Module: SimpleHmac::Helper

Included in:
ActionDispatch::Request, RestClient::Request
Defined in:
lib/simple-hmac/helper.rb

Instance Method Summary collapse

Instance Method Details

#authentication_headers(verb, content_type, payload, url, api_key, api_secret, options = {}) ⇒ Object 



21
22
23
24
25
26
27
28
29
30
31
32
33
34
 
# File 'lib/simple-hmac/helper.rb', line 21

def authentication_headers(verb, content_type, payload, url, api_key, api_secret, options={})
  options         = { auth_prefix: 'WIZYPAY' }.merge(options)
  auth_prefix     = options.delete :auth_prefix
  date = Time.now.httpdate
  content_type ||= 'text/plain'
  content_md5 = digest_md5(verb, payload)
  hmac_token = hmac_token(verb, content_type, content_md5, url, date, api_secret, options)
  {
    'Date' => date,
    'Content-Type' => content_type,
    'Content-MD5' => content_md5,
    'Authorization' => "#{auth_prefix} #{api_key}:#{hmac_token}"
  }
end

#digest_md5(verb, payload) ⇒ Object 



36
37
38
39
40
41
42
43
44
45
46
47
 
# File 'lib/simple-hmac/helper.rb', line 36

def digest_md5(verb, payload)
  return '' unless [:post, :put, :patch].include?(verb.downcase.to_sym)
  if payload.nil?
    body = ''
  elsif payload.respond_to? :read
    body = payload.read
    payload.instance_variable_get(:@stream).seek(0)
  else
    body = payload
  end
  Digest::MD5.base64digest(body)
end

#hmac_token(verb, content_type, content_md5, url, date, api_secret, options = {}) ⇒ Object 



8
9
10
11
12
13
14
15
 
# File 'lib/simple-hmac/helper.rb', line 8

def hmac_token(verb, content_type, content_md5, url, date, api_secret, options={})
  options = { separator: "\n", algorithm: 'sha256', include_verb: true }.merge(options)
  url_without_server = url.gsub(/https?:\/\/[^(,|\?|\/)]*/, '')
  data = [verb.upcase, content_type, content_md5, url_without_server, date]
  data.shift unless options[:include_verb]
  string_to_sign = data.join(options[:separator])
  sign_string(string_to_sign, api_secret, options[:algorithm])
end

#sign_string(string, secret, algorithm = 'sha256') ⇒ Object 



17
18
19
 
# File 'lib/simple-hmac/helper.rb', line 17

def sign_string(string, secret, algorithm = 'sha256')
  Base64.strict_encode64(OpenSSL::HMAC.digest(algorithm, secret, string))
end