req.is(): make better

closes #105 and #106

docs/api/request.md

@@ -152,26 +152,24 @@ this.body = yield db.find('something');
 
 ### req.is(type)
 
-  Check if the incoming request contains the `Content-Type`
-  header field, and it contains the give mime `type`.
+  Check if the incoming request contains the "Content-Type"
+  header field, and it contains any of the give mime `type`s.
+  If there is no request body, `null` is returned.
+  If there is no content type, `false` is returned.
+  Otherwise, it returns the first `type` that matches.
 
 ```js
 // With Content-Type: text/html; charset=utf-8
-this.is('html');
-this.is('.html');
-this.is('text/html');
-this.is('text/*');
-// => true
+this.is('html'); // => 'html'
+this.is('text/html'); // => 'text/html'
+this.is('text/*', 'text/html'); // => 'text/*'
 
 // When Content-Type is application/json
-this.is('json');
-this.is('.json');
-this.is('application/json');
-this.is('application/*');
-// => true
+this.is('json', 'urlencoded'); // => 'json'
+this.is('application/json'); // => 'application/json'
+this.is('html', 'application/*'); // => 'application/*'
 
-this.is('html');
-// => false
+this.is('html'); // => false
 ```
 
 ### req.accepts(types)

lib/request.js

@@ -487,49 +487,63 @@ module.exports = {
 
   /**
    * Check if the incoming request contains the "Content-Type"
-   * header field, and it contains the give mime `type`.
+   * header field, and it contains any of the give mime `type`s.
+   * If there is no request body, `null` is returned.
+   * If there is no content type, `false` is returned.
+   * Otherwise, it returns the first `type` that matches.
    *
    * Examples:
    *
    *     // With Content-Type: text/html; charset=utf-8
-   *     this.is('html');
-   *     this.is('text/html');
-   *     this.is('text/*');
-   *     // => true
+   *     this.is('html'); // => 'html'
+   *     this.is('text/html'); // => 'text/html'
+   *     this.is('text/*', 'text/html'); // => 'text/*'
    *
    *     // When Content-Type is application/json
-   *     this.is('json');
-   *     this.is('application/json');
-   *     this.is('application/*');
-   *     // => true
+   *     this.is('json', 'urlencoded'); // => 'json'
+   *     this.is('application/json'); // => 'application/json'
+   *     this.is('html', 'application/*'); // => 'application/*'
    *
-   *     this.is('html');
-   *     // => false
+   *     this.is('html'); // => false
    *
-   * @param {String} type
-   * @return {Boolean}
+   * @param {String|Array} types...
+   * @return {String|false|null}
    * @api public
    */
 
-  is: function(type){
+  is: function(types){
+    // no request body
+    if (!(this.length || 'transfer-encoding' in this.header)) return null;
     var ct = this.type;
+    // request body without a content type?
     if (!ct) return false;
     ct = ct.split(';')[0];
-
-    // extension given
-    if (!~type.indexOf('/')) type = mime.lookup(type);
-
-    // type or subtype match
-    if (~type.indexOf('*')) {
-      type = type.split('/');
-      ct = ct.split('/');
-      if ('*' == type[0] && type[1] == ct[1]) return true;
-      if ('*' == type[1] && type[0] == ct[0]) return true;
-      return false;
+    if (!types) return ct;
+    if (!Array.isArray(types)) types = [].slice.call(arguments);
+    var type, mt, cts;
+    for (var i = 0; i < types.length; i++) {
+      type = types[i];
+      // exact match
+      if (type == ct) return type;
+      // convert to a valid mime type
+      switch (type) {
+        case 'urlencoded':
+          mt = 'application/x-www-form-urlencoded';
+          break;
+        default:
+          mt = ~type.indexOf('/') ? type : mime.lookup(type);
+      }
+      // mime types match
+      if (mt == ct) return type;
+      // type or subtype match
+      if (!~type.indexOf('*')) continue;
+      mt = mt.split('/');
+      cts = cts || ct.split('/');
+      if ('*' == mt[0] && mt[1] == cts[1]) return type;
+      if ('*' == mt[1] && mt[0] == cts[0]) return type;
     }
-
-    // exact match
-    return type == ct;
+    // no matches
+    return false;
   },
 
