// Copyright 2012 Mark Cavage, Inc. All rights reserved.
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'use strict';
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///--- Exports
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/**
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* JSONP formatter. like JSON, but with a callback invocation.
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* Unicode escapes line and paragraph separators.
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*
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* @public
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* @function formatJSONP
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* @param {Object} req - the request object
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* @param {Object} res - the response object
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* @param {Object} body - response body
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* @returns {String} data
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*/
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function formatJSONP(req, res, body) {
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if (!body) {
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res.setHeader('Content-Length', 0);
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return null;
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}
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if (Buffer.isBuffer(body)) {
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body = body.toString('base64');
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}
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var _cb = req.query.callback || req.query.jsonp;
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var data;
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if (_cb) {
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data =
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'typeof ' +
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_cb +
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" === 'function' && " +
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_cb +
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'(' +
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JSON.stringify(body) +
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');';
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} else {
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data = JSON.stringify(body);
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}
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data = data.replace(/\u2028/g, '\\u2028').replace(/\u2029/g, '\\u2029');
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res.setHeader('Content-Length', Buffer.byteLength(data));
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return data;
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}
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module.exports = formatJSONP;
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