added error message support for the admin panel

Gemfile

@@ -2,6 +2,7 @@ source :rubygems
 
 gem 'sinatra'
 gem 'sinatra-support'
+gem 'rack-flash'
 gem 'haml'
 gem 'sass'
 gem 'compass'

Gemfile.lock

@@ -59,6 +59,8 @@ GEM
     haml (3.1.2)
     json (1.4.6)
     rack (1.3.0)
+    rack-flash (0.1.1)
+      rack
     sass (3.1.3)
     sinatra (1.2.6)
       rack (~> 1.1)
@@ -78,6 +80,7 @@ DEPENDENCIES
   data_mapper
   dm-postgres-adapter
   haml
+  rack-flash
   sass
   sinatra
   sinatra-support

admin.rb

@@ -1,9 +1,25 @@
 class Admin < Sinatra::Base
   set $settings
   enable :sessions
+  use Rack::Flash, :accessorize => [:error, :warning, :notice]
   set :haml, :layout => :admin_layout
 
   get '/' do
     haml :admin_index
   end
+
+  post '/login' do
+    account = Account.authenticate(params['username'], params['password'])
+    if account.nil?
+      flash.warning = 'wrong username or password'
+      redirect '/admin'
+    else
+      flash.notice = 'Login successful'
+      redirect '/admin'
+    end
+  end
+
+  get '/stylesheet.css' do
+    scss :admin_stylesheet
+  end
 end

libs.rb

@@ -8,6 +8,7 @@ require 'sass'
 require 'compass'
 require 'sinatra'
 require 'sinatra/support'
+require 'rack-flash'
 
 # markups
 require 'redcloth'

views/admin_layout.haml

@@ -3,9 +3,17 @@
   %head
     %title="zero-knowledge - Adminpanel"
     %link{:rel => 'stylesheet', :href => '/stylesheet.css', :type => 'text/css'}
+    %link{:rel => 'stylesheet', :href => '/admin/stylesheet.css', :type => 'text/css'}
     %script{:src => 'public/head.min.js'}
   %body
     #menu="Menue"
-    #content="Bereich oder so"
+    #messages
+      -unless flash.error.nil?
+        %p.error=flash.error
+      -unless flash.warning.nil?
+        %p.warning=flash.warning
+      -unless flash.notice.nil?
+        %p.notice=flash.notice
+    #content=yield
     %script
       ="head.js('http://ajax.googleapis.com/ajax/libs/jquery/1.6.1/jquery.min.js','/public/admin.js')"