Link previews migration.

Signal.xcodeproj/project.pbxproj

@@ -298,6 +298,7 @@
 		34EA69422194DE8000702471 /* MediaUploadView.swift in Sources */ = {isa = PBXBuildFile; fileRef = 34EA69412194DE7F00702471 /* MediaUploadView.swift */; };
 		34F308A21ECB469700BB7697 /* OWSBezierPathView.m in Sources */ = {isa = PBXBuildFile; fileRef = 34F308A11ECB469700BB7697 /* OWSBezierPathView.m */; };
 		34FDB29221FF986600A01202 /* UIView+OWS.swift in Sources */ = {isa = PBXBuildFile; fileRef = 34FDB29121FF986600A01202 /* UIView+OWS.swift */; };
+		34FDB2942200974600A01202 /* OWS115LinkPreviewsMigration.swift in Sources */ = {isa = PBXBuildFile; fileRef = 34FDB2932200974600A01202 /* OWS115LinkPreviewsMigration.swift */; };
 		4503F1BE20470A5B00CEE724 /* classic-quiet.aifc in Resources */ = {isa = PBXBuildFile; fileRef = 4503F1BB20470A5B00CEE724 /* classic-quiet.aifc */; };
 		4503F1BF20470A5B00CEE724 /* classic.aifc in Resources */ = {isa = PBXBuildFile; fileRef = 4503F1BC20470A5B00CEE724 /* classic.aifc */; };
 		4503F1C3204711D300CEE724 /* OWS107LegacySounds.m in Sources */ = {isa = PBXBuildFile; fileRef = 4503F1C1204711D200CEE724 /* OWS107LegacySounds.m */; };
@@ -1014,6 +1015,7 @@
 		34F308A01ECB469700BB7697 /* OWSBezierPathView.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = OWSBezierPathView.h; sourceTree = "<group>"; };
 		34F308A11ECB469700BB7697 /* OWSBezierPathView.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = OWSBezierPathView.m; sourceTree = "<group>"; };
 		34FDB29121FF986600A01202 /* UIView+OWS.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = "UIView+OWS.swift"; sourceTree = "<group>"; };
+		34FDB2932200974600A01202 /* OWS115LinkPreviewsMigration.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = OWS115LinkPreviewsMigration.swift; sourceTree = "<group>"; };
 		435EAC2E5E22D3F087EB3192 /* Pods-SignalShareExtension.app store release.xcconfig */ = {isa = PBXFileReference; includeInIndex = 1; lastKnownFileType = text.xcconfig; name = "Pods-SignalShareExtension.app store release.xcconfig"; path = "Pods/Target Support Files/Pods-SignalShareExtension/Pods-SignalShareExtension.app store release.xcconfig"; sourceTree = "<group>"; };
 		4503F1BB20470A5B00CEE724 /* classic-quiet.aifc */ = {isa = PBXFileReference; lastKnownFileType = file; path = "classic-quiet.aifc"; sourceTree = "<group>"; };
 		4503F1BC20470A5B00CEE724 /* classic.aifc */ = {isa = PBXFileReference; lastKnownFileType = file; path = classic.aifc; sourceTree = "<group>"; };
@@ -1680,6 +1682,7 @@
 				34B6A908218B8824007C4606 /* OWS112TypingIndicatorsMigration.swift */,
 				4C7537882193779700DF5E37 /* OWS113MultiAttachmentMediaMessages.swift */,
 				34BEDB0A21C2FA3D007B0EAE /* OWS114RemoveDynamicInteractions.swift */,
+				34FDB2932200974600A01202 /* OWS115LinkPreviewsMigration.swift */,
 				346129931FD1E30000532771 /* OWSDatabaseMigration.h */,
 				346129941FD1E30000532771 /* OWSDatabaseMigration.m */,
 				346129E51FD5C0C600532771 /* OWSDatabaseMigrationRunner.h */,
@@ -3411,6 +3414,7 @@
 				346129AF1FD1F5D900532771 /* SystemContactsFetcher.swift in Sources */,
 				34AC09E3211B39B100997B47 /* OWSViewController.m in Sources */,
 				346129C81FD2072E00532771 /* NSAttributedString+OWS.m in Sources */,
+				34FDB2942200974600A01202 /* OWS115LinkPreviewsMigration.swift in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};

SignalMessaging/environment/migrations/OWS115LinkPreviewsMigration.swift

@@ -0,0 +1,49 @@
+//
+//  Copyright (c) 2019 Open Whisper Systems. All rights reserved.
+//
+
+import Foundation
+import SignalServiceKit
+
+@objc
+public class OWS115LinkPreviewsMigration: OWSDatabaseMigration {
+
+    // MARK: - Dependencies
+
+    private var typingIndicators: TypingIndicators {
+        return SSKEnvironment.shared.typingIndicators
+    }
+
+    // MARK: -
+
+    // Increment a similar constant for each migration.
+    @objc
+    class func migrationId() -> String {
+        return "115"
+    }
+
+    override public func runUp(completion: @escaping OWSDatabaseMigrationCompletion) {
+        Logger.debug("")
+        BenchAsync(title: "Link Previews Migration") { (benchCompletion) in
+            self.doMigrationAsync(completion: {
+                benchCompletion()
+                completion()
+            })
+        }
+    }
+
+    private func doMigrationAsync(completion : @escaping OWSDatabaseMigrationCompletion) {
+        DispatchQueue.main.async {
+            // Link Previews should be disabled by default for legacy users.
+            SSKPreferences.setAreLinkPreviewsEnabled(value: false)
+
+            DispatchQueue.global().async {
+                self.dbReadWriteConnection().readWrite { transaction in
+                    self.save(with: transaction)
+                }
+
+                completion()
+            }
+        }
+    }
+}

SignalMessaging/environment/migrations/OWSDatabaseMigrationRunner.m

@@ -48,6 +48,7 @@ NS_ASSUME_NONNULL_BEGIN
         [[OWS112TypingIndicatorsMigration alloc] init],
         [[OWS113MultiAttachmentMediaMessages alloc] init],
         [[OWS114RemoveDynamicInteractions alloc] init],
+        [[OWS115LinkPreviewsMigration alloc] init],
     ];
 }