/** * Near Social Bridge - Core * * This is part of a library that allows you to inject an external React App in a Widget created inside * Near Social as well as send and receive data from it. * * Basically, The View works as a Backend source. * * Visit https://github.com/wpdas/near-social-bridge to get to know how to use it */ // Error handlers if (!props.externalAppUrl) { return ( <p style={{ fontWeight: 600, color: "#AB2E28", fontFamily: "Courier new" }}> Error: "externalAppUrl" prop must be provided </p> ); } // (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, sessionStorageClone: {}, // (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", payload: { userInfo, initialPath, initialPayload, }, created_at: Date.now(), }, }); // Answer Factory const buildAnswer = (requestType, payload) => { return { from: "core", 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); }, }; }; }, }; // Message handler const onMessageHandler = (message) => { // Handles core calls if (message.type.includes("nsb:")) { requestsHandler(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); }; // CORE - REQUEST HANDLERS BELOW const requestsHandler = (message) => { switch (message.type) { case "nsb:navigation:sync-content-height": setIframeHeight(message.type, message.payload); break; 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:auth:get-user-info": getUserInfo(message.type, message.payload); break; } }; // [DON'T REMOVE]: Set thew new iFrame height based on the new screen/route const setIframeHeight = (requestType, payload) => { State.update({ iframeHeight: payload.height + 20 }); }; // [DON'T REMOVE]: Hydrate View session data with data provided by the External App const sessionStorageHydrateViewer = (requestType, payload) => { if (payload) { State.update({ sessionStorageClone: payload }); } const responseBody = buildAnswer(requestType, payload); Utils.sendMessage(responseBody); }; // [DON'T REMOVE]: Hydrate External App with data provided by the View const sessionStorageHydrateApp = (requestType, payload) => { const responseBody = buildAnswer(requestType, state.sessionStorageClone); Utils.sendMessage(responseBody); }; // [DON'T REMOVE]: Get user info const getUserInfo = (requestType, payload) => { Utils.promisify( () => Social.getr(`${accountId}/profile`), // profile info (res) => { const responseBody = buildAnswer(requestType, { accountId, profileInfo: res, }); Utils.sendMessage(responseBody); }, (err) => { console.error("error fetching profile data", err); } ); }; // CORE - REQUEST HANDLERS ABOVE return ( <div> <iframe className="w-100" style={{ height: `${state.iframeHeight}px` }} src={externalAppUrl} message={state.currentMessage} onMessage={onMessageHandler} /> </div> );