feat(frontend): setup

frontend/src/App.js

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+import React from "react";
+import { Route, Router, Switch } from "react-router-dom";
+import NavBar from "./components/NavBar";
+import PrivateRoute from "./components/PrivateRoute";
+import Profile from "./views/Profile";
+import ExternalApi from "./views/ExternalApi";
+import history from "./utils/history";
+
+function App() {
+  return (
+    <div className="App">
+      <Router history={history}>
+        <header>
+          <NavBar />
+        </header>
+        <Switch>
+          <Route path="/" exact />
+          <PrivateRoute path="/profile" component={Profile} />
+          <PrivateRoute path="/external-api" component={ExternalApi} />
+        </Switch>
+      </Router>
+    </div>
+  );
+}
+
+export default App;

frontend/src/auth_config.json

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+{
+  "domain": "listory.eu.auth0.com",
+  "clientId": "pYSTOYOsmenpCYj6TsRNQ8dprlqoQTt3",
+  "audience": "https://listory.apricote.de/api/v1"
+}

frontend/src/components/NavBar.js

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+import React from "react";
+import { useAuth0 } from "../react-auth0-spa";
+import { Link } from "react-router-dom";
+
+const NavBar = () => {
+  const { isAuthenticated, loginWithRedirect, logout } = useAuth0();
+
+  return (
+    <div>
+      {!isAuthenticated && (
+        <button onClick={() => loginWithRedirect({})}>Log in</button>
+      )}
+
+      {isAuthenticated && <button onClick={() => logout()}>Log out</button>}
+
+      {isAuthenticated && (
+        <span>
+          <Link to="/">Home</Link>&nbsp;
+          <Link to="/profile">Profile</Link>
+          <Link to="/external-api">External API</Link>
+        </span>
+      )}
+    </div>
+  );
+};
+
+export default NavBar;

frontend/src/components/PrivateRoute.js

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+import React, { useEffect } from "react";
+import { Route } from "react-router-dom";
+import { useAuth0 } from "../react-auth0-spa";
+
+const PrivateRoute = ({ component: Component, path, ...rest }) => {
+  const { loading, isAuthenticated, loginWithRedirect } = useAuth0();
+
+  useEffect(() => {
+    if (loading || isAuthenticated) {
+      return;
+    }
+    const fn = async () => {
+      await loginWithRedirect({
+        appState: { targetUrl: path }
+      });
+    };
+    fn();
+  }, [loading, isAuthenticated, loginWithRedirect, path]);
+
+  const render = props =>
+    isAuthenticated === true ? <Component {...props} /> : null;
+
+  return <Route path={path} render={render} {...rest} />;
+};
+
+export default PrivateRoute;

frontend/src/index.js

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+import React from "react";
+import ReactDOM from "react-dom";
+import App from "./App";
+import * as serviceWorker from "./serviceWorker";
+import { Auth0Provider } from "./react-auth0-spa";
+import config from "./auth_config.json";
+import history from "./utils/history";
+
+// A function that routes the user to the right place
+// after login
+const onRedirectCallback = appState => {
+  history.push(
+    appState && appState.targetUrl
+      ? appState.targetUrl
+      : window.location.pathname
+  );
+};
+
+ReactDOM.render(
+  <Auth0Provider
+    domain={config.domain}
+    client_id={config.clientId}
+    redirect_uri={window.location.origin}
+    audience={config.audience}
+    onRedirectCallback={onRedirectCallback}
+  >
+    <App />
+  </Auth0Provider>,
+  document.getElementById("root")
+);
+
+serviceWorker.unregister();

