Privacy: Sending Third-Party Request Tokens via the Homeserver ([MSC2…

…078](matrix-org/matrix-spec-proposals#2078)). element-hq/element-ios#2731
matrix-org · Oct 8, 2019 · 5bf9bbb · 5bf9bbb
1 parent e7ff61d
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Showing 5 changed files with 74 additions and 7 deletions.
diff --git a/CHANGES.rst b/CHANGES.rst
@@ -19,9 +19,11 @@ Improvements:
  * Privacy: Store Identity Server in Account Data ([MSC2230](https://github.com/matrix-org/matrix-doc/pull/2230))(vector-im/riot-ios#2665).
  * Privacy: Lowercase emails during IS lookup calls (vector-im/riot-ios#2696).
  * Privacy: MXRestClient: Use `id_access_token` in CS API when required (vector-im/riot-ios#2704).
+ * Privacy: Sending Third-Party Request Tokens via the Homeserver ([MSC2078](https://github.com/matrix-org/matrix-doc/pull/2078)).
 
 API break:
  * MXRestClient: Remove identity server requests. Now MXIdentityService is used to perform identity server requests.
+ * MXRestClient: requestTokenForPhoneNumber returns an additional optional parameter (`submitUrl`).
 
 Bug Fix:
  * Send kMXSessionCryptoDidCorruptDataNotification from the main thread.

diff --git a/MatrixSDK/MXRestClient.h b/MatrixSDK/MXRestClient.h
@@ -599,7 +599,7 @@ typedef MXHTTPOperation* (^MXRestClientIdentityServerAccessTokenHandler)(void (^
                                   clientSecret:(NSString*)clientSecret
                                    sendAttempt:(NSUInteger)sendAttempt
                                       nextLink:(NSString *)nextLink
-                                       success:(void (^)(NSString *sid, NSString *msisdn))success
+                                       success:(void (^)(NSString *sid, NSString *msisdn, NSString *submitUrl))success
                                        failure:(void (^)(NSError *error))failure;
 
 #pragma mark - Push Notifications

diff --git a/MatrixSDK/MXRestClient.m b/MatrixSDK/MXRestClient.m
@@ -943,7 +943,7 @@ - (MXHTTPOperation*)requestTokenForPhoneNumber:(NSString*)phoneNumber
                                   clientSecret:(NSString*)clientSecret
                                    sendAttempt:(NSUInteger)sendAttempt
                                       nextLink:(NSString *)nextLink
-                                       success:(void (^)(NSString *sid, NSString *msisdn))success
+                                       success:(void (^)(NSString *sid, NSString *msisdn, NSString *submitUrl))success
                                        failure:(void (^)(NSError *error))failure
 {
     NSMutableDictionary *parameters = [NSMutableDictionary dictionaryWithDictionary:@{
@@ -973,12 +973,13 @@ - (MXHTTPOperation*)requestTokenForPhoneNumber:(NSString*)phoneNumber
 
         if (success)
         {
-            __block NSString *sid, *msisdn;
+            __block NSString *sid, *msisdn, *submitUrl;
             [self dispatchProcessing:^{
                 MXJSONModelSetString(sid, JSONResponse[@"sid"]);
                 MXJSONModelSetString(msisdn, JSONResponse[@"msisdn"]);
+                MXJSONModelSetString(submitUrl, JSONResponse[@"submit_url"]);
             } andCompletion:^{
-                success(sid, msisdn);
+                success(sid, msisdn, submitUrl);
             }];
         }
     } failure:failure];

diff --git a/MatrixSDK/ThreePidAdd/MX3PidAddManager.m b/MatrixSDK/ThreePidAdd/MX3PidAddManager.m
@@ -155,13 +155,14 @@ - (MX3PidAddSession*)startAddPhoneNumberSessionWithPhoneNumber:(NSString*)phoneN
 
     threePidAddSession.httpOperation = [self checkIdentityServerRequirementForAdding3PidWithSuccess:^{
 
-        MXHTTPOperation *operation = [self->mxSession.matrixRestClient requestTokenForPhoneNumber:phoneNumber isDuringRegistration:NO countryCode:countryCode clientSecret:threePidAddSession.clientSecret sendAttempt:threePidAddSession.sendAttempt++ nextLink:nil success:^(NSString *sid, NSString *msisdn) {
+        MXHTTPOperation *operation = [self->mxSession.matrixRestClient requestTokenForPhoneNumber:phoneNumber isDuringRegistration:NO countryCode:countryCode clientSecret:threePidAddSession.clientSecret sendAttempt:threePidAddSession.sendAttempt++ nextLink:nil success:^(NSString *sid, NSString *msisdn, NSString *submitUrl) {
 
             NSLog(@"[MX3PidAddManager] startAddPhoneNumberSessionWithPhoneNumber: DONE: threePid: %@", threePidAddSession);
 
             threePidAddSession.httpOperation = nil;
 
             threePidAddSession.sid = sid;
+            threePidAddSession.submitUrl = submitUrl;
             success();
 
