Ref #1499: Add link preview to long press context menu.

BraveShared/BraveStrings.swift

@@ -29,6 +29,8 @@ extension Strings {
     public static let SaveButtonTitle = NSLocalizedString("SaveButtonTitle", tableName: "BraveShared", bundle: Bundle.braveShared, value: "Save", comment: "Label for the button used to save data")
     public static let Share = NSLocalizedString("CommonShare", tableName: "BraveShared", bundle: Bundle.braveShared, value: "Share", comment: "Text to select sharing something (example: image, video, URL)")
     public static let Download = NSLocalizedString("CommonDownload", tableName: "BraveShared", bundle: Bundle.braveShared, value: "Download", comment: "Text to choose for downloading a file (example: saving an image to phone)")
+    public static let ShowLinkPreviewsActionTitle = NSLocalizedString("ShowLinkPreviewsActionTitle", tableName: "BraveShared", bundle: Bundle.braveShared, value: "Show Link Previews", comment: "Context menu item for showing link previews")
+    public static let HideLinkPreviewsActionTitle = NSLocalizedString("HideLinkPreviewsActionTitle", tableName: "BraveShared", bundle: Bundle.braveShared, value: "Hide Link Previews", comment: "Context menu item for hiding link previews")
 }
 
 // MARK:-  UIAlertControllerExtensions.swift

Client.xcodeproj/project.pbxproj

@@ -16,6 +16,7 @@
 		0A0D3D5221A565C300BEE65B /* SafeBrowsingHandler.swift in Sources */ = {isa = PBXBuildFile; fileRef = 0A0D3D5121A565C300BEE65B /* SafeBrowsingHandler.swift */; };
 		0A0D3D6121A596BE00BEE65B /* MalwareList.swift in Sources */ = {isa = PBXBuildFile; fileRef = 0A0D3D6021A596BE00BEE65B /* MalwareList.swift */; };
 		0A19362F234D44DB002E2B81 /* AppearanceAttributes.swift in Sources */ = {isa = PBXBuildFile; fileRef = 0A19362E234D44DB002E2B81 /* AppearanceAttributes.swift */; };
+		0A19365423508756002E2B81 /* LinkPreviewViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 0A19365323508756002E2B81 /* LinkPreviewViewController.swift */; };
 		0A1E842D21909CA70042F782 /* crypto.js in Resources */ = {isa = PBXBuildFile; fileRef = 0A1E842C21909CA70042F782 /* crypto.js */; };
 		0A1E842F21909CBC0042F782 /* bundle.js in Resources */ = {isa = PBXBuildFile; fileRef = 0A1E842E21909CBB0042F782 /* bundle.js */; };
 		0A1E843121909CC40042F782 /* fetch.js in Resources */ = {isa = PBXBuildFile; fileRef = 0A1E843021909CC30042F782 /* fetch.js */; };
@@ -1178,6 +1179,7 @@
 		0A0D3D5121A565C300BEE65B /* SafeBrowsingHandler.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SafeBrowsingHandler.swift; sourceTree = "<group>"; };
 		0A0D3D6021A596BE00BEE65B /* MalwareList.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = MalwareList.swift; sourceTree = "<group>"; };
 		0A19362E234D44DB002E2B81 /* AppearanceAttributes.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AppearanceAttributes.swift; sourceTree = "<group>"; };
+		0A19365323508756002E2B81 /* LinkPreviewViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = LinkPreviewViewController.swift; sourceTree = "<group>"; };
 		0A1E841B219095410042F782 /* README.md */ = {isa = PBXFileReference; lastKnownFileType = net.daringfireball.markdown; path = README.md; sourceTree = "<group>"; };
 		0A1E842C21909CA70042F782 /* crypto.js */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.javascript; name = crypto.js; path = "node_modules/brave-sync/node_modules/brave-crypto/browser/crypto.js"; sourceTree = SOURCE_ROOT; };
 		0A1E842E21909CBB0042F782 /* bundle.js */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.javascript; name = bundle.js; path = "node_modules/brave-sync/bundles/bundle.js"; sourceTree = SOURCE_ROOT; };
@@ -4100,6 +4102,7 @@
 				279C756A219DDE3B001CD1CB /* FingerprintingProtection.swift */,
 				5E34780F22D7A1D200B0D5F8 /* ResourceDownloadManager.swift */,
 				5E4845C122DE3DF800372022 /* WindowRenderHelperScript.swift */,
+				0A19365323508756002E2B81 /* LinkPreviewViewController.swift */,
 			);
 			indentWidth = 4;
 			path = Browser;
@@ -5919,6 +5922,7 @@
 				DDA24A431FD84D630098F159 /* DefaultSearchPrefs.swift in Sources */,
 				4422D4B121BFFB7600BF1855 /* bloom.cc in Sources */,
 				4422D4FD21BFFB7600BF1855 /* dumpfile.cc in Sources */,
+				0A19365423508756002E2B81 /* LinkPreviewViewController.swift in Sources */,
 				E65075611E37F77D006961AC /* MenuHelper.swift in Sources */,
 				E63ED7D81BFCD9990097D08E /* LoginTableViewCell.swift in Sources */,
 				C615FACF2129FBD000A8168C /* ImageCacheProtocol.swift in Sources */,

