OpenAsar/polyfills/request.js

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const https = require('https');
const querystring = require("querystring");
// Generic polyfill for "request" npm package, wrapper for https
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const nodeReq = ({ method, url, headers, qs, timeout, body, stream }) => new Promise((resolve, reject) => {
const fullUrl = `${url}${qs != null ? `?${querystring.stringify(qs)}` : ''}`; // With query string
let req;
try {
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req = https.request(fullUrl, { method, headers, timeout }, async (res) => {
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if (res.statusCode === 301 || res.statusCode === 302) { // Redirect, recall function
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return resolve(await nodeReq({ url: res.headers.location, method, headers, timeout, body, stream }));
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}
resolve(res);
});
} catch (e) {
return resolve(e);
}
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req.on('error', resolve);
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if (body) req.write(body); // Write POST body if included
req.end();
});
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const request = (...args) => {
// We have to use ...args because we have to support all of these possible args:
// request(url, callback)
// request(options, callback)
// request(url, options, callback)
let options, callback;
switch (args.length) {
case 3: // request(url, options, callback)
options = {
url: args[0],
...args[1]
};
callback = args[2];
break;
default: // request(url, callback) / request(options, callback)
options = args[0];
callback = args[1];
}
if (typeof options === 'string') {
options = {
url: options
};
}
console.log('[OpenAsar Request Polyfill]', options.url);
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const listeners = {};
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nodeReq(options).then(async (res) => {
const isError = !res.statusCode;
if (isError) {
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console.log('[OpenAsar Request Polyfill] Error:', res);
listeners['error']?.(res);
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callback?.(res, null, null);
return;
}
listeners['response']?.(res);
let body = '';
res.on('data', (chunk) => {
body += chunk;
listeners['data']?.(chunk);
});
await new Promise((resolve) => res.on('end', resolve)); // Wait to read full body
callback?.(undefined, res, body);
});
const ret = {
on: (type, handler) => {
listeners[type] = handler;
return ret; // Return self
}
};
return ret;
};
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for (const m of [ 'get', 'post', 'put', 'patch', 'delete', 'head', 'options' ]) {
request[m] = (url, callback) => request({ url, method: m.toUpperCase() }, callback);
}
request.del = request.delete; // Special case
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module.exports = request;