60 lines
1.8 KiB
JavaScript
60 lines
1.8 KiB
JavaScript
// Protocol references:
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//
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// * http://tools.ietf.org/html/draft-hixie-thewebsocketprotocol-75
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// * http://tools.ietf.org/html/draft-hixie-thewebsocketprotocol-76
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// * http://tools.ietf.org/html/draft-ietf-hybi-thewebsocketprotocol-17
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var Draft75 = require('./protocol/draft75'),
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Draft76 = require('./protocol/draft76'),
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Hybi = require('./protocol/hybi'),
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Client = require('./protocol/client');
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var Protocol = {
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isSecureConnection: function(request) {
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if (request.headers['x-forwarded-proto']) {
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return request.headers['x-forwarded-proto'] === 'https';
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} else {
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return (request.connection && request.connection.authorized !== undefined) ||
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(request.socket && request.socket.secure);
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}
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},
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determineUrl: function(request) {
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var scheme = this.isSecureConnection(request) ? 'wss:' : 'ws:';
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return scheme + '//' + request.headers.host + request.url;
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},
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client: function(url, options) {
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options = options || {};
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options.masking = true;
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return new Client(url, options);
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},
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http: function(request, options) {
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options = options || {};
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options.requireMasking = true;
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var headers = request.headers,
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url = this.determineUrl(request);
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if (headers['sec-websocket-version'])
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return new Hybi(request, url, options);
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else if (headers['sec-websocket-key1'])
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return new Draft76(request, url, options);
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else
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return new Draft75(request, url, options);
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},
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isWebSocket: function(request) {
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var connection = request.headers.connection || '',
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upgrade = request.headers.upgrade || '';
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return request.method === 'GET' &&
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connection.toLowerCase().split(/\s*,\s*/).indexOf('upgrade') >= 0 &&
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upgrade.toLowerCase() === 'websocket';
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}
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};
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module.exports = Protocol;
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