateItem(),
+                    modifier = blurHashBackgroundModifier.animateItem(),
                    image = item,
                    onClick = { onItemClick(item) },
                    onLongClick = {
@@ -410,13 +469,17 @@ private fun MediaGalleryImageGrid(
                    },
                )
                is MediaItem.Video -> VideoItemView(
-                    modifier = Modifier.animateItem(),
+                    modifier = blurHashBackgroundModifier.animateItem(),
                    video = item,
                    onClick = { onItemClick(item) },
                    onLongClick = {
                        eventSink(MediaGalleryEvent.OpenInfo(item))
                    },
                )
+                is MediaItem.DateSeparator -> DateItemView(
+                    modifier = Modifier.animateItem(),
+                    item = item,
+                )
                is MediaItem.LoadingIndicator -> LoadingMoreIndicator(
                    modifier = Modifier.animateItem(),
                    item = item,
@@ -8,117 +8,38 @@

 package io.element.android.libraries.mediaviewer.impl.gallery.ui

-import androidx.compose.foundation.background
-import androidx.compose.foundation.combinedClickable
 import androidx.compose.foundation.layout.Column
-import androidx.compose.foundation.layout.Row
-import androidx.compose.foundation.layout.Spacer
-import androidx.compose.foundation.layout.fillMaxWidth
-import androidx.compose.foundation.layout.height
-import androidx.compose.foundation.layout.padding
-import androidx.compose.foundation.layout.size
-import androidx.compose.foundation.layout.width
-import androidx.compose.foundation.shape.CircleShape
-import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.runtime.Composable
-import androidx.compose.ui.Alignment
+import androidx.compose.runtime.remember
 import androidx.compose.ui.Modifier
-import androidx.compose.ui.draw.clip
-import androidx.compose.ui.res.stringResource
-import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.tooling.preview.PreviewParameter
-import androidx.compose.ui.unit.dp
-import io.element.android.compound.theme.ElementTheme
 import io.element.android.compound.tokens.generated.CompoundIcons
-import io.element.android.libraries.core.extensions.withBrackets
-import io.element.android.libraries.designsystem.modifiers.onKeyboardContextMenuAction
 import io.element.android.libraries.designsystem.preview.ElementPreview
 import io.element.android.libraries.designsystem.preview.PreviewsDayNight
-import io.element.android.libraries.designsystem.theme.components.HorizontalDivider
-import io.element.android.libraries.designsystem.theme.components.Icon
-import io.element.android.libraries.designsystem.theme.components.Text
+import io.element.android.libraries.matrix.ui.media.contentvalidation.ContentValidationValue
 import io.element.android.libraries.mediaviewer.impl.model.MediaItem
-import io.element.android.libraries.ui.strings.CommonStrings

@Composable
 fun AudioItemView(
    audio: MediaItem.Audio,
    onClick: () -> Unit,
    onLongClick: () -> Unit,
+    contentValidationValue: ContentValidationValue,
    modifier: Modifier = Modifier,
 ) {
-    Column(
-        modifier = modifier
-            .fillMaxWidth()
-            .padding(horizontal = 16.dp),
+    GalleryFileListItem(
+        modifier = modifier,
+        contentValidationValue = contentValidationValue,
+        caption = audio.mediaInfo.caption,
    ) {
-        Spacer(modifier = Modifier.height(20.dp))
-        FilenameRow(
-            audio = audio,
+        GalleryFileListItemContent(
+            name = audio.mediaInfo.filename,
+            formattedSize = audio.mediaInfo.formattedFileSize,
+            icon = CompoundIcons.Audio(),
+            isValidating = contentValidationValue.isLoading(),
            onClick = onClick,
            onLongClick = onLongClick,
        )
-        val caption = audio.mediaInfo.caption
-        if (caption != null) {
-            CaptionView(caption)
-        } else {
-            Spacer(modifier = Modifier.height(20.dp))
-        }
-        HorizontalDivider()
-    }
-}
-
-@Composable
-private fun FilenameRow(
-    audio: MediaItem.Audio,
-    onClick: () -> Unit,
-    onLongClick: () -> Unit,
-) {
-    Row(
-        modifier = Modifier
-            .clip(RoundedCornerShape(12.dp))
-            .background(
-                color = ElementTheme.colors.bgSubtleSecondary,
-                shape = RoundedCornerShape(12.dp),
-            )
-            .combinedClickable(
-                onClick = onClick,
-                onLongClick = onLongClick,
-                onLongClickLabel = stringResource(CommonStrings.action_open_context_menu),
-            )
-            .onKeyboardContextMenuAction(onLongClick)
-            .fillMaxWidth()
-            .padding(start = 12.dp, end = 36.dp, top = 8.dp, bottom = 8.dp),
-        verticalAlignment = Alignment.CenterVertically,
-    ) {
-        Icon(
-            modifier = Modifier
-                .background(
-                    color = ElementTheme.colors.bgActionSecondaryRest,
-                    shape = CircleShape,
-                )
-                .size(32.dp)
-                .padding(6.dp),
-            imageVector = CompoundIcons.Audio(),
-            contentDescription = null,
-        )
-        Spacer(modifier = Modifier.width(8.dp))
-        Text(
-            text = audio.mediaInfo.filename,
-            modifier = Modifier.weight(1f),
-            style = ElementTheme.typography.fontBodyLgRegular,
-            color = ElementTheme.colors.textPrimary,
-            maxLines = 1,
-            overflow = TextOverflow.Ellipsis,
-        )
-        val formattedSize = audio.mediaInfo.formattedFileSize
-        if (formattedSize.isNotEmpty()) {
-            Text(
-                text = formattedSize.withBrackets(),
-                style = ElementTheme.typography.fontBodyLgRegular,
-                color = ElementTheme.colors.textPrimary,
-            )
-        }
    }
 }

@@ -127,9 +48,22 @@ private fun FilenameRow(
 internal fun AudioItemViewPreview(
    @PreviewParameter(MediaItemAudioProvider::class) audio: MediaItem.Audio,
 ) = ElementPreview {
-    AudioItemView(
-        audio = audio,
-        onClick = {},
-        onLongClick = {},
-    )
+    val states = remember {
+        listOf(
+            ContentValidationValue.Valid,
+            ContentValidationValue.Loading,
+            ContentValidationValue.Invalid,
+            ContentValidationValue.UnrecoverableError(Throwable("Unrecoverable error")),
+        )
+    }
+    Column {
+        for (state in states) {
+            AudioItemView(
+                contentValidationValue = state,
+                audio = audio,
+                onClick = {},
+                onLongClick = {},
+            )
+        }
+    }
 }
@@ -8,117 +8,38 @@

 package io.element.android.libraries.mediaviewer.impl.gallery.ui

-import androidx.compose.foundation.background
-import androidx.compose.foundation.combinedClickable
 import androidx.compose.foundation.layout.Column
-import androidx.compose.foundation.layout.Row
-import androidx.compose.foundation.layout.Spacer
-import androidx.compose.foundation.layout.fillMaxWidth
-import androidx.compose.foundation.layout.height
-import androidx.compose.foundation.layout.padding
-import androidx.compose.foundation.layout.size
-import androidx.compose.foundation.layout.width
-import androidx.compose.foundation.shape.CircleShape
-import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.runtime.Composable
-import androidx.compose.ui.Alignment
+import androidx.compose.runtime.remember
 import androidx.compose.ui.Modifier
-import androidx.compose.ui.draw.clip
-import androidx.compose.ui.res.stringResource
-import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.tooling.preview.PreviewParameter
-import androidx.compose.ui.unit.dp
-import io.element.android.compound.theme.ElementTheme
 import io.element.android.compound.tokens.generated.CompoundIcons
-import io.element.android.libraries.core.extensions.withBrackets
-import io.element.android.libraries.designsystem.modifiers.onKeyboardContextMenuAction
 import io.element.android.libraries.designsystem.preview.ElementPreview
 import io.element.android.libraries.designsystem.preview.PreviewsDayNight
-import io.element.android.libraries.designsystem.theme.components.HorizontalDivider
-import io.element.android.libraries.designsystem.theme.components.Icon
-import io.element.android.libraries.designsystem.theme.components.Text
+import io.element.android.libraries.matrix.ui.media.contentvalidation.ContentValidationValue
 import io.element.android.libraries.mediaviewer.impl.model.MediaItem
-import io.element.android.libraries.ui.strings.CommonStrings

@Composable
 fun FileItemView(
    file: MediaItem.File,
    onClick: () -> Unit,
    onLongClick: () -> Unit,
+    contentValidationState: ContentValidationValue,
    modifier: Modifier = Modifier,
 ) {
-    Column(
-        modifier = modifier
-            .fillMaxWidth()
-            .padding(horizontal = 16.dp),
+    GalleryFileListItem(
+        modifier = modifier,
+        contentValidationValue = contentValidationState,
+        caption = file.mediaInfo.caption
    ) {
-        Spacer(modifier = Modifier.height(20.dp))
-        FilenameRow(
-            file = file,
+        GalleryFileListItemContent(
+            name = file.mediaInfo.filename,
+            formattedSize = file.mediaInfo.formattedFileSize,
+            icon = CompoundIcons.Attachment(),
            onClick = onClick,
+            isValidating = contentValidationState.isLoading(),
            onLongClick = onLongClick,
        )
-        val caption = file.mediaInfo.caption
-        if (caption != null) {
-            CaptionView(caption)
-        } else {
-            Spacer(modifier = Modifier.height(20.dp))
-        }
-        HorizontalDivider()
-    }
-}
-
-@Composable
-private fun FilenameRow(
-    file: MediaItem.File,
-    onClick: () -> Unit,
-    onLongClick: () -> Unit,
-) {
-    Row(
-        modifier = Modifier
-            .clip(RoundedCornerShape(12.dp))
-            .background(
-                color = ElementTheme.colors.bgSubtleSecondary,
-                shape = RoundedCornerShape(12.dp),
-            )
-            .combinedClickable(
-                onClick = onClick,
-                onLongClick = onLongClick,
-                onLongClickLabel = stringResource(CommonStrings.action_open_context_menu),
-            )
-            .onKeyboardContextMenuAction(onLongClick)
-            .fillMaxWidth()
-            .padding(start = 12.dp, end = 36.dp, top = 8.dp, bottom = 8.dp),
-        verticalAlignment = Alignment.CenterVertically,
-    ) {
-        Icon(
-            modifier = Modifier
-                .background(
-                    color = ElementTheme.colors.bgActionSecondaryRest,
-                    shape = CircleShape,
-                )
-                .size(32.dp)
-                .padding(6.dp),
-            imageVector = CompoundIcons.Attachment(),
-            contentDescription = null,
-        )
-        Spacer(modifier = Modifier.width(8.dp))
-        Text(
-            text = file.mediaInfo.filename,
-            modifier = Modifier.weight(1f),
-            style = ElementTheme.typography.fontBodyLgRegular,
-            color = ElementTheme.colors.textPrimary,
-            maxLines = 1,
-            overflow = TextOverflow.Ellipsis,
-        )
-        val formattedSize = file.mediaInfo.formattedFileSize
-        if (formattedSize.isNotEmpty()) {
-            Text(
-                text = formattedSize.withBrackets(),
-                style = ElementTheme.typography.fontBodyLgRegular,
-                color = ElementTheme.colors.textPrimary,
-            )
-        }
    }
 }

