response.etag and response.lastModified

lib/response.js

@@ -295,6 +295,61 @@ Response.prototype = {
     this.set('Content-Type', type);
   },
 
+  /**
+   * Set the Last-Modified date using a string or a Date.
+   *
+   *     this.response.lastModified = new Date();
+   *     this.response.lastModified = '2013-09-13';
+   *
+   * @param {String|Date} type
+   * @api public
+   */
+
+  set lastModified(val) {
+    if ('string' == typeof val) val = new Date(val);
+    this.set('Last-Modified', val.toUTCString());
+  },
+
+  /**
+   * Get the Last-Modified date in Date form, if it exists.
+   *
+   * @return {Date}
+   * @api public
+   */
+
+  get lastModified() {
+    var date = this.get('last-modified');
+    if (date) return new Date(date);
+  },
+
+  /**
+   * Set the ETag of a response.
+   * This will normalize the quotes if necessary.
+   *
+   *     this.response.etag = 'md5hashsum';
+   *     this.response.etag = '"md5hashsum"';
+   *     this.response.etag = 'W/"123456789"';
+   *
+   * @param {String} etag
+   * @api public
+   */
+
+  set etag(val) {
+    if (!/^(W\/)?".*"$/.test(val)) val = '"' + val + '"';
+    this.set('ETag', val);
+  },
+
+  /**
+   * Get the ETag of a response.
+   *
+   * @return {String}
+   * @api public
+   */
+
+  get etag() {
+    return this.get('etag');
+  },
+
   /**
    * Return the request mime type void of
    * parameters such as "charset".

test/response/etag.js

@@ -0,0 +1,28 @@
+
+var response = require('../response');
+
+describe('res.etag', function(){
+  it('should not modify an etag with quotes', function(){
+    var res = response();
+    res.etag = '"asdf"';
+    res.header.etag.should.equal('"asdf"');
+  })
+
+  it('should not modify a weak etag', function(){
+    var res = response();
+    res.etag = 'W/"asdf"';
+    res.header.etag.should.equal('W/"asdf"');
+  })
+
+  it('should add quotes around an etag if necessary', function(){
+    var res = response();
+    res.etag = 'asdf';
+    res.header.etag.should.equal('"asdf"');
+  })
+
+  it('should get the etag', function(){
+    var res = response();
+    res.set('etag', '"asdf"');
+    res.etag.should.equal('"asdf"');
+  })
+})

test/response/last-modified.js

@@ -0,0 +1,27 @@
+
+var response = require('../response');
+
+describe('res.lastModified', function(){
+  it('should set the header as a UTCString', function(){
+    var res = response();
+    var date = new Date();
+    res.lastModified = date;
+    res.header['last-modified'].should.equal(date.toUTCString());
+  })
+
+  it('should work with date strings', function(){
+    var res = response();
+    var date = new Date();
+    res.lastModified = date.toString();
+    res.header['last-modified'].should.equal(date.toUTCString());
+  })
+
+  it('should get the header as a Date', function(){
+    // Note: Date() removes milliseconds, but it's practically important.
+    var res = response();
+    var date = new Date();
+    res.lastModified = date;
+    (res.lastModified.getTime() / 1000)
+    .should.equal(Math.floor(date.getTime() / 1000));
+  })
+})