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每天一劑Rails良藥之Authentication

2010-01-14 07:03:49 作者: 來源:

今天我們來看看Rails怎么處理登錄認證
雖然Rails有很多登錄認證的插件，但是我們可以自己動手豐衣足食

1，db/migrate/001_add_user_table.rb

Java代碼

class AddUserTable < ActiveRecord::Migration
def self.up
create_table :users do |t|
t.column :username, :string
t.column :password_salt, :string
t.column :password_hash, :string
end
end
def self.down
drop_table :users
end
end

class AddUserTable < ActiveRecord::Migration
  def self.up
    create_table :users do |t|
      t.column :username, :string
      t.column :password_salt, :string
      t.column :password_hash, :string
    end
  end

  def self.down
    drop_table :users
  end
end

2，app/models/user.rb

Java代碼

class User < ActiveRecord::Base
validates_uniqueness_of :username
def password=(pass)
salt = [Array.new(6){rand(256).chr}.join].pack("m").chomp
self.password_salt, self.password_hash = salt, Digest::SHA256.hexdigest(pass + salt)
end
def self.authenticate(username, password)
user = User.find(:first, :conditions => ['username = ?', username])
if user.blank? || Digest::SHA256.hexdigest(password + user.password_salt) != user.password_hash
raise "Username or password invalid"
end
user
end
end

class User < ActiveRecord::Base
  validates_uniqueness_of :username

  def password=(pass)
    salt = [Array.new(6){rand(256).chr}.join].pack("m").chomp
    self.password_salt, self.password_hash = salt, Digest::SHA256.hexdigest(pass + salt)
  end

  def self.authenticate(username, password)
    user = User.find(:first, :conditions => ['username = ?', username])
    if user.blank? || Digest::SHA256.hexdigest(password + user.password_salt) != user.password_hash
      raise "Username or password invalid"
    end
    user
  end
end

3，app/controllers/admin_controller.rb

Java代碼

class AdminController < ApplicationController
before_filter :check_authentication, :except => [:signin_form, :signin]
def check_authentication
unless session[:user]
session[:intended_action] = action_name
redirect_to :action => :signin_form
end
end
def signin
session[:user] = User.authenticate(params[:username], params[:password]).id
redirect_to :action => session[:intended_action]
end
def signout
session[:user] = nil
redirect_to home_url
end
end

class AdminController < ApplicationController
  before_filter :check_authentication, :except => [:signin_form, :signin]

  def check_authentication
    unless session[:user]
      session[:intended_action] = action_name
      redirect_to :action => :signin_form
    end
  end

  def signin
    session[:user] = User.authenticate(params[:username], params[:password]).id
    redirect_to :action => session[:intended_action]
  end

  def signout
    session[:user] = nil
    redirect_to home_url
  end

end

4，app/views/sign_form.rhtml

Java代碼

<html>
<head>
<title>Signin for Admin Access</title>
</head>
<body>
<%= start_form_tag :action => "signin" %>
<label for="username">Username:</label>
<%= text_field_tag "username" %><br/>
<label for="password">Password:</label>
<%= text_field_tag "password" %><br/>
<%= submit_tag "Sign in" %>
<%= end_form_tag %>
</body>
</html>

<html>
  <head>
    <title>Signin for Admin Access</title>
  </head>
  <body>
    <%= start_form_tag :action => "signin" %>
      <label for="username">Username:</label>
      <%= text_field_tag "username" %><br/>
      <label for="password">Password:</label>
      <%= text_field_tag "password" %><br/>
      <%= submit_tag "Sign in" %>
    <%= end_form_tag %>
  </body>
</html>

我們也可以將check_authentication方法放到application.rb里面，供其他Controllers使用

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