@@ -127,9 +48,22 @@ private fun FilenameRow(
 internal fun FileItemViewPreview(
    @PreviewParameter(MediaItemFileProvider::class) file: MediaItem.File,
 ) = ElementPreview {
-    FileItemView(
-        file = file,
-        onClick = {},
-        onLongClick = {},
-    )
+    val states = remember {
+        listOf(
+            ContentValidationValue.Valid,
+            ContentValidationValue.Loading,
+            ContentValidationValue.Invalid,
+            ContentValidationValue.UnrecoverableError(Throwable("Unrecoverable error")),
+        )
+    }
+    Column {
+        for (state in states) {
+            FileItemView(
+                file = file,
+                onClick = {},
+                onLongClick = {},
+                contentValidationState = state,
+            )
+        }
+    }
 }
@@ -0,0 +1,152 @@
+/*
+ * Copyright (c) 2026 Element Creations Ltd.
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial.
+ * Please see LICENSE files in the repository root for full details.
+ */
+
+package io.element.android.libraries.mediaviewer.impl.gallery.ui
+
+import androidx.compose.foundation.background
+import androidx.compose.foundation.border
+import androidx.compose.foundation.combinedClickable
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.PaddingValues
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.layout.width
+import androidx.compose.foundation.shape.CircleShape
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.clip
+import androidx.compose.ui.graphics.vector.ImageVector
+import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.text.style.TextOverflow
+import androidx.compose.ui.unit.dp
+import io.element.android.compound.theme.ElementTheme
+import io.element.android.libraries.core.extensions.withBrackets
+import io.element.android.libraries.designsystem.modifiers.onKeyboardContextMenuAction
+import io.element.android.libraries.designsystem.theme.components.CircularProgressIndicator
+import io.element.android.libraries.designsystem.theme.components.HorizontalDivider
+import io.element.android.libraries.designsystem.theme.components.Icon
+import io.element.android.libraries.designsystem.theme.components.Text
+import io.element.android.libraries.matrix.ui.media.contentvalidation.ContentValidationValue
+import io.element.android.libraries.matrix.ui.media.contentvalidation.InvalidContentView
+import io.element.android.libraries.matrix.ui.media.contentvalidation.NotFoundContentView
+import io.element.android.libraries.ui.strings.CommonStrings
+
+@Composable
+internal fun GalleryFileListItem(
+    contentValidationValue: ContentValidationValue,
+    caption: String?,
+    modifier: Modifier = Modifier,
+    content: @Composable () -> Unit,
+) {
+    Column(
+        modifier = modifier
+            .fillMaxWidth()
+            .padding(horizontal = 16.dp),
+    ) {
+        Spacer(modifier = Modifier.height(20.dp))
+
+        when (contentValidationValue) {
+            ContentValidationValue.Invalid -> InvalidContentView(
+                modifier = invalidContentModifier(),
+                contentPadding = PaddingValues(horizontal = 12.dp, vertical = 8.dp),
+            )
+            is ContentValidationValue.UnrecoverableError -> NotFoundContentView(
+                modifier = invalidContentModifier(),
+                contentPadding = PaddingValues(horizontal = 12.dp, vertical = 8.dp),
+            )
+            else -> {
+                content()
+            }
+        }
+
+        if (caption != null) {
+            CaptionView(caption)
+        } else {
+            Spacer(modifier = Modifier.height(20.dp))
+        }
+        HorizontalDivider()
+    }
+}
+
+@Composable
+private fun invalidContentModifier(): Modifier {
+    return Modifier
+        .border(width = 1.dp, color = ElementTheme.colors.borderCriticalSubtle, shape = RoundedCornerShape(12.dp))
+        .clip(RoundedCornerShape(12.dp))
+        .background(ElementTheme.colors.bgCriticalSubtle)
+}
+
+@Composable
+internal fun GalleryFileListItemContent(
+    name: String,
+    formattedSize: String,
+    icon: ImageVector,
+    isValidating: Boolean,
+    onClick: () -> Unit,
+    onLongClick: () -> Unit,
+) {
+    Row(
+        modifier = Modifier
+            .clip(RoundedCornerShape(12.dp))
+            .background(
+                color = ElementTheme.colors.bgSubtleSecondary,
+                shape = RoundedCornerShape(12.dp),
+            )
+            .combinedClickable(
+                onClick = onClick.takeIf { !isValidating } ?: {},
+                onLongClick = onLongClick.takeIf { !isValidating } ?: {},
+                onLongClickLabel = stringResource(CommonStrings.action_open_context_menu),
+            )
+            .onKeyboardContextMenuAction(onLongClick)
+            .fillMaxWidth()
+            .padding(start = 12.dp, end = 36.dp, top = 8.dp, bottom = 8.dp),
+        verticalAlignment = Alignment.CenterVertically,
+    ) {
+        val iconModifier = Modifier
+            .background(
+                color = ElementTheme.colors.bgActionSecondaryRest,
+                shape = CircleShape,
+            )
+            .size(32.dp)
+            .padding(6.dp)
+
+        if (isValidating) {
+            CircularProgressIndicator(
+                modifier = iconModifier,
+                strokeWidth = 2.dp,
+            )
+        } else {
+            Icon(
+                modifier = iconModifier,
+                imageVector = icon,
+                contentDescription = null,
+            )
+        }
+        Spacer(modifier = Modifier.width(8.dp))
+        Text(
+            text = name,
+            modifier = Modifier.weight(1f),
+            style = ElementTheme.typography.fontBodyLgRegular,
+            color = ElementTheme.colors.textPrimary,
+            maxLines = 1,
+            overflow = TextOverflow.Ellipsis,
+        )
+        if (formattedSize.isNotEmpty()) {
+            Text(
+                text = formattedSize.withBrackets(),
+                style = ElementTheme.typography.fontBodyLgRegular,
+                color = ElementTheme.colors.textPrimary,
+            )
+        }
+    }
+}
@@ -22,7 +22,7 @@ class MediaItemAudioProvider : PreviewParameterProvider<MediaItem.Audio> {
                caption = "A caption",
            ),
            aMediaItemAudio(
-                caption = loremIpsum,
+                caption = loremIpsum.take(80),
            ),
        )
 }
@@ -22,7 +22,7 @@ class MediaItemFileProvider : PreviewParameterProvider<MediaItem.File> {
                caption = "A caption",
            ),
            aMediaItemFile(
-                caption = loremIpsum,
+                caption = loremIpsum.take(80),
            ),
        )
 }
@@ -22,7 +22,7 @@ class MediaItemVoiceProvider : PreviewParameterProvider<MediaItem.Voice> {
                caption = "A caption",
            ),
            aMediaItemVoice(
-                caption = loremIpsum,
+                caption = loremIpsum.take(80),
            ),
            aMediaItemVoice(
                waveform = emptyList(),
@@ -45,10 +45,10 @@ import io.element.android.libraries.designsystem.modifiers.onKeyboardContextMenu
 import io.element.android.libraries.designsystem.preview.ElementPreview
 import io.element.android.libraries.designsystem.preview.PreviewsDayNight
 import io.element.android.libraries.designsystem.theme.components.CircularProgressIndicator
-import io.element.android.libraries.designsystem.theme.components.HorizontalDivider
 import io.element.android.libraries.designsystem.theme.components.Icon
 import io.element.android.libraries.designsystem.theme.components.IconButton
 import io.element.android.libraries.designsystem.theme.components.Text
+import io.element.android.libraries.matrix.ui.media.contentvalidation.ContentValidationValue
 import io.element.android.libraries.mediaviewer.impl.model.MediaItem
 import io.element.android.libraries.mediaviewer.impl.model.aMediaItemVoice
 import io.element.android.libraries.ui.strings.CommonStrings
@@ -64,26 +64,20 @@ fun VoiceItemView(
    state: VoiceMessageState,
    voice: MediaItem.Voice,
    onLongClick: () -> Unit,
+    contentValidationValue: ContentValidationValue,
    modifier: Modifier = Modifier,
 ) {
-    Column(
-        modifier = modifier
-            .fillMaxWidth()
-            .padding(horizontal = 16.dp),
+    GalleryFileListItem(
+        modifier = modifier,
+        contentValidationValue = contentValidationValue,
+        caption = voice.mediaInfo.caption,
    ) {
-        Spacer(modifier = Modifier.height(20.dp))
        VoiceInfoRow(
            state = state,
            voice = voice,
+            isValidating = contentValidationValue.isLoading(),
            onLongClick = onLongClick,
        )
-        val caption = voice.mediaInfo.caption
-        if (caption != null) {
-            CaptionView(caption)
-        } else {
-            Spacer(modifier = Modifier.height(16.dp))
-        }
-        HorizontalDivider()
    }
 }

