Class: UCenter::AuthCode

Inherits:

Object

• Object
• UCenter::AuthCode

Defined in:

lib/ucenter_authcode.rb

Overview

用类包装来防止方法间变量修改

Constant Summary

KeyLength =

4

Instance Method Summary

• #authcode(key, string) ⇒ Object

  参考 github.com/daxingplay/dokuwiki_ucenter/blob/master/api/uc.php#L295.

• #microtime ⇒ Object

Instance Method Details

#authcode(key, string) ⇒ Object

参考 github.com/daxingplay/dokuwiki_ucenter/blob/master/api/uc.php#L295

# File 'lib/ucenter_authcode.rb', line 16

def authcode key, string
  # 拆分key，并各自做md5
  key = md5(key)
  key_left, key_right = md5(key[0, 16]), md5(key[16, 16])

  # 拆分string auth和content部分
  string_auth, string_content = string[0, KeyLength], string[KeyLength..-1]

  # 从key_crypt抽取box
  key_crypt = key_left + md5(key_left + string_auth)
  key_crypt_length = key_crypt.length
  rndkey = []
  0.upto(255) do |i|
    rndkey[i] = (key_crypt[i % key_crypt_length]).ord
  end
  a = b = 0
  box = (0..255).to_a
  while b < 256 do
    a = (a + box[b] + rndkey[b]) % 256
    box[b], box[a] = box[a], box[b]
    b +=1
  end

  # 联合key_crypt和key_content解密出result
  string_content_ords = base64_url_decode(string_content).bytes.to_a
  string_content_ords_length = string_content_ords.length
  a = b = string_idx = 0
  result = ""
  while string_idx < string_content_ords_length
    a = (a + 1) % 256
    b = (b + box[a]) % 256
    box[a], box[b] = box[b], box[a]
    result << (string_content_ords[string_idx] ^ (box[(box[a] + box[b]) % 256])).chr
    string_idx +=1
  end

  result_time_valided = (result[0, 10] == '0'*10) || (result[0, 10].to_i - Time.now.to_i  >  0)
  result_string_valided = result[10, 16] == md5("#{result[26..-1]}#{key_right}")[0, 16] # 重新加密和string对比验证
  if (result_time_valided  && result_string_valided)
    return result[26..-1]
  else
    return ''
  end
end

#microtime ⇒ Object

# File 'lib/ucenter_authcode.rb', line 61

def microtime
  epoch_mirco = Time.now.to_f
  epoch_full = Time.now.to_i
  epoch_fraction = epoch_mirco - epoch_full
  epoch_fraction.to_s + ' ' + epoch_full.to_s
end