Hookup api.

Signal/src/AppDelegate.m

@@ -1489,7 +1489,7 @@ static NSTimeInterval launchStartedAt;
 
 - (LKGroupChat *)lokiPublicChat
 {
-    return [[LKGroupChat alloc] initWithServerID:@(LKGroupChatAPI.publicChatServerID).unsignedIntegerValue server:LKGroupChatAPI.publicChatServer displayName:NSLocalizedString(@"Loki Public Chat", @"") isDeletable:true];
+    return [[LKGroupChat alloc] initWithServerID:LKGroupChatAPI.publicChatServerID server:LKGroupChatAPI.publicChatServer displayName:NSLocalizedString(@"Loki Public Chat", @"") isDeletable:true];
 }
 
 - (LKRSSFeed *)lokiNewsFeed

Signal/src/ViewControllers/ConversationView/ConversationViewItem.m

@@ -9,6 +9,7 @@
 #import "OWSMessageHeaderView.h"
 #import "OWSSystemMessageCell.h"
 #import "Session-Swift.h"
+#import "AnyPromise.h"
 #import <SignalMessaging/OWSUnreadIndicator.h>
 #import <SignalServiceKit/NSData+Image.h>
 #import <SignalServiceKit/NSString+SSK.h>
@@ -1161,15 +1162,13 @@ NSString *NSStringForOWSMessageCellType(OWSMessageCellType cellType)
 
 - (void)deleteAction
 {
-    // TODO: Handle deletion differently for public chats
+    // Delete it optimistically
+    [self.interaction remove];
+    
     if (self.isGroupThread) {
+        // If it's RSS then skip
         TSGroupThread *groupThread = (TSGroupThread *)self.interaction.thread;
-        
-        // If it's RSS then just proceed normally
-        if (groupThread.isRSS) {
-            [self.interaction remove];
-            return;
-        };
+        if (groupThread.isRSS) return;
         
         // Only allow deletion on incoming and outgoing messages
         OWSInteractionType interationType = self.interaction.interactionType;
@@ -1179,13 +1178,12 @@ NSString *NSStringForOWSMessageCellType(OWSMessageCellType cellType)
         TSMessage *message = (TSMessage *)self.interaction;
         if (!message.isPublicChatMessage) return;
         
-        // TODO: Call the group api here to delete the message
-        
-        // Just return and don't delete for now
-        return;
+        // Delete the message
+        [[LKGroupChatAPI deleteMessageWithServerID:message.publicChatMessageID forGroup:LKGroupChatAPI.publicChatServerID onServer:LKGroupChatAPI.publicChatServer isOurOwnMessage:interationType == OWSInteractionType_OutgoingMessage].catch(^(NSError *error) {
+            // If we fail then add the interaction back in
+            [self.interaction save];
+        }) retainUntilComplete];
     }
-    
-    [self.interaction remove];
 }
 
 - (BOOL)hasBodyTextActionContent

SignalServiceKit/src/Loki/API/LokiGroupChatAPI.swift

@@ -11,7 +11,7 @@ public final class LokiGroupChatAPI : NSObject {
     // MARK: Public Chat
     @objc public static let publicChatServer = "https://chat.lokinet.org"
     @objc public static let publicChatMessageType = "network.loki.messenger.publicChat"
-    @objc public static let publicChatServerID = 1
+    @objc public static let publicChatServerID: UInt = 1
     
     // MARK: Convenience
     private static var userDisplayName: String {
@@ -205,6 +205,31 @@ public final class LokiGroupChatAPI : NSObject {
         }
     }
     
+    public static func deleteMessageWithServerID(_ messageServerID: UInt, for group: UInt64, on server: String, isOurOwnMessage: Bool = true) -> Promise<Void> {
+        return getAuthToken(for: server).then { token -> Promise<Void> in
+            let modTag = isOurOwnMessage ? "" : "[Mod]"
+            print("[Loki]\(modTag) Deleting message with server ID: \(messageServerID) for group chat with ID: \(group) on server: \(server).")
+        
+            let endpoint = isOurOwnMessage ? "\(server)/channels/\(group)/messages/\(messageServerID)" : "\(server)/loki/v1/moderation/message/\(messageServerID)"
+            let url = URL(string: endpoint)!
+            let request = TSRequest(url: url, method: "DELETE", parameters: [:])
+            request.allHTTPHeaderFields = [ "Content-Type" : "application/json", "Authorization" : "Bearer \(token)" ]
+            return TSNetworkManager.shared().makePromise(request: request).map { result -> Void in
+                print("[Loki]\(modTag) Deleted message \(messageServerID) on server \(server).")
+            }.recover { error in
+                 // If we got 404 or 410 then message doesn't exist on the server
+                if let error = error as? NetworkManagerError, error.statusCode == 404 || error.statusCode == 410 {
+                    print("[Loki]\(modTag) Message \(messageServerID) was already deleted on the server.")
+                    return
+                }
+
+                print("[Loki]\(modTag) Failed to delete message \(messageServerID) on server \(server).")
+                throw error
+            }
+        }
+       
+    }
+    
     // MARK: Public API (Obj-C)
     @objc(getMessagesForGroup:onServer:)
     public static func objc_getMessages(for group: UInt64, on server: String) -> AnyPromise {
@@ -215,4 +240,9 @@ public final class LokiGroupChatAPI : NSObject {
     public static func objc_sendMessage(_ message: LokiGroupMessage, to group: UInt64, on server: String) -> AnyPromise {
         return AnyPromise.from(sendMessage(message, to: group, on: server))
     }
+    
+    @objc (deleteMessageWithServerID:forGroup:onServer:isOurOwnMessage:)
+    public static func objc_deleteMessageWithServerID(_ messageServerID: UInt, for group: UInt64, on server: String, ourMessage: Bool = true) -> AnyPromise {
+        return AnyPromise.from(deleteMessageWithServerID(messageServerID, for: group, on: server, isOurOwnMessage: ourMessage))
+    }
 }