[New sample] Open Chrome API reference page (omnibox, alarms, messaging sample) (#848)

* First draft

* Rename folder

* Tweak comments

* Update index.html

* remove extra closing div

* Rename sw file

* Apply first round of @sebastianbenz suggestions

* Fix import

* Update popover

* Second tech review round

functional-samples/tutorial.open-api-reference/api-list.js

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+export default [
+  {
+    content: 'commands',
+    description:
+      'Use the <match>Commands API</match> to add a keyboard shortcuts.'
+  },
+  {
+    content: 'contextmenus',
+    description:
+      "Use the <match>ContextMenus API</match> to add a custom item to Chrome's context menu."
+  },
+  {
+    content: 'declarativeNetRequest',
+    description:
+      'Use the <match>DeclarativeNetRequest API</match> to block or modify network requests.'
+  },
+  {
+    content: 'downloads',
+    description:
+      'Use the <match>Downloads API</match> to programmatically manipulate downloads.'
+  },
+  {
+    content: 'i18n',
+    description: 'Use the <match>i18n API</match> to localize your extension'
+  },
+  {
+    content: 'identity',
+    description:
+      'Use the <match>Identity API</match> to get OAuth2 access tokens.'
+  },
+  {
+    content: 'notifications',
+    description:
+      'Use the <match>Notifications API</match> show notifications to users in the system tray.'
+  },
+  {
+    content: 'offscreen',
+    description:
+      'Use the <match>Offscreen API</match> to create and manage offscreen documents.'
+  },
+  {
+    content: 'omnibox',
+    description:
+      "Use the <match>Omnibox API</match> to register a keyword with Chrome's address bar."
+  },
+  {
+    content: 'permissions',
+    description:
+      'Use the <match>Permissions API</match> to request optional permissions at run time.'
+  },
+  {
+    content: 'runtime',
+    description:
+      'Use the <match>Runtime API</match> pass messages, manage extension lifecycle, and access other helper utils.'
+  },
+  {
+    content: 'scripting',
+    description:
+      'Use the <match>Scripting API</match> to execute scripts in different contexts.'
+  },
+  {
+    content: 'storage',
+    description:
+      'Use the <match>Storage API</match> to store, retrieve, and track changes to user data.'
+  },
+  {
+    content: 'tabs',
+    description:
+      'Use the <match>Tabs API</match> to create, update and manipulate tabs.'
+  },
+  {
+    content: 'topSites',
+    description:
+      'Use the <match>TopSites API</match> to access the most visited sites that are displayed on the new tab page.'
+  },
+  {
+    content: 'webNavigation',
+    description:
+      'Use the <match>WebNavigation API</match> to receive notifications about the status of navigation requests in-flight.'
+  }
+];

functional-samples/tutorial.open-api-reference/content.js

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+// Popover API https://chromestatus.com/feature/5463833265045504
+
+(async () => {
+  const nav = document.querySelector('.navigation-rail__links');
+
+  const { tip } = await chrome.runtime.sendMessage({ greeting: 'tip' });
+
+  const tipWidget = createDomElement(`
+    <button class="navigation-rail__link" popovertarget="tip-popover" popovertargetaction="show" style="padding: 0; border: none; background: none;>
+      <div class="navigation-rail__icon">
+        <svg class="icon" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" width="24" height="24" viewBox="0 0 24 24" fill="none"> 
+        <path d='M15 16H9M14.5 9C14.5 7.61929 13.3807 6.5 12 6.5M6 9C6 11.2208 7.2066 13.1599 9 14.1973V18.5C9 19.8807 10.1193 21 11.5 21H12.5C13.8807 21 15 19.8807 15 18.5V14.1973C16.7934 13.1599 18 11.2208 18 9C18 5.68629 15.3137 3 12 3C8.68629 3 6 5.68629 6 9Z'"></path>
+        </svg>
+      </div>
+      <span>Tip</span> 
+    </button>
+  `);
+
+  const popover = createDomElement(
+    `<div id='tip-popover' popover>${tip}</div>`
+  );
+
+  document.body.append(popover);
+  nav.append(tipWidget);
+})();
+
+function createDomElement(html) {
+  const dom = new DOMParser().parseFromString(html, 'text/html');
+  return dom.body.firstElementChild;
+}

