/
jsonBodyParser.js
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/
jsonBodyParser.js
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// Copyright 2012 Mark Cavage, Inc. All rights reserved.
'use strict';
var assert = require('assert-plus');
var errors = require('restify-errors');
var bodyReader = require('./bodyReader');
///--- API
/**
* Parses json body from the request.
*
* @public
* @function jsonBodyParser
* @param {Object} options - an options object
* @throws {InvalidContentError} on bad input
* @returns {Function} Handler
*/
function jsonBodyParser(options) {
assert.optionalObject(options, 'options');
var opts = options || {};
var override = opts.overrideParams;
function parseJson(req, res, next) {
// save original body on req.rawBody and req._body
req.rawBody = req._body = req.body;
var jsonPatternMatcher = new RegExp('^application/[a-zA-Z.]+\\+json');
var contentType = req.getContentType();
if (contentType !== 'application/json' || !req.body) {
if (!jsonPatternMatcher.test(contentType)) {
return next();
}
}
var params;
try {
params = JSON.parse(req.body, opts.reviver);
} catch (e) {
return next(
new errors.InvalidContentError(
'%s',
'Invalid JSON: ' + e.message
)
);
}
if (opts.mapParams === true) {
if (Array.isArray(params)) {
// if req.params exists, we have url params. we can't map an
// array safely onto req.params, throw an error.
if (
req.params &&
Object.keys(req.params).length > 0 &&
!(req.params instanceof Array)
) {
return next(
new errors.InternalServerError(
'Cannot map POST body of [Array array] onto ' +
'req.params'
)
);
}
req.params = params;
} else if (typeof params === 'object' && params !== null) {
// else, try to merge the objects
Object.keys(params).forEach(function forEach(k) {
var p = req.params[k];
if (p && !override) {
return;
}
req.params[k] = params[k];
});
} else {
// otherwise, do a wholesale stomp, no need to merge one by one.
req.params = params || req.params;
}
}
req.body = params;
return next();
}
var chain = [];
if (!opts.bodyReader) {
chain.push(bodyReader(opts));
}
chain.push(parseJson);
return chain;
}
module.exports = jsonBodyParser;