First commit

lib/services/grpc_service.dart

@@ -0,0 +1,31 @@
+import 'package:grpc/grpc.dart';
+import 'package:sampleapp/services/auth/auth.dart';
+
+class AuthInterceptor extends ClientInterceptor {
+  final AuthService authService;
+
+  AuthInterceptor(this.authService);
+
+  @override
+  ResponseFuture<R> interceptUnary<Q, R>(
+      ClientMethod<Q, R> method, Q request, CallOptions options, invoker) {
+    final metadata = <String, String>{};
+    metadata['authorization'] = 'Bearer ${authService.accessToken}';
+    options = options.mergedWith(CallOptions(metadata: metadata));
+    return invoker(method, request, options);
+  }
+}
+
+class GrpcClient {
+  static Client initializeClient(AuthService authService, String host, int port, Client Function(ClientChannel, List<ClientInterceptor>) clientFactory) {
+    final interceptor = AuthInterceptor(authService);
+    final channel = ClientChannel(
+      host,
+      port: port,
+      options: const ChannelOptions(
+        credentials: ChannelCredentials.secure(),
+      ),
+    );
+    return clientFactory(channel, [interceptor]);
+  }
+}