@@ -91,6 +85,7 @@ fun VoiceItemView(
 private fun VoiceInfoRow(
    state: VoiceMessageState,
    voice: MediaItem.Voice,
+    isValidating: Boolean,
    onLongClick: () -> Unit,
 ) {
    fun playPause() {
@@ -114,12 +109,21 @@ private fun VoiceInfoRow(
            .padding(start = 12.dp, end = 36.dp, top = 8.dp, bottom = 8.dp),
        verticalAlignment = Alignment.CenterVertically,
    ) {
-        when (state.buttonType) {
-            VoiceMessageState.ButtonType.Play -> PlayButton(onClick = ::playPause)
-            VoiceMessageState.ButtonType.Pause -> PauseButton(onClick = ::playPause)
-            VoiceMessageState.ButtonType.Downloading -> ProgressButton()
-            VoiceMessageState.ButtonType.Retry -> RetryButton(onClick = ::playPause)
-            VoiceMessageState.ButtonType.Disabled -> PlayButton(onClick = {}, enabled = false)
+        if (isValidating) {
+            CustomIconButton(onClick = {}, enabled = false) {
+                CircularProgressIndicator(
+                    strokeWidth = 2.dp,
+                    modifier = Modifier.size(16.dp)
+                )
+            }
+        } else {
+            when (state.buttonType) {
+                VoiceMessageState.ButtonType.Play -> PlayButton(onClick = ::playPause)
+                VoiceMessageState.ButtonType.Pause -> PauseButton(onClick = ::playPause)
+                VoiceMessageState.ButtonType.Downloading -> ProgressButton()
+                VoiceMessageState.ButtonType.Retry -> RetryButton(onClick = ::playPause)
+                VoiceMessageState.ButtonType.Disabled -> PlayButton(onClick = {}, enabled = false)
+            }
        }
        Spacer(Modifier.width(8.dp))
        Column(
@@ -128,7 +132,7 @@ private fun VoiceInfoRow(
        ) {
            PlaybackSpeedButton(
                speed = state.playbackSpeed,
-                onClick = { state.eventSink(VoiceMessageEvent.ChangePlaybackSpeed) },
+                onClick = { state.eventSink(VoiceMessageEvent.ChangePlaybackSpeed) }.takeIf { !isValidating } ?: {},
            )
            Text(
                text = if (state.progress > 0f) state.time else voice.mediaInfo.duration ?: state.time,
@@ -149,7 +153,7 @@ private fun VoiceInfoRow(
            onSeek = {
                state.eventSink(VoiceMessageEvent.Seek(it))
            },
-            seekEnabled = true,
+            seekEnabled = !isValidating,
        )
    }
 }
@@ -277,11 +281,24 @@ private fun CustomIconButton(
 internal fun VoiceItemViewPreview(
    @PreviewParameter(MediaItemVoiceProvider::class) voice: MediaItem.Voice,
 ) = ElementPreview {
-    VoiceItemView(
-        state = aVoiceMessageState(),
-        voice = voice,
-        onLongClick = {},
-    )
+    val states = remember {
+        listOf(
+            ContentValidationValue.Valid,
+            ContentValidationValue.Loading,
+            ContentValidationValue.Invalid,
+            ContentValidationValue.UnrecoverableError(Throwable("Unrecoverable error")),
+        )
+    }
+    Column {
+        for (state in states) {
+            VoiceItemView(
+                state = aVoiceMessageState(),
+                voice = voice,
+                onLongClick = {},
+                contentValidationValue = state,
+            )
+        }
+    }
 }

@PreviewsDayNight
@@ -289,9 +306,22 @@ internal fun VoiceItemViewPreview(
 internal fun VoiceItemViewPlayPreview(
    @PreviewParameter(VoiceMessageStateProvider::class) state: VoiceMessageState,
 ) = ElementPreview {
-    VoiceItemView(
-        state = state,
-        voice = aMediaItemVoice(),
-        onLongClick = {},
-    )
+    val validationState = remember {
+        listOf(
+            ContentValidationValue.Valid,
+            ContentValidationValue.Loading,
+            ContentValidationValue.Invalid,
+            ContentValidationValue.UnrecoverableError(Throwable("Unrecoverable error")),
+        )
+    }
+    Column {
+        for (validationState in validationState) {
+            VoiceItemView(
+                state = state,
+                voice = aMediaItemVoice(),
+                onLongClick = {},
+                contentValidationValue = validationState,
+            )
+        }
+    }
 }
@@ -254,29 +254,31 @@ private fun ExoPlayerMediaVideoView(
                },
            )
        }
-        MediaPlayerControllerView(
-            state = mediaPlayerControllerState,
-            onTogglePlay = {
-                autoHideController++
-                exoPlayer.togglePlay()
-            },
-            onSeekChange = {
-                autoHideController++
-                mediaPlayerControllerState = mediaPlayerControllerState.copy(
-                    seekingToMillis = it.toLong(),
-                )
-                exoPlayer.seekToEnsurePlaying(it.toLong())
-            },
-            onToggleMute = {
-                autoHideController++
-                exoPlayer.volume = if (exoPlayer.volume == 1f) 0f else 1f
-            },
-            audioFocus = audioFocus,
-            modifier = Modifier
-                .fillMaxWidth()
-                .align(Alignment.BottomCenter)
-                .padding(bottom = bottomPaddingInPixels.toDp()),
-        )
+        if (localMedia != null) {
+            MediaPlayerControllerView(
+                state = mediaPlayerControllerState,
+                onTogglePlay = {
+                    autoHideController++
+                    exoPlayer.togglePlay()
+                },
+                onSeekChange = {
+                    autoHideController++
+                    mediaPlayerControllerState = mediaPlayerControllerState.copy(
+                        seekingToMillis = it.toLong(),
+                    )
+                    exoPlayer.seekToEnsurePlaying(it.toLong())
+                },
+                onToggleMute = {
+                    autoHideController++
+                    exoPlayer.volume = if (exoPlayer.volume == 1f) 0f else 1f
+                },
+                audioFocus = audioFocus,
+                modifier = Modifier
+                    .fillMaxWidth()
+                    .align(Alignment.BottomCenter)
+                    .padding(bottom = bottomPaddingInPixels.toDp()),
+            )
+        }
    }

    LaunchedEffect(exoPlayer.isPlaying) {
@@ -13,6 +13,8 @@ import io.element.android.libraries.matrix.api.core.UniqueId
 import io.element.android.libraries.matrix.api.media.MediaSource
 import io.element.android.libraries.matrix.api.timeline.Timeline
 import io.element.android.libraries.matrix.ui.media.MediaRequestData
+import io.element.android.libraries.matrix.ui.media.contentvalidation.ContentValidationState
+import io.element.android.libraries.matrix.ui.media.contentvalidation.ContentValidationValue
 import io.element.android.libraries.mediaviewer.api.MediaInfo

 sealed interface MediaItem {
@@ -27,7 +29,9 @@ sealed interface MediaItem {
        val timestamp: Long,
    ) : MediaItem

-    sealed interface Event : MediaItem
+    sealed interface Event : MediaItem {
+        val validationState: ContentValidationState
+    }

    data class Image(
        val id: UniqueId,
@@ -36,6 +40,7 @@ sealed interface MediaItem {
        val mediaSource: MediaSource,
        val thumbnailSource: MediaSource?,
        val blurHash: String?,
+        override val validationState: ContentValidationState,
    ) : Event {
        val thumbnailMediaRequestData: MediaRequestData
            get() = MediaRequestData(thumbnailSource ?: mediaSource, MediaRequestData.Kind.Thumbnail(100))
@@ -48,6 +53,7 @@ sealed interface MediaItem {
        val mediaSource: MediaSource,
        val thumbnailSource: MediaSource?,
        val blurHash: String?,
+        override val validationState: ContentValidationState,
    ) : Event {
        val thumbnailMediaRequestData: MediaRequestData
            get() = MediaRequestData(thumbnailSource ?: mediaSource, MediaRequestData.Kind.Thumbnail(100))
@@ -58,6 +64,7 @@ sealed interface MediaItem {
        val eventId: EventId?,
        val mediaInfo: MediaInfo,
        val mediaSource: MediaSource,
+        override val validationState: ContentValidationState,
    ) : Event

    data class Voice(
@@ -65,6 +72,7 @@ sealed interface MediaItem {
        val eventId: EventId?,
        val mediaInfo: MediaInfo,
        val mediaSource: MediaSource,
+        override val validationState: ContentValidationState,
    ) : Event

    data class File(
@@ -72,6 +80,7 @@ sealed interface MediaItem {
        val eventId: EventId?,
        val mediaInfo: MediaInfo,
        val mediaSource: MediaSource,
+        override val validationState: ContentValidationState,
    ) : Event
 }

@@ -134,3 +143,8 @@ fun MediaItem.Event.blurHash(): String? {
        else -> null
    }
 }
+
+fun MediaItem.isMediaValid(): Boolean? = when (this) {
+    is MediaItem.Event -> validationState.getCurrentOverallState() == ContentValidationValue.Valid
+    else -> null
+}
@@ -14,6 +14,8 @@ import io.element.android.libraries.matrix.api.core.UniqueId
 import io.element.android.libraries.matrix.api.core.UserId
 import io.element.android.libraries.matrix.api.media.MediaSource
 import io.element.android.libraries.matrix.api.timeline.Timeline
+import io.element.android.libraries.matrix.ui.media.contentvalidation.ContentValidationState
+import io.element.android.libraries.matrix.ui.media.contentvalidation.NoopContentValidationState
 import io.element.android.libraries.mediaviewer.api.aPdfMediaInfo
 import io.element.android.libraries.mediaviewer.api.aVideoMediaInfo
 import io.element.android.libraries.mediaviewer.api.aVoiceMediaInfo
@@ -25,6 +27,8 @@ fun aMediaItemImage(
    eventId: EventId? = null,
    senderId: UserId? = null,
    mediaSourceUrl: String = "",
+    validationState: ContentValidationState = NoopContentValidationState(),
+    blurHash: String? = null,
 ): MediaItem.Image {
    return MediaItem.Image(
        id = id,
@@ -34,7 +38,8 @@ fun aMediaItemImage(
        ),
        mediaSource = MediaSource(mediaSourceUrl),
        thumbnailSource = null,
-        blurHash = null,
+        blurHash = blurHash,
+        validationState = validationState,
    )
 }

