Remove unstable MSC2858 API, including experimental.msc2858_enabled config option (#10693)

Signed-off-by: Sean Quah <seanq@element.io>

changelog.d/10693.removal

@@ -0,0 +1 @@
+Remove [unstable MSC2858 API](https://github.com/matrix-org/matrix-doc/blob/master/proposals/2858-Multiple-SSO-Identity-Providers.md#unstable-prefix), including the undocumented `experimental.msc2858_enabled` config option. The unstable API has been deprecated since Synapse 1.35. Client authors should update their clients to use the stable API introduced in Synapse 1.30 if they have not already done so.

synapse/config/experimental.py

@@ -24,9 +24,6 @@ class ExperimentalConfig(Config):
     def read_config(self, config: JsonDict, **kwargs):
         experimental = config.get("experimental_features") or {}
 
-        # MSC2858 (multiple SSO identity providers)
-        self.msc2858_enabled: bool = experimental.get("msc2858_enabled", False)
-
         # MSC3026 (busy presence state)
         self.msc3026_enabled: bool = experimental.get("msc3026_enabled", False)
 

synapse/config/oidc.py

@@ -277,12 +277,6 @@ OIDC_PROVIDER_CONFIG_SCHEMA = {
             "maxLength": 255,
             "pattern": "^[a-z][a-z0-9_.-]*$",
         },
-        "idp_unstable_brand": {
-            "type": "string",
-            "minLength": 1,
-            "maxLength": 255,
-            "pattern": "^[a-z][a-z0-9_.-]*$",
-        },
         "discover": {"type": "boolean"},
         "issuer": {"type": "string"},
         "client_id": {"type": "string"},
@@ -483,7 +477,6 @@ def _parse_oidc_config_dict(
         idp_name=oidc_config.get("idp_name", "OIDC"),
         idp_icon=idp_icon,
         idp_brand=oidc_config.get("idp_brand"),
-        unstable_idp_brand=oidc_config.get("unstable_idp_brand"),
         discover=oidc_config.get("discover", True),
         issuer=oidc_config["issuer"],
         client_id=oidc_config["client_id"],
@@ -531,9 +524,6 @@ class OidcProviderConfig:
     # Optional brand identifier for this IdP.
     idp_brand = attr.ib(type=Optional[str])
 
-    # Optional brand identifier for the unstable API (see MSC2858).
-    unstable_idp_brand = attr.ib(type=Optional[str])
-
     # whether the OIDC discovery mechanism is used to discover endpoints
     discover = attr.ib(type=bool)
 

synapse/handlers/cas.py

@@ -82,7 +82,6 @@ class CasHandler:
         # the SsoIdentityProvider protocol type.
         self.idp_icon = None
         self.idp_brand = None
-        self.unstable_idp_brand = None
 
         self._sso_handler = hs.get_sso_handler()
 

synapse/handlers/oidc.py

@@ -338,9 +338,6 @@ class OidcProvider:
         # optional brand identifier for this auth provider
         self.idp_brand = provider.idp_brand
 
-        # Optional brand identifier for the unstable API (see MSC2858).
-        self.unstable_idp_brand = provider.unstable_idp_brand
-
         self._sso_handler = hs.get_sso_handler()
 
         self._sso_handler.register_identity_provider(self)

synapse/handlers/saml.py

@@ -80,7 +80,6 @@ class SamlHandler(BaseHandler):
         # the SsoIdentityProvider protocol type.
         self.idp_icon = None
         self.idp_brand = None
-        self.unstable_idp_brand = None
 
         # a map from saml session id to Saml2SessionData object
         self._outstanding_requests_dict: Dict[str, Saml2SessionData] = {}

synapse/handlers/sso.py

@@ -104,11 +104,6 @@ class SsoIdentityProvider(Protocol):
         """Optional branding identifier"""
         return None
 
-    @property
-    def unstable_idp_brand(self) -> Optional[str]:
-        """Optional brand identifier for the unstable API (see MSC2858)."""
-        return None
-
     @abc.abstractmethod
     async def handle_redirect_request(
         self,

synapse/rest/client/login.py

@@ -79,7 +79,6 @@ class LoginRestServlet(RestServlet):
         self.saml2_enabled = hs.config.saml2_enabled
         self.cas_enabled = hs.config.cas_enabled
         self.oidc_enabled = hs.config.oidc_enabled
-        self._msc2858_enabled = hs.config.experimental.msc2858_enabled
         self._msc2918_enabled = hs.config.access_token_lifetime is not None
 
         self.auth = hs.get_auth()
@@ -111,7 +110,7 @@ class LoginRestServlet(RestServlet):
         _load_sso_handlers(hs)
 
