implement ctx.origin

lib/context.js

@@ -176,6 +176,7 @@ delegate(proto, 'request')
   .access('query')
   .access('path')
   .access('url')
+  .getter('origin')
   .getter('href')
   .getter('subdomains')
   .getter('protocol')

lib/request.js

@@ -59,6 +59,17 @@ module.exports = {
     this.req.url = val;
   },
 
+  /**
+   * Get origin of URL.
+   *
+   * @return {String}
+   * @api public
+   */
+
+  get origin() {
+    return this.protocol + '://' + this.host;
+  },
+
   /**
    * Get full request URL.
    *
@@ -71,7 +82,7 @@ module.exports = {
     if (/^https?:\/\//i.test(this.originalUrl)) {
       return this.originalUrl;
     }
-    return this.protocol + '://' + this.host + this.originalUrl;
+    return this.origin + this.originalUrl;
   },
 
   /**

test/request/origin.js

@@ -0,0 +1,24 @@
+
+var Stream = require('stream');
+var http = require('http');
+var koa = require('../../');
+var context = require('../context');
+
+describe('ctx.origin', function(){
+  it('should return the origin of url', function(){
+    var socket = new Stream.Duplex();
+    var req = {
+      url: '/users/1?next=/dashboard',
+      headers: {
+        host: 'localhost'
+      },
+      socket: socket,
+      __proto__: Stream.Readable.prototype
+    };
+    var ctx = context(req);
+    ctx.origin.should.equal('http://localhost');
+    // change it also work
+    ctx.url = '/foo/users/1?next=/dashboard';
+    ctx.origin.should.equal('http://localhost');
+  })
+})