@@ -42,6 +47,7 @@ fun aMediaItemVideo(
    id: UniqueId = UniqueId("videoId"),
    mediaSource: MediaSource = MediaSource(""),
    duration: String? = "1:23",
+    validationState: ContentValidationState = NoopContentValidationState(),
 ): MediaItem.Video {
    return MediaItem.Video(
        id = id,
@@ -52,6 +58,7 @@ fun aMediaItemVideo(
        mediaSource = mediaSource,
        thumbnailSource = null,
        blurHash = null,
+        validationState = validationState,
    )
 }

@@ -60,6 +67,7 @@ fun aMediaItemFile(
    eventId: EventId? = null,
    filename: String = "filename",
    caption: String? = null,
+    validationState: ContentValidationState = NoopContentValidationState(),
 ): MediaItem.File {
    return MediaItem.File(
        id = id,
@@ -69,6 +77,7 @@ fun aMediaItemFile(
            caption = caption,
        ),
        mediaSource = MediaSource(""),
+        validationState = validationState,
    )
 }

@@ -77,6 +86,7 @@ fun aMediaItemAudio(
    eventId: EventId? = null,
    filename: String = "filename",
    caption: String? = null,
+    validationState: ContentValidationState = NoopContentValidationState(),
 ): MediaItem.Audio {
    return MediaItem.Audio(
        id = id,
@@ -86,6 +96,7 @@ fun aMediaItemAudio(
            caption = caption,
        ),
        mediaSource = MediaSource(""),
+        validationState = validationState,
    )
 }

@@ -95,6 +106,7 @@ fun aMediaItemVoice(
    caption: String? = null,
    duration: String? = "1:23",
    waveform: List<Float> = WaveFormSamples.realisticWaveForm,
+    validationState: ContentValidationState = NoopContentValidationState(),
 ): MediaItem.Voice {
    return MediaItem.Voice(
        id = id,
@@ -106,6 +118,7 @@ fun aMediaItemVoice(
            waveForm = waveform,
        ),
        mediaSource = MediaSource(""),
+        validationState = validationState,
    )
 }

@@ -11,6 +11,7 @@ import io.element.android.libraries.architecture.AsyncData
 import io.element.android.libraries.matrix.api.core.EventId
 import io.element.android.libraries.matrix.api.core.UniqueId
 import io.element.android.libraries.matrix.api.timeline.Timeline
+import io.element.android.libraries.matrix.ui.media.contentvalidation.ContentValidationState
 import io.element.android.libraries.mediaviewer.api.GalleryInfo
 import io.element.android.libraries.mediaviewer.api.GalleryItemData
 import io.element.android.libraries.mediaviewer.api.MediaInfo
@@ -37,6 +38,7 @@ class GalleryMediaGalleryDataSource(
            eventId: EventId?,
            galleryItems: List<GalleryItemData>,
            galleryInfo: GalleryInfo,
+            contentValidationState: ContentValidationState,
        ): GalleryMediaGalleryDataSource {
            val mixedItems = mutableListOf<MediaItem.Event>()
            galleryItems.forEachIndexed { index, galleryItem ->
@@ -64,18 +66,21 @@ class GalleryMediaGalleryDataSource(
                        mediaSource = galleryItem.mediaSource,
                        thumbnailSource = galleryItem.thumbnailSource,
                        blurHash = galleryItem.blurHash,
+                        validationState = contentValidationState,
                    )
                    GalleryItemData.Type.Audio -> MediaItem.Audio(
                        id = id,
                        eventId = eventId,
                        mediaInfo = itemMediaInfo,
                        mediaSource = galleryItem.mediaSource,
+                        validationState = contentValidationState,
                    )
                    GalleryItemData.Type.File -> MediaItem.File(
                        id = id,
                        eventId = eventId,
                        mediaInfo = itemMediaInfo,
                        mediaSource = galleryItem.mediaSource,
+                        validationState = contentValidationState,
                    )
                    GalleryItemData.Type.Image -> MediaItem.Image(
                        id = id,
@@ -84,6 +89,7 @@ class GalleryMediaGalleryDataSource(
                        mediaSource = galleryItem.mediaSource,
                        thumbnailSource = galleryItem.thumbnailSource,
                        blurHash = galleryItem.blurHash,
+                        validationState = contentValidationState,
                    )
                }
                mixedItems.add(mediaItem)
@@ -17,6 +17,7 @@ import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.produceState
 import androidx.compose.runtime.rememberUpdatedState
+import io.element.android.features.contentscanner.api.ContentScannerService
 import io.element.android.libraries.architecture.AsyncData
 import io.element.android.libraries.core.extensions.mapCatchingExceptions
 import io.element.android.libraries.matrix.api.core.EventId
@@ -24,6 +25,9 @@ import io.element.android.libraries.matrix.api.media.MatrixMediaLoader
 import io.element.android.libraries.matrix.api.media.MediaFile
 import io.element.android.libraries.matrix.api.media.MediaSource
 import io.element.android.libraries.matrix.api.timeline.Timeline
+import io.element.android.libraries.matrix.ui.media.contentvalidation.ContentValidationState
+import io.element.android.libraries.matrix.ui.media.contentvalidation.DefaultContentValidationState
+import io.element.android.libraries.matrix.ui.media.contentvalidation.EventContentValidationCache
 import io.element.android.libraries.mediaviewer.api.MediaViewerEntryPoint.MediaViewerMode
 import io.element.android.libraries.mediaviewer.api.local.LocalMedia
 import io.element.android.libraries.mediaviewer.api.local.LocalMediaFactory
@@ -57,6 +61,8 @@ class MediaViewerDataSource(
    private val localMediaFactory: LocalMediaFactory,
    private val systemClock: SystemClock,
    private val pagerKeysHandler: PagerKeysHandler,
+    private val contentScannerService: ContentScannerService,
+    private val contentValidationCache: EventContentValidationCache,
 ) {
    // List of media files that are currently being loaded
    private val mediaFiles: ConcurrentHashMap<MediaSource, MediaFile> = ConcurrentHashMap()
@@ -71,6 +77,9 @@ class MediaViewerDataSource(
    private val localMediaStates: MutableMap<String, MutableState<AsyncData<LocalMedia>>> =
        mutableMapOf()

+    private val mediaValidationState: MutableMap<String, ContentValidationState> =
+        mutableMapOf()
+
    fun setup(coroutineScope: CoroutineScope) {
        galleryDataSource.start(coroutineScope)
    }
@@ -162,6 +171,9 @@ class MediaViewerDataSource(
                    val localMedia = localMediaStates.getOrPut(sourceUrl) {
                        mutableStateOf(AsyncData.Uninitialized)
                    }
+                    val validationState = mediaValidationState.getOrPut(sourceUrl) {
+                        mediaItem.eventId()?.let { contentValidationCache[it] } ?: DefaultContentValidationState()
+                    }
                    add(
                        MediaViewerPageData.MediaViewerData(
                            eventId = mediaItem.eventId(),
@@ -170,6 +182,7 @@ class MediaViewerDataSource(
                            thumbnailSource = mediaItem.thumbnailSource(),
                            downloadedMedia = localMedia,
                            pagerKey = pagerKeysHandler.getKey(mediaItem),
+                            validationState = validationState,
                        )
                    )
                }
@@ -229,6 +242,20 @@ class MediaViewerDataSource(
            }
    }

+    fun validateMedia(
+        eventId: EventId,
+        mediaSource: MediaSource,
+    ) {
+        val validationState = mediaValidationState[mediaSource.safeUrl] ?: return
+        val currentState = validationState.getCurrentMediaState(mediaSource.safeUrl)
+
+        if (currentState.isLoading() || currentState.isValid()) {
+            return
+        }
+
+        contentScannerService.scan(eventId, listOf(mediaSource), validationState)
+    }
+
    fun cancelLoadingMedia(data: MediaViewerPageData.MediaViewerData) {
        if (localMediaStates[data.mediaSource.safeUrl]?.value?.isLoading() == true) {
            Timber.d("cancelLoadingMedia for ${data.eventId}")
@@ -9,6 +9,7 @@
 package io.element.android.libraries.mediaviewer.impl.viewer

 import io.element.android.libraries.matrix.api.core.EventId
+import io.element.android.libraries.matrix.api.media.MediaSource
 import io.element.android.libraries.matrix.api.timeline.Timeline

 sealed interface MediaViewerEvent {
@@ -30,4 +31,5 @@ sealed interface MediaViewerEvent {
    data class OnNavigateTo(val index: Int) : MediaViewerEvent
    data class LoadMore(val direction: Timeline.PaginationDirection) : MediaViewerEvent
    data class CancelLoadingMedia(val data: MediaViewerPageData.MediaViewerData) : MediaViewerEvent
+    data class ValidateMedia(val eventId: EventId, val mediaSource: MediaSource) : MediaViewerEvent
 }
@@ -22,6 +22,7 @@ import dev.zacsweers.metro.AssistedInject
 import io.element.android.annotations.ContributesNode
 import io.element.android.compound.colors.SemanticColorsLightDark
 import io.element.android.compound.theme.ForcedDarkElementTheme
+import io.element.android.features.contentscanner.api.ContentScannerService
 import io.element.android.features.enterprise.api.EnterpriseService
 import io.element.android.features.viewfolder.api.TextFileViewer
 import io.element.android.libraries.architecture.callback
@@ -33,6 +34,8 @@ import io.element.android.libraries.matrix.api.core.EventId
 import io.element.android.libraries.matrix.api.core.SessionId
 import io.element.android.libraries.matrix.api.media.MatrixMediaLoader
 import io.element.android.libraries.matrix.api.timeline.Timeline
+import io.element.android.libraries.matrix.ui.media.contentvalidation.EventContentValidationCache
+import io.element.android.libraries.matrix.ui.media.contentvalidation.NoopContentValidationState
 import io.element.android.libraries.mediaviewer.api.MediaViewerEntryPoint
 import io.element.android.libraries.mediaviewer.api.local.LocalMediaFactory
 import io.element.android.libraries.mediaviewer.impl.datasource.FocusedTimelineMediaGalleryDataSourceFactory
@@ -57,6 +60,8 @@ class MediaViewerNode(
    private val audioFocus: AudioFocus,
    private val sessionId: SessionId,
    private val enterpriseService: EnterpriseService,
+    private val contentScannerService: ContentScannerService,
+    private val contentValidationCache: EventContentValidationCache,
 ) : Node(buildContext, plugins = plugins),
    MediaViewerNavigator {
    private val callback: MediaViewerEntryPoint.Callback = callback()
@@ -76,12 +81,13 @@ class MediaViewerNode(