     def on_GET(self, request: SynapseRequest) -> Tuple[int, JsonDict]:
-        flows = []
+        flows: List[JsonDict] = []
         if self.jwt_enabled:
             flows.append({"type": LoginRestServlet.JWT_TYPE})
             flows.append({"type": LoginRestServlet.JWT_TYPE_DEPRECATED})
@@ -122,25 +121,15 @@ class LoginRestServlet(RestServlet):
             flows.append({"type": LoginRestServlet.CAS_TYPE})
 
         if self.cas_enabled or self.saml2_enabled or self.oidc_enabled:
-            sso_flow: JsonDict = {
-                "type": LoginRestServlet.SSO_TYPE,
-                "identity_providers": [
-                    _get_auth_flow_dict_for_idp(
-                        idp,
-                    )
-                    for idp in self._sso_handler.get_identity_providers().values()
-                ],
-            }
-
-            if self._msc2858_enabled:
-                # backwards-compatibility support for clients which don't
-                # support the stable API yet
-                sso_flow["org.matrix.msc2858.identity_providers"] = [
-                    _get_auth_flow_dict_for_idp(idp, use_unstable_brands=True)
-                    for idp in self._sso_handler.get_identity_providers().values()
-                ]
-
-            flows.append(sso_flow)
+            flows.append(
+                {
+                    "type": LoginRestServlet.SSO_TYPE,
+                    "identity_providers": [
+                        _get_auth_flow_dict_for_idp(idp)
+                        for idp in self._sso_handler.get_identity_providers().values()
+                    ],
+                }
+            )
 
             # While it's valid for us to advertise this login type generally,
             # synapse currently only gives out these tokens as part of the
@@ -433,9 +422,7 @@ class LoginRestServlet(RestServlet):
         return result
 
 
-def _get_auth_flow_dict_for_idp(
-    idp: SsoIdentityProvider, use_unstable_brands: bool = False
-) -> JsonDict:
+def _get_auth_flow_dict_for_idp(idp: SsoIdentityProvider) -> JsonDict:
     """Return an entry for the login flow dict
 
     Returns an entry suitable for inclusion in "identity_providers" in the
@@ -443,17 +430,12 @@ def _get_auth_flow_dict_for_idp(
 
     Args:
         idp: the identity provider to describe
-        use_unstable_brands: whether we should use brand identifiers suitable
-           for the unstable API
     """
     e: JsonDict = {"id": idp.idp_id, "name": idp.idp_name}
     if idp.idp_icon:
         e["icon"] = idp.idp_icon
     if idp.idp_brand:
         e["brand"] = idp.idp_brand
-    # use the stable brand identifier if the unstable identifier isn't defined.
-    if use_unstable_brands and idp.unstable_idp_brand:
-        e["brand"] = idp.unstable_idp_brand
     return e
 
 
@@ -504,25 +486,8 @@ class SsoRedirectServlet(RestServlet):
         # register themselves with the main SSOHandler.
         _load_sso_handlers(hs)
         self._sso_handler = hs.get_sso_handler()
-        self._msc2858_enabled = hs.config.experimental.msc2858_enabled
         self._public_baseurl = hs.config.public_baseurl
 
-    def register(self, http_server: HttpServer) -> None:
-        super().register(http_server)
-        if self._msc2858_enabled:
-            # expose additional endpoint for MSC2858 support: backwards-compat support
-            # for clients which don't yet support the stable endpoints.
-            http_server.register_paths(
-                "GET",
-                client_patterns(
-                    "/org.matrix.msc2858/login/sso/redirect/(?P<idp_id>[A-Za-z0-9_.~-]+)$",
-                    releases=(),
-                    unstable=True,
-                ),
-                self.on_GET,
-                self.__class__.__name__,
-            )
-
     async def on_GET(
         self, request: SynapseRequest, idp_id: Optional[str] = None
     ) -> None:

tests/rest/client/test_login.py

@@ -445,26 +445,9 @@ class MultiSSOTestCase(unittest.HomeserverTestCase):
             [f["type"] for f in channel.json_body["flows"]], expected_flow_types
         )
 
