1require 'digest/sha1'
2class User < ActiveRecord::Base
3 # Virtual attribute for the unencrypted password
4 attr_accessor :password
5
6 validates_presence_of :login, :email
7 validates_presence_of :password, :if => :password_required?
8 validates_presence_of :password_confirmation, :if => :password_required?
9 validates_length_of :password, :within => 4..40, :if => :password_required?
10 validates_confirmation_of :password, :if => :password_required?
11 validates_length_of :login, :within => 3..40
12 validates_length_of :email, :within => 3..100
13 validates_uniqueness_of :login, :email, :case_sensitive => false
14 before_save :encrypt_password
15
16 # prevents a user from submitting a crafted form that bypasses activation
17 # anything else you want your user to change should be added here.
18 attr_accessible :login, :email, :password, :password_confirmation
19
20 # Authenticates a user by their login name and unencrypted password. Returns the user or nil.
21 def self.authenticate(login, password)
22 u = find_by_login(login) # need to get the salt
23 u && u.authenticated?(password) ? u : nil
24 end
25
26 # Encrypts some data with the salt.
27 def self.encrypt(password, salt)
28 Digest::SHA1.hexdigest("--#{salt}--#{password}--")
29 end
30
31 # Encrypts the password with the user salt
32 def encrypt(password)
33 self.class.encrypt(password, salt)
34 end
35
36 def authenticated?(password)
37 crypted_password == encrypt(password)
38 end
39
40 def remember_token?
41 remember_token_expires_at && Time.now.utc < remember_token_expires_at
42 end
43
44 # These create and unset the fields required for remembering users between browser closes
45 def remember_me
46 remember_me_for 2.weeks
47 end
48
49 def remember_me_for(time)
50 remember_me_until time.from_now.utc
51 end
52
53 def remember_me_until(time)
54 self.remember_token_expires_at = time
55 self.remember_token = encrypt("#{email}--#{remember_token_expires_at}")
56 save(false)
57 end
58
59 def forget_me
60 self.remember_token_expires_at = nil
61 self.remember_token = nil
62 save(false)
63 end
64
65 protected
66 # before filter
67 def encrypt_password
68 return if password.blank?
69 self.salt = Digest::SHA1.hexdigest("--#{Time.now.to_s}--#{login}--") if new_record?
70 self.crypted_password = encrypt(password)
71 end
72
73 def password_required?
74 crypted_password.blank? || !password.blank?
75 end
76
77
78end