    private val mediaGallerySource = when (inputs) {
        is MediaViewerEntryPoint.Params.Avatar ->
-            SingleMediaGalleryDataSource.createFrom(inputs)
+            SingleMediaGalleryDataSource.createFrom(inputs, contentValidationCache)
        is MediaViewerEntryPoint.Params.EventGallery ->
            GalleryMediaGalleryDataSource.createFrom(
                eventId = inputs.eventId,
                galleryItems = inputs.galleryItems,
                galleryInfo = inputs.galleryInfo,
+                contentValidationState = inputs.eventId?.let { contentValidationCache[it] } ?: NoopContentValidationState(),
            )
        is MediaViewerEntryPoint.Params.RoomMedia -> {
            val eventId = inputs.eventId
@@ -103,7 +109,7 @@ class MediaViewerNode(
                        } else {
                            focusedTimelineMediaGalleryDataSourceFactory.createFor(
                                eventId = eventId,
-                                mediaItem = inputs.toMediaItem(),
+                                mediaItem = inputs.toMediaItem(contentValidationCache[eventId]),
                                onlyPinnedEvents = false,
                            )
                        }
@@ -111,7 +117,7 @@ class MediaViewerNode(
                    Timeline.Mode.PinnedEvents -> {
                        focusedTimelineMediaGalleryDataSourceFactory.createFor(
                            eventId = eventId,
-                            mediaItem = inputs.toMediaItem(),
+                            mediaItem = inputs.toMediaItem(contentValidationCache[eventId]),
                            onlyPinnedEvents = true,
                        )
                    }
@@ -142,6 +148,8 @@ class MediaViewerNode(
            localMediaFactory = localMediaFactory,
            systemClock = systemClock,
            pagerKeysHandler = pagerKeysHandler,
+            contentScannerService = contentScannerService,
+            contentValidationCache = contentValidationCache,
        )
    )

@@ -42,7 +42,9 @@ import io.element.android.libraries.mediaviewer.impl.model.MediaPermissions
 import io.element.android.libraries.mediaviewer.impl.model.mediaPermissions
 import io.element.android.libraries.ui.strings.CommonStrings
 import kotlinx.collections.immutable.ImmutableList
+import kotlinx.collections.immutable.toImmutableList
 import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.ExperimentalCoroutinesApi
 import kotlinx.coroutines.flow.collectLatest
 import kotlinx.coroutines.launch
 import io.element.android.libraries.androidutils.R as UtilsR
@@ -70,6 +72,7 @@ class MediaViewerPresenter(
    private val eventId = inputs.eventId()
    private val mediaSource = inputs.mediaSource()

+    @OptIn(ExperimentalCoroutinesApi::class)
    @Composable
    override fun present(): MediaViewerState {
        val coroutineScope = rememberCoroutineScope()
@@ -93,7 +96,7 @@ class MediaViewerPresenter(
                    // Restore index based on the eventId after the initial items have been loaded
                    currentIndex.intValue = dataSource.findEventIndex(eventId, mediaSource) ?: 0
                }
-                value = new
+                value = new.toImmutableList()
            }
        }

@@ -191,6 +194,7 @@ class MediaViewerPresenter(
                is MediaViewerEvent.LoadMore -> coroutineScope.launch {
                    dataSource.loadMore(event.direction)
                }
+                is MediaViewerEvent.ValidateMedia -> dataSource.validateMedia(event.eventId, event.mediaSource)
            }
        }

@@ -15,6 +15,7 @@ import io.element.android.libraries.designsystem.utils.snackbar.SnackbarMessage
 import io.element.android.libraries.matrix.api.core.EventId
 import io.element.android.libraries.matrix.api.media.MediaSource
 import io.element.android.libraries.matrix.api.timeline.Timeline
+import io.element.android.libraries.matrix.ui.media.contentvalidation.ContentValidationState
 import io.element.android.libraries.mediaviewer.api.MediaInfo
 import io.element.android.libraries.mediaviewer.api.local.LocalMedia
 import io.element.android.libraries.mediaviewer.impl.details.MediaBottomSheetState
@@ -51,6 +52,7 @@ sealed interface MediaViewerPageData {
        val mediaSource: MediaSource,
        val thumbnailSource: MediaSource?,
        val downloadedMedia: State<AsyncData<LocalMedia>>,
+        val validationState: ContentValidationState,
        override val pagerKey: Long,
    ) : MediaViewerPageData
 }
@@ -17,6 +17,9 @@ import io.element.android.libraries.designsystem.preview.USER_NAME_ALICE
 import io.element.android.libraries.matrix.api.core.EventId
 import io.element.android.libraries.matrix.api.media.MediaSource
 import io.element.android.libraries.matrix.api.timeline.Timeline
+import io.element.android.libraries.matrix.ui.media.contentvalidation.ContentValidationState
+import io.element.android.libraries.matrix.ui.media.contentvalidation.ContentValidationValue
+import io.element.android.libraries.matrix.ui.media.contentvalidation.NoopContentValidationState
 import io.element.android.libraries.mediaviewer.api.MediaInfo
 import io.element.android.libraries.mediaviewer.api.aPdfMediaInfo
 import io.element.android.libraries.mediaviewer.api.aTxtMediaInfo
@@ -275,6 +278,34 @@ open class MediaViewerStateProvider : PreviewParameterProvider<MediaViewerState>
                    )
                )
            },
+            anImageMediaInfo(
+                senderName = "Frank",
+                dateSent = "26 NOV, 2024",
+            ).let {
+                aMediaViewerState(
+                    listOf(
+                        aMediaViewerPageData(
+                            downloadedMedia = AsyncData.Uninitialized,
+                            validationState = NoopContentValidationState(ContentValidationValue.Loading),
+                            mediaInfo = it,
+                        )
+                    )
+                )
+            },
+            anImageMediaInfo(
+                senderName = "Frank",
+                dateSent = "26 NOV, 2024",
+            ).let {
+                aMediaViewerState(
+                    listOf(
+                        aMediaViewerPageData(
+                            downloadedMedia = AsyncData.Uninitialized,
+                            validationState = NoopContentValidationState(ContentValidationValue.Invalid),
+                            mediaInfo = it,
+                        )
+                    )
+                )
+            },
        )
 }

@@ -293,6 +324,7 @@ fun aMediaViewerPageData(
    downloadedMedia: AsyncData<LocalMedia> = AsyncData.Uninitialized,
    mediaInfo: MediaInfo = anImageMediaInfo(),
    mediaSource: MediaSource = MediaSource(""),
+    validationState: ContentValidationState = NoopContentValidationState(),
 ): MediaViewerPageData.MediaViewerData = MediaViewerPageData.MediaViewerData(
    eventId = null,
    mediaInfo = mediaInfo,
@@ -300,6 +332,7 @@ fun aMediaViewerPageData(
    thumbnailSource = null,
    downloadedMedia = mutableStateOf(downloadedMedia),
    pagerKey = 0L,
+    validationState = validationState,
 )

 fun aMediaViewerState(
@@ -12,11 +12,14 @@ package io.element.android.libraries.mediaviewer.impl.viewer

