Stabilise token authenticated registration support (#2181)

* Stabilise token authenticated registration support

Token authenticated registration was added to the Matrix specification in v1.2:
https://spec.matrix.org/v1.2/client-server-api/#token-authenticated-registration

Signed-off-by: Callum Brown <[email protected]>

* Backwards compatibility with unstable auth type

Servers are not yet widely updated with support for the stable
version of the registration token UIA type.
Clients should check if the authentication type is either
`RegistrationToken` or `UnstableRegistrationToken`.

Signed-off-by: Callum Brown <[email protected]>

Author: govynnus

src/interactive-auth.ts

@@ -60,7 +60,11 @@ export enum AuthType {
     Sso = "m.login.sso",
     SsoUnstable = "org.matrix.login.sso",
     Dummy = "m.login.dummy",
-    RegistrationToken = "org.matrix.msc3231.login.registration_token",
+    RegistrationToken = "m.login.registration_token",
+    // For backwards compatability with servers that have not yet updated to
+    // use the stable "m.login.registration_token" type.
+    // The authentication flow is the same in both cases.
+    UnstableRegistrationToken = "org.matrix.msc3231.login.registration_token",
 }
 
 export interface IAuthDict {
@@ -79,7 +83,8 @@ export interface IAuthDict {
     // eslint-disable-next-line camelcase
     threepid_creds?: any;
     threepidCreds?: any;
-    registrationToken?: string;
+    // For m.login.registration_token type
+    token?: string;
 }
 
 class NoAuthFlowFoundError extends Error {