Episode 4: Next.js and GraphQL Auth

.graphqlrc.yml

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+schema: 'http://localhost:4001/graphql'
+extensions:
+  endpoints:
+    default:
+      url: 'http://localhost:4001/graphql'

next-app/.gitignore

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+# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
+
+# dependencies
+/node_modules
+/.pnp
+.pnp.js
+
+# testing
+/coverage
+
+# next.js
+/.next/
+/out/
+
+# production
+/build
+
+# misc
+.DS_Store
+*.pem
+
+# debug
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# local env files
+.env.local
+.env.development.local
+.env.test.local
+.env.production.local
+
+# vercel
+.vercel

next-app/README.md

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+This is a [Next.js](https://nextjs.org/) project bootstrapped with [`create-next-app`](https://github.com/vercel/next.js/tree/canary/packages/create-next-app).
+
+## Getting Started
+
+First, run the development server:
+
+```bash
+npm run dev
+# or
+yarn dev
+```
+
+Open [http://localhost:3000](http://localhost:3000) with your browser to see the result.
+
+You can start editing the page by modifying `pages/index.js`. The page auto-updates as you edit the file.
+
+## Learn More
+
+To learn more about Next.js, take a look at the following resources:
+
+- [Next.js Documentation](https://nextjs.org/docs) - learn about Next.js features and API.
+- [Learn Next.js](https://nextjs.org/learn) - an interactive Next.js tutorial.
+
+You can check out [the Next.js GitHub repository](https://github.com/vercel/next.js/) - your feedback and contributions are welcome!
+
+## Deploy on Vercel
+
+The easiest way to deploy your Next.js app is to use the [Vercel Platform](https://vercel.com/import?utm_medium=default-template&filter=next.js&utm_source=create-next-app&utm_campaign=create-next-app-readme) from the creators of Next.js.
+
+Check out our [Next.js deployment documentation](https://nextjs.org/docs/deployment) for more details.

next-app/lib/auth.js

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+import React, { useState, useContext, createContext } from 'react'
+import {
+  ApolloProvider,
+  ApolloClient,
+  InMemoryCache,
+  HttpLink,
+  gql,
+} from '@apollo/client'
+
+const authContext = createContext()
+
+export function AuthProvider({ children }) {
+  const auth = useProvideAuth()
+
+  return (
+    <authContext.Provider value={auth}>
+      <ApolloProvider client={auth.createApolloClient()}>
+        {children}
+      </ApolloProvider>
+    </authContext.Provider>
+  )
+}
+
+export const useAuth = () => {
+  return useContext(authContext)
+}
+
+function useProvideAuth() {
+  const [authToken, setAuthToken] = useState(null)
+
+  const getAuthHeaders = () => {
+    if (!authToken) return null
+
+    return {
+      authorization: `Bearer ${authToken}`,
+    }
+  }
+
+  function createApolloClient() {
+    const link = new HttpLink({
+      uri: 'http://localhost:4001/graphql',
+      headers: getAuthHeaders(),
+    })
+
+    return new ApolloClient({
+      link,
+      cache: new InMemoryCache(),
+    })
+  }
+
+  const signOut = () => {
+    setAuthToken(null)
+  }
+
+  const signIn = async ({ username, password }) => {
+    const client = createApolloClient()
+    const LoginMutation = gql`
+      mutation LoginMutation($username: String!, $password: String!) {
+        login(username: $username, password: $password) {
+          token
+        }
+      }
+    `
+    const result = await client.mutate({
+      mutation: LoginMutation,
+      variables: { username, password },
+    })
+
+    console.log(result)
+
+    if (result?.data?.login?.token) {
+      setAuthToken(result.data.login.token)
+    }
+  }
+
+  const isSignedIn = () => {
+    if (authToken) {
+      return true
+    } else {
+      return false
+    }
+  }
+
+  return {
+    createApolloClient,
+    signIn,
+    signOut,
+    isSignedIn,
+  }
+}