 import androidx.activity.compose.BackHandler
 import androidx.compose.animation.AnimatedVisibility
+import androidx.compose.animation.core.spring
 import androidx.compose.animation.fadeIn
 import androidx.compose.animation.fadeOut
 import androidx.compose.foundation.background
+import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.PaddingValues
 import androidx.compose.foundation.layout.WindowInsets
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.fillMaxWidth
@@ -73,7 +76,10 @@ import io.element.android.libraries.androidutils.text.safeLinkify
 import io.element.android.libraries.architecture.AsyncData
 import io.element.android.libraries.audio.api.AudioFocus
 import io.element.android.libraries.core.mimetype.MimeTypes.isMimeTypeVideo
+import io.element.android.libraries.designsystem.atomic.molecules.IconTitleSubtitleMolecule
+import io.element.android.libraries.designsystem.components.BigIcon
 import io.element.android.libraries.designsystem.components.async.AsyncFailure
+import io.element.android.libraries.designsystem.components.async.AsyncIndicator
 import io.element.android.libraries.designsystem.components.async.AsyncLoading
 import io.element.android.libraries.designsystem.components.button.BackButton
 import io.element.android.libraries.designsystem.components.dialogs.RetryDialog
@@ -176,7 +182,7 @@ fun MediaViewerView(
            }
        },
        snackbarHost = { SnackbarHost(snackbarHostState) },
-    ) {
+    ) { padding ->
        val pagerState = rememberPagerState(state.currentIndex, 0f) {
            state.listData.size
        }
@@ -211,17 +217,33 @@ fun MediaViewerView(
                    )
                }
                is MediaViewerPageData.MediaViewerData -> {
+                    val eventId = dataForPage.eventId
+
+                    val isMediaValid = dataForPage.validationState.getCurrentMediaState(dataForPage.mediaSource.safeUrl).isValid()
+
+                    // Check if the media to display is valid or dangerous
+                    LaunchedEffect(eventId) {
+                        if (eventId != null) {
+                            state.eventSink(MediaViewerEvent.ValidateMedia(eventId, dataForPage.mediaSource))
+                        }
+                    }
+
                    var bottomPaddingInPixels by remember { mutableIntStateOf(defaultBottomPaddingInPixels) }
-                    Box(
-                        modifier = Modifier
-                            .onVisibilityChanged(minDurationMs = 200L) { isVisible ->
+                    val loadMediaOnVisibilityChangedModifier = remember(isMediaValid) {
+                        if (isMediaValid == true) {
+                            Modifier.onVisibilityChanged(minDurationMs = 200L) { isVisible ->
                                if (isVisible) {
                                    state.eventSink(MediaViewerEvent.LoadMedia(dataForPage))
                                } else {
                                    state.eventSink(MediaViewerEvent.CancelLoadingMedia(dataForPage))
                                }
                            }
-                            .fillMaxSize()
+                        } else {
+                            Modifier
+                        }
+                    }
+                    Box(
+                        modifier = loadMediaOnVisibilityChangedModifier.fillMaxSize()
                    ) {
                        val isDisplayed = remember(pagerState.settledPage) {
                            // This 'item provider' lambda will be called when the data source changes with an outdated `settlePage` value
@@ -232,6 +254,7 @@ fun MediaViewerView(
                        MediaViewerPage(
                            isDisplayed = isDisplayed,
                            showOverlay = showOverlay,
+                            containerPadding = padding,
                            bottomPaddingInPixels = (bottomPaddingInPixels - navigationBarPadding).coerceAtLeast(0),
                            data = dataForPage,
                            textFileViewer = textFileViewer,
@@ -333,6 +356,7 @@ private fun MediaViewerPage(
    isDisplayed: Boolean,
    showOverlay: Boolean,
    bottomPaddingInPixels: Int,
+    containerPadding: PaddingValues,
    data: MediaViewerPageData.MediaViewerData,
    textFileViewer: TextFileViewer,
    isUserSelected: Boolean,
@@ -365,6 +389,25 @@ private fun MediaViewerPage(
                .fillMaxSize()
                .navigationBarsPadding()
        ) {
+            AnimatedVisibility(
+                visible = data.validationState.getCurrentMediaState(data.mediaSource.safeUrl).isLoading(),
+                modifier = Modifier.padding(top = containerPadding.calculateTopPadding()).align(Alignment.TopCenter),
+                enter = fadeIn(spring(stiffness = 500F)),
+                exit = fadeOut(spring(stiffness = 500F)),
+            ) {
+                AsyncIndicator.Loading(
+                    text = stringResource(CommonStrings.content_scanner_scanning),
+                )
+            }
+
+            if (showProgress) {
+                LinearProgressIndicator(
+                    modifier = Modifier
+                        .fillMaxWidth()
+                        .height(2.dp)
+                )
+            }
+
            Box(contentAlignment = Alignment.Center) {
                val zoomableState = rememberZoomableState(
                    zoomSpec = ZoomSpec(maxZoomFactor = 4f, overzoomEffect = OverzoomEffect.NoLimits)
@@ -380,29 +423,44 @@ private fun MediaViewerPage(
                    }
                }

-                LocalMediaView(
-                    modifier = Modifier.fillMaxSize(),
-                    isDisplayed = isDisplayed,
-                    bottomPaddingInPixels = bottomPaddingInPixels,
-                    localMediaViewState = localMediaViewState,
-                    localMedia = downloadedMedia.dataOrNull(),
-                    mediaInfo = data.mediaInfo,
-                    textFileViewer = textFileViewer,
-                    onClick = {
-                        if (playableState is PlayableState.NotPlayable) {
-                            currentOnShowOverlayChange(!currentShowOverlay)
-                        }
-                    },
-                    onOpenWith = onOpenWith,
-                    isUserSelected = isUserSelected,
-                    audioFocus = audioFocus,
-                    forPreview = false,
-                )
-                if (showThumbnail) {
-                    ThumbnailView(
+                val isMediaValid = data.validationState.getCurrentMediaState(data.mediaSource.safeUrl).isValid()
+
+                if (isMediaValid == false) {
+                    Column(
+                        modifier = Modifier.fillMaxSize(),
+                        verticalArrangement = Arrangement.Center,
+                    ) {
+                        IconTitleSubtitleMolecule(
+                            iconStyle = BigIcon.Style.AlertSolid,
+                            title = "The file is not safe",
+                            subTitle = "Preview and download have been disabled.",
+                        )
+                    }
+                } else {
+                    LocalMediaView(
+                        modifier = Modifier.fillMaxSize(),
+                        isDisplayed = isDisplayed,
+                        bottomPaddingInPixels = bottomPaddingInPixels,
+                        localMediaViewState = localMediaViewState,
+                        localMedia = downloadedMedia.dataOrNull(),
                        mediaInfo = data.mediaInfo,
-                        thumbnailSource = data.thumbnailSource,
+                        textFileViewer = textFileViewer,
+                        onClick = {
+                            if (playableState is PlayableState.NotPlayable) {
+                                currentOnShowOverlayChange(!currentShowOverlay)
+                            }
+                        },
+                        onOpenWith = onOpenWith,
+                        isUserSelected = isUserSelected,
+                        audioFocus = audioFocus,
+                        forPreview = false,
                    )
+                    if (showThumbnail) {
+                        ThumbnailView(
+                            mediaInfo = data.mediaInfo,
+                            thumbnailSource = data.thumbnailSource,
+                        )
+                    }
                }
                if (showError) {
                    ErrorView(
@@ -412,13 +470,6 @@ private fun MediaViewerPage(
                    )
                }
            }
-            if (showProgress) {
-                LinearProgressIndicator(
-                    modifier = Modifier
-                        .fillMaxWidth()
-                        .height(2.dp)
-                )
-            }
        }
    }
 }
@@ -16,6 +16,9 @@ import io.element.android.libraries.core.mimetype.MimeTypes.isMimeTypeVideo
 import io.element.android.libraries.matrix.api.core.EventId
 import io.element.android.libraries.matrix.api.core.UniqueId
 import io.element.android.libraries.matrix.api.timeline.Timeline
+import io.element.android.libraries.matrix.ui.media.contentvalidation.ContentValidationState
+import io.element.android.libraries.matrix.ui.media.contentvalidation.DefaultContentValidationState
+import io.element.android.libraries.matrix.ui.media.contentvalidation.EventContentValidationCache
 import io.element.android.libraries.mediaviewer.api.MediaInfo
 import io.element.android.libraries.mediaviewer.api.MediaViewerEntryPoint
 import io.element.android.libraries.mediaviewer.impl.datasource.MediaGalleryDataSource
@@ -27,6 +30,7 @@ import kotlinx.coroutines.flow.flowOf

 class SingleMediaGalleryDataSource(
    private val data: GroupedMediaItems,
+    private val contentValidationCache: EventContentValidationCache,
 ) : MediaGalleryDataSource {
    override fun start(coroutineScope: CoroutineScope) = Unit
    override fun groupedMediaItemsFlow() = flowOf(AsyncData.Success(data))
@@ -38,7 +42,10 @@ class SingleMediaGalleryDataSource(
    override suspend fun deleteItem(eventId: EventId) = Unit

    companion object {
-        fun createFrom(params: MediaViewerEntryPoint.Params.Avatar) = SingleMediaGalleryDataSource(
+        fun createFrom(
+            params: MediaViewerEntryPoint.Params.Avatar,
+            contentValidationCache: EventContentValidationCache,
+        ) = SingleMediaGalleryDataSource(
            data = GroupedMediaItems(
                // Always use imageAndVideoItems, in Single mode, this is the data that will be used
                imageAndVideoItems = persistentListOf(
@@ -64,15 +71,19 @@ class SingleMediaGalleryDataSource(
                        mediaSource = params.mediaSource,
                        thumbnailSource = params.thumbnailSource,
                        blurHash = params.blurHash,
+                        validationState = DefaultContentValidationState(),
                    )
                ),
                fileItems = persistentListOf(),
-            )
+            ),
+            contentValidationCache = contentValidationCache,
        )
    }
 }

