Be more explicit about expire timer.

SignalServiceKit/src/Devices/OWSContactsOutputStream.m

@@ -54,6 +54,11 @@ NS_ASSUME_NONNULL_BEGIN
         [contactBuilder setProfileKey:profileKeyData];
     }
 
+    // Always ensure the "expire timer" property is set so that desktop
+    // can easily distinguish between a modern client declaring "off" vs a
+    // legacy client "not specifying".
+    [contactBuilder setExpireTimer:0];
+
     TSContactThread *_Nullable contactThread = [TSContactThread getThreadWithContactId:signalAccount.recipientId];
     if (contactThread) {
         OWSDisappearingMessagesConfiguration *_Nullable disappearingMessagesConfiguration =
@@ -61,11 +66,6 @@ NS_ASSUME_NONNULL_BEGIN
 
         if (disappearingMessagesConfiguration && disappearingMessagesConfiguration.isEnabled) {
             [contactBuilder setExpireTimer:disappearingMessagesConfiguration.durationSeconds];
-        } else {
-            // Rather than *not* set the field, we expicitly set it to 0 so desktop
-            // can easily distinguish between a modern client declaring "off" vs a
-            // legacy client "not specifying".
-            [contactBuilder setExpireTimer:0];
         }
     }
 

SignalServiceKit/src/Devices/OWSGroupsOutputStream.h

@@ -6,12 +6,12 @@
 
 NS_ASSUME_NONNULL_BEGIN
 
-@class TSGroupModel;
+@class TSGroupThread;
 @class YapDatabaseReadTransaction;
 
 @interface OWSGroupsOutputStream : OWSChunkedOutputStream
 
-- (void)writeGroup:(TSGroupModel *)group transaction:(YapDatabaseReadTransaction *)transaction;
+- (void)writeGroup:(TSGroupThread *)groupThread transaction:(YapDatabaseReadTransaction *)transaction;
 
 @end
 

SignalServiceKit/src/Devices/OWSGroupsOutputStream.m

@@ -14,11 +14,14 @@ NS_ASSUME_NONNULL_BEGIN
 
 @implementation OWSGroupsOutputStream
 
-- (void)writeGroup:(TSGroupModel *)group transaction:(YapDatabaseReadTransaction *)transaction
+- (void)writeGroup:(TSGroupThread *)groupThread transaction:(YapDatabaseReadTransaction *)transaction
 {
-    OWSAssert(group);
+    OWSAssert(groupThread);
     OWSAssert(transaction);
 
+    TSGroupModel *group = groupThread.groupModel;
+    OWSAssert(group);
+
     OWSSignalServiceProtosGroupDetailsBuilder *groupBuilder = [OWSSignalServiceProtosGroupDetailsBuilder new];
     [groupBuilder setId:group.groupId];
     [groupBuilder setName:group.groupName];
@@ -35,19 +38,16 @@ NS_ASSUME_NONNULL_BEGIN
         [groupBuilder setAvatarBuilder:avatarBuilder];
     }
 
-    TSGroupThread *_Nullable groupThread = [TSGroupThread threadWithGroupId:group.groupId transaction:transaction];
-    if (groupThread) {
-        OWSDisappearingMessagesConfiguration *_Nullable disappearingMessagesConfiguration =
-            [OWSDisappearingMessagesConfiguration fetchObjectWithUniqueID:groupThread.uniqueId transaction:transaction];
+    OWSDisappearingMessagesConfiguration *_Nullable disappearingMessagesConfiguration =
+        [OWSDisappearingMessagesConfiguration fetchObjectWithUniqueID:groupThread.uniqueId transaction:transaction];
 
-        if (disappearingMessagesConfiguration && disappearingMessagesConfiguration.isEnabled) {
-            [groupBuilder setExpireTimer:disappearingMessagesConfiguration.durationSeconds];
-        } else {
-            // Rather than *not* set the field, we expicitly set it to 0 so desktop
-            // can easily distinguish between a modern client declaring "off" vs a
-            // legacy client "not specifying".
-            [groupBuilder setExpireTimer:0];
-        }
+    if (disappearingMessagesConfiguration && disappearingMessagesConfiguration.isEnabled) {
+        [groupBuilder setExpireTimer:disappearingMessagesConfiguration.durationSeconds];
+    } else {
+        // Rather than *not* set the field, we expicitly set it to 0 so desktop
+        // can easily distinguish between a modern client declaring "off" vs a
+        // legacy client "not specifying".
+        [groupBuilder setExpireTimer:0];
     }
 
     NSData *groupData = [[groupBuilder build] data];

SignalServiceKit/src/Messages/DeviceSyncing/OWSSyncGroupsMessage.m

@@ -56,8 +56,8 @@ NS_ASSUME_NONNULL_BEGIN
                                                DDLogVerbose(@"Ignoring non group thread in thread collection: %@", obj);
                                                return;
                                            }
-                                           TSGroupModel *group = ((TSGroupThread *)obj).groupModel;
-                                           [groupsOutputStream writeGroup:group transaction:transaction];
+                                           TSGroupThread *groupThread = (TSGroupThread *)obj;
+                                           [groupsOutputStream writeGroup:groupThread transaction:transaction];
                                        }];
 
     [groupsOutputStream flush];