Send "disappearing messages" state for contacts.

SignalServiceKit/src/Contacts/Threads/TSContactThread.h

@@ -1,5 +1,5 @@
 //
-//  Copyright (c) 2017 Open Whisper Systems. All rights reserved.
+//  Copyright (c) 2018 Open Whisper Systems. All rights reserved.
 //
 
 #import "TSThread.h"
@@ -19,6 +19,9 @@ NS_ASSUME_NONNULL_BEGIN
                                    transaction:(YapDatabaseReadWriteTransaction *)transaction
                                          relay:(nullable NSString *)relay;
 
+// Unlike getOrCreateThreadWithContactId, this will _NOT_ create a thread if one does not already exist.
++ (nullable instancetype)getThreadWithContactId:(NSString *)contactId;
+
 - (NSString *)contactIdentifier;
 
 + (NSString *)contactIdFromThreadId:(NSString *)threadId;

SignalServiceKit/src/Contacts/Threads/TSContactThread.m

@@ -1,5 +1,5 @@
 //
-//  Copyright (c) 2017 Open Whisper Systems. All rights reserved.
+//  Copyright (c) 2018 Open Whisper Systems. All rights reserved.
 //
 
 #import "TSContactThread.h"
@@ -83,6 +83,19 @@ NS_ASSUME_NONNULL_BEGIN
     return thread;
 }
 
++ (nullable instancetype)getThreadWithContactId:(NSString *)contactId
+{
+    OWSAssert(contactId.length > 0);
+
+    __block TSContactThread *_Nullable thread;
+    [[self dbReadWriteConnection] readWithBlock:^(YapDatabaseReadTransaction *transaction) {
+        thread =
+            [TSContactThread fetchObjectWithUniqueID:[self threadIdFromContactId:contactId] transaction:transaction];
+    }];
+
+    return thread;
+}
+
 - (NSString *)contactIdentifier {
     return [[self class] contactIdFromThreadId:self.uniqueId];
 }

SignalServiceKit/src/Devices/OWSContactsOutputStream.m

@@ -1,5 +1,5 @@
 //
-//  Copyright (c) 2017 Open Whisper Systems. All rights reserved.
+//  Copyright (c) 2018 Open Whisper Systems. All rights reserved.
 //
 
 #import "OWSContactsOutputStream.h"
@@ -7,9 +7,11 @@
 #import "Cryptography.h"
 #import "MIMETypeUtil.h"
 #import "NSData+keyVersionByte.h"
+#import "OWSDisappearingMessagesConfiguration.h"
 #import "OWSRecipientIdentity.h"
 #import "OWSSignalServiceProtos.pb.h"
 #import "SignalAccount.h"
+#import "TSContactThread.h"
 #import <ProtocolBuffers/CodedOutputStream.h>
 
 NS_ASSUME_NONNULL_BEGIN
@@ -51,6 +53,16 @@ NS_ASSUME_NONNULL_BEGIN
         [contactBuilder setProfileKey:profileKeyData];
     }
 
+    TSContactThread *_Nullable contactThread = [TSContactThread getThreadWithContactId:signalAccount.recipientId];
+    if (contactThread) {
+        OWSDisappearingMessagesConfiguration *_Nullable disappearingMessagesConfiguration =
+            [OWSDisappearingMessagesConfiguration fetchObjectWithUniqueID:contactThread.uniqueId];
+
+        if (disappearingMessagesConfiguration && disappearingMessagesConfiguration.isEnabled) {
+            [contactBuilder setExpireTimer:disappearingMessagesConfiguration.durationSeconds];
+        }
+    }
+
     NSData *contactData = [[contactBuilder build] data];
 
     uint32_t contactDataLength = (uint32_t)contactData.length;