-fun MediaViewerEntryPoint.Params.RoomMedia.toMediaItem() = when {
+fun MediaViewerEntryPoint.Params.RoomMedia.toMediaItem(
+    contentValidationState: ContentValidationState,
+) = when {
    mediaInfo.mimeType.isMimeTypeImage() -> {
        MediaItem.Image(
            id = UniqueId("dummy"),
@@ -80,7 +91,8 @@ fun MediaViewerEntryPoint.Params.RoomMedia.toMediaItem() = when {
            mediaInfo = mediaInfo,
            mediaSource = mediaSource,
            thumbnailSource = thumbnailSource,
-            blurHash = blurHash,
+            blurHash = null,
+            validationState = contentValidationState,
        )
    }
    mediaInfo.mimeType.isMimeTypeVideo() -> {
@@ -90,7 +102,8 @@ fun MediaViewerEntryPoint.Params.RoomMedia.toMediaItem() = when {
            mediaInfo = mediaInfo,
            mediaSource = mediaSource,
            thumbnailSource = thumbnailSource,
-            blurHash = blurHash,
+            blurHash = null,
+            validationState = contentValidationState,
        )
    }
    mediaInfo.mimeType.isMimeTypeAudio() -> {
@@ -100,6 +113,7 @@ fun MediaViewerEntryPoint.Params.RoomMedia.toMediaItem() = when {
                eventId = eventId,
                mediaInfo = mediaInfo,
                mediaSource = mediaSource,
+                validationState = contentValidationState,
            )
        } else {
            MediaItem.Voice(
@@ -107,6 +121,7 @@ fun MediaViewerEntryPoint.Params.RoomMedia.toMediaItem() = when {
                eventId = eventId,
                mediaInfo = mediaInfo,
                mediaSource = mediaSource,
+                validationState = contentValidationState,
            )
        }
    }
@@ -116,6 +131,7 @@ fun MediaViewerEntryPoint.Params.RoomMedia.toMediaItem() = when {
            eventId = eventId,
            mediaInfo = mediaInfo,
            mediaSource = mediaSource,
+            validationState = contentValidationState,
        )
    }
 }
@@ -12,11 +12,13 @@ import android.net.Uri
 import androidx.arch.core.executor.testing.InstantTaskExecutorRule
 import com.bumble.appyx.core.modality.BuildContext
 import com.google.common.truth.Truth.assertThat
+import io.element.android.features.contentscanner.api.ContentScannerService
 import io.element.android.features.enterprise.test.FakeEnterpriseService
 import io.element.android.libraries.matrix.api.core.EventId
 import io.element.android.libraries.matrix.api.media.MediaSource
 import io.element.android.libraries.matrix.test.A_SESSION_ID
 import io.element.android.libraries.matrix.test.media.FakeMatrixMediaLoader
+import io.element.android.libraries.matrix.ui.media.contentvalidation.NoopEventContentValidationCache
 import io.element.android.libraries.mediaplayer.test.FakeAudioFocus
 import io.element.android.libraries.mediaviewer.api.AvatarInfo
 import io.element.android.libraries.mediaviewer.api.MediaViewerEntryPoint
@@ -71,6 +73,8 @@ class DefaultMediaViewerEntryPointTest {
                audioFocus = FakeAudioFocus(),
                sessionId = A_SESSION_ID,
                enterpriseService = FakeEnterpriseService(),
+                contentValidationCache = NoopEventContentValidationCache(),
+                contentScannerService = ContentScannerService { _, _, _ -> },
            )
        }
        val callback = object : MediaViewerEntryPoint.Callback {
@@ -118,6 +122,8 @@ class DefaultMediaViewerEntryPointTest {
                audioFocus = FakeAudioFocus(),
                sessionId = A_SESSION_ID,
                enterpriseService = FakeEnterpriseService(),
+                contentValidationCache = NoopEventContentValidationCache(),
+                contentScannerService = ContentScannerService { _, _, _ -> },
            )
        }
        val callback = object : MediaViewerEntryPoint.Callback {
@@ -52,6 +52,8 @@ import io.element.android.libraries.matrix.test.timeline.aProfileChangeMessageCo
 import io.element.android.libraries.matrix.test.timeline.aStickerContent
 import io.element.android.libraries.matrix.test.timeline.anEventTimelineItem
 import io.element.android.libraries.matrix.test.timeline.item.event.aRoomMembershipContent
+import io.element.android.libraries.matrix.ui.media.contentvalidation.NoopContentValidationState
+import io.element.android.libraries.matrix.ui.media.contentvalidation.NoopEventContentValidationCache
 import io.element.android.libraries.mediaviewer.api.MediaInfo
 import io.element.android.libraries.mediaviewer.impl.model.MediaItem
 import io.element.android.libraries.mediaviewer.test.util.FileExtensionExtractorWithoutValidation
@@ -174,6 +176,7 @@ class EventItemFactoryTest {
                    duration = null,
                ),
                mediaSource = MediaSource(""),
+                validationState = noopValidationState,
            )
        )
    }
@@ -227,6 +230,7 @@ class EventItemFactoryTest {
                mediaSource = MediaSource(""),
                thumbnailSource = null,
                blurHash = null,
+                validationState = noopValidationState,
            )
        )
    }
@@ -274,6 +278,7 @@ class EventItemFactoryTest {
                    duration = null,
                ),
                mediaSource = MediaSource(""),
+                validationState = noopValidationState,
            )
        )
    }
@@ -328,6 +333,7 @@ class EventItemFactoryTest {
                mediaSource = MediaSource(""),
                thumbnailSource = null,
                blurHash = null,
+                validationState = noopValidationState,
            )
        )
    }
@@ -379,6 +385,7 @@ class EventItemFactoryTest {
                    duration = "7:36",
                ),
                mediaSource = MediaSource(""),
+                validationState = noopValidationState,
            )
        )
    }
@@ -440,6 +447,7 @@ class EventItemFactoryTest {
                mediaSource = MediaSource("image_url"),
                thumbnailSource = MediaSource("thumbnail_url"),
                blurHash = null,
+                validationState = noopValidationState,
            )
        )
    }
@@ -502,6 +510,7 @@ class EventItemFactoryTest {
                mediaSource = MediaSource("video_url"),
                thumbnailSource = MediaSource("thumbnail_url"),
                blurHash = null,
+                validationState = noopValidationState,
            )
        )
    }
@@ -557,6 +566,7 @@ class EventItemFactoryTest {
                    duration = null,
                ),
                mediaSource = MediaSource("audio_url"),
+                validationState = noopValidationState,
            )
        )
    }
@@ -613,6 +623,7 @@ class EventItemFactoryTest {
                    duration = null,
                ),
                mediaSource = MediaSource("file_url"),
+                validationState = noopValidationState,
            )
        )
    }
@@ -749,13 +760,16 @@ class EventItemFactoryTest {
                mediaSource = MediaSource(""),
                thumbnailSource = null,
                blurHash = null,
+                validationState = noopValidationState,
            )
        )
    }
 }

+private val noopValidationState = NoopContentValidationState()
 private fun createEventItemFactory() = EventItemFactory(
    fileSizeFormatter = FakeFileSizeFormatter(),
    fileExtensionExtractor = FileExtensionExtractorWithoutValidation(),
    dateFormatter = FakeDateFormatter(),
+    contentValidationCache = NoopEventContentValidationCache(noopValidationState),
 )
@@ -34,6 +34,8 @@ import io.element.android.libraries.matrix.test.timeline.FakeTimeline
 import io.element.android.libraries.matrix.test.timeline.aMessageContent
 import io.element.android.libraries.matrix.test.timeline.anEventTimelineItem
 import io.element.android.libraries.matrix.ui.components.A_BLUR_HASH
+import io.element.android.libraries.matrix.ui.media.contentvalidation.NoopContentValidationState
+import io.element.android.libraries.matrix.ui.media.contentvalidation.NoopEventContentValidationCache
 import io.element.android.libraries.mediaviewer.api.MediaInfo
 import io.element.android.libraries.mediaviewer.impl.model.GroupedMediaItems
 import io.element.android.libraries.mediaviewer.impl.model.MediaItem
@@ -250,6 +252,7 @@ class TimelineMediaGalleryDataSourceTest {
                                mediaSource = MediaSource("url"),
                                thumbnailSource = MediaSource("url_thumbnail"),
                                blurHash = A_BLUR_HASH,
+                                validationState = noopValidationState,
                            )
                        ),
                        fileItems = persistentListOf()
@@ -260,6 +263,8 @@ class TimelineMediaGalleryDataSourceTest {
    }
 }

+private val noopValidationState = NoopContentValidationState()
+
 internal fun TestScope.createTimelineMediaGalleryDataSource(
    room: JoinedRoom = FakeJoinedRoom(
        liveTimeline = FakeTimeline(),
@@ -282,5 +287,6 @@ fun TestScope.createTimelineMediaItemsFactory() = TimelineMediaItemsFactory(
        fileSizeFormatter = FakeFileSizeFormatter(),
        fileExtensionExtractor = FileExtensionExtractorWithoutValidation(),
        dateFormatter = FakeDateFormatter(),
-    ),
+        contentValidationCache = NoopEventContentValidationCache(noopValidationState),
+    )
 )
@@ -534,6 +534,7 @@ class MediaGalleryPresenterTest {
            mediaLoader = matrixMediaLoader,
            localMediaActions = localMediaActions,
            snackbarDispatcher = snackbarDispatcher,
+            contentScannerService = { _, _, _ -> },
        )
    }
 }
@@ -16,6 +16,7 @@ import io.element.android.libraries.matrix.api.media.MediaSource
 import io.element.android.libraries.matrix.api.timeline.Timeline
 import io.element.android.libraries.matrix.test.AN_EVENT_ID
 import io.element.android.libraries.matrix.test.A_USER_ID
+import io.element.android.libraries.matrix.ui.media.contentvalidation.NoopContentValidationState
 import io.element.android.libraries.mediaviewer.api.GalleryInfo
 import io.element.android.libraries.mediaviewer.api.GalleryItemData
 import io.element.android.libraries.mediaviewer.api.MediaInfo
@@ -95,6 +96,7 @@ class GalleryMediaGalleryDataSourceTest {
                )
            ),
            galleryInfo = aGalleryInfo(),
+            contentValidationState = noopValidationState,
        )
        val data = (result.getLastData() as AsyncData.Success).data
        assertThat(data.fileItems).isEmpty()
@@ -106,6 +108,7 @@ class GalleryMediaGalleryDataSourceTest {
                mediaSource = MediaSource("image_url"),
                thumbnailSource = MediaSource("thumbnail_url"),
                blurHash = null,
+                validationState = noopValidationState,
            )
        )
    }
@@ -125,6 +128,7 @@ class GalleryMediaGalleryDataSourceTest {
                )
            ),
            galleryInfo = aGalleryInfo(),
+            contentValidationState = noopValidationState,
        )
        val data = (result.getLastData() as AsyncData.Success).data
        assertThat(data.fileItems).isEmpty()
@@ -136,6 +140,7 @@ class GalleryMediaGalleryDataSourceTest {
                mediaSource = MediaSource("video_url"),
                thumbnailSource = MediaSource("thumbnail_url"),
                blurHash = null,
+                validationState = noopValidationState,
            )
        )
    }
@@ -155,6 +160,7 @@ class GalleryMediaGalleryDataSourceTest {
                )
            ),
            galleryInfo = aGalleryInfo(),
+            contentValidationState = noopValidationState,
        )
        val data = (result.getLastData() as AsyncData.Success).data
        assertThat(data.fileItems).isEmpty()
@@ -164,6 +170,7 @@ class GalleryMediaGalleryDataSourceTest {
                eventId = AN_EVENT_ID,
                mediaInfo = expectedMediaInfo("audio.mp3", MimeTypes.Mp3),
                mediaSource = MediaSource("audio_url"),
+                validationState = noopValidationState,
            )
        )
    }
@@ -183,6 +190,7 @@ class GalleryMediaGalleryDataSourceTest {
                )
            ),
            galleryInfo = aGalleryInfo(),
+            contentValidationState = noopValidationState,
        )
        val data = (result.getLastData() as AsyncData.Success).data
        assertThat(data.fileItems).isEmpty()
@@ -192,6 +200,7 @@ class GalleryMediaGalleryDataSourceTest {
                eventId = AN_EVENT_ID,
                mediaInfo = expectedMediaInfo("document.pdf", MimeTypes.Pdf),
                mediaSource = MediaSource("file_url"),
+                validationState = noopValidationState,
            )
        )
    }
@@ -211,6 +220,7 @@ class GalleryMediaGalleryDataSourceTest {
                )
            ),
            galleryInfo = aGalleryInfo(),
+            contentValidationState = noopValidationState,
        )
        val data = (result.getLastData() as AsyncData.Success).data
        val item = data.imageAndVideoItems.single() as MediaItem.Image
@@ -249,6 +259,7 @@ class GalleryMediaGalleryDataSourceTest {
                ),
            ),
            galleryInfo = aGalleryInfo(),
+            contentValidationState = noopValidationState,
        )
        val data = (result.getLastData() as AsyncData.Success).data
        assertThat(data.fileItems).isEmpty()
@@ -258,6 +269,8 @@ class GalleryMediaGalleryDataSourceTest {
        assertThat((data.imageAndVideoItems[2] as MediaItem.Video).id).isEqualTo(UniqueId("${AN_EVENT_ID.value}_2"))
    }