   /**

test/request/is.js

@@ -1,38 +1,96 @@
 
+var should = require('should');
 var context = require('../context');
 
 describe('ctx.is(type)', function(){
   it('should ignore params', function(){
     var ctx = context();
     ctx.header['content-type'] = 'text/html; charset=utf-8';
-    ctx.is('text/*').should.be.true;
+    ctx.header['transfer-encoding'] = 'chunked';
+
+    ctx.is('text/*').should.equal('text/*');
   })
 
-  describe('given a mime', function(){
-    it('should check the type', function(){
+  describe('when no body is given', function(){
+    it('should return null', function(){
+      var ctx = context();
+
+      should(ctx.is()).null;
+      should(ctx.is('image/*')).null;
+      should(ctx.is('text/*', 'image/*')).null;
+    })
+  })
+
+  describe('when no content type is given', function(){
+    it('should return false', function(){
+      var ctx = context();
+      ctx.header['transfer-encoding'] = 'chunked';
+
+      ctx.is().should.be.false;
+      ctx.is('image/*').should.be.false;
+      ctx.is('text/*', 'image/*').should.be.false;
+    })
+  })
+
+  describe('give no types', function(){
+    it('should return the mime type', function(){
       var ctx = context();
       ctx.header['content-type'] = 'image/png';
+      ctx.header['transfer-encoding'] = 'chunked';
 
-      ctx.is('image/png').should.be.true;
-      ctx.is('image/*').should.be.true;
-      ctx.is('*/png').should.be.true;
+      ctx.is().should.equal('image/png');
+    })
+  })
 
+  describe('given one type', function(){
+    it('should return the type or false', function(){
+      var ctx = context();
+      ctx.header['content-type'] = 'image/png';
+      ctx.header['transfer-encoding'] = 'chunked';
+
+      ctx.is('png').should.equal('png');
+      ctx.is('.png').should.equal('.png');
+      ctx.is('image/png').should.equal('image/png');
+      ctx.is('image/*').should.equal('image/*');
+      ctx.is('*/png').should.equal('*/png');
+
+      ctx.is('jpeg').should.be.false;
+      ctx.is('.jpeg').should.be.false;
       ctx.is('image/jpeg').should.be.false;
       ctx.is('text/*').should.be.false;
       ctx.is('*/jpeg').should.be.false;
     })
   })
 
-  describe('given an extension', function(){
-    it('should check the type', function(){
+  describe('given multiple types', function(){
+    it('should return the first match or false', function(){
       var ctx = context();
       ctx.header['content-type'] = 'image/png';
+      ctx.header['transfer-encoding'] = 'chunked';
 
-      ctx.is('png').should.be.true;
-      ctx.is('.png').should.be.true;
+      ctx.is('png').should.equal('png');
+      ctx.is('.png').should.equal('.png');
+      ctx.is('text/*', 'image/*').should.equal('image/*');
+      ctx.is('image/*', 'text/*').should.equal('image/*');
+      ctx.is('image/*', 'image/png').should.equal('image/*');
+      ctx.is('image/png', 'image/*').should.equal('image/png');
 
       ctx.is('jpeg').should.be.false;
       ctx.is('.jpeg').should.be.false;
+      ctx.is('text/*', 'application/*').should.be.false;
+      ctx.is('text/html', 'text/plain', 'application/json').should.be.false;
+    })
+  })
+
+  describe('when Content-Type: application/x-www-form-urlencoded', function(){
+    it('should match `urlencoded', function(){
+      var ctx = context();
+      ctx.header['content-type'] = 'application/x-www-form-urlencoded';
+      ctx.header['transfer-encoding'] = 'chunked';
+
+      ctx.is('urlencoded').should.equal('urlencoded');
+      ctx.is('json', 'urlencoded').should.equal('urlencoded');
+      ctx.is('urlencoded', 'json').should.equal('urlencoded');
     })
   })
 })