Add support (sort of) for gifv attachments

See #98

Tusker.xcodeproj/project.pbxproj

@@ -134,6 +134,8 @@
 		D64D0AB12128D9AE005A6F37 /* OnboardingViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = D64D0AB02128D9AE005A6F37 /* OnboardingViewController.swift */; };
 		D64D8CA92463B494006B0BAA /* CachedDictionary.swift in Sources */ = {isa = PBXBuildFile; fileRef = D64D8CA82463B494006B0BAA /* CachedDictionary.swift */; };
 		D64F80E2215875CC00BEF393 /* XCBActionType.swift in Sources */ = {isa = PBXBuildFile; fileRef = D64F80E1215875CC00BEF393 /* XCBActionType.swift */; };
+		D6531DEE246B81C9000F9538 /* GifvAttachmentView.swift in Sources */ = {isa = PBXBuildFile; fileRef = D6531DED246B81C9000F9538 /* GifvAttachmentView.swift */; };
+		D6531DF0246B867E000F9538 /* GifvAttachmentViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = D6531DEF246B867E000F9538 /* GifvAttachmentViewController.swift */; };
 		D6538945214D6D7500E3CEFC /* TableViewSwipeActionProvider.swift in Sources */ = {isa = PBXBuildFile; fileRef = D6538944214D6D7500E3CEFC /* TableViewSwipeActionProvider.swift */; };
 		D65A37F321472F300087646E /* SwiftSoup.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = D6BED16E212663DA00F02DA0 /* SwiftSoup.framework */; };
 		D65F613423AEAB6600F3CFD3 /* OnboardingTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = D65F613323AEAB6600F3CFD3 /* OnboardingTests.swift */; };
@@ -428,6 +430,8 @@
 		D64D0AB02128D9AE005A6F37 /* OnboardingViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = OnboardingViewController.swift; sourceTree = "<group>"; };
 		D64D8CA82463B494006B0BAA /* CachedDictionary.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = CachedDictionary.swift; sourceTree = "<group>"; };
 		D64F80E1215875CC00BEF393 /* XCBActionType.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = XCBActionType.swift; sourceTree = "<group>"; };
+		D6531DED246B81C9000F9538 /* GifvAttachmentView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = GifvAttachmentView.swift; sourceTree = "<group>"; };
+		D6531DEF246B867E000F9538 /* GifvAttachmentViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = GifvAttachmentViewController.swift; sourceTree = "<group>"; };
 		D6538944214D6D7500E3CEFC /* TableViewSwipeActionProvider.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = TableViewSwipeActionProvider.swift; sourceTree = "<group>"; };
 		D65F612D23AE990C00F3CFD3 /* Embassy.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; path = Embassy.framework; sourceTree = BUILT_PRODUCTS_DIR; };
 		D65F613023AE99E000F3CFD3 /* Ambassador.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; path = Ambassador.framework; sourceTree = BUILT_PRODUCTS_DIR; };
@@ -597,6 +601,7 @@
 			children = (
 				04D14BAE22B34A2800642648 /* GalleryViewController.swift */,
 				D647D92724257BEB0005044F /* AttachmentPreviewViewController.swift */,
+				D6531DEF246B867E000F9538 /* GifvAttachmentViewController.swift */,
 			);
 			path = "Attachment Gallery";
 			sourceTree = "<group>";
@@ -1216,6 +1221,7 @@
 			isa = PBXGroup;
 			children = (
 				D6C94D882139E6EC00CB5196 /* AttachmentView.swift */,
+				D6531DED246B81C9000F9538 /* GifvAttachmentView.swift */,
 				D6C7D27C22B6EBF800071952 /* AttachmentsContainerView.swift */,
 			);
 			path = Attachments;
@@ -1650,6 +1656,7 @@
 			buildActionMask = 2147483647;
 			files = (
 				D626493523BD94CE00612E6E /* CompositionAttachmentData.swift in Sources */,
+				D6531DF0246B867E000F9538 /* GifvAttachmentViewController.swift in Sources */,
 				D6285B5321EA708700FE4B39 /* StatusFormat.swift in Sources */,
 				D6DD353D22F28CD000A9563A /* ContentWarningCopyMode.swift in Sources */,
 				0427033A22B31269000D31B6 /* AdvancedPrefsView.swift in Sources */,
@@ -1702,6 +1709,7 @@
 				D6B053A623BD2D0C00A066FA /* AssetCollectionViewController.swift in Sources */,
 				04DACE8E212CC7CC009840C4 /* ImageCache.swift in Sources */,
 				D627FF7B217E951500CC0648 /* DraftsTableViewController.swift in Sources */,
+				D6531DEE246B81C9000F9538 /* GifvAttachmentView.swift in Sources */,
 				D6370B9C24421FF30092A7FF /* Tusker.xcdatamodeld in Sources */,
 				D6A3BC8F2321FFB900FD64D5 /* StatusActionAccountListTableViewController.swift in Sources */,
 				D6AEBB4823216B1D00E5038B /* AccountActivity.swift in Sources */,

Tusker/Screens/Attachment Gallery/GalleryViewController.swift

@@ -75,6 +75,8 @@ class GalleryViewController: UIPageViewController, UIPageViewControllerDataSourc
                 let vc = AVPlayerViewController()
                 vc.player = AVPlayer(url: $0.url)
                 return vc
+            case .gifv:
+                return GifvAttachmentViewController(attachment: $0)
             default:
                 fatalError()
             }