functional-samples/tutorial.open-api-reference/manifest.json

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+{
+  "manifest_version": 3,
+  "name": "Open extension API reference",
+  "version": "1.0.0",
+  "icons": {
+    "16": "icon-16.png",
+    "128": "icon-128.png"
+  },
+  "background": {
+    "service_worker": "service-worker.js",
+    "type": "module"
+  },
+  "minimum_chrome_version": "102",
+  "omnibox": {
+    "keyword": "api"
+  },
+  "permissions": ["alarms", "storage"],
+  "content_scripts": [
+    {
+      "matches": ["https://developer.chrome.com/docs/extensions/reference/*"],
+      "js": ["content.js"]
+    }
+  ],
+  "host_permissions": ["https://extension-tips.glitch.me/*"]
+}

functional-samples/tutorial.open-api-reference/service-worker.js

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+import './sw-omnibox.js';
+import './sw-tips.js';

functional-samples/tutorial.open-api-reference/sw-omnibox.js

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+import { getApiSuggestions } from './sw-suggestions.js';
+
+console.log('sw-omnibox.js');
+
+// Initialize default API suggestions
+chrome.runtime.onInstalled.addListener(({ reason }) => {
+  if (reason === 'install') {
+    chrome.storage.local.set({
+      apiSuggestions: ['tabs', 'storage', 'scripting']
+    });
+  }
+});
+
+const URL_CHROME_EXTENSIONS_DOC =
+  'https://developer.chrome.com/docs/extensions/reference/';
+const NUMBER_OF_PREVIOUS_SEARCHES = 4;
+
+// Displays the suggestions after user starts typing
+chrome.omnibox.onInputChanged.addListener(async (input, suggest) => {
+  const { description, suggestions } = await getApiSuggestions(input);
+  await chrome.omnibox.setDefaultSuggestion({ description });
+  suggest(suggestions);
+});
+
+// Opens the reference page of the chosen API
+chrome.omnibox.onInputEntered.addListener((input) => {
+  chrome.tabs.create({ url: URL_CHROME_EXTENSIONS_DOC + input });
+  // Saves the latest keyword
+  updateHistory(input);
+});
+
+async function updateHistory(input) {
+  const { apiSuggestions } = await chrome.storage.local.get('apiSuggestions');
+  apiSuggestions.unshift(input);
+  apiSuggestions.splice(NUMBER_OF_PREVIOUS_SEARCHES);
+  await chrome.storage.local.set({ apiSuggestions });
+}

functional-samples/tutorial.open-api-reference/sw-suggestions.js

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+import apiList from './api-list.js';
+
+/**
+ * Returns a list of suggestions and a description for the default suggestion
+ */
+export async function getApiSuggestions(input) {
+  const suggestions = apiList.filter((api) => api.content.startsWith(input));
+
+  // return suggestions if any exist
+  if (suggestions.length) {
+    return {
+      description: 'Matching Chrome APIs',
+      suggestions: suggestions
+    };
+  }
+
+  // return past searches if no match was found
+  const { apiSuggestions } = await chrome.storage.local.get('apiSuggestions');
+  return {
+    description: 'No matches found. Choose from past searches',
+    suggestions: apiList.filter((item) => apiSuggestions.includes(item.content))
+  };
+}

functional-samples/tutorial.open-api-reference/sw-tips.js

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+console.log('sw-tips.js');
+
+// Fetch tip & save in storage
+const updateTip = async () => {
+  const response = await fetch('https://extension-tips.glitch.me/tips.json');
+  const tips = await response.json();
+  const randomIndex = Math.floor(Math.random() * tips.length);
+  await chrome.storage.local.set({ tip: tips[randomIndex] });
+};
+
+// Create a daily alarm and retrieves the first tip when extension is installed.
+chrome.runtime.onInstalled.addListener(({ reason }) => {
+  if (reason === 'install') {
+    chrome.alarms.create({ delayInMinutes: 1, periodInMinutes: 1440 });
+    updateTip();
+  }
+});
+
+// Retrieve tip of the day
+chrome.alarms.onAlarm.addListener(updateTip);
+
+// Send tip to content script via messaging
+chrome.runtime.onMessage.addListener((message, sender, sendResponse) => {
+  if (message.greeting === 'tip') {
+    chrome.storage.local.get('tip').then(sendResponse);
+    return true;
+  }
+});