feat: Implement oauth auth code and refresh token flows

src/api/client/oauth/mod.rs

@@ -1,17 +1,31 @@
 mod register_client;
 mod server_metadata;
+mod token;
 
 use axum::{
 	Json, Router,
+	extract::State,
 	routing::method_routing::{get, post},
 };
 use serde_json::json;
 pub(crate) use server_metadata::*;
 
-pub(crate) const BASE_PATH: &str = "/_continuwuity/oauth2/";
+const BASE_PATH: &str = "/_continuwuity/oauth2/";
 
 pub(crate) fn router() -> Router<crate::State> {
+	Router::new().nest(BASE_PATH, oauth_router())
+	// TODO(unspecced): used by old versions of the matrix-js-sdk
+	// .route("/.well-known/openid-configuration", get(
+	// 	async |State(services): State<crate::State>| {
+	// 		Json(authorization_server_metadata(&services).await)
+	// 	}
+	// ))
+}
+
+fn oauth_router() -> Router<crate::State> {
 	Router::new()
 		.route("/client/register", post(register_client::register_client_route))
+		// TODO(unspecced): used by old versions of the matrix-js-sdk
 		.route("/client/keys.json", get(async || Json(json!({"keys": []}))))
+		.route("/grant/token", post(token::token_route))
 }