React with thumbs up.

Signal/src/NotificationActionHandler.swift

@@ -131,6 +131,33 @@ class NotificationActionHandler {
             thread.markAllAsRead(updateStorageService: true, transaction: transaction)
         }
     }
+
+    func reactWithThumbsUp(userInfo: [AnyHashable: Any]) throws -> Promise<Void> {
+        guard let threadId = userInfo[AppNotificationUserInfoKey.threadId] as? String else {
+            throw NotificationError.failDebug("threadId was unexpectedly nil")
+        }
+        guard let messageId = userInfo[AppNotificationUserInfoKey.messageId] as? String else {
+            throw NotificationError.failDebug("messageId was unexpectedly nil")
+        }
+
+        return databaseStorage.write(.promise) { transaction in
+            guard let thread = TSThread.anyFetch(uniqueId: threadId, transaction: transaction) else {
+                throw NotificationError.failDebug("unable to find thread with id: \(threadId)")
+            }
+            guard let interaction = TSInteraction.anyFetch(uniqueId: messageId, transaction: transaction) else {
+                throw NotificationError.failDebug("unable to find interaction with id: \(messageId)")
+            }
+            guard let incomingMessage = interaction as? TSIncomingMessage else {
+                throw NotificationError.failDebug("Unexpected interaction type.")
+            }
+
+            ReactionManager.localUserReacted(to: incomingMessage, emoji: "👍", isRemoving: false, transaction: transaction)
+
+            let hasPendingMessageRequest = thread.hasPendingMessageRequest(transaction: transaction.unwrapGrdbWrite)
+            let readCircumstance: OWSReadCircumstance = (hasPendingMessageRequest ? .readOnThisDeviceWhilePendingMessageRequest : .readOnThisDevice)
+            incomingMessage.markAsRead(atTimestamp: NSDate.ows_millisecondTimeStamp(), thread: thread, circumstance: readCircumstance, transaction: transaction)
+        }
+    }
 }
 
 extension ThreadUtil {

Signal/src/UserNotificationActionHandler.swift

@@ -66,6 +66,8 @@ public class UserNotificationActionHandler: NSObject {
             return try actionHandler.reply(userInfo: userInfo, replyText: textInputResponse.userText)
         case .showThread:
             return try actionHandler.showThread(userInfo: userInfo)
+        case .reactWithThumbsUp:
+            return try actionHandler.reactWithThumbsUp(userInfo: userInfo)
         }
     }
 }

Signal/translations/en.lproj/Localizable.strings

@@ -3059,6 +3059,9 @@
 /* Notification action button title */
 "PUSH_MANAGER_MARKREAD" = "Mark as Read";
 
+/* Notification action button title for 'react with thumbs up.' */
+"PUSH_MANAGER_REACT_WITH_THUMBS_UP" = "React with 👍";
+
 /* Notification action button title */
 "PUSH_MANAGER_REPLY" = "Reply";
 

SignalMessaging/Notifications/AppNotifications.swift

@@ -40,6 +40,7 @@ public enum AppNotificationAction: CaseIterable {
     case markAsRead
     case reply
     case showThread
+    case reactWithThumbsUp
 }
 
 public struct AppNotificationUserInfoKey {
@@ -80,7 +81,11 @@ extension AppNotificationCategory {
     var actions: [AppNotificationAction] {
         switch self {
         case .incomingMessageWithActions:
-            return [.markAsRead, .reply]
+            if DebugFlags.reactWithThumbsUpFromLockscreen {
+                return [.reply, .reactWithThumbsUp]
+            } else {
+                return [.markAsRead, .reply]
+            }
         case .incomingMessageWithoutActions:
             return []
         case .incomingMessageFromNoLongerVerifiedIdentity:
@@ -118,6 +123,8 @@ extension AppNotificationAction {
             return "Signal.AppNotifications.Action.reply"
         case .showThread:
             return "Signal.AppNotifications.Action.showThread"
+        case .reactWithThumbsUp:
+            return "Signal.AppNotifications.Action.reactWithThumbsUp"
         }
     }
 }

SignalMessaging/Notifications/UserNotificationsAdaptee.swift

@@ -52,6 +52,10 @@ public class UserNotificationConfig {
             return UNNotificationAction(identifier: action.identifier,
                                         title: CallStrings.showThreadButtonTitle,
                                         options: [.foreground])
+        case .reactWithThumbsUp:
+            return UNNotificationAction(identifier: action.identifier,
+                                        title: MessageStrings.reactWithThumbsUpNotificationAction,
+                                        options: [])
         }
     }
 

SignalMessaging/Views/CommonStrings.swift

@@ -94,6 +94,9 @@ public class MessageStrings: NSObject {
     @objc
     static public let markAsReadNotificationAction = NSLocalizedString("PUSH_MANAGER_MARKREAD", comment: "Notification action button title")
 
+    @objc
+    static public let reactWithThumbsUpNotificationAction = NSLocalizedString("PUSH_MANAGER_REACT_WITH_THUMBS_UP", comment: "Notification action button title for 'react with thumbs up.'")
+
     @objc
     static public let sendButton =  NSLocalizedString("SEND_BUTTON_TITLE", comment: "Label for the button to send a message")
 

SignalServiceKit/src/Util/FeatureFlags.swift

@@ -413,6 +413,9 @@ public class DebugFlags: BaseFlags {
     @objc
     public static let forceVersionedProfiles = build.includes(.beta)
 
+    @objc
+    public static let reactWithThumbsUpFromLockscreen = build.includes(.qa)
+
     public static func buildFlagMap() -> [String: Any] {
         BaseFlags.buildFlagMap(for: DebugFlags.self) { (key: String) -> Any? in
             DebugFlags.value(forKey: key)