class Geocoder::Lookup::GooglePremier

def query_url(query, reverse = false)
  params = {
    (reverse ? :latlng : :address) => query,
    :sensor => 'false',
    :language => Geocoder::Configuration.language,
    :client => Geocoder::Configuration.api_key[1],
    :channel => Geocoder::Configuration.api_key[2]
  }.reject{ |key, value| value.nil? }
  path = "/maps/api/geocode/json?#{hash_to_query(params)}"
  "#{protocol}://maps.googleapis.com#{path}&signature=#{sign(path)}"
end

def sign(string)
  raw_private_key = url_safe_base64_decode(Geocoder::Configuration.api_key[0])
  digest = OpenSSL::Digest::Digest