Client/Application/ClientPreferences.swift

@@ -68,6 +68,8 @@ extension Preferences {
 
         /// The progress the user has made with onboarding
         static let basicOnboardingProgress = Option<Int>(key: "general.basic-onboarding-progress", default: OnboardingProgress.none.rawValue)
+        /// Whether or not link preview upon long press action should be shown.
+        static let enableLinkPreview = Option<Bool>(key: "general.night-mode", default: true)
     }
     final class Search {
         /// Whether or not to show suggestions while the user types

Client/Frontend/Browser/BrowserViewController.swift

@@ -2505,17 +2505,38 @@ extension BrowserViewController: WKUIDelegate {
 
                     actions.append(shareAction)
                 }
+
+                let linkPreview = Preferences.General.enableLinkPreview.value
+
+                let linkPreviewTitle = linkPreview ?
+                    Strings.HideLinkPreviewsActionTitle : Strings.ShowLinkPreviewsActionTitle
+                let linkPreviewAction = UIAction(title: linkPreviewTitle, image: UIImage(systemName: "eye.fill")) { _ in
+                    Preferences.General.enableLinkPreview.value.toggle()
+                }
 
+                actions.append(linkPreviewAction)
             }
 
             return UIMenu(title: url.absoluteString, children: actions)
         }
 
-        let config = UIContextMenuConfiguration(identifier: nil, previewProvider: nil, actionProvider: actionProvider)
+        let linkPreview: UIContextMenuContentPreviewProvider = {
+            return LinkPreviewViewController(url: url)
+        }
+
+        let linkPreviewProvider = Preferences.General.enableLinkPreview.value ? linkPreview : nil
+        let config = UIContextMenuConfiguration(identifier: nil, previewProvider: linkPreviewProvider,
+                                                actionProvider: actionProvider)
 
         completionHandler(config)
     }
 
+    @available(iOS 13.0, *)
+    func webView(_ webView: WKWebView, contextMenuForElement elementInfo: WKContextMenuElementInfo, willCommitWithAnimator animator: UIContextMenuInteractionCommitAnimating) {
+        guard let url = elementInfo.linkURL else { return }
+        webView.load(URLRequest(url: url))
+    }
+
     fileprivate func addTab(url: URL, inPrivateMode: Bool, currentTab: Tab) {
         let tab = self.tabManager.addTab(URLRequest(url: url), afterTab: currentTab, isPrivate: inPrivateMode)
         if inPrivateMode && !PrivateBrowsingManager.shared.isPrivateBrowsing {

Client/Frontend/Browser/LinkPreviewViewController.swift

@@ -0,0 +1,36 @@
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import UIKit
+import WebKit
+import Data
+
+class LinkPreviewViewController: UIViewController {
+
+    let url: URL
+
+    init(url: URL) {
+        self.url = url
+        super.init(nibName: nil, bundle: nil)
+    }
+
+    @available(*, unavailable)
+    required init?(coder aDecoder: NSCoder) { fatalError() }
+
+    override func viewDidLoad() {
+        let wk = WKWebView(frame: view.frame)
+
+        let domain = Domain.getOrCreate(forUrl: url, persistent: !PrivateBrowsingManager.shared.isPrivateBrowsing)
+
+        BlocklistName.blocklists(forDomain: domain).on.forEach {
+            ContentBlockerHelper.ruleStore.lookUpContentRuleList(forIdentifier: $0.filename) { rule, _ in
+                guard let rule = rule else { return }
+                wk.configuration.userContentController.add(rule)
+            }
+        }
+
+        view.addSubview(wk)
+        wk.load(URLRequest(url: url))
+    }
+}