Simplify Content-Type setting

README.md

@@ -35,13 +35,13 @@ app.use(bodyParser.xml());
 
 This will parse any XML-based request and place it as a JavaScript object on `req.body` for your route handlers to use.
 
-An XML-based request is determined by the value of the `Content-Type` header. If this ends in `/xml` or `/+xml`, it will be parsed as XML. For example, the following Content-Types will all match:
+An XML-based request is determined by the value of the `Content-Type` header. By default, any `Content-Type` header ending in `/xml` or `+xml` will be parsed as XML. For example, the following Content-Types will all match:
 
 - `text/xml`
 - `application/xml`
 - `application/rss+xml`
 
-But you can also set your own see Options:type
+If you need to match against a custom `Content-Type` header, pass in the `type` to match as an option (see below).
 
 ### Options
 
@@ -65,11 +65,9 @@ When set to `true`, then deflated (compressed) bodies will be inflated; when `fa
 
 Controls the maximum request body size. If this is a number, then the value specifies the number of bytes; if it is a string, the value is passed to the [bytes](https://www.npmjs.com/package/bytes) library for parsing. Defaults to `'100kb'`.
 
-
 #### type
 
-set your own valid Content-Type that will be parsed, can be a string or an array, already valid topics are '*/xml', '+xml'
-
+The expected `Content-Type` of the XML request to be parsed. Overrides the default content types, can be a String or Array of Strings.
 
 #### verify
 

index.js

@@ -2,37 +2,32 @@
 
 var xml2js = require('xml2js');
 
+var DEFAULT_TYPES = ['*/xml', '+xml'];
+
 module.exports = function(bodyParser) {
-  var xmlTypes = ['*/xml', '+xml'];
   if(bodyParser.xml) {
     // We already setup the XML parser.
     // End early.
     return;
   }
 
   function xml(options) {
-    var textParser;
     options = options || {};
-    if(options.type){
-      if(Array.isArray(options.type)){
-        xmlTypes = options.type.concat(xmlTypes);
-      }else if(typeof options.type === 'string'){
-        xmlTypes.push(options.type);
-      }
-      options.type = xmlTypes;
+
+    options.type = options.type || DEFAULT_TYPES;
+    if(!Array.isArray(options.type)) {
+      options.type = [options.type];
     }
 
-    options.type = xmlTypes;
-    textParser= bodyParser.text(options);
+    var textParser = bodyParser.text(options);
     return function xmlParser(req, res, next) {
-      var parser;
       // First, run the body through the text parser.
       textParser(req, res, function(err) {
         if(err) { return next(err); }
         if(typeof req.body !== 'string') { return next(); }
 
         // Then, parse as XML.
-        parser = new xml2js.Parser(options.xmlParseOptions);
+        var parser = new xml2js.Parser(options.xmlParseOptions);
         parser.parseString(req.body, function(err, xml) {
           if(err) {
             err.status = 400;