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-rw-r--r--changelog.d/6079.feature1
-rw-r--r--docs/sample_config.yaml2
-rw-r--r--synapse/config/registration.py2
-rw-r--r--synapse/handlers/identity.py12
4 files changed, 16 insertions, 1 deletions
diff --git a/changelog.d/6079.feature b/changelog.d/6079.feature
new file mode 100644
index 0000000000..bcbb49ac58
--- /dev/null
+++ b/changelog.d/6079.feature
@@ -0,0 +1 @@
+Add `submit_url` response parameter to `*/msisdn/requestToken` endpoints.
diff --git a/docs/sample_config.yaml b/docs/sample_config.yaml
index bd208b17dd..46af6edf1f 100644
--- a/docs/sample_config.yaml
+++ b/docs/sample_config.yaml
@@ -940,6 +940,8 @@ uploads_path: "DATADIR/uploads"
 # by the Matrix Identity Service API specification:
 # https://matrix.org/docs/spec/identity_service/latest
 #
+# If a delegate is specified, the config option public_baseurl must also be filled out.
+#
 account_threepid_delegates:
     #email: https://example.com     # Delegate email sending to example.org
     #msisdn: http://localhost:8090  # Delegate SMS sending to this local process
diff --git a/synapse/config/registration.py b/synapse/config/registration.py
index d4654e99b3..bef89e2bf4 100644
--- a/synapse/config/registration.py
+++ b/synapse/config/registration.py
@@ -293,6 +293,8 @@ class RegistrationConfig(Config):
         # by the Matrix Identity Service API specification:
         # https://matrix.org/docs/spec/identity_service/latest
         #
+        # If a delegate is specified, the config option public_baseurl must also be filled out.
+        #
         account_threepid_delegates:
             #email: https://example.com     # Delegate email sending to example.org
             #msisdn: http://localhost:8090  # Delegate SMS sending to this local process
diff --git a/synapse/handlers/identity.py b/synapse/handlers/identity.py
index 264bdc2189..1f16afd14e 100644
--- a/synapse/handlers/identity.py
+++ b/synapse/handlers/identity.py
@@ -452,13 +452,23 @@ class IdentityHandler(BaseHandler):
                 id_server + "/_matrix/identity/api/v1/validate/msisdn/requestToken",
                 params,
             )
-            return data
         except HttpResponseException as e:
             logger.info("Proxied requestToken failed: %r", e)
             raise e.to_synapse_error()
         except TimeoutError:
             raise SynapseError(500, "Timed out contacting identity server")
 
+        assert self.hs.config.public_baseurl
+
+        # we need to tell the client to send the token back to us, since it doesn't
+        # otherwise know where to send it, so add submit_url response parameter
+        # (see also MSC2078)
+        data["submit_url"] = (
+            self.hs.config.public_baseurl
+            + "_matrix/client/unstable/add_threepid/msisdn/submit_token"
+        )
+        return data
+
     @defer.inlineCallbacks
     def validate_threepid_session(self, client_secret, sid):
         """Validates a threepid session with only the client secret and session ID