+    private val noopValidationState = NoopContentValidationState()
+
    private fun aGalleryInfo() = GalleryInfo(
        caption = "A caption",
        formattedCaption = null,
@@ -18,6 +18,7 @@ import io.element.android.libraries.matrix.test.AN_EVENT_ID
 import io.element.android.libraries.matrix.test.AN_EVENT_ID_2
 import io.element.android.libraries.matrix.test.AN_EXCEPTION
 import io.element.android.libraries.matrix.test.media.FakeMatrixMediaLoader
+import io.element.android.libraries.matrix.ui.media.contentvalidation.NoopEventContentValidationCache
 import io.element.android.libraries.mediaviewer.api.MediaViewerEntryPoint.MediaViewerMode
 import io.element.android.libraries.mediaviewer.api.local.LocalMediaFactory
 import io.element.android.libraries.mediaviewer.impl.datasource.FakeMediaGalleryDataSource
@@ -290,5 +291,7 @@ class MediaViewerDataSourceTest {
        localMediaFactory = localMediaFactory,
        systemClock = FakeSystemClock(),
        pagerKeysHandler = PagerKeysHandler(),
+        contentScannerService = { _, _, _ -> },
+        contentValidationCache = NoopEventContentValidationCache(),
    )
 }
@@ -30,6 +30,7 @@ import io.element.android.libraries.matrix.test.room.FakeBaseRoom
 import io.element.android.libraries.matrix.test.room.FakeJoinedRoom
 import io.element.android.libraries.matrix.test.room.powerlevels.FakeRoomPermissions
 import io.element.android.libraries.matrix.test.timeline.FakeTimeline
+import io.element.android.libraries.matrix.ui.media.contentvalidation.NoopEventContentValidationCache
 import io.element.android.libraries.mediaviewer.api.AvatarInfo
 import io.element.android.libraries.mediaviewer.api.MediaViewerEntryPoint
 import io.element.android.libraries.mediaviewer.api.anApkMediaInfo
@@ -969,6 +970,8 @@ internal fun TestScope.createMediaViewerPresenter(
            localMediaFactory = localMediaFactory,
            systemClock = FakeSystemClock(),
            pagerKeysHandler = PagerKeysHandler(),
+            contentScannerService = { _, _, _ -> },
+            contentValidationCache = NoopEventContentValidationCache(),
        ),
        room = room,
        localMediaActions = localMediaActions,
@@ -16,6 +16,7 @@ import io.element.android.libraries.matrix.api.core.UniqueId
 import io.element.android.libraries.matrix.api.timeline.Timeline
 import io.element.android.libraries.matrix.test.AN_EVENT_ID
 import io.element.android.libraries.matrix.test.media.aMediaSource
+import io.element.android.libraries.matrix.ui.media.contentvalidation.NoopEventContentValidationCache
 import io.element.android.libraries.mediaviewer.api.MediaInfo
 import io.element.android.libraries.mediaviewer.api.MediaViewerEntryPoint
 import io.element.android.libraries.mediaviewer.api.aVideoMediaInfo
@@ -36,22 +37,24 @@ class SingleMediaGalleryDataSourceTest {
    @get:Rule
    val warmUpRule = WarmUpRule()

+    private val contentValidationCache = NoopEventContentValidationCache()
+
    @Test
    fun `function start is no op`() = runTest {
-        val sut = SingleMediaGalleryDataSource(aGroupedMediaItems())
+        val sut = SingleMediaGalleryDataSource(aGroupedMediaItems(), contentValidationCache)
        sut.start(backgroundScope)
    }

    @Test
    fun `function loadMore is no op`() = runTest {
-        val sut = SingleMediaGalleryDataSource(aGroupedMediaItems())
+        val sut = SingleMediaGalleryDataSource(aGroupedMediaItems(), contentValidationCache)
        sut.loadMore(Timeline.PaginationDirection.BACKWARDS)
        sut.loadMore(Timeline.PaginationDirection.FORWARDS)
    }

    @Test
    fun `function deleteItem is no op`() = runTest {
-        val sut = SingleMediaGalleryDataSource(aGroupedMediaItems())
+        val sut = SingleMediaGalleryDataSource(aGroupedMediaItems(), contentValidationCache)
        sut.deleteItem(AN_EVENT_ID)
    }

@@ -61,7 +64,7 @@ class SingleMediaGalleryDataSourceTest {
            imageAndVideoItems = listOf(aMediaItemImage()),
            fileItems = listOf(aMediaItemFile()),
        )
-        val sut = SingleMediaGalleryDataSource(data)
+        val sut = SingleMediaGalleryDataSource(data, contentValidationCache)
        assertThat(sut.getLastData()).isEqualTo(AsyncData.Success(data))
    }

@@ -71,7 +74,7 @@ class SingleMediaGalleryDataSourceTest {
            imageAndVideoItems = listOf(aMediaItemImage()),
            fileItems = listOf(aMediaItemFile()),
        )
-        val sut = SingleMediaGalleryDataSource(data)
+        val sut = SingleMediaGalleryDataSource(data, contentValidationCache)
        sut.groupedMediaItemsFlow().test {
            assertThat(awaitItem()).isEqualTo(AsyncData.Success(data))
            awaitComplete()
@@ -90,6 +93,7 @@ class SingleMediaGalleryDataSourceTest {
                    mediaSource = params.mediaSource,
                    thumbnailSource = params.thumbnailSource,
                    blurHash = null,
+                    validationState = contentValidationCache[AN_EVENT_ID],
                )
            }
        )
@@ -107,6 +111,7 @@ class SingleMediaGalleryDataSourceTest {
                    mediaSource = params.mediaSource,
                    thumbnailSource = params.thumbnailSource,
                    blurHash = null,
+                    validationState = contentValidationCache[AN_EVENT_ID],
                )
            }
        )
@@ -122,6 +127,7 @@ class SingleMediaGalleryDataSourceTest {
                    eventId = params.eventId,
                    mediaInfo = params.mediaInfo,
                    mediaSource = params.mediaSource,
+                    validationState = contentValidationCache[AN_EVENT_ID],
                )
            }
        )
@@ -140,6 +146,7 @@ class SingleMediaGalleryDataSourceTest {
                    eventId = params.eventId,
                    mediaInfo = params.mediaInfo,
                    mediaSource = params.mediaSource,
+                    validationState = contentValidationCache[AN_EVENT_ID],
                )
            }
        )
@@ -155,6 +162,7 @@ class SingleMediaGalleryDataSourceTest {
                    eventId = params.eventId,
                    mediaInfo = params.mediaInfo,
                    mediaSource = params.mediaSource,
+                    validationState = contentValidationCache[AN_EVENT_ID],
                )
            }
        )
@@ -165,7 +173,7 @@ class SingleMediaGalleryDataSourceTest {
        expectedResult: (MediaViewerEntryPoint.Params.RoomMedia) -> MediaItem,
    ) {
        val params = aMediaViewerEntryPointParams(mediaInfo)
-        val result = params.toMediaItem()
+        val result = params.toMediaItem(contentValidationCache[AN_EVENT_ID],)
        assertThat(result).isEqualTo(expectedResult(params))
    }

@@ -23,14 +23,17 @@ import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.graphics.vector.ImageVector
+import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.semantics.clearAndSetSemantics
 import androidx.compose.ui.semantics.contentDescription
+import androidx.compose.ui.semantics.stateDescription
 import androidx.compose.ui.unit.dp
 import io.element.android.compound.theme.ElementTheme
 import io.element.android.compound.tokens.generated.CompoundIcons
 import io.element.android.libraries.designsystem.preview.ElementPreview
 import io.element.android.libraries.designsystem.preview.PreviewsDayNight
 import io.element.android.libraries.designsystem.theme.components.Icon
+import io.element.android.libraries.ui.strings.CommonStrings

@Composable
 internal fun FormattingOption(
@@ -52,6 +55,8 @@ internal fun FormattingOption(
        FormattingOptionState.Default -> ElementTheme.colors.iconSecondary
        FormattingOptionState.Disabled -> ElementTheme.colors.iconDisabled
    }
+    val activeStateDescription = stringResource(CommonStrings.a11y_active)
+    val inactiveStateDescription = stringResource(CommonStrings.a11y_inactive)
    Box(
        modifier = modifier
            .clickable(
@@ -77,6 +82,13 @@ internal fun FormattingOption(
            )
            .clearAndSetSemantics {
                this.contentDescription = contentDescription
+                if (toggleable) {
+                    this.stateDescription = if (state == FormattingOptionState.Selected) {
+                        activeStateDescription
+                    } else {
+                        inactiveStateDescription
+                    }
+                }
            }
    ) {
        Box(
@@ -10,4 +10,6 @@
    <string name="a11y_jump_to_unread_messages">"Jump to first unread message"</string>
    <string name="screen_local_network_opt_in_title">Allow access to local network</string>
    <string name="screen_local_network_opt_in_subtitle">Your homeserver is on your local network. To connect, Element needs permission to reach other devices on this network.</string>
+    <string name="a11y_active">Active</string>
+    <string name="a11y_inactive">Inactive</string>
 </resources>
--- a/Show More
+++ b/Show More