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Mini Shell
Mini Shell
'use strict';
/**
* Module dependencies.
*/
const StringDecoder = require('string_decoder').StringDecoder;
const Stream = require('stream');
const zlib = require('zlib');
/**
* Buffers response data events and re-emits when they're unzipped.
*
* @param {Request} req
* @param {Response} res
* @api private
*/
exports.unzip = (req, res) => {
const unzip = zlib.createUnzip();
const stream = new Stream();
let decoder;
// make node responseOnEnd() happy
stream.req = req;
unzip.on('error', err => {
if (err && err.code === 'Z_BUF_ERROR') {
// unexpected end of file is ignored by browsers and curl
stream.emit('end');
return;
}
stream.emit('error', err);
});
// pipe to unzip
res.pipe(unzip);
// override `setEncoding` to capture encoding
res.setEncoding = type => {
decoder = new StringDecoder(type);
};
// decode upon decompressing with captured encoding
unzip.on('data', buf => {
if (decoder) {
const str = decoder.write(buf);
if (str.length) stream.emit('data', str);
} else {
stream.emit('data', buf);
}
});
unzip.on('end', () => {
stream.emit('end');
});
// override `on` to capture data listeners
const _on = res.on;
res.on = function(type, fn) {
if ('data' == type || 'end' == type) {
stream.on(type, fn);
} else if ('error' == type) {
stream.on(type, fn);
_on.call(res, type, fn);
} else {
_on.call(res, type, fn);
}
return this;
};
};
Zerion Mini Shell 1.0