Class: Grnds::Looker::Hmac::SignedUrlGenerator

Inherits:
Object
  • Object
show all
Defined in:
lib/grnds/looker/hmac.rb

Instance Method Summary collapse

Constructor Details

#initialize(config) ⇒ SignedUrlGenerator

Returns a new instance of SignedUrlGenerator.



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# File 'lib/grnds/looker/hmac.rb', line 13

def initialize(config)
  ENV['LOOKER_EMBED_SECRET'] || raise('no LOOKER_EMBED_SECRET provided')
  @config = config
end

Instance Method Details

#getUrl ⇒ Object 



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# File 'lib/grnds/looker/hmac.rb', line 18

def getUrl()

  secret = ENV['LOOKER_EMBED_SECRET']

  json_external_user_id = @config[:external_user_id].to_json
  json_first_name = @config[:first_name].to_json
  json_last_name = @config[:last_name].to_json
  json_permissions = @config[:permissions].to_json
  json_models = @config[:models].to_json
  json_access_filters = @config[:filters].to_json
  json_user_attributes = @config[:user_attributes].to_json

  path = @config[:path_root] + CGI.escape(@config[:embed_path])

  json_session_length = (@config[:session_length] || 86400).to_json
   = true.to_json

  json_current_time = Time.now.to_i.to_json
  json_nonce = SecureRandom.hex(16).to_json

  string_to_sign = ''
  string_to_sign += @config[:host] + "\n"
  string_to_sign += path + "\n"
  string_to_sign += json_nonce + "\n"
  string_to_sign += json_current_time + "\n"
  string_to_sign += json_session_length + "\n"
  string_to_sign += json_external_user_id + "\n"
  string_to_sign += json_permissions + "\n"
  string_to_sign += json_models + "\n"
  string_to_sign += json_user_attributes + "\n"
  string_to_sign += json_access_filters

  signature = Base64.encode64(
      OpenSSL::HMAC.digest(
          OpenSSL::Digest.new('sha1'),
          secret,
          string_to_sign.force_encoding('utf-8'))).strip

  query_params = {
      nonce: json_nonce,
      time: json_current_time,
      session_length: json_session_length,
      external_user_id: json_external_user_id,
      permissions: json_permissions,
      models: json_models,
      access_filters: json_access_filters,
      user_attributes: json_user_attributes,
      first_name: json_first_name,
      last_name: json_last_name,
      force_logout_login: ,
      signature: signature
  }

  query_items = []
  query_params.each_pair do |k,v|
    query_items << k.to_s + "=" + CGI.escape(v)
  end

  query_string = query_items.join('&')
  "https://" + @config[:host] + path + '?' + query_string + "\n"
end