/** * This Widget is part of the NEAR Social Bridge library. * Visit https://github.com/wpdas/near-social-bridge to get to know more. */ // Crucial checks if (!props.externalAppUrl) { return ( <div> <p style={{ fontWeight: 600, color: "#AB2E28", fontFamily: "Courier new" }} > This Widget is part of the{" "} <a href="https://github.com/wpdas/near-social-bridge"> "near-social-bridge" </a>{" "} library that makes it possible to develop common ReactJS applications and inject them into the Widget having access to all Discovery API resources. </p> <p style={{ fontWeight: 600, color: "#AB2E28", fontFamily: "Courier new" }} > Learn more here:{" "} <a href="https://github.com/wpdas/near-social-bridge"> https://github.com/wpdas/near-social-bridge </a> </p> </div> ); } /** * Load React, React Dom and the Core Bridge library * * It's recommended to use VSCode to edit this code. * Save this code in the core.js file as well. */ const code = ` <script src="https://unpkg.com/react@18/umd/react.development.js" crossorigin></script> <script src="https://unpkg.com/react-dom@18/umd/react-dom.development.js" crossorigin></script> <script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/iframe-resizer/4.3.6/iframeResizer.contentWindow.js" ></script> <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/reseter.css/1.0.8/reseter.min.css"> <div id="bridge-root"></div> <script> // Viewer port let viewerPort // Outside of the component state controller let state = { externalAppUrl: '', initialPath: null, userInfo: null, initialPayload: {}, connectMessageSent: false, } // Core Component function NearSocialBridgeCore() { const [externalAppUrl, setExternalAppUrl] = React.useState(state.externalAppUrl) const [connectMessageSent, setConnectMessageSent] = React.useState(state.connectMessageSent) const [, setUserInfo] = React.useState(state.userInfo) React.useEffect(() => { const handler = (e) => { // Set the Viewer port if (!viewerPort && e.data.type === 'connect-view') { viewerPort = e.source setExternalAppUrl(e.data.externalAppUrl) setUserInfo(e.data.userInfo) state.externalAppUrl = e.data.externalAppUrl state.initialPath = e.data.initialPath state.userInfo = e.data.userInfo state.initialPayload = e.data.initialPayload } // When get a message from the View if (viewerPort && e.data.from === 'view') { // Is it message to the core? if (e.data.type.includes('core:')) { // process eventual message to core here return } // Send to external app sendMessage(e.data) } } window.addEventListener('message', handler) return () => { window.removeEventListener('message', handler) } }, []) const sendMessage = (message) => { var iframe = document.getElementById('coreIframe') iframe.contentWindow.postMessage(message, '*') } const sendMessageToView = (message) => { viewerPort.postMessage(message, '*') } // Answer Factory const buildAnswer = (requestType, payload) => { return { from: 'core', type: 'answer', requestType, payload, } } // Build connection payload const buildConnectionPayload = () => ({ type: 'connect', payload: { userInfo: state.userInfo, initialPath: state.initialPath, initialPayload: state.initialPayload, }, created_at: Date.now(), }) const onMessageHandler = (message) => { // Internal Request Handler if (message.data.from === 'external-app') { // Send to View sendMessageToView(message.data) } } function onLoadHandler() { // On load iframe if (!connectMessageSent) { setConnectMessageSent(true) state.connectMessageSent = true // On get msg from External App window.addEventListener('message', onMessageHandler, false) } // Send the welcome message (connects with the external app) const welcomePayload = buildConnectionPayload() sendMessage(welcomePayload) // Wait a bit and send the message again to ensure the app and scripts are loaded and ready setTimeout(() => { sendMessage(buildConnectionPayload()) }, 2000) } // Wait for the external app url to render the iframe if (!state.externalAppUrl) return null return React.createElement('iframe', { sandbox: 'allow-scripts allow-popups-to-escape-sandbox allow-popups', id: 'coreIframe', src: externalAppUrl, style: { border: 'none', width: '100%', margin: 0, padding: 0 }, onLoad: onLoadHandler, }) } const domContainer = document.querySelector('#bridge-root') const root = ReactDOM.createRoot(domContainer) root.render(React.createElement(NearSocialBridgeCore, {})) // iFrameResizer - auto resize the iframe to fit the child size // iFrameResize({ log: true }, '#coreIframe') </script> <script> iFrameResize({ log: true }, '#coreIframe') </script> `; // (i) Discovery API uses cached data structure const Utils = { /** * Send message */ sendMessage: (message) => { State.update({ currentMessage: message, }); }, /** * Call resolve or reject for a given caller * E.g: * var timeout = 5000 // 5sec * Utils.promisify(() => getCachedObject(), (res) => console.log(res), (err) => console.log(err), timeout) * * Default timeout is 10 seconds */ promisify: (caller, resolve, reject, _timeout) => { const timer = 1000; const timeout = _timeout || timer * 10; let timeoutCheck = 0; const find = () => { const response = caller(); if (response) { resolve(response); } else { if (timeoutCheck < timeout) { // try again setTimeout(find, 1000); timeoutCheck += timer; } else { reject(null); } } }; // Fist attempt find(); }, }; // External App Url const externalAppUrl = props.externalAppUrl; // User Info const accountId = context.accountId; const userInfo = { accountId }; // Initial Path const initialPath = props.path; // Initial Payload (optional) const initialPayload = props.initialPayload || {}; // Initial State State.init({ // (i) DON'T send async data, it's going to randonly fail // If you need to get new info, use "request" for that currentMessage: { type: "connect-view", externalAppUrl, userInfo, initialPath, initialPayload, }, }); // Answer Factory const buildAnswer = (requestType, payload) => { return { from: "view", type: "answer", requestType, payload, created_at: Date.now(), }; }; /** * Widget response factory - closure * * E.g: * const response = responseFactory.build() * response({type: 'request-type'}).send({myPayloadHere: 123}) */ const responseFactory = { build: () => { return (request) => { return { send: (payload) => { const responseBody = buildAnswer(request.type, payload); Utils.sendMessage(responseBody); }, }; }; }, }; const onMessageHandler = (message) => { // Handles core calls if (message.type.includes("nsb:")) { handlerCoreRequests(message); return; } // Handles Widget request calls: // - request: payload sent by External App // - response: method to send the answer back to the External App // - utils: Utils features like: promisify, ... const request = { type: message.type, payload: message.payload, }; const utils = { promisify: Utils.promisify, }; if (props.requestHandler) { props.requestHandler(request, responseFactory.build(), utils); } }; // REQUEST HANDLERS BELOW const handlerCoreRequests = (message) => { switch (message.type) { case "nsb:session-storage:hydrate-viewer": sessionStorageHydrateViewer(message.type, message.payload); break; case "nsb:session-storage:hydrate-app": sessionStorageHydrateApp(message.type, message.payload); break; case "nsb:navigation:sync-content-height": setIframeHeight(message.type, message.payload); break; case "nsb:auth:get-user-info": getUserInfo(message.type, message.payload); break; } }; const CORE_STORAGE_KEY = "app:storage"; // Store data const sessionStorageHydrateViewer = (requestType, payload) => { if (payload) { // store data Storage.privateSet(CORE_STORAGE_KEY, payload); const responseBody = buildAnswer(requestType, payload); Utils.sendMessage(responseBody); } }; // Retrieve stored data const sessionStorageHydrateApp = (requestType) => { Utils.promisify( // get stored data () => Storage.privateGet(CORE_STORAGE_KEY), (storageData) => { const responseBody = buildAnswer(requestType, storageData); Utils.sendMessage(responseBody); }, () => { // After 3 seconds, if no data is found, just send // an empty answer const responseBody = buildAnswer(requestType); Utils.sendMessage(responseBody); }, 3000 ); }; // Set thew new iFrame height based on the new screen/route const setIframeHeight = (requestType, payload) => { State.update({ iframeHeight: payload.height + 20 }); const responseBody = buildAnswer(requestType, {}); Utils.sendMessage(responseBody); }; // Get user info const getUserInfo = (requestType) => { // check if user is signed in if (!accountId) { const responseBody = buildAnswer(requestType, { error: "user is not signed in", }); Utils.sendMessage(responseBody); return; } Utils.promisify( () => Social.getr(`${accountId}/profile`), // profile info (res) => { const responseBody = buildAnswer(requestType, { accountId, profileInfo: res, }); Utils.sendMessage(responseBody); }, (err) => { console.log("error fetching profile data", err); } ); }; return ( <div> <iframe iframeResizer className="w-100" srcDoc={code} message={state.currentMessage} onMessage={onMessageHandler} /> </div> );