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59 lines
1.5 KiB
59 lines
1.5 KiB
4 years ago
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const Polling = require("./polling");
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const qs = require("querystring");
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const rDoubleSlashes = /\\\\n/g;
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const rSlashes = /(\\)?\\n/g;
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class JSONP extends Polling {
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/**
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* JSON-P polling transport.
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*
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* @api public
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*/
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constructor(req) {
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super(req);
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this.head = "___eio[" + (req._query.j || "").replace(/[^0-9]/g, "") + "](";
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this.foot = ");";
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}
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/**
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* Handles incoming data.
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* Due to a bug in \n handling by browsers, we expect a escaped string.
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*
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* @api private
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*/
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onData(data) {
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// we leverage the qs module so that we get built-in DoS protection
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// and the fast alternative to decodeURIComponent
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data = qs.parse(data).d;
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if ("string" === typeof data) {
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// client will send already escaped newlines as \\\\n and newlines as \\n
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// \\n must be replaced with \n and \\\\n with \\n
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data = data.replace(rSlashes, function(match, slashes) {
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return slashes ? match : "\n";
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});
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super.onData(data.replace(rDoubleSlashes, "\\n"));
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}
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}
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/**
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* Performs the write.
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*
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* @api private
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*/
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doWrite(data, options, callback) {
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// we must output valid javascript, not valid json
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// see: http://timelessrepo.com/json-isnt-a-javascript-subset
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const js = JSON.stringify(data)
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.replace(/\u2028/g, "\\u2028")
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.replace(/\u2029/g, "\\u2029");
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// prepare response
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data = this.head + js + this.foot;
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super.doWrite(data, options, callback);
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}
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}
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module.exports = JSONP;
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