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41 lines
1.5 KiB
41 lines
1.5 KiB
"use strict"; |
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Object.defineProperty(exports, "__esModule", { value: true }); |
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exports.JSONP = void 0; |
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const polling_1 = 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_1.Polling { |
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/** |
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* JSON-P polling transport. |
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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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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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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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exports.JSONP = JSONP;
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