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node_modules/connect/lib/middleware/json.js

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+
+/*!
+ * Connect - json
+ * Copyright(c) 2010 Sencha Inc.
+ * Copyright(c) 2011 TJ Holowaychuk
+ * MIT Licensed
+ */
+
+/**
+ * Module dependencies.
+ */
+
+var utils = require('../utils')
+  , _limit = require('./limit');
+
+/**
+ * noop middleware.
+ */
+
+function noop(req, res, next) {
+  next();
+}
+
+/**
+ * JSON:
+ *
+ * Parse JSON request bodies, providing the
+ * parsed object as `req.body`.
+ *
+ * Options:
+ *
+ *   - `strict`  when `false` anything `JSON.parse()` accepts will be parsed
+ *   - `reviver`  used as the second "reviver" argument for JSON.parse
+ *   - `limit`  byte limit disabled by default
+ *
+ * @param {Object} options
+ * @return {Function}
+ * @api public
+ */
+
+exports = module.exports = function(options){
+  var options = options || {}
+    , strict = options.strict !== false;
+
+  var limit = options.limit
+    ? _limit(options.limit)
+    : noop;
+
+  return function json(req, res, next) {
+    if (req._body) return next();
+    req.body = req.body || {};
+
+    if (!utils.hasBody(req)) return next();
+
+    // check Content-Type
+    if ('application/json' != utils.mime(req)) return next();
+
+    // flag as parsed
+    req._body = true;
+
+    // parse
+    limit(req, res, function(err){
+      if (err) return next(err);
+      var buf = '';
+      req.setEncoding('utf8');
+      req.on('data', function(chunk){ buf += chunk });
+      req.on('end', function(){
+        var first = buf.trim()[0];
+
+        if (0 == buf.length) {
+          return next(utils.error(400, 'invalid json, empty body'));
+        }
+        
+        if (strict && '{' != first && '[' != first) return next(utils.error(400, 'invalid json'));
+        try {
+          req.body = JSON.parse(buf, options.reviver);
+        } catch (err){
+          err.body = buf;
+          err.status = 400;
+          return next(err);
+        }
+        next();
+      });
+    });
+  };
+};