Show the delete action in public chats.

Signal/src/Models/MessageActions.swift

@@ -86,7 +86,7 @@ class ConversationViewItemActions: NSObject {
             actions.append(copyTextAction)
         }
 
-        if !isGroup {
+        if !isGroup || conversationViewItem.canDeleteGroupMessage {
             let deleteAction = MessageActionBuilder.deleteMessage(conversationViewItem: conversationViewItem, delegate: delegate)
             actions.append(deleteAction)
         }

Signal/src/ViewControllers/ColorPickerViewController.swift

@@ -305,6 +305,8 @@ class ColorPickerView: UIView, ColorViewDelegate {
 
 @objc
 private class MockConversationViewItem: NSObject, ConversationViewItem {
+    var canDeleteGroupMessage: Bool = false
+    
     var interaction: TSInteraction = TSMessage()
     var interactionType: OWSInteractionType = OWSInteractionType.unknown
     var quotedReply: OWSQuotedReplyModel?

Signal/src/ViewControllers/ConversationView/ConversationViewItem.h

@@ -67,6 +67,7 @@ NSString *NSStringForOWSMessageCellType(OWSMessageCellType cellType);
 @property (nonatomic, readonly, nullable) OWSQuotedReplyModel *quotedReply;
 
 @property (nonatomic, readonly) BOOL isGroupThread;
+@property (nonatomic, readonly) BOOL canDeleteGroupMessage;
 
 @property (nonatomic, readonly) BOOL hasBodyText;
 

Signal/src/ViewControllers/ConversationView/ConversationViewItem.m

@@ -1161,6 +1161,30 @@ NSString *NSStringForOWSMessageCellType(OWSMessageCellType cellType)
 
 - (void)deleteAction
 {
+    // TODO: Handle deletion differently for public chats
+    if (self.isGroupThread) {
+        TSGroupThread *groupThread = (TSGroupThread *)self.interaction.thread;
+        
+        // If it's RSS then just proceed normally
+        if (groupThread.isRSS) {
+            [self.interaction remove];
+            return;
+        };
+        
+        // Only allow deletion on incoming and outgoing messages
+        OWSInteractionType interationType = self.interaction.interactionType;
+        if (interationType != OWSInteractionType_OutgoingMessage && interationType != OWSInteractionType_IncomingMessage) return;
+        
+        // Check that we have the server id for the message
+        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;
+    }
+    
     [self.interaction remove];
 }
 
@@ -1204,6 +1228,27 @@ NSString *NSStringForOWSMessageCellType(OWSMessageCellType cellType)
     return NO;
 }
 
+- (BOOL)canDeleteGroupMessage
+{
+    if (!self.isGroupThread) return false;
+    
+    // Make sure it's a public chat and not an rss feed
+    TSGroupThread *groupThread = (TSGroupThread *)self.interaction.thread;
+    if (groupThread.isRSS) return false;
+    
+    // Only allow deletion on incoming and outgoing messages
+    OWSInteractionType interationType = self.interaction.interactionType;
+    if (interationType != OWSInteractionType_OutgoingMessage && interationType != OWSInteractionType_IncomingMessage) return false;
+    
+    // Make sure it's a public chat message
+    TSMessage *message = (TSMessage *)self.interaction;
+    if (!message.isPublicChatMessage) return false;
+    
+    // TODO: Disable deletion of incoming messages if we're not moderators
+
+    return true;
+}
+
 @end
 
 NS_ASSUME_NONNULL_END

SignalServiceKit/src/Contacts/Threads/TSGroupThread.h

@@ -16,6 +16,7 @@ extern NSString *const TSGroupThread_NotificationKey_UniqueId;
 @interface TSGroupThread : TSThread
 
 @property (nonatomic, strong) TSGroupModel *groupModel;
+@property (nonatomic, readonly) BOOL isRSS;
 
 + (instancetype)getOrCreateThreadWithGroupModel:(TSGroupModel *)groupModel;
 + (instancetype)getOrCreateThreadWithGroupModel:(TSGroupModel *)groupModel

SignalServiceKit/src/Contacts/Threads/TSGroupThread.m

@@ -266,6 +266,12 @@ NSString *const TSGroupThread_NotificationKey_UniqueId = @"TSGroupThread_Notific
     return [self.class stableColorNameForNewConversationWithString:[self threadIdFromGroupId:groupId]];
 }
 
+- (BOOL)isRSS
+{
+    NSString *groupID = [[NSString alloc] initWithData:self.groupModel.groupId encoding:NSUTF8StringEncoding];
+    return groupID != nil && [groupID containsString:@"rss:"];
+}
+
 @end
 
 NS_ASSUME_NONNULL_END

SignalServiceKit/src/Loki/API/LokiRSSFeed.swift

@@ -7,7 +7,7 @@ public final class LokiRSSFeed : NSObject {
     @objc public let isDeletable: Bool
     
     @objc public init(id: String, server: String, displayName: String, isDeletable: Bool) {
-        self.id = id
+        self.id = "rss://\(id)"
         self.server = server
         self.displayName = displayName
         self.isDeletable = isDeletable