callback handlers for remote attestation

SignalServiceKit/src/Contacts/ContactDiscoveryService.h

@@ -4,6 +4,8 @@
 
 NS_ASSUME_NONNULL_BEGIN
 
+@class RemoteAttestation;
+
 @interface ContactDiscoveryService : NSObject
 
 - (instancetype)init NS_UNAVAILABLE;
@@ -11,7 +13,8 @@ NS_ASSUME_NONNULL_BEGIN
 + (instancetype)sharedService;
 
 - (void)testService;
-
+- (void)performRemoteAttestationWithSuccess:(void (^)(RemoteAttestation *_Nonnull remoteAttestation))successHandler
+                                    failure:(void (^)(NSError *_Nonnull error))failureHandler;
 @end
 
 NS_ASSUME_NONNULL_END

SignalServiceKit/src/Contacts/ContactDiscoveryService.m

@@ -8,6 +8,7 @@
 #import "Cryptography.h"
 #import "NSData+OWS.h"
 #import "NSDate+OWS.h"
+#import "OWSError.h"
 #import "OWSRequestFactory.h"
 #import "TSNetworkManager.h"
 #import <Curve25519Kit/Curve25519.h>
@@ -219,34 +220,48 @@ NS_ASSUME_NONNULL_BEGIN
 - (void)testService
 {
     dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
-        [self performRemoteAttestation];
+        [self
+            performRemoteAttestationWithSuccess:^(RemoteAttestation *_Nonnull remoteAttestation) {
+                DDLogDebug(@"%@ in %s succeeded", self.logTag, __PRETTY_FUNCTION__);
+            }
+            failure:^(NSError *_Nonnull error) {
+                DDLogDebug(@"%@ in %s failed with error: %@", self.logTag, __PRETTY_FUNCTION__, error);
+            }];
     });
 }
 
-- (void)performRemoteAttestation
+- (void)performRemoteAttestationWithSuccess:(void (^)(RemoteAttestation *_Nonnull remoteAttestation))successHandler
+                                    failure:(void (^)(NSError *_Nonnull error))failureHandler
 {
-    [self performRemoteAttestationAuth];
+    [self
+        getRemoteAttestationAuthWithSuccess:^(RemoteAttestationAuth *_Nonnull auth) {
+            [self performRemoteAttestationWithAuth:auth success:successHandler failure:failureHandler];
+        }
+                                    failure:failureHandler];
 }
 
-// TODO: Add success and failure?
-- (void)performRemoteAttestationAuth
+- (void)getRemoteAttestationAuthWithSuccess:(void (^)(RemoteAttestationAuth *))successHandler
+                                    failure:(void (^)(NSError *_Nonnull error))failureHandler
 {
     TSRequest *request = [OWSRequestFactory remoteAttestationAuthRequest];
     [[TSNetworkManager sharedManager] makeRequest:request
         success:^(NSURLSessionDataTask *task, id responseDict) {
-
             dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
                 RemoteAttestationAuth *_Nullable auth = [self parseAuthToken:responseDict];
                 if (!auth) {
                     DDLogError(@"%@ remote attestation auth could not be parsed: %@", self.logTag, responseDict);
+                    NSError *error = OWSErrorMakeUnableToProcessServerResponseError();
+                    failureHandler(error);
                     return;
                 }
-                [self performRemoteAttestationWithAuth:auth];
+
+                successHandler(auth);
             });
         }
         failure:^(NSURLSessionDataTask *task, NSError *error) {
             NSHTTPURLResponse *response = (NSHTTPURLResponse *)task.response;
             DDLogVerbose(@"%@ remote attestation auth failure: %zd", self.logTag, response.statusCode);
+            failureHandler(error);
         }];
 }
 
@@ -276,6 +291,8 @@ NS_ASSUME_NONNULL_BEGIN
 }
 
 - (void)performRemoteAttestationWithAuth:(RemoteAttestationAuth *)auth
+                                 success:(void (^)(RemoteAttestation *_Nonnull remoteAttestation))successHandler
+                                 failure:(void (^)(NSError *_Nonnull error))failureHandler
 {
     ECKeyPair *keyPair = [Curve25519 generateKeyPair];
 
@@ -290,15 +307,24 @@ NS_ASSUME_NONNULL_BEGIN
         success:^(NSURLSessionDataTask *task, id responseJson) {
             dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
                 // TODO: Handle result.
-                [self parseAttestationResponseJson:responseJson
-                                          response:task.response
-                                           keyPair:keyPair
-                                         enclaveId:enclaveId];
+                RemoteAttestation *_Nullable attestation = [self parseAttestationResponseJson:responseJson
+                                                                                     response:task.response
+                                                                                      keyPair:keyPair
+                                                                                    enclaveId:enclaveId];
+
+                if (!attestation) {
+                    NSError *error = OWSErrorMakeUnableToProcessServerResponseError();
+                    failureHandler(error);
+                    return;
+                }
+
+                successHandler(attestation);
             });
         }
         failure:^(NSURLSessionDataTask *task, NSError *error) {
             NSHTTPURLResponse *response = (NSHTTPURLResponse *)task.response;
             DDLogVerbose(@"%@ remote attestation failure: %zd", self.logTag, response.statusCode);
+            failureHandler(error);
         }];
 }