         } failure:^(NSError *error) {
@@ -402,8 +403,21 @@ - (nullable MXHTTPOperation *)submitValidationToken:(NSString *)token
                                             success:(void (^)(void))success
                                             failure:(void (^)(NSError * _Nonnull))failure
 {
+    NSLog(@"[MX3PidAddManager] submitValidationToken: for3PidAddSession: %@", threePidAddSession);
+
     MXHTTPOperation *operation;
-    if (mxSession.identityService)
+    if ([threePidAddSession.medium isEqualToString:kMX3PIDMediumMSISDN]
+        && threePidAddSession.submitUrl)
+    {
+        operation = [self submitMsisdnTokenOtherUrl:threePidAddSession.submitUrl
+                                              token:token
+                                             medium:threePidAddSession.medium
+                                       clientSecret:threePidAddSession.clientSecret
+                                                sid:threePidAddSession.sid
+                                            success:success
+                                            failure:failure];
+    }
+    else if (mxSession.identityService)
     {
         operation = [mxSession.identityService submit3PIDValidationToken:token
                                                                   medium:threePidAddSession.medium
@@ -425,6 +439,50 @@ - (nullable MXHTTPOperation *)submitValidationToken:(NSString *)token
     return operation;
 }
 
+/**
+ Submits a MSISDN token to an arbitrary URL.
+
+ This is used when submitting the code sent by SMS to a phone number in the
+ newer 3PID flow where the homeserver validates 3PID ownership (as part of
+ `[MXRestClient requestTokenForPhoneNumber:]`). The homeserver response may
+ include a `submit_url` to specify where the token should be sent, and this
+ helper can be used to pass the token to this URL.
+
+ @param url the URL to post data to.
+ @param token the validation token.
+ @param medium the type of the third-party id (see kMX3PIDMediumEmail, kMX3PIDMediumMSISDN).
+ @param clientSecret the clientSecret used during the validation request.
+ @param sid the validation session id returned by the server.
+
+ @param success A block object called when the operation succeeds.
+ @param failure A block object called when the operation fails.
+ */
+- (MXHTTPOperation *)submitMsisdnTokenOtherUrl:(NSString *)url
+                                         token:(NSString*)token
+                                        medium:(NSString *)medium
+                                  clientSecret:(NSString *)clientSecret
+                                           sid:(NSString *)sid
+                                       success:(void (^)(void))success
+                                       failure:(void (^)(NSError *))failure
+{
+    NSLog(@"[MX3PidAddManager] submitMsisdnTokenOtherUrl: %@", url);
+
+    NSDictionary *parameters = @{
+                                 @"sid": sid,
+                                 @"client_secret": clientSecret,
+                                 @"token": token
+                                 };
+
+   MXHTTPClient *httpClient = [[MXHTTPClient alloc] initWithBaseURL:nil andOnUnrecognizedCertificateBlock:nil];
+   return [httpClient requestWithMethod:@"POST"
+                                    path:url
+                              parameters:parameters
+                                 success:^(NSDictionary *JSONResponse) {
+                                     success();
+                                 }
+                                 failure:failure];
+}
+
 
 #pragma mark - Bind to Identity Server -
 
@@ -633,7 +691,7 @@ - (MXHTTPOperation *)startBind3PidSessionWithOldHomeserver:(MX3PidAddSession*)th
         }
         else
         {
-            operation2 = [self->mxSession.matrixRestClient requestTokenForPhoneNumber:threePidAddSession.address isDuringRegistration:NO countryCode:threePidAddSession.countryCode clientSecret:threePidAddSession.clientSecret sendAttempt:threePidAddSession.sendAttempt++ nextLink:nil success:^(NSString *sid, NSString *msisdn) {
+            operation2 = [self->mxSession.matrixRestClient requestTokenForPhoneNumber:threePidAddSession.address isDuringRegistration:NO countryCode:threePidAddSession.countryCode clientSecret:threePidAddSession.clientSecret sendAttempt:threePidAddSession.sendAttempt++ nextLink:nil success:^(NSString *sid, NSString *msisdn, NSString *submitUrl) {
 
                 NSLog(@"[MX3PidAddManager] startBind3PidSessionWithOldHomeserver: DONE: threePid: %@", threePidAddSession);
 

diff --git a/MatrixSDK/ThreePidAdd/MX3PidAddSession.h b/MatrixSDK/ThreePidAdd/MX3PidAddSession.h
@@ -71,6 +71,12 @@ NS_ASSUME_NONNULL_BEGIN
  */
 @property (nonatomic) BOOL bind;
 
+/**
+ The url where the validation token should be sent.
+ @see [self submitMsisdnTokenOtherUrl:] for more details.
+ */
+@property (nonatomic, nullable) NSString *submitUrl;
+
 @end
 
 NS_ASSUME_NONNULL_END