Add SignalAccount class.

// FREEBIE

src/Contacts/Contact.h

@@ -29,6 +29,7 @@ typedef NS_ENUM(NSUInteger, OWSPhoneNumberType) {
 @class PhoneNumber;
 @class UIImage;
 @class SignalRecipient;
+@class YapDatabaseReadTransaction;
 
 @interface Contact : NSObject
 
@@ -48,7 +49,7 @@ typedef NS_ENUM(NSUInteger, OWSPhoneNumberType) {
 #endif // TARGET_OS_IOS
 
 - (BOOL)isSignalContact;
-- (NSArray<SignalRecipient *> *)signalRecipients;
+- (NSArray<SignalRecipient *> *)signalRecipientsWithTransaction:(YapDatabaseReadTransaction *)transaction;
 // TODO: Remove this method.
 - (NSArray<NSString *> *)textSecureIdentifiers;
 

src/Contacts/Contact.m

@@ -202,19 +202,18 @@ NS_ASSUME_NONNULL_BEGIN
     return [identifiers count] > 0;
 }
 
-- (NSArray<SignalRecipient *> *)signalRecipients
+- (NSArray<SignalRecipient *> *)signalRecipientsWithTransaction:(YapDatabaseReadTransaction *)transaction
 {
     __block NSMutableArray *result = [NSMutableArray array];
 
-    [[TSStorageManager sharedManager].dbConnection readWithBlock:^(YapDatabaseReadTransaction *transaction) {
-        for (PhoneNumber *number in [self.parsedPhoneNumbers sortedArrayUsingSelector:@selector(compare:)]) {
-            SignalRecipient *signalRecipient =
-                [SignalRecipient recipientWithTextSecureIdentifier:number.toE164 withTransaction:transaction];
-            if (signalRecipient) {
-                [result addObject:signalRecipient];
-            }
+    for (PhoneNumber *number in [self.parsedPhoneNumbers sortedArrayUsingSelector:@selector(compare:)]) {
+        SignalRecipient *signalRecipient =
+            [SignalRecipient recipientWithTextSecureIdentifier:number.toE164 withTransaction:transaction];
+        if (signalRecipient) {
+            [result addObject:signalRecipient];
         }
-    }];
+    }
+
     return [result copy];
 }
 

src/Contacts/SignalRecipient.h

@@ -27,6 +27,10 @@ NS_ASSUME_NONNULL_BEGIN
 // This property indicates support for both WebRTC audio and video calls.
 - (BOOL)supportsWebRTC;
 
+- (NSString *)recipientId;
+
+- (NSComparisonResult)compare:(SignalRecipient *)other;
+
 @end
 
 NS_ASSUME_NONNULL_END

src/Contacts/SignalRecipient.m

@@ -83,6 +83,16 @@ NS_ASSUME_NONNULL_BEGIN
     return YES;
 }
 
+- (NSString *)recipientId
+{
+    return self.uniqueId;
+}
+
+- (NSComparisonResult)compare:(SignalRecipient *)other
+{
+    return [self.recipientId compare:other.recipientId];
+}
+
 @end
 
 NS_ASSUME_NONNULL_END