Made LKAddressMessage a subclass of LKEphemeralMessage.

This is because we can't send a body with a nil message :(

SignalServiceKit/src/Loki/API/LokiAPI.swift

@@ -82,6 +82,7 @@ import PromiseKit
         var p2pPromise: Promise<Set<Promise<RawResponse>>> = Promise(error: Error.internalError)
         // TODO: probably only send to p2p if user is online or we are pinging them
         // p2pDetails && (isPing || peerIsOnline)
+
         if let p2pDetails = contactP2PDetails[destination] {
             p2pPromise = sendMessage(message, targets: [p2pDetails])
         }

SignalServiceKit/src/Loki/Messages/LKAddressMessage.h

@@ -1,13 +1,10 @@
-//
-//  Copyright (c) 2018 Open Whisper Systems. All rights reserved.
-// 
 
-#import <SignalServiceKit/SignalServiceKit.h>
+#import "LKEphemeralMessage.h"
 
 NS_ASSUME_NONNULL_BEGIN
 
 NS_SWIFT_NAME(LokiAddressMessage)
-@interface LKAddressMessage : TSOutgoingMessage
+@interface LKAddressMessage : LKEphemeralMessage
 
 - (instancetype)initInThread:(nullable TSThread *)thread
                                    address:(NSString *)address

SignalServiceKit/src/Loki/Messages/LKAddressMessage.m

@@ -12,12 +12,11 @@
 
 @implementation LKAddressMessage
 
-- (instancetype)initAddressMessageInThread:(nullable TSThread *)thread
-                                   address:(NSString *)address
-                                      port:(uint)port
+- (instancetype)initInThread:(nullable TSThread *)thread
+                     address:(NSString *)address
+                        port:(uint)port
 {
-    self = [super initOutgoingMessageWithTimestamp:NSDate.ows_millisecondTimeStamp inThread:thread messageBody:nil attachmentIds:[NSMutableArray<NSString *> new]
-                                  expiresInSeconds:0 expireStartedAt:0 isVoiceMessage:NO groupMetaMessage:TSGroupMetaMessageUnspecified quotedMessage:nil contactShare:nil linkPreview:nil];
+    self = [super initInThread:thread];
     if (!self) {
         return self;
     }
@@ -47,13 +46,6 @@
     return contentBuilder;
 }
 
-// We don't need to send any data message in this address message
-- (nullable SSKProtoDataMessage *)buildDataMessage:(NSString *_Nullable)recipientId {
-    return nil;
-}
-
-- (BOOL)shouldBeSaved { return false; }
-
 - (uint)ttl {
     // Address messages should only last 1 minute
     return 1 * kMinuteInterval;

SignalServiceKit/src/Loki/Messages/LKEphemeralMessage.h

@@ -8,6 +8,8 @@ NS_SWIFT_NAME(EphemeralMessage)
 /// Used to establish sessions.
 + (LKEphemeralMessage *)createEmptyOutgoingMessageInThread:(TSThread *)thread;
 
+- (instancetype)initInThread:(nullable TSThread *)thread;
+
 @end
 
 NS_ASSUME_NONNULL_END

SignalServiceKit/src/Loki/Messages/LKEphemeralMessage.m

@@ -4,8 +4,12 @@
 @implementation LKEphemeralMessage
 
 + (LKEphemeralMessage *)createEmptyOutgoingMessageInThread:(TSThread *)thread {
-    return [[LKEphemeralMessage alloc] initOutgoingMessageWithTimestamp:NSDate.ows_millisecondTimeStamp inThread:thread messageBody:@"" attachmentIds:[NSMutableArray<NSString *> new]
-        expiresInSeconds:0 expireStartedAt:0 isVoiceMessage:NO groupMetaMessage:TSGroupMetaMessageUnspecified quotedMessage:nil contactShare:nil linkPreview:nil];
+    return [[LKEphemeralMessage alloc] initInThread:thread];
+}
+
+- (instancetype)initInThread:(nullable TSThread *)thread {
+    return [self initOutgoingMessageWithTimestamp:NSDate.ows_millisecondTimeStamp inThread:thread messageBody:@"" attachmentIds:[NSMutableArray<NSString *> new]
+                                 expiresInSeconds:0 expireStartedAt:0 isVoiceMessage:NO groupMetaMessage:TSGroupMetaMessageUnspecified quotedMessage:nil contactShare:nil linkPreview:nil];
 }
 
 - (BOOL)shouldBeSaved { return NO; }