store hash value for outgoing messages

SessionMessagingKit/Messages/Message.swift

@@ -11,6 +11,7 @@ public class Message : NSObject, NSCoding { // NSObject/NSCoding conformance is
     public var groupPublicKey: String?
     public var openGroupServerMessageID: UInt64?
     public var openGroupServerTimestamp: UInt64?
+    public var serverHash: String?
 
     public var ttl: UInt64 { 14 * 24 * 60 * 60 * 1000 }
     public var isSelfSendValid: Bool { false }
@@ -35,6 +36,7 @@ public class Message : NSObject, NSCoding { // NSObject/NSCoding conformance is
         if let groupPublicKey = coder.decodeObject(forKey: "groupPublicKey") as! String? { self.groupPublicKey = groupPublicKey }
         if let openGroupServerMessageID = coder.decodeObject(forKey: "openGroupServerMessageID") as! UInt64? { self.openGroupServerMessageID = openGroupServerMessageID }
         if let openGroupServerTimestamp = coder.decodeObject(forKey: "openGroupServerTimestamp") as! UInt64? { self.openGroupServerTimestamp = openGroupServerTimestamp }
+        if let serverHash = coder.decodeObject(forKey: "serverHash") as! String? { self.serverHash = serverHash }
     }
 
     public func encode(with coder: NSCoder) {
@@ -47,6 +49,7 @@ public class Message : NSObject, NSCoding { // NSObject/NSCoding conformance is
         coder.encode(groupPublicKey, forKey: "groupPublicKey")
         coder.encode(openGroupServerMessageID, forKey: "openGroupServerMessageID")
         coder.encode(openGroupServerTimestamp, forKey: "openGroupServerTimestamp")
+        coder.encode(serverHash, forKey: "serverHash")
     }
 
     // MARK: Proto Conversion

SessionMessagingKit/Messages/Signal/TSMessage.h

@@ -38,6 +38,7 @@ extern const NSUInteger kOversizeTextMessageSizeThreshold;
 @property (nonatomic, readonly) BOOL isOpenGroupMessage;
 @property (nonatomic, readonly, nullable) NSString *openGroupInvitationName;
 @property (nonatomic, readonly, nullable) NSString *openGroupInvitationURL;
+@property (nonatomic, nullable) NSString *serverHash;
 
 - (instancetype)initInteractionWithTimestamp:(uint64_t)timestamp inThread:(TSThread *)thread NS_UNAVAILABLE;
 

SessionMessagingKit/Messages/Signal/TSMessage.m

@@ -84,6 +84,7 @@ const NSUInteger kOversizeTextMessageSizeThreshold = 2 * 1024;
     _openGroupServerMessageID = 0;
     _openGroupInvitationName = openGroupInvitationName;
     _openGroupInvitationURL = openGroupInvitationURL;
+    _serverHash = nil;
 
     return self;
 }

SessionMessagingKit/Sending & Receiving/MessageSender.swift

@@ -208,10 +208,13 @@ public final class MessageSender : NSObject {
             let promiseCount = promises.count
             var errorCount = 0
             promises.forEach {
-                let _ = $0.done(on: DispatchQueue.global(qos: .userInitiated)) { _ in
+                let _ = $0.done(on: DispatchQueue.global(qos: .userInitiated)) { rawResponse in
                     guard !isSuccess else { return } // Succeed as soon as the first promise succeeds
                     isSuccess = true
                     storage.write(with: { transaction in
+                        let json = rawResponse as? JSON
+                        let hash = json?["hash"] as? String
+                        message.serverHash = hash
                         MessageSender.handleSuccessfulMessageSend(message, to: destination, isSyncMessage: isSyncMessage, using: transaction)
                         var shouldNotify = ((message is VisibleMessage || message is UnsendRequest) && !isSyncMessage)
                         /*
@@ -329,6 +332,7 @@ public final class MessageSender : NSObject {
         Storage.shared.addReceivedMessageTimestamp(message.sentTimestamp!, using: transaction)
         // Get the visible message if possible
         if let tsMessage = TSOutgoingMessage.find(withTimestamp: message.sentTimestamp!) {
+            tsMessage.serverHash = message.serverHash
             // Track the open group server message ID
             tsMessage.openGroupServerMessageID = message.openGroupServerMessageID ?? 0
             tsMessage.save(with: transaction)

SessionSnodeKit/SnodeAPI.swift

@@ -454,6 +454,8 @@ public final class SnodeAPI : NSObject {
         return promise
     }
     
+//    public static func deleteMessage() -> Promise
+    
     /// Clears all the user's data from their swarm. Returns a dictionary of snode public key to deletion confirmation.
     public static func clearAllData() -> Promise<[String:Bool]> {
         let storage = SNSnodeKitConfiguration.shared.storage