Module: Shugoi::Utils

Defined in:
lib/shugoi/utils.rb

Class Method Summary collapse

Class Method Details

.base36_decode(str) ⇒ Object 



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# File 'lib/shugoi/utils.rb', line 38

def base36_decode(str)
  str.to_s.to_i(36)
end

.base36_encode(num) ⇒ Object 



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# File 'lib/shugoi/utils.rb', line 26

def base36_encode(num)
  return "0" if num.zero?
  alphabet = "0123456789abcdefghijklmnopqrstuvwxyz"
  out = +""
  n = num
  while n.positive?
    n, r = n.divmod(36)
    out.prepend(alphabet[r])
  end
  out
end

.escape_json_string(s) ⇒ Object 



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# File 'lib/shugoi/utils.rb', line 70

def escape_json_string(s)
  JSON.generate(s.to_s)[1..-2]
end

.hmac_hex(secret, payload) ⇒ Object 



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# File 'lib/shugoi/utils.rb', line 18

def hmac_hex(secret, payload)
  OpenSSL::HMAC.hexdigest("SHA256", secret.to_s, payload.to_s)
end

.leading_zero_bits(hex_digest) ⇒ Object

Nombre de bits à zéro en tête du digest hex (parité avec la fonction JS bits).



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# File 'lib/shugoi/utils.rb', line 43

def leading_zero_bits(hex_digest)
  leading = 0
  hex_digest.each_char do |c|
    nib = c.to_i(16)
    if nib.zero?
      leading += 4
      next
    end
    leading += nib.to_s(2).match(/^0*/)[0].length
    break
  end
  leading
end

.now_ms ⇒ Object 



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# File 'lib/shugoi/utils.rb', line 57

def now_ms
  (Time.now.to_f * 1000).to_i
end

.now_sec ⇒ Object 



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# File 'lib/shugoi/utils.rb', line 61

def now_sec
  Time.now.to_i
end

.secure_equals(a, b) ⇒ Object

Comparaison constant-time de deux hex strings.



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# File 'lib/shugoi/utils.rb', line 12

def secure_equals(a, b)
  return false unless a.is_a?(String) && b.is_a?(String)
  return false unless a.bytesize == b.bytesize
  OpenSSL.fixed_length_secure_compare(a, b)
end

.sha256_hex(str) ⇒ Object 



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# File 'lib/shugoi/utils.rb', line 22

def sha256_hex(str)
  OpenSSL::Digest::SHA256.hexdigest(str.to_s)
end

.unicode_encode(code) ⇒ Object

Encodage unicode (parité Node : chaque caractère décalé de +917504).



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# File 'lib/shugoi/utils.rb', line 66

def unicode_encode(code)
  code.each_codepoint.map { |cp| (917504 + cp).chr(Encoding::UTF_8) }.join
end