Tusker/Screens/Attachment Gallery/GifvAttachmentViewController.swift

@@ -0,0 +1,33 @@
+//
+//  GifvAttachmentViewController.swift
+//  Tusker
+//
+//  Created by Shadowfacts on 5/12/20.
+//  Copyright © 2020 Shadowfacts. All rights reserved.
+//
+
+import UIKit
+import Pachyderm
+import AVFoundation
+
+class GifvAttachmentViewController: UIViewController {
+
+    private let attachment: Attachment
+    
+    init(attachment: Attachment) {
+        precondition(attachment.kind == .gifv)
+        self.attachment = attachment
+        
+        super.init(nibName: nil, bundle: nil)
+    }
+    
+    required init?(coder: NSCoder) {
+        fatalError("init(coder:) has not been implemented")
+    }
+
+    override func loadView() {
+        let asset = AVURLAsset(url: attachment.url)
+        self.view = GifvAttachmentView(asset: asset, gravity: .resizeAspect)
+    }
+
+}

Tusker/Views/Attachments/AttachmentView.swift

@@ -81,6 +81,8 @@ class AttachmentView: UIImageView, GIFAnimatable {
             loadVideo()
         case .audio:
             loadAudio()
+        case .gifv:
+            loadGifv()
         default:
             preconditionFailure("invalid attachment type")
         }
@@ -111,9 +113,9 @@ class AttachmentView: UIImageView, GIFAnimatable {
             let asset = AVURLAsset(url: attachmentURL)
             let generator = AVAssetImageGenerator(asset: asset)
             generator.appliesPreferredTrackTransform = true
-            guard let image = try? generator.copyCGImage(at: CMTime(seconds: 0, preferredTimescale: 1), actualTime: nil) else { return }
+            guard let image = try? generator.copyCGImage(at: .zero, actualTime: nil) else { return }
-            DispatchQueue.main.async {
+            DispatchQueue.main.async { [weak self] in
-                guard self.attachment.url == attachmentURL else { return }
+                guard let self = self, self.attachment.url == attachmentURL else { return }
                 self.image = UIImage(cgImage: image)
             }
         }
@@ -150,6 +152,30 @@ class AttachmentView: UIImageView, GIFAnimatable {
         ])
     }
     
+    func loadGifv() {
+        let attachmentURL = self.attachment.url
+        let asset = AVURLAsset(url: attachmentURL)
+        DispatchQueue.global(qos: .userInitiated).async {
+            let generator = AVAssetImageGenerator(asset: asset)
+            generator.appliesPreferredTrackTransform = true
+            guard let image = try? generator.copyCGImage(at: .zero, actualTime: nil) else { return }
+            DispatchQueue.main.async { [weak self] in
+                guard let self = self, self.attachment.url == attachmentURL else { return }
+                self.image = UIImage(cgImage: image)
+            }
+        }
+        
+        let gifvView = GifvAttachmentView(asset: asset, gravity: .resizeAspectFill)
+        gifvView.translatesAutoresizingMaskIntoConstraints = false
+        addSubview(gifvView)
+        NSLayoutConstraint.activate([
+            gifvView.leadingAnchor.constraint(equalTo: leadingAnchor),
+            gifvView.trailingAnchor.constraint(equalTo: trailingAnchor),
+            gifvView.topAnchor.constraint(equalTo: topAnchor),
+            gifvView.bottomAnchor.constraint(equalTo: bottomAnchor),
+        ])
+    }
+    
     override func display(_ layer: CALayer) {
         updateImageIfNeeded()
     }

Tusker/Views/Attachments/AttachmentsContainerView.swift

@@ -11,7 +11,7 @@ import Pachyderm
 
 class AttachmentsContainerView: UIView {
 
-    static let supportedAttachmentTypes = [Attachment.Kind.image, .video, .audio]
+    static let supportedAttachmentTypes = [Attachment.Kind.image, .video, .audio, .gifv]
     
     weak var delegate: AttachmentViewDelegate?
     

Tusker/Views/Attachments/GifvAttachmentView.swift

@@ -0,0 +1,49 @@
+//
+//  GifvAttachmentView.swift
+//  Tusker
+//
+//  Created by Shadowfacts on 5/12/20.
+//  Copyright © 2020 Shadowfacts. All rights reserved.
+//
+
+import UIKit
+import AVFoundation
+
+class GifvAttachmentView: UIView {
+    
+    override class var layerClass: AnyClass {
+        return AVPlayerLayer.self
+    }
+    
+    private var playerLayer: AVPlayerLayer {
+        layer as! AVPlayerLayer
+    }
+
+    private let item: AVPlayerItem
+    private let player: AVPlayer
+    
+    init(asset: AVAsset, gravity: AVLayerVideoGravity) {
+        item = AVPlayerItem(asset: asset)
+        player = AVPlayer(playerItem: item)
+
+        super.init(frame: .zero)
+        
+        playerLayer.player = player
+        playerLayer.videoGravity = gravity
+        player.play()
+        
+        NotificationCenter.default.addObserver(self, selector: #selector(restartItem), name: .AVPlayerItemDidPlayToEndTime, object: item)
+    }
+    
+    required init?(coder: NSCoder) {
+        fatalError("init(coder:) has not been implemented")
+    }
+    
+    @objc func restartItem() {
+        item.seek(to: .zero) { (success) in
+            guard success else { return }
+            self.player.play()
+        }
+    }
+
+}