index.js

const jwt = require("jsonwebtoken");
const  mongoose = require("mongoose");
const { ApolloServer } = require("apollo-server-express");
const express = require("express");
const {graphqlUploadExpress} = require("graphql-upload");
const typeDefs = require("./gql/schema");
const resolvers = require("./gql/resolver");
require("dotenv").config({ path: ".env"});


mongoose.connect(process.env.BBDD,{
    useNewUrlParser: true,
    useUnifiedTopology: true
}, (err, _)=> {
    if(err){
        console.log("Error de conexion");
        console.log(err);
    }else{
       //console.log(process.env.BBDD);
       server();
    }
});

async function server() {


    
    const serverApollo = new ApolloServer({
        typeDefs,
        resolvers,
         context: ({req}) => {
             //console.log(req.headers.authorization);
              const token = req.headers.authorization;
              
               console.log("Header recibido es: " + token);
               if (token){
                   try {
                       const user = jwt.verify(
                           token.replace("Bearer ",""),
                           process.env.SECRET_KEY
                       );
                       return{
                           user,
                       }
                   } catch (error) {
                       console.log("### ERROR ###");
                       console.log(error);
                       throw new Error("Token Inválido");
                   }
               }
         }
    }); 


    await serverApollo.start();
    const app = express();
    app.use(graphqlUploadExpress());
    serverApollo.applyMiddleware({app});
    await new Promise((r) => app.listen({port: process.env.PORT || 4000},r));

    // serverApollo.listen().then(({url})=>{
         console.log("###################################");
         console.log(`Servidor listo en la url http://localhost:4000${serverApollo.graphqlPath}`);
         console.log("###################################");
    // });
}