add app.keys support

docs/api/index.md

@@ -59,6 +59,26 @@ http.createServer(app.callback()).listen(3001);
   Add the given middleware function to this application. See [Middleware](#middleware) for
   more information.
 
+### app.keys=
+
+ Set signed cookie keys.
+  
+ These are passed to [KeyGrip](https://github.com/jed/keygrip),
+ however you may also pass your own `KeyGrip` instance. For
+ example the following are acceptable:
+
+```js 
+app.keys = ['im a newer secret', 'i like turtle'];
+app.keys = new KeyGrip(['im a newer secret', 'i like turtle'], 'sha256');
+```
+
+  These keys may be rotated and are used when signing cookies
+  with the `{ signed: true }` option:
+
+```js
+this.cookies.set('name', 'tobi', { signed: true });
+```
+
 ## Handling Requests
 
   Koa requests are manipulated using a `Context` object containing both a Koa `Request` and `Response` object. For more information on these view:

lib/application.js

@@ -10,6 +10,7 @@ var context = require('./context');
 var request = require('./request');
 var response = require('./response');
 var Cookies = require('cookies');
+var Keygrip = require('keygrip');
 var Stream = require('stream');
 var http = require('http');
 var co = require('co');
@@ -96,11 +97,42 @@ app.callback = function(){
 
   return function(req, res, next){
     var ctx = self.createContext(req, res);
-
     co.call(ctx, gen)(next || ctx.onerror);
   }
 };
 
+/**
+ * Set signed cookie keys.
+ * 
+ * These are passed to [KeyGrip](https://github.com/jed/keygrip),
+ * however you may also pass your own `KeyGrip` instance. For
+ * example the following are acceptable:
+ *
+ *   app.keys = ['im a newer secret', 'i like turtle'];
+ *   app.keys = new KeyGrip(['im a newer secret', 'i like turtle'], 'sha256');
+ *
+ * @param {Array|KeyGrip} keys
+ * @api public
+ */
+
+app.__defineSetter__('keys', function(keys){
+  var ok = Array.isArray(keys) || keys instanceof Keygrip;
+  if (!ok) throw new TypeError('app.keys must be an array or Keygrip');
+  if (!(keys instanceof Keygrip)) keys = new Keygrip(keys);
+  this._keys = keys;
+});
+
+/**
+ * Get `Keygrip` instance.
+ *
+ * @return {Keygrip}
+ * @api public
+ */
+
+app.__defineGetter__('keys', function(){
+  return this._keys;
+});
+
 /**
  * Initialize a new context.
  *
@@ -116,8 +148,8 @@ app.createContext = function(req, res){
   context.res = request.res = response.res = res;
   request.ctx = response.ctx = context;
   context.onerror = context.onerror.bind(context);
-  context.cookies = new Cookies(req, res);
   context.originalUrl = request.originalUrl = req.url;
+  context.cookies = new Cookies(req, res, this.keys);
   return context;
 }
 

package.json

@@ -27,7 +27,8 @@
     "fresh": "~0.2.0",
     "negotiator": "~0.3.0",
     "koa-compose": "~2.0.0",
-    "cookies": "~0.3.6"
+    "cookies": "~0.3.6",
+    "keygrip": "~0.2.4"
   },
   "devDependencies": {
     "bytes": "~0.2.1",

test/context/cookies.js

@@ -0,0 +1,81 @@
+
+var koa = require('../..')
+var request = require('supertest');
+
+describe('ctx.cookies.set()', function(){
+  it('should set an unsigned cookie', function(done){
+    var app = koa();
+
+    app.use(function *(next){
+      this.cookies.set('name', 'jon');
+      this.status = 204;
+    })
+
+    var server = app.listen();
+
+    request(server)
+    .get('/')
+    .expect(204)
+    .end(function(err, res){
+      if (err) return done(err);
+
+      res.headers['set-cookie'].some(function(cookie){
+        return /^name=/.test(cookie);
+      }).should.be.ok;
+
+      done();
+    })
+  })
+
+  describe('with .signed', function(){
+    describe('when no .keys are set', function(){
+      it('should error', function(done){
+        var app = koa();
+
+        app.use(function *(next){
+          try {
+            this.cookies.set('foo', 'bar', { signed: true });
+          } catch (err) {
+            this.body = err.message;
+          }
+        });
+
+        request(app.listen())
+        .get('/')
+        .expect('Cannot call method \'sign\' of undefined', done);
+      })
+    })
+
+    it('should send a signed cookie', function(done){
+      var app = koa();
+
+      app.keys = ['a', 'b'];
+
+      app.use(function *(next){
+        this.cookies.set('name', 'jon', { signed: true });
+        this.status = 204;
+      })
+
+      var server = app.listen();
+
+      request(server)
+      .get('/')
+      .expect(204)
+      .end(function(err, res){
+        if (err) return done(err);
+
+        var cookies = res.headers['set-cookie'];
+
+        cookies.some(function(cookie){
+          return /^name=/.test(cookie);
+        }).should.be.ok;
+
+        cookies.some(function(cookie){
+          return /^name\.sig=/.test(cookie);
+        }).should.be.ok;
+
+        done();
+      })
+    })
+  })
+})