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"use strict";
/**
* Module dependencies.
*/
const _require = require('string_decoder'),
StringDecoder = _require.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 = (request, res) => {
const unzip = zlib.createUnzip();
const stream = new Stream();
let decoder; // make node responseOnEnd() happy
stream.req = request;
unzip.on('error', error => {
if (error && error.code === 'Z_BUF_ERROR') {
// unexpected end of file is ignored by browsers and curl
stream.emit('end');
return;
}
stream.emit('error', error);
}); // 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 string_ = decoder.write(buf);
if (string_.length > 0) stream.emit('data', string_);
} 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 (type === 'data' || type === 'end') {
stream.on(type, fn.bind(res));
} else if (type === 'error') {
stream.on(type, fn.bind(res));
_on.call(res, type, fn);
} else {
_on.call(res, type, fn);
}
return this;
};
};
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