authorization: implement /access/info endpoint

Signed-off-by: Luca Schöneberg <luca-schoeneberg@outlook.com>

docs/web_api.md

@@ -2125,6 +2125,25 @@ to any API endpoint.  The query string should be added in the form of:
 ?token={base32_random_token}
 ```
 
+#### Retrieve information about authorization endpoints
+HTTP Request:
+```http
+GET /access/info
+```
+JSON-RPC request: Not Available
+
+Returns: An object containing information about authorization endpoints, such as
+default_source and available_sources.
+```json
+{
+    "default_source": "moonraker",
+    "available_sources": [
+        "moonraker",
+        "ldap"
+    ]
+}
+```
+
 #### Get the Current API Key
 HTTP request:
 ```http

moonraker/components/authorization.py

@@ -220,6 +220,7 @@ class Authorization:
         self.permitted_paths.add("/server/redirect")
         self.permitted_paths.add("/access/login")
         self.permitted_paths.add("/access/refresh_jwt")
+        self.permitted_paths.add("/access/info")
         self.server.register_endpoint(
             "/access/login", ['POST'], self._handle_login,
             transports=['http'])
@@ -244,6 +245,9 @@ class Authorization:
         self.server.register_endpoint(
             "/access/oneshot_token", ['GET'],
             self._handle_oneshot_request, transports=['http'])
+        self.server.register_endpoint(
+            "/access/info", ['GET'],
+            self._handle_default_source_request, transports=['http'])
         self.server.register_notification("authorization:user_created")
         self.server.register_notification("authorization:user_deleted")
 
@@ -287,6 +291,17 @@ class Authorization:
             "action": "user_logged_out"
         }
 
+    async def _handle_default_source_request(self,
+                                             web_request: WebRequest
+                                             ) -> Dict[str, str | List[str]]:
+        sources = ["moonraker"]
+        if self.ldap is not None:
+            sources.append("ldap")
+        return {
+            "default_source": self.default_source,
+            "available_sources": sources
+        }
+
     async def _handle_refresh_jwt(self,
                                   web_request: WebRequest
                                   ) -> Dict[str, str]: