Apollo graphql setting header to authmiddleware not working

问题

I am using react-native and apollo client and if I try to set header by jwt stored in AsyncStorage, it seems not working.
Other resolvers which doesn't need header works very well. My code is like below.

import { ApolloClient } from "apollo-client";
import { InMemoryCache } from "apollo-cache-inmemory";
import { ApolloLink } from "apollo-link";
import { createHttpLink } from "apollo-link-http";
import AsyncStorage from "@react-native-community/async-storage";

const cache = new InMemoryCache();

const getToken = async () => {
  const token = await AsyncStorage.getItem("jwt");

  if (token) {
    return token;
  } else {
    return null;
  }
};

const httpLink = new createHttpLink({
  uri: ""
});

const authLink = new ApolloLink((operation, forward) => {
  operation.setContext({
    headers: {
      "X-JWT": getToken()
      // this is where I set headers by getToken function
      // If I change function getToken to real token in string type, it works then
    }
  });

  return forward(operation);
});

const client = new ApolloClient({
  cache: cache,
  link: authLink.concat(httpLink)
});

export default client;

Like I commented in the code, calling getToken function is not working what I expected. I think I should have more knowledge of async and await, but I don't get it what is the real problem.

The error message I get from console is jwt malformed. Please let me know how to fix this problem

回答1:

Try to use setContext directly

import { ApolloClient } from "apollo-client";
import { createHttpLink } from "apollo-link-http";
import { setContext } from "apollo-link-context";
import { InMemoryCache } from "apollo-cache-inmemory";
import AsyncStorage from "@react-native-community/async-storage";

const httpLink = createHttpLink();

const authLink = setContext(async (_, { headers }) => {
  const token = await AsyncStorage.getItem("jwt");

  return {
    headers: {
      ...headers,
      "X-JWT": token || null
    }
  };
});

const client = new ApolloClient({
  link: authLink.concat(httpLink),
  cache: new InMemoryCache()
});

export default client;

回答2:

The problem is that you are not awaiting the promise. That means it should be await getToken(). In order to make this working the ApolloLink function should also be async.

This would decrease your performance a little because on every request it would read the token from your AsyncStore. I would do it like that:

import { ApolloClient } from "apollo-client";
import { InMemoryCache } from "apollo-cache-inmemory";
import { ApolloLink } from "apollo-link";
import { createHttpLink } from "apollo-link-http";
import AsyncStorage from "@react-native-community/async-storage";

const cache = new InMemoryCache();

let token
const getToken = async () => {
  if(token) return token;

  token = await AsyncStorage.getItem("jwt");

  return token || null;
};

const httpLink = new createHttpLink({
  uri: ""
});

const authLink = new ApolloLink(async (operation, forward) => {
  operation.setContext({
    headers: {
      "X-JWT": await getToken()
      // this is where I set headers by getToken function
      // If I change function getToken to real token in string type, it works then
    }
  });

  return forward(operation);
});

const client = new ApolloClient({
  cache: cache,
  link: authLink.concat(httpLink)
});

export default client;

来源：https://stackoverflow.com/questions/57747225/apollo-graphql-setting-header-to-authmiddleware-not-working

标签

react-native

async-await

apollo

apollo-client

asyncstorage