feat: enhance local storage and webview APIs with improved error handling and resource management

lib/services/metadata/apis/localstorage.dart

@@ -13,7 +13,7 @@ class PluginLocalStorageApi {
     required this.pluginName,
   }) {
     runtime.onMessage("LocalStorage.getItem", (args) {
-      final key = args[0];
+      final key = args[0]["key"];
       final value = getItem(key);
       runtime.evaluate(
         """

lib/services/metadata/apis/set_interval.dart

@@ -70,4 +70,11 @@ class PluginSetIntervalApi {
       }
     });
   }
+
+  void dispose() {
+    for (var timer in _timers.values) {
+      timer.cancel();
+    }
+    _timers.clear();
+  }
 }

lib/services/metadata/apis/totp.dart

@@ -32,7 +32,7 @@ class PluginTotpGenerator {
 
       runtime.evaluate(
         """
-        eventEmitter.emit('Totp.generate', '$otp');
+        eventEmitter.emit('TotpGenerator.generate', '$otp');
         """,
       );
     });

lib/services/metadata/apis/webview.dart

@@ -49,13 +49,17 @@ class PluginWebViewApi {
       }
       showWebView(
         url: args[0]["url"] as String,
-        initialSettings: WebviewInitialSettings.fromJson(
+        initialSettings: args[0]["initialSettings"] != null
-          args[0]["initialSettings"],
+            ? WebviewInitialSettings.fromJson(
-        ),
+                args[0]["initialSettings"],
+              )
+            : null,
       );
     });
   }
 
+  Webview? webviewWindow;
+
   Future showWebView({
     required String url,
     WebviewInitialSettings? initialSettings,
@@ -117,6 +121,8 @@ class PluginWebViewApi {
         ),
       );
 
+      webviewWindow = webview;
+
       runtime.onMessage("WebView.close", (args) {
         webview.close();
       });
@@ -134,7 +140,7 @@ class PluginWebViewApi {
                 "domain": e.domain,
                 "path": e.path,
               };
-            });
+            }).toList();
 
             runtime.evaluate(
               """
@@ -157,4 +163,9 @@ class PluginWebViewApi {
       }
     }
   }
+
+  void dispose() {
+    webviewWindow?.close();
+    webviewWindow = null;
+  }
 }

lib/services/metadata/metadata.dart

@@ -61,19 +61,6 @@ class MetadataApiSignature {
       },
     );
 
-    final res = runtime.evaluate(
-      """
-      ;$libraryCode;
-      const metadataApi = new MetadataApi();
-      """,
-    );
-
-    if (res.isError) {
-      AppLogger.reportError(
-        "Error evaluating code: $libraryCode\n${res.rawResult}",
-      );
-    }
-
     // Create all the PluginAPIs after library code is evaluated
     final localStorageApi = PluginLocalStorageApi(
       runtime: runtime,
@@ -93,12 +80,26 @@ class MetadataApiSignature {
       setIntervalApi,
     );
 
+    final res = runtime.evaluate(
+      """
+      ;$libraryCode;
+      const metadataApi = new MetadataApi();
+      """,
+    );
     metadataApi._signatureFlags = await metadataApi._getSignatureFlags();
 
+    if (res.isError) {
+      AppLogger.reportError(
+        "Error evaluating code: $libraryCode\n${res.rawResult}",
+      );
+    }
+
     return metadataApi;
   }
 
   void dispose() {
+    setIntervalApi.dispose();
+    webViewApi.dispose();
     runtime.dispose();
   }
 
@@ -119,7 +120,7 @@ class MetadataApiSignature {
       $method(...${args != null ? jsonEncode(args) : "[]"})
       .then((res) => {
         try {
-          sendMessage("$method", JSON.stringify(res));
+          sendMessage("$method", res ? JSON.stringify(res) : "[]");
         } catch (e) {
           console.error("Failed to send message in $method.then: ", `\${e.toString()}\n\${e.stack.toString()}`);
         }
@@ -497,6 +498,12 @@ class MetadataApiSignature {
   }
 
   // ----- User ------
+  Future<SpotubeUserObject> getMe() async {
+    final res = await invoke("metadataApi.getMe");
+
+    return SpotubeUserObject.fromJson(res);
+  }
+
   Future<void> followArtist(String userId, String artistId) async {
     await invoke("metadataApi.followArtist", [userId, artistId]);
   }