// Crucial checks if (!props.externalAppUrl) { return ( <p style={{ fontWeight: 600, color: "#AB2E28", fontFamily: "Courier new" }}> Error: "externalAppUrl" prop must be provided </p> ); } /** * 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> <div id="bridge-root"></div> <script> // Viewer port let viewerPort // Outside of the component state controller let state = { externalAppUrl: '', initialPath: null, iframeHeight: 480, userInfo: null, initialPayload: {}, sessionStorageClone: {}, connectMessageSent: false, } // Core Component function NearSocialBridgeCore(props) { const [externalAppUrl, setExternalAppUrl] = React.useState(state.externalAppUrl) const [connectMessageSent, setConnectMessageSent] = React.useState(state.connectMessageSent) const [iframeHeight, setIframeHeight] = React.useState(state.iframeHeight) const [, setSessionStorageClone] = React.useState(state.sessionStorageClone) 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) setIframeHeight(e.data.initialIframeHeight || 480) setUserInfo(e.data.userInfo) state.externalAppUrl = e.data.externalAppUrl state.initialPath = e.data.initialPath state.userInfo = e.data.userInfo state.initialPayload = e.data.initialPayload state.iframeHeight = e.data.initialIframeHeight || 480 } // 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('myIframe') 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') { // Is to the Core if (message.data.type.includes('nsb:')) { internalRequestHandler(message.data) } else { // Is to the View // Send it straight to the View console.log('Chegou do EA', message.data) sendMessageToView(message.data) } } } /** * Core - Internal Request handlers * All core data "nsb" will pass here first * @param {*} message */ const internalRequestHandler = (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': syncContentHeight(message.type, message.payload) sendMessageToView(message) // The view need to handle it break case 'nsb:auth:get-user-info': sendMessageToView(message) // The view need to handle it break } } const sessionStorageHydrateViewer = (requestType, payload) => { if (payload) { setSessionStorageClone(payload) state.sessionStorageClone = payload } const responseBody = buildAnswer(requestType, payload) sendMessage(responseBody) } const sessionStorageHydrateApp = (requestType) => { const responseBody = buildAnswer(requestType, state.sessionStorageClone) sendMessage(responseBody) } const syncContentHeight = (requestType, payload) => { if (payload.height) { setIframeHeight(payload.height) state.iframeHeight = payload.height } const responseBody = buildAnswer(requestType) sendMessage(responseBody) } function onLoadHandler(e) { // On load iframe // On get msg from External App if (!connectMessageSent) { setConnectMessageSent(true) state.connectMessageSent = true 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', id: 'myIframe', src: externalAppUrl, style: { border: 'none', width: '100%', height: iframeHeight + 'px', margin: 0, padding: 0 }, onLoad: onLoadHandler, }) } const domContainer = document.querySelector('#bridge-root') const root = ReactDOM.createRoot(domContainer) root.render(React.createElement(NearSocialBridgeCore, {})) </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: * Utils.promisify(() => getCachedObject(), (res) => console.log(res), (err) => console.log(err)) */ promisify: (caller, resolve, reject) => { const timer = 1000; const 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 iframe height const initialIframeHeight = props.initialViewHeight || 500; // Initial Payload (optional) const initialPayload = props.initialPayload || {}; // Initial State State.init({ iframeHeight: initialIframeHeight, lastMsgSentAt: new Date(), // (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, initialIframeHeight, }, }); // 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) => { console.log("View Recebe", 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, }; props.requestHandler(request, responseFactory.build(), utils); }; // REQUEST HANDLERS BELOW // Todos os tipos "nsb" passam pelo core.js primeiro const handlerCoreRequests = (message) => { switch (message.type) { case "nsb:navigation:sync-content-height": setIframeHeight(message.type, message.payload); break; // NEW case "nsb:auth:get-user-info": getUserInfo(message.type, message.payload); break; // NEW } }; // [DON'T REMOVE]: Set thew new iFrame height based on the new screen/route const setIframeHeight = (requestType, payload) => { State.update({ iframeHeight: payload.height + 20 }); }; // NEW // [DON'T REMOVE] // Get user info const getUserInfo = (requestType, payload) => { // 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(`${accountId}/profile`), // profile info (res) => { const responseBody = buildAnswer(requestType, { accountId, profileInfo: res, }); Utils.sendMessage(responseBody); }, (err) => { console.log("error fetching profile data", err); } ); }; // NEW // REQUEST HANDLERS ABOVE return ( <div> <iframe className="w-100" style={{ height: `${state.iframeHeight}px` }} srcDoc={code} message={state.currentMessage} onMessage={onMessageHandler} /> </div> );