merged

src/App.js

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+import React from 'react';
+import { BrowserRouter as Router, Route } from 'react-router-dom';
+import Home from './components/Home';
+import Header from './components/Header';
+
+const App = () => {
+  return (
+    <div className='App'>
+      <Header />
+      <Router>
+        <Route exact path='/' component={Home} />
+      </Router>
+    </div>
+  );
+};
+
+export default App;

src/components/Channel/ChannelEntry.js

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+import React from 'react';
+import ChannelList from './ChannelList';
+
+const ChannelEntry = props => {
+  const { clients, channel } = props;
+  const joined = [];
+  if (channel.totalClients > 0) {
+    clients.forEach(client => {
+      if (client.channelId === channel.id) joined.push(client);
+    });
+  }
+
+  return (
+    <>
+      {channel.name}
+      {joined.length > 0 && (
+        <ul>
+          {joined.map(e => (
+            <li key={e.databaseId}>{e.nickname}</li>
+          ))}
+        </ul>
+      )}
+      {channel.subchannels !== undefined && (
+        <ChannelList channels={channel.subchannels} clients={clients} />
+      )}
+    </>
+  );
+};
+
+export default ChannelEntry;

src/components/Channel/ChannelList.js

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+import React from 'react';
+
+import ChannelEntry from './ChannelEntry';
+
+const ChannelList = ({ channels, clients }) => {
+  return (
+    <ul className='channelList'>
+      {channels.map(channel => {
+        return (
+          <li key={channel.id}>
+            <ChannelEntry channel={channel} clients={clients} />
+          </li>
+        );
+      })}
+    </ul>
+  );
+};
+
+export default ChannelList;

src/components/Channel/ChannelView.js

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+import React from 'react';
+
+const ChannelView = ({ channel }) => {
+  return (
+    <div className='channel-view'>
+      <h2>{channel.name}</h2>
+      <ul>
+        <li>
+          <span>{`# ${channel.id}`}</span>
+          {channel.name}
+        </li>
+        {channel.totalClients >= 0 && (
+          <li>
+            <span>Users online</span>
+            {channel.totalClients}
+          </li>
+        )}
+        {channel.subchannels.length > 0 && (
+          <li>
+            <span>Subchannels:</span>
+          </li>
+        )}
+      </ul>
+    </div>
+  );
+};
+
+export default ChannelView;

src/components/Channel/Channels.js

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+import React, { Component } from 'react';
+import ApiService from '../../services/ApiService';
+import ChannelList from './ChannelList';
+
+class Channels extends Component {
+  constructor(props) {
+    super(props);
+    this.state = {
+      loaded: false,
+      channels: [],
+      clients: [],
+    };
+  }
+
+  componentDidMount() {
+    ApiService.fetchAllChannels().then(data => {
+      this.setState({
+        channels: data.channelJson,
+        clients: data.clientJson,
+        loaded: true,
+      });
+    });
+  }
+
+  render() {
+    const { loaded, channels, clients } = this.state;
+    if (!loaded) return <div className='loading'>Loading...</div>;
+    return <ChannelList channels={channels} clients={clients} />;
+  }
+}
+
+export default Channels;

src/components/Header.js

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+import React from 'react';
+
+const Header = () => {
+  return <div className='app-header'>Cliffbreak.de</div>;
+};
+
+export default Header;

src/components/Home.js

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+import React, { Component } from 'react';
+import Channels from './Channel/Channels';
+
+export default class Home extends Component {
+  render() {
+    return (
+      <div>
+        <Channels />
+      </div>
+    );
+  }
+}

src/index.js

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+import React from 'react';
+import ReactDOM from 'react-dom';
+import App from './App';
+import './index.scss';
+import * as serviceWorker from './serviceWorker';
+
+ReactDOM.render(<App />, document.getElementById('root'));
+
+// If you want your app to work offline and load faster, you can change
+// unregister() to register() below. Note this comes with some pitfalls.
+// Learn more about service workers: http://bit.ly/CRA-PWA
+serviceWorker.unregister();

src/index.scss

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+body {
+  margin: 0;
+  padding: 0;
+  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Oxygen",
+    "Ubuntu", "Cantarell", "Fira Sans", "Droid Sans", "Helvetica Neue",
+    sans-serif;
+  -webkit-font-smoothing: antialiased;
+  -moz-osx-font-smoothing: grayscale;
+  background-color: #4a4a4a;
+  font-size: 160%;
+  color: #fff
+}
+
+code {
+  font-family: source-code-pro, Menlo, Monaco, Consolas, "Courier New",
+    monospace;
+}
+
+.app-header {
+  text-align: center;
+  background-color: #282c34;
+  font-size: 1.6em;
+  padding: 0.5em 0;
+  color: white;
+}
+
+.channelList {
+  list-style: none
+}
+
+.channel-view {
+  background-color: green;
+  width: 20%;
+  height: auto;
+  margin: auto;
+}
+
+.channel-view ul {
+  text-align: left
+}

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]' ||
+    // 127.0.0.1/8 is 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)
+    .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();
+    });
+  }
+}

src/services/ApiService.js

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+const API_URL = 'https://ts.cliffbreak.de/v1/';
+
+class ApiService {
+  static async fetchAllChannels() {
+    const channelRes = await fetch(`${API_URL}channels`);
+    const clientRes = await fetch(`${API_URL}clients`);
+    const channelJson = await channelRes.json();
+    const clientJson = await clientRes.json();
+    return { channelJson, clientJson };
+  }
+}
+export default ApiService;