Module: CPF

Defined in:
lib/validates_as_cpf.rb

Constant Summary collapse

BLACK_LIST = 
%w(12345678909 11111111111 22222222222 33333333333 44444444444
55555555555 66666666666 77777777777 88888888888 99999999999
00000000000)

Class Method Summary collapse

Class Method Details

.invalid?(cpf) ⇒ Boolean

Returns:

  • (Boolean) 


47
48
49
 
# File 'lib/validates_as_cpf.rb', line 47

def self.invalid?(cpf)
  !valid?(cpf)
end

.valid?(cpf) ⇒ Boolean

Returns:

  • (Boolean) 


6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
 
# File 'lib/validates_as_cpf.rb', line 6

def self.valid?(cpf)
  cpf = cpf.to_s

  # could be 10 or 11 digits or with mask 999.999.999-99
  if cpf !~ /^\d{10,11}$|\d{3}\.\d{3}\.\d{3}-\d{2}$/
    return false
  end

  cpf = cpf.scan(/\d/).collect(&:to_i)
  cpf.unshift(0) if cpf.length == 10

  # filter black list
  if BLACK_LIST.include? cpf.join
    return false
  end

  # calculate first digit
  sum = (0..8).inject(0) do |sum, i|
    sum + cpf[i] * (10 - i)
  end

  result = sum % 11
  result = result < 2 ? 0 : 11 - result

  if result != cpf[9]
    return false
  end

  # calculate second digit
  sum = (0..8).inject(0) do |sum, i|
    sum + cpf[i] * (11 - i)
  end

  sum += cpf[9] * 2

  result = sum % 11
  result = result < 2 ? 0 : 11 - result

  result == cpf[10]
end