graphql_flutter_client.dart

import 'package:checksheett/config/AppConstants.dart';
import 'package:flutter/foundation.dart';
import 'package:graphql_flutter/graphql_flutter.dart';

class GraphQLClientConfig {
  // JWT Token based GraphQL client
  static Future<GraphQLClient> gqlClient(String token) async {
    final HttpLink httpLink = HttpLink(AppConstants.GQL_HTTPS_URL);
    final AuthLink authLink = AuthLink(
      getToken: () async => 'Bearer $token',
    );

    final Link link = authLink.concat(httpLink);
    GraphQLClient client = GraphQLClient(
      cache: GraphQLCache(),
      link: link,
      defaultPolicies: DefaultPolicies(
        query: Policies(
          fetch: FetchPolicy.networkOnly,
          error: ErrorPolicy.none,
        ),
      ),
    );
    return client;
  }

  // anonymous authorization GraphQL client
  static Future<GraphQLClient> gqlClientAnonymous() async {
    final HttpLink httpLink = HttpLink(
      AppConstants.GQL_HTTPS_URL,
      defaultHeaders: {'HASURA_GRAPHQL_UNAUTHORIZED_ROLE': 'anonymous'},
    );
    // httpLink.defaultHeaders['HASURA_GRAPHQL_UNAUTHORIZED_ROLE'] = 'anonymous';
    final Link link = httpLink;
    GraphQLClient client = GraphQLClient(
      cache: GraphQLCache(),
      link: link,
      defaultPolicies: DefaultPolicies(
        query: Policies(
          fetch: FetchPolicy.networkOnly,
          error: ErrorPolicy.none,
        ),
      ),
    );
    return client;
  }

  // JWT Token based GraphQL client WebSocket based connection
  static ValueNotifier<GraphQLClient> gqlClientWS(String token) {
    // print("Subscription Client Initializing");
    WebSocketLink webSocketLink = WebSocketLink(
      AppConstants.GQL_WS_URL,
      config: SocketClientConfig(
        autoReconnect: true,
        inactivityTimeout: const Duration(seconds: 30),
        delayBetweenReconnectionAttempts: const Duration(seconds: 2),
        initialPayload: () async {
          return {
            'headers': {'Authorization': 'Bearer $token'}
            // 'headers': {'HASURA_GRAPHQL_UNAUTHORIZED_ROLE': 'anonymous'}
            // 'headers': {'HASURA_GRAPHQL_ADMIN_SECRET': 'w94Fi7hPvbw5X*p'}
          };
        },
      ),
    );

    ValueNotifier<GraphQLClient> client = ValueNotifier(
      GraphQLClient(
        cache: GraphQLCache(),
        link: webSocketLink,
        defaultPolicies: DefaultPolicies(
          query: Policies(
            fetch: FetchPolicy.networkOnly,
            error: ErrorPolicy.none,
          ),
        ),
      ),
    );
    return client;
  }
}