chore(ffi): Expose support for registration through OIDC in the login details.

Author: pixlwave

bindings/matrix-sdk-ffi/src/authentication.rs

@@ -26,6 +26,7 @@ pub struct HomeserverLoginDetails {
     pub(crate) url: String,
     pub(crate) sliding_sync_version: SlidingSyncVersion,
     pub(crate) supports_oidc_login: bool,
+    pub(crate) supports_oidc_registration: bool,
     pub(crate) supports_password_login: bool,
 }
 
@@ -46,6 +47,11 @@ impl HomeserverLoginDetails {
         self.supports_oidc_login
     }
 
+    /// Whether the current homeserver supports registration using OIDC.
+    pub fn supports_oidc_registration(&self) -> bool {
+        self.supports_oidc_registration
+    }
+
     /// Whether the current homeserver supports the password login flow.
     pub fn supports_password_login(&self) -> bool {
         self.supports_password_login

bindings/matrix-sdk-ffi/src/client.rs

@@ -266,14 +266,29 @@ impl Client {
 impl Client {
     /// Information about login options for the client's homeserver.
     pub async fn homeserver_login_details(&self) -> Arc<HomeserverLoginDetails> {
-        let supports_oidc_login = self.inner.oidc().fetch_authentication_issuer().await.is_ok();
+        let oidc = self.inner.oidc();
+        let (supports_oidc_login, supports_oidc_registration) =
+            if let Ok(issuer) = oidc.fetch_authentication_issuer().await {
+                if let Ok(metadata) = &oidc.given_provider_metadata(&issuer).await {
+                    metadata
+                        .prompt_values_supported
+                        .as_ref()
+                        .map(|prompts| (true, prompts.contains(&SdkOidcPrompt::Create)))
+                        .unwrap_or((true, false))
+                } else {
+                    (true, false)
+                }
+            } else {
+                (false, false)
+            };
         let supports_password_login = self.supports_password_login().await.ok().unwrap_or(false);
         let sliding_sync_version = self.sliding_sync_version();
 
         Arc::new(HomeserverLoginDetails {
             url: self.homeserver(),
             sliding_sync_version,
             supports_oidc_login,
+            supports_oidc_registration,
             supports_password_login,
         })
     }