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Description: Merbful Authentication.. In Slice Form
Homepage:
Clone URL: git://github.com/bond/merb-auth.git 
Added support for user-roles
  - added role-field to schemas
  - added admin? and admin_required methods

For more info, see ticket at lighthouseapp/feather: 
http://feather.lighthouseapp.com/projects/10532/tickets/21-support-for-non-admin
-users-roles#ticket-21-4
Daniel Bond (author)
Sat Jul 19 19:21:04 -0700 2008
commit  22381302ea7b1ca783f7c6509ee2024af0782f80
tree    2045a99f0bf8477166a9f7a773d8a12ef2f8403d
parent  925b8710a4fe5144eadb53bd016b315378a29797
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activerecord_generators/ma_migration/templates/schema/migrations/%time_stamp%_add_ma_user.rb 
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@@ -3,6 +3,7 @@ class AddMaUser < ActiveRecord::Migration
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     create_table "<%= table_name %>", :force => true do |t|
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       t.column :login,                      :string
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       t.column :email,                      :string
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+      t.column :role,                       :string, :limit => 40
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       t.column :crypted_password,           :string, :limit => 40
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       t.column :salt,                       :string, :limit => 40
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       t.column :created_at,                 :datetime
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datamapper_generators/ma_migration/templates/schema/migrations/add_ma_user.rb 
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@@ -4,6 +4,7 @@ migration 1, :create_ma_users_table do
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       column :id,                         Integer,  :serial   => true
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       column :login,                      String,   :nullable? => false
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       column :email,                      String,   :nullable? => false
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+      column :role,                       String
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       column :created_at,                 DateTime
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       column :updated_at,                 DateTime
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       column :activated_at,               DateTime
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lib/merb-auth/adapters/datamapper/model.rb 
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@@ -42,6 +42,7 @@ module MerbAuth
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             property :id,                         Integer,  :serial   => true
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             property :login,                      String,   :nullable => false, :length => 3..40, :unique => true
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             property :email,                      String,   :nullable => false, :unique => true
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+            property :role,                       String
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             property :created_at,                 DateTime
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             property :updated_at,                 DateTime
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             property :activated_at,               DateTime
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lib/merb-auth/controller/controller.rb 
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@@ -35,6 +35,11 @@ module MerbAuth
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         def authorized?
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           logged_in?
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         end
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+        
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+        def admin?
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+          return false unless(logged_in?)
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+          @current_ma_user.role == 'admin'
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+        end
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         # Filter method to enforce a login requirement.
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         #
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@@ -53,6 +58,18 @@ module MerbAuth
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         def login_required
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           authorized? || throw(:halt, :access_denied)
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         end
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+        
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+        # Filter method to enforce a login with admin role
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+        #
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+        # To require admin for all actions, use this in your controllers:
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+        #
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+        # before_filter :admin_required
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+        #
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+        # See also login_required method for more info on usage.
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+        #
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+        def admin_required
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+          admin? || throw(:halt, :access_denied)
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+        end
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         # Redirect as appropriate when an access request fails.
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         #

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