frontend/src/react-auth0-spa.js

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+import React, { useState, useEffect, useContext } from "react";
+import createAuth0Client from "@auth0/auth0-spa-js";
+
+const DEFAULT_REDIRECT_CALLBACK = () =>
+  window.history.replaceState({}, document.title, window.location.pathname);
+
+export const Auth0Context = React.createContext();
+export const useAuth0 = () => useContext(Auth0Context);
+export const Auth0Provider = ({
+  children,
+  onRedirectCallback = DEFAULT_REDIRECT_CALLBACK,
+  ...initOptions
+}) => {
+  const [isAuthenticated, setIsAuthenticated] = useState();
+  const [user, setUser] = useState();
+  const [auth0Client, setAuth0] = useState();
+  const [loading, setLoading] = useState(true);
+  const [popupOpen, setPopupOpen] = useState(false);
+
+  useEffect(() => {
+    const initAuth0 = async () => {
+      const auth0FromHook = await createAuth0Client(initOptions);
+      setAuth0(auth0FromHook);
+
+      if (
+        window.location.search.includes("code=") &&
+        window.location.search.includes("state=")
+      ) {
+        const { appState } = await auth0FromHook.handleRedirectCallback();
+        onRedirectCallback(appState);
+      }
+
+      const isAuthenticated = await auth0FromHook.isAuthenticated();
+
+      setIsAuthenticated(isAuthenticated);
+
+      if (isAuthenticated) {
+        const user = await auth0FromHook.getUser();
+        setUser(user);
+      }
+
+      setLoading(false);
+    };
+    initAuth0();
+    // eslint-disable-next-line
+  }, []);
+
+  const loginWithPopup = async (params = {}) => {
+    setPopupOpen(true);
+    try {
+      await auth0Client.loginWithPopup(params);
+    } catch (error) {
+      console.error(error);
+    } finally {
+      setPopupOpen(false);
+    }
+    const user = await auth0Client.getUser();
+    setUser(user);
+    setIsAuthenticated(true);
+  };
+
+  const handleRedirectCallback = async () => {
+    setLoading(true);
+    await auth0Client.handleRedirectCallback();
+    const user = await auth0Client.getUser();
+    setLoading(false);
+    setIsAuthenticated(true);
+    setUser(user);
+  };
+  return (
+    <Auth0Context.Provider
+      value={{
+        isAuthenticated,
+        user,
+        loading,
+        popupOpen,
+        loginWithPopup,
+        handleRedirectCallback,
+        getIdTokenClaims: (...p) => auth0Client.getIdTokenClaims(...p),
+        loginWithRedirect: (...p) => auth0Client.loginWithRedirect(...p),
+        getTokenSilently: (...p) => auth0Client.getTokenSilently(...p),
+        getTokenWithPopup: (...p) => auth0Client.getTokenWithPopup(...p),
+        logout: (...p) => auth0Client.logout(...p)
+      }}
+    >
+      {children}
+    </Auth0Context.Provider>
+  );
+};

