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gzip.js
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gzip.js
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/*
* Copyright (C) 2010 Chandra Sekar S
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
exports.api = {};
var util = require('util'),
ResponseWrapper = require('./wrapper.js').api.ResponseWrapper
try {
var compress = require('compress');
} catch(e) {
}
function GzipResponseWrapper(response, compressionLevel) {
ResponseWrapper.call(this, response);
}
util.inherits(GzipResponseWrapper, ResponseWrapper);
GzipResponseWrapper.prototype._createCompressor = function() {
this.compressor = new compress.GzipStream();
var self = this;
this.compressor.on('data', function(data) {
if(self._hasBody) {
self.response.write(data);
}
});
this.compressor.on('error', function(err) {
self.response.emit('error', err);
});
this.compressor.on('end', function() {
self.response.end();
});
};
GzipResponseWrapper.prototype.writeHead = function(statusCode, reasonPhrase,
headers) {
if(headers === undefined) {
headers = reasonPhrase;
reasonPhrase = undefined;
}
var self = this;
function writeHead() {
if(!reasonPhrase) {
self.response.writeHead(statusCode, headers);
} else {
self.response.writeHead(statusCode, reasonPhrase, headers);
}
}
if(!headers['content-encoding']) {
this._createCompressor();
delete headers['content-length'];
headers['transfer-encoding'] = 'chunked';
headers['content-encoding'] = 'gzip';
writeHead();
} else {
writeHead();
}
}
GzipResponseWrapper.prototype.write = function(chunk, encoding) {
if(this.compressor) {
this._hasBody = true;
return this.compressor.write(chunk, encoding);
} else {
return this.response.write(chunk, encoding);
}
}
GzipResponseWrapper.prototype.end = function(data, encoding) {
this.writable = false;
if(this.compressor) {
if(data) {
this._hasBody = true;
this.compressor.write(data, encoding);
this.compressor.close();
} else {
this.compressor.close();
}
} else {
this.response.end(data, encoding);
}
}
exports.GzipResponseWrapper = GzipResponseWrapper;
exports.api.gzipFilter = function(next) {
var acceptHeader = this.request.headers['accept-encoding'];
if(compress && acceptHeader && acceptHeader.indexOf('gzip') >= 0) {
this.response = new GzipResponseWrapper(this.response, 9);
}
next();
}