Video playback (#308)

* Create media player screen

* Introduce `FileCache` to cache message attachments

* Add file loading functionality into the media provider

* Process tap action on timeline items

* Pass item taps to view model

* Navigate to media player on view model callback

* Commit project file

* Add changelog

* Rename media to video

* Add a loader when large videos being processed

* Add back button explicitly on video screen, fixes for light scheme

* Handle right swipe to dismiss video

UnitTests/Sources/FileCacheTests.swift

@@ -0,0 +1,78 @@
+//
+// Copyright 2022 New Vector Ltd
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+import Foundation
+import XCTest
+
+@testable import ElementX
+
+class FileCacheTests: XCTestCase {
+    private var cache: FileCache!
+
+    override func setUp() {
+        cache = .default
+    }
+
+    override func tearDown() async throws {
+        try cache.removeAll()
+    }
+
+    func testExistence() throws {
+        let data = Data(repeating: 1, count: 32)
+        let key = "some_key"
+        let fileExtension = "mp4"
+
+        let url1 = try cache.store(data, with: fileExtension, forKey: key)
+        let url2 = cache.file(forKey: key, fileExtension: fileExtension)
+
+        XCTAssertEqual(url1, url2)
+    }
+
+    func testRemove() throws {
+        let data = Data(repeating: 1, count: 32)
+        let key = "some_key"
+        let fileExtension = "mp4"
+
+        _ = try cache.store(data, with: fileExtension, forKey: key)
+        try cache.remove(forKey: key, fileExtension: fileExtension)
+        let url = cache.file(forKey: key, fileExtension: fileExtension)
+
+        XCTAssertNil(url)
+    }
+
+    func testRemoveAll() throws {
+        let data1 = Data(repeating: 1, count: 32)
+        let key1 = "some_key_1"
+        let fileExtension1 = "mp4"
+
+        let data2 = Data(repeating: 1, count: 64)
+        let key2 = "some_key_2"
+        let fileExtension2 = "mp4"
+
+        _ = try cache.store(data1, with: fileExtension1, forKey: key1)
+        _ = try cache.store(data2, with: fileExtension2, forKey: key2)
+        try cache.removeAll()
+        let url1 = cache.file(forKey: key1, fileExtension: fileExtension1)
+        let url2 = cache.file(forKey: key2, fileExtension: fileExtension2)
+
+        XCTAssertNil(url1)
+        XCTAssertNil(url2)
+    }
+
+    func testRemoveAllWhenEmpty() throws {
+        XCTAssertNoThrow(try cache.removeAll())
+    }
+}

UnitTests/Sources/VideoPlayerViewModelTests.swift

@@ -0,0 +1,44 @@
+//
+// Copyright 2022 New Vector Ltd
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+import XCTest
+
+@testable import ElementX
+
+@MainActor
+class VideoPlayerScreenViewModelTests: XCTestCase {
+    var viewModel: VideoPlayerViewModelProtocol!
+    var context: VideoPlayerViewModelType.Context!
+    
+    @MainActor override func setUpWithError() throws {
+        viewModel = VideoPlayerViewModel(videoURL: URL(staticString: "https://storage.googleapis.com/gtv-videos-bucket/sample/BigBuckBunny.mp4"), autoplay: true)
+        context = viewModel.context
+    }
+
+    @MainActor func testCancel() async throws {
+        var correctResult = false
+        viewModel.callback = { result in
+            switch result {
+            case .cancel:
+                correctResult = true
+            }
+        }
+
+        context.send(viewAction: .cancel)
+        await Task.yield()
+        XCTAssert(correctResult)
+    }
+}