fetch token based on environment (#551)

Author: kanat

packages/stream_video_flutter/example/lib/core/token_service.dart

@@ -19,10 +19,11 @@ class TokenService {
 
   Future<TokenResponse> loadToken({
     required String userId,
+    required Environment environment,
     Duration? expiresIn,
   }) async {
     final queryParameters = <String, dynamic>{
-      'environment': 'demo',
+      'environment': environment.alias,
       'user_id': userId,
     };
     if (expiresIn != null) {
@@ -41,3 +42,12 @@ class TokenService {
     return TokenResponse.fromJson(body);
   }
 }
+
+enum Environment {
+  pronto('pronto'),
+  demo('demo');
+
+  const Environment(this.alias);
+
+  final String alias;
+}

packages/stream_video_flutter/example/lib/main.dart

@@ -23,7 +23,10 @@ Future<void> main() async {
 Future<Result<None>> _connectUser(UserInfo user) async {
   streamLog.i(_tag, () => '[connectUser] user: $user');
 
-  final tokenResponse = await const TokenService().loadToken(userId: user.id);
+  final tokenResponse = await const TokenService().loadToken(
+    environment: Environment.demo,
+    userId: user.id,
+  );
 
   final client = StreamVideo(
     tokenResponse.apiKey,