feat: [WIP] try LinkPresentation

Mastodon/Diffiable/Section/StatusSection.swift

@@ -12,6 +12,7 @@ import os.log
 import UIKit
 import AVKit
 import Nuke
+import LinkPresentation
 
 #if ASDK
 import AsyncDisplayKit
@@ -598,6 +599,39 @@ extension StatusSection {
 
             let isSingleMosaicLayout = mosaics.count == 1
 
+            // set link preview
+            cell.statusView.linkPreview.isHidden = true
+
+            var _firstURL: URL? = {
+                for entity in cell.statusView.activeTextLabel.activeEntities {
+                    guard case let .url(_, _, url, _) = entity.type else { continue }
+                    return URL(string: url)
+                }
+                return nil
+            }()
+
+            if let url = _firstURL {
+                Future<LPLinkMetadata?, Error> { promise in
+                    LPMetadataProvider().startFetchingMetadata(for: url) { meta, error in
+                        if let error = error {
+                            promise(.failure(error))
+                        } else {
+                            promise(.success(meta))
+                        }
+                    }
+                }
+                .receive(on: RunLoop.main)
+                .sink { _ in
+                    // do nothing
+                } receiveValue: { [weak cell] meta in
+                    guard let meta = meta else { return }
+                    guard let cell = cell else { return }
+                    cell.statusView.linkPreview.metadata = meta
+                    cell.statusView.linkPreview.isHidden = false
+                }
+                .store(in: &cell.disposeBag)
+            }
+
             // set image
             let imageSize = CGSize(
                 width: mosaic.imageViewSize.width * imageView.traitCollection.displayScale,

Mastodon/Scene/Share/View/Content/StatusView.swift

@@ -12,6 +12,7 @@ import AVKit
 import ActiveLabel
 import AlamofireImage
 import FLAnimatedImage
+import LinkPresentation
 
 protocol StatusViewDelegate: AnyObject {
     func statusView(_ statusView: StatusView, headerInfoLabelDidPressed label: UILabel)
@@ -203,7 +204,9 @@ final class StatusView: UIView {
     private let headerInfoLabelTapGestureRecognizer = UITapGestureRecognizer.singleTapGestureRecognizer
     
     var isRevealing = true
-        
+
+    let linkPreview = LPLinkView()
+
     override init(frame: CGRect) {
         super.init(frame: frame)
         _init()
@@ -357,6 +360,10 @@ extension StatusView {
         statusContainerStackView.addArrangedSubview(activeTextLabel)
         activeTextLabel.setContentCompressionResistancePriority(.required - 1, for: .vertical)
 
+        // link preview
+        statusContainerStackView.addArrangedSubview(linkPreview)
+        linkPreview.setContentHuggingPriority(.defaultHigh, for: .vertical)
+
         // image
         statusContainerStackView.addArrangedSubview(statusMosaicImageViewContainer)