Added class method for signing requests

lib/auth-hmac.rb

@@ -21,6 +21,17 @@
 #
 class AuthHMAC
 
+  # Signs a request using a given access key id and secret.
+  #
+  def AuthHMAC.sign!(request, access_key_id, secret)
+    self.new(access_key_id => secret).sign!(request, access_key_id)
+  end
+
+  # Create an AuthHMAC instance using a given credential store.
+  #
+  # A credential store must respond to the [] method and return
+  # the secret for the access key id passed to [].
+  #
   def initialize(credential_store)
     @credential_store = credential_store
   end

spec/auth-hmac_spec.rb

@@ -4,6 +4,18 @@
 
 describe AuthHMAC do
   describe ".sign!" do
+    it "should sign using the key passed in as a parameter" do
+      date = "Thu, 10 Jul 2008 03:29:56 GMT"
+      request = Net::HTTP::Put.new("/path/to/put?foo=bar&bar=foo", 
+                                    'content-type' => 'text/plain', 
+                                    'content-md5' => 'blahblah', 
+                                    'date' => date)
+      AuthHMAC.sign!(request, "my-key-id", "secret")
+      request['Authorization'].should == "AuthHMAC my-key-id:71wAJM4IIu/3o6lcqx/tw7XnAJs="
+    end
+  end
+
+  describe "#sign!" do
     before(:each) do
       @store = mock('store')
       @store.stub!(:[]).and_return("")