frontend/src/serviceWorker.js

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+// This optional code is used to register a service worker.
+// register() is not called by default.
+
+// This lets the app load faster on subsequent visits in production, and gives
+// it offline capabilities. However, it also means that developers (and users)
+// will only see deployed updates on subsequent visits to a page, after all the
+// existing tabs open on the page have been closed, since previously cached
+// resources are updated in the background.
+
+// To learn more about the benefits of this model and instructions on how to
+// opt-in, read https://bit.ly/CRA-PWA
+
+const isLocalhost = Boolean(
+  window.location.hostname === 'localhost' ||
+    // [::1] is the IPv6 localhost address.
+    window.location.hostname === '[::1]' ||
+    // 127.0.0.0/8 are considered localhost for IPv4.
+    window.location.hostname.match(
+      /^127(?:\.(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)){3}$/
+    )
+);
+
+export function register(config) {
+  if (process.env.NODE_ENV === 'production' && 'serviceWorker' in navigator) {
+    // The URL constructor is available in all browsers that support SW.
+    const publicUrl = new URL(process.env.PUBLIC_URL, window.location.href);
+    if (publicUrl.origin !== window.location.origin) {
+      // Our service worker won't work if PUBLIC_URL is on a different origin
+      // from what our page is served on. This might happen if a CDN is used to
+      // serve assets; see https://github.com/facebook/create-react-app/issues/2374
+      return;
+    }
+
+    window.addEventListener('load', () => {
+      const swUrl = `${process.env.PUBLIC_URL}/service-worker.js`;
+
+      if (isLocalhost) {
+        // This is running on localhost. Let's check if a service worker still exists or not.
+        checkValidServiceWorker(swUrl, config);
+
+        // Add some additional logging to localhost, pointing developers to the
+        // service worker/PWA documentation.
+        navigator.serviceWorker.ready.then(() => {
+          console.log(
+            'This web app is being served cache-first by a service ' +
+              'worker. To learn more, visit https://bit.ly/CRA-PWA'
+          );
+        });
+      } else {
+        // Is not localhost. Just register service worker
+        registerValidSW(swUrl, config);
+      }
+    });
+  }
+}
+
+function registerValidSW(swUrl, config) {
+  navigator.serviceWorker
+    .register(swUrl)
+    .then(registration => {
+      registration.onupdatefound = () => {
+        const installingWorker = registration.installing;
+        if (installingWorker == null) {
+          return;
+        }
+        installingWorker.onstatechange = () => {
+          if (installingWorker.state === 'installed') {
+            if (navigator.serviceWorker.controller) {
+              // At this point, the updated precached content has been fetched,
+              // but the previous service worker will still serve the older
+              // content until all client tabs are closed.
+              console.log(
+                'New content is available and will be used when all ' +
+                  'tabs for this page are closed. See https://bit.ly/CRA-PWA.'
+              );
+
+              // Execute callback
+              if (config && config.onUpdate) {
+                config.onUpdate(registration);
+              }
+            } else {
+              // At this point, everything has been precached.
+              // It's the perfect time to display a
+              // "Content is cached for offline use." message.
+              console.log('Content is cached for offline use.');
+
+              // Execute callback
+              if (config && config.onSuccess) {
+                config.onSuccess(registration);
+              }
+            }
+          }
+        };
+      };
+    })
+    .catch(error => {
+      console.error('Error during service worker registration:', error);
+    });
+}
+
+function checkValidServiceWorker(swUrl, config) {
+  // Check if the service worker can be found. If it can't reload the page.
+  fetch(swUrl, {
+    headers: { 'Service-Worker': 'script' }
+  })
+    .then(response => {
+      // Ensure service worker exists, and that we really are getting a JS file.
+      const contentType = response.headers.get('content-type');
+      if (
+        response.status === 404 ||
+        (contentType != null && contentType.indexOf('javascript') === -1)
+      ) {
+        // No service worker found. Probably a different app. Reload the page.
+        navigator.serviceWorker.ready.then(registration => {
+          registration.unregister().then(() => {
+            window.location.reload();
+          });
+        });
+      } else {
+        // Service worker found. Proceed as normal.
+        registerValidSW(swUrl, config);
+      }
+    })
+    .catch(() => {
+      console.log(
+        'No internet connection found. App is running in offline mode.'
+      );
+    });
+}
+
+export function unregister() {
+  if ('serviceWorker' in navigator) {
+    navigator.serviceWorker.ready.then(registration => {
+      registration.unregister();
+    });
+  }
+}

frontend/src/setupTests.js

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+// jest-dom adds custom jest matchers for asserting on DOM nodes.
+// allows you to do things like:
+// expect(element).toHaveTextContent(/react/i)
+// learn more: https://github.com/testing-library/jest-dom
+import '@testing-library/jest-dom/extend-expect';

frontend/src/utils/history.js

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+import { createBrowserHistory } from "history";
+export default createBrowserHistory();

frontend/src/views/ExternalApi.js

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+import React, { useState } from "react";
+import { useAuth0 } from "../react-auth0-spa";
+
+const ExternalApi = () => {
+  const [showResult, setShowResult] = useState(false);
+  const [apiMessage, setApiMessage] = useState("");
+  const { getTokenSilently } = useAuth0();
+
+  const callApi = async () => {
+    try {
+      const token = await getTokenSilently();
+
+      const response = await fetch("/api/v1/connections", {
+        headers: {
+          Authorization: `Bearer ${token}`
+        }
+      });
+
+      const responseData = await response.json();
+
+      setShowResult(true);
+      setApiMessage(responseData);
+    } catch (error) {
+      console.error(error);
+    }
+  };
+
+  return (
+    <>
+      <h1>External API</h1>
+      <button onClick={callApi}>Ping API</button>
+      {showResult && <code>{JSON.stringify(apiMessage, null, 2)}</code>}
+    </>
+  );
+};
+
+export default ExternalApi;

frontend/src/views/Profile.js

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+import React, { Fragment } from "react";
+import { useAuth0 } from "../react-auth0-spa";
+
+const Profile = () => {
+  const { loading, user } = useAuth0();
+
+  if (loading || !user) {
+    return <div>Loading...</div>;
+  }
+
+  return (
+    <Fragment>
+      <img src={user.picture} alt="Profile" />
+
+      <h2>{user.name}</h2>
+      <p>{user.email}</p>
+      <code>{JSON.stringify(user, null, 2)}</code>
+    </Fragment>
+  );
+};
+
+export default Profile;