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08c1f79e1e
Update various parts of DevTools to account for the fact that the global "hook" might be undefined if DevTools didn't inject it (due to the page's `contentType`) it (due to the page's `contentType`)
116 lines
4.2 KiB
JavaScript
116 lines
4.2 KiB
JavaScript
/* global chrome */
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import nullthrows from 'nullthrows';
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import {installHook} from 'react-devtools-shared/src/hook';
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import {SESSION_STORAGE_RELOAD_AND_PROFILE_KEY} from 'react-devtools-shared/src/constants';
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import {sessionStorageGetItem} from 'react-devtools-shared/src/storage';
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function injectCode(code) {
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const script = document.createElement('script');
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script.textContent = code;
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// This script runs before the <head> element is created,
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// so we add the script to <html> instead.
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nullthrows(document.documentElement).appendChild(script);
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nullthrows(script.parentNode).removeChild(script);
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}
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let lastDetectionResult;
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// We want to detect when a renderer attaches, and notify the "background page"
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// (which is shared between tabs and can highlight the React icon).
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// Currently we are in "content script" context, so we can't listen to the hook directly
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// (it will be injected directly into the page).
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// So instead, the hook will use postMessage() to pass message to us here.
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// And when this happens, we'll send a message to the "background page".
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window.addEventListener('message', function(evt) {
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if (evt.source !== window || !evt.data) {
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return;
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}
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if (evt.data.source === 'react-devtools-detector') {
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lastDetectionResult = {
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hasDetectedReact: true,
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reactBuildType: evt.data.reactBuildType,
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};
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chrome.runtime.sendMessage(lastDetectionResult);
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} else if (evt.data.source === 'react-devtools-inject-backend') {
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const script = document.createElement('script');
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script.src = chrome.runtime.getURL('build/react_devtools_backend.js');
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document.documentElement.appendChild(script);
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script.parentNode.removeChild(script);
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}
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});
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// NOTE: Firefox WebExtensions content scripts are still alive and not re-injected
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// while navigating the history to a document that has not been destroyed yet,
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// replay the last detection result if the content script is active and the
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// document has been hidden and shown again.
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window.addEventListener('pageshow', function(evt) {
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if (!lastDetectionResult || evt.target !== window.document) {
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return;
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}
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chrome.runtime.sendMessage(lastDetectionResult);
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});
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const detectReact = `
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window.__REACT_DEVTOOLS_GLOBAL_HOOK__.on('renderer', function(evt) {
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window.postMessage({
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source: 'react-devtools-detector',
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reactBuildType: evt.reactBuildType,
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}, '*');
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});
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`;
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const saveNativeValues = `
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window.__REACT_DEVTOOLS_GLOBAL_HOOK__.nativeObjectCreate = Object.create;
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window.__REACT_DEVTOOLS_GLOBAL_HOOK__.nativeMap = Map;
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window.__REACT_DEVTOOLS_GLOBAL_HOOK__.nativeWeakMap = WeakMap;
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window.__REACT_DEVTOOLS_GLOBAL_HOOK__.nativeSet = Set;
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`;
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// If we have just reloaded to profile, we need to inject the renderer interface before the app loads.
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if (sessionStorageGetItem(SESSION_STORAGE_RELOAD_AND_PROFILE_KEY) === 'true') {
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const rendererURL = chrome.runtime.getURL('build/renderer.js');
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let rendererCode;
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// We need to inject in time to catch the initial mount.
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// This means we need to synchronously read the renderer code itself,
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// and synchronously inject it into the page.
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// There are very few ways to actually do this.
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// This seems to be the best approach.
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const request = new XMLHttpRequest();
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request.addEventListener('load', function() {
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rendererCode = this.responseText;
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});
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request.open('GET', rendererURL, false);
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request.send();
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injectCode(rendererCode);
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}
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// Inject a __REACT_DEVTOOLS_GLOBAL_HOOK__ global for React to interact with.
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// Only do this for HTML documents though, to avoid e.g. breaking syntax highlighting for XML docs.
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if ('text/html' === document.contentType) {
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injectCode(
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';(' +
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installHook.toString() +
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'(window))' +
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saveNativeValues +
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detectReact,
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);
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}
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if (typeof exportFunction === 'function') {
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// eslint-disable-next-line no-undef
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exportFunction(
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text => {
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// Call clipboard.writeText from the extension content script
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// (as it has the clipboardWrite permission) and return a Promise
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// accessible to the webpage js code.
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return new window.Promise((resolve, reject) =>
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window.navigator.clipboard.writeText(text).then(resolve, reject),
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);
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},
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window.wrappedJSObject.__REACT_DEVTOOLS_GLOBAL_HOOK__,
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{defineAs: 'clipboardCopyText'},
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);
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}
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