-    @override_config({"experimental_features": {"msc2858_enabled": True}})
-    def test_get_msc2858_login_flows(self):
-        """The SSO flow should include IdP info if MSC2858 is enabled"""
-        channel = self.make_request("GET", "/_matrix/client/r0/login")
-        self.assertEqual(channel.code, 200, channel.result)
-
-        # stick the flows results in a dict by type
-        flow_results: Dict[str, Any] = {}
-        for f in channel.json_body["flows"]:
-            flow_type = f["type"]
-            self.assertNotIn(
-                flow_type, flow_results, "duplicate flow type %s" % (flow_type,)
-            )
-            flow_results[flow_type] = f
-
-        self.assertIn("m.login.sso", flow_results, "m.login.sso was not returned")
-        sso_flow = flow_results.pop("m.login.sso")
-        # we should have a set of IdPs
+        flows = {flow["type"]: flow for flow in channel.json_body["flows"]}
         self.assertCountEqual(
-            sso_flow["org.matrix.msc2858.identity_providers"],
+            flows["m.login.sso"]["identity_providers"],
             [
                 {"id": "cas", "name": "CAS"},
                 {"id": "saml", "name": "SAML"},
@@ -473,19 +456,10 @@ class MultiSSOTestCase(unittest.HomeserverTestCase):
             ],
         )
 
-        # the rest of the flows are simple
-        expected_flows = [
-            {"type": "m.login.cas"},
-            {"type": "m.login.token"},
-            {"type": "m.login.password"},
-        ] + ADDITIONAL_LOGIN_FLOWS
-
-        self.assertCountEqual(flow_results.values(), expected_flows)
-
     def test_multi_sso_redirect(self):
         """/login/sso/redirect should redirect to an identity picker"""
         # first hit the redirect url, which should redirect to our idp picker
-        channel = self._make_sso_redirect_request(False, None)
+        channel = self._make_sso_redirect_request(None)
         self.assertEqual(channel.code, 302, channel.result)
         uri = channel.headers.getRawHeaders("Location")[0]
 
@@ -637,13 +611,13 @@ class MultiSSOTestCase(unittest.HomeserverTestCase):
 
     def test_client_idp_redirect_to_unknown(self):
         """If the client tries to pick an unknown IdP, return a 404"""
-        channel = self._make_sso_redirect_request(False, "xxx")
+        channel = self._make_sso_redirect_request("xxx")
         self.assertEqual(channel.code, 404, channel.result)
         self.assertEqual(channel.json_body["errcode"], "M_NOT_FOUND")
 
     def test_client_idp_redirect_to_oidc(self):
         """If the client pick a known IdP, redirect to it"""
-        channel = self._make_sso_redirect_request(False, "oidc")
+        channel = self._make_sso_redirect_request("oidc")
         self.assertEqual(channel.code, 302, channel.result)
         oidc_uri = channel.headers.getRawHeaders("Location")[0]
         oidc_uri_path, oidc_uri_query = oidc_uri.split("?", 1)
@@ -651,37 +625,12 @@ class MultiSSOTestCase(unittest.HomeserverTestCase):
         # it should redirect us to the auth page of the OIDC server
         self.assertEqual(oidc_uri_path, TEST_OIDC_AUTH_ENDPOINT)
 
-    @override_config({"experimental_features": {"msc2858_enabled": True}})
-    def test_client_msc2858_redirect_to_oidc(self):
-        """Test the unstable API"""
-        channel = self._make_sso_redirect_request(True, "oidc")
-        self.assertEqual(channel.code, 302, channel.result)
-        oidc_uri = channel.headers.getRawHeaders("Location")[0]
-        oidc_uri_path, oidc_uri_query = oidc_uri.split("?", 1)
-
-        # it should redirect us to the auth page of the OIDC server
-        self.assertEqual(oidc_uri_path, TEST_OIDC_AUTH_ENDPOINT)
-
-    def test_client_idp_redirect_msc2858_disabled(self):
-        """If the client tries to use the MSC2858 endpoint but MSC2858 is disabled, return a 400"""
-        channel = self._make_sso_redirect_request(True, "oidc")
-        self.assertEqual(channel.code, 400, channel.result)
-        self.assertEqual(channel.json_body["errcode"], "M_UNRECOGNIZED")
-
-    def _make_sso_redirect_request(
-        self, unstable_endpoint: bool = False, idp_prov: Optional[str] = None
-    ):
+    def _make_sso_redirect_request(self, idp_prov: Optional[str] = None):
         """Send a request to /_matrix/client/r0/login/sso/redirect
 
-        ... or the unstable equivalent
-
         ... possibly specifying an IDP provider
         """
-        endpoint = (
-            "/_matrix/client/unstable/org.matrix.msc2858/login/sso/redirect"
-            if unstable_endpoint
-            else "/_matrix/client/r0/login/sso/redirect"
-        )
+        endpoint = "/_matrix/client/r0/login/sso/redirect"
         if idp_prov is not None:
             endpoint += "/" + idp_prov
         endpoint += "?redirectUrl=" + urllib.parse.quote_plus(TEST_CLIENT_REDIRECT_URL)