jsforce/lib/browser/jsonp.js

Salesforce API Library for JavaScript

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
/**
 *
 */
const stream_1 = require("stream");
let _index = 0;
async function processJsonpRequest(params, jsonpParam, timeout) {
    if (params.method.toUpperCase() !== 'GET') {
        throw new Error('JSONP only supports GET request.');
    }
    _index += 1;
    const cbFuncName = `_jsforce_jsonpCallback_${_index}`;
    const callbacks = window;
    let url = params.url;
    url += url.indexOf('?') > 0 ? '&' : '?';
    url += `${jsonpParam}=${cbFuncName}`;
    const script = document.createElement('script');
    script.type = 'text/javascript';
    script.src = url;
    if (document.documentElement) {
        document.documentElement.appendChild(script);
    }
    let pid;
    try {
        const res = await new Promise((resolve, reject) => {
            pid = setTimeout(() => {
                reject(new Error('JSONP call time out.'));
            }, timeout);
            callbacks[cbFuncName] = resolve;
        });
        return {
            statusCode: 200,
            headers: { 'content-type': 'application/json' },
            body: JSON.stringify(res),
        };
    }
    finally {
        clearTimeout(pid);
        if (document.documentElement) {
            document.documentElement.removeChild(script);
        }
        delete callbacks[cbFuncName];
    }
}
function createRequest(jsonpParam = 'callback', timeout = 10000) {
    return (params) => {
        const stream = new stream_1.Transform({
            transform(chunk, encoding, callback) {
                callback();
            },
            flush() {
                (async () => {
                    const response = await processJsonpRequest(params, jsonpParam, timeout);
                    stream.emit('response', response);
                    stream.emit('complete', response);
                    stream.push(response.body);
                    stream.push(null);
                })();
            },
        });
        stream.end();
        return stream;
    };
}
exports.default = {
    supported: typeof window !== 'undefined' && typeof document !== 'undefined',
    createRequest,
};