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Content scanner (Element Pro): scan timeline events for unsafe content (#7159)

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* Simplify how event content with captions are displayed

The caption component will now be added in `TimelineItemEventContentView` instead of separately in each `TimelineItem__View` component

* Make sure `CoilMediaFetcher` methods to fetch media throw errors

We need to catch them later to check if the content scanner marked some thumbnails or medias as invalid/unsafe in `AsyncImage` instances

* Add a `ContentScannerService` that allows us to manually scan a list of medias in an event and then update and store the results

The results take the form of `ContentValidationValue`, stored in a `ContentValidationState` instance tied to the event

* Create `EventContentValidationCache` to keep the `ContentValidationStates` for events in a room

* Expose `EventContentValidationCache` to Compose using `LocalEventContentValidationState`

Also add a couple of helper functions to avoid having to manually remember the states

* Use the new components to display invalid content in the timeline items

* Add `blurhash` to most media items so we can use it while validating the thumbnails/medias

* Fix custom layout issues with screenshot and UI tests

* Also check the validation state for replied-to events in the composer

* Fix and add tests

* Handle unrecoverable content validation errors too: display a 'not found' UI

* Improve the performance of `EqualWidthColumn` for the single item case

* Update screenshots

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Co-authored-by: ElementBot <android@element.io>
This commit is contained in:
Jorge Martin Espinosa
2026-07-16 09:59:51 +02:00
committed by GitHub
parent 56cf00560e
commit 0d03472c60
241 changed files with 2881 additions and 828 deletions
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features/contentscanner/api/src/main/kotlin/io/element/android/features/contentscanner/api/ContentScannerService.kt
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/*
* 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.features.contentscanner.api
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.scanner.ContentScanner
import io.element.android.libraries.matrix.ui.media.contentvalidation.ContentValidationState
/**
* Service to perform security scans in the contents for a given event and media source.
*
* The default implementation (FOSS) always returns a valid state.
* This will only process media when a [ContentScanner] is provided when building the client in Pro.
*/
fun interface ContentScannerService {
fun scan(eventId: EventId, mediaSources: List<MediaSource>, contentValidationState: ContentValidationState)
}