gql-session/app.js

"use strict";

require("dotenv").config();

const cors    = require("cors");
const express = require("express");
const helmet  = require("helmet");
const http    = require("http");

const { ApolloServer, gql }                 = require("apollo-server-express");
const { ApolloServerPluginDrainHttpServer } = require("apollo-server-core");

const corsOrigins = process.env.APP_CORS_ORIGINS.split(",");

const app = express();
app.enable("trust proxy");
app.use(cors({ origin: corsOrigins }));
if (app.get("env") === "production") {
  app.use(helmet());
  app.use(helmet.contentSecurityPolicy());
}

const httpServer = http.createServer(app);

const typeDefs = gql`
  type Hello {
    message: String
  }

  type Query {
    hello: Hello
  }
`;

const resolvers = {
  Query: {
    hello: _ => ({ message: "Hello World!" })
  }
};

const apollo = new ApolloServer({
  typeDefs,
  resolvers,
  plugin: [ApolloServerPluginDrainHttpServer({ httpServer })]
});
apollo.start().then(_ => {
  apollo.applyMiddleware({ app });

  app.all("*", (request, response) => response.send(""));

  httpServer.listen(process.env.APP_PORT);

  let apolloData = httpServer.address();
  console.log(`GraphQL service listening on ${apolloData.address}:${apolloData.port}${apollo.graphqlPath}`);
}).catch(error => console.log(error.message));