1 files changed, 62 insertions, 0 deletions
diff --git a/frontend/lib/initApollo.js b/frontend/lib/initApollo.js
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+++ b/frontend/lib/initApollo.js
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+import { ApolloClient } from 'apollo-client';
+import { ApolloLink, concat } from 'apollo-link';
+import { HttpLink } from 'apollo-link-http';
+import { InMemoryCache } from 'apollo-cache-inmemory';
+import fetch from 'isomorphic-fetch';
+import { endpoint } from '../config';
+
+let apolloClient = null;
+
+// Polyfill fetch() on the server (used by apollo-client)
+if (!process.browser) {
+  global.fetch = fetch;
+}
+
+function create(initialState) {
+  // First we create three peices of middleware
+
+  // 1. Create a link for local state to be managed in Apollo
+
+
+  // 1. connect to our GraphQL API
+  const httpLink = new HttpLink({
+    uri: endpoint, // Server URL (must be absolute)
+    opts: {
+      credentials: 'same-origin',
+    },
+  });
+
+  // 2. One to tack on our auth token on each request
+  const authMiddleware = new ApolloLink((operation, forward) => {
+    const headers = {};
+
+    if (typeof localStorage !== 'undefined' && localStorage.getItem('auth0IdToken')) {
+      headers.authorization = `Bearer ${localStorage.getItem('auth0IdToken')}`;
+    }
+
+    operation.setContext({ headers });
+    return forward(operation);
+  });
+
+  return new ApolloClient({
+    connectToDevTools: process.browser,
+    ssrMode: !process.browser, // Disables forceFetch on the server (so queries are only run once)
+    link: concat(authMiddleware, httpLink),
+    cache: new InMemoryCache().restore(initialState || {}),
+  });
+}
+
+export default function initApollo(initialState) {
+  // Make sure to create a new client for every server-side request so that data
+  // isn't shared between connections (which would be bad)
+  if (!process.browser) {
+    return create(initialState);
+  }
+
+  // Reuse client on the client-side
+  if (!apolloClient) {
+    apolloClient = create(initialState);
+  }
+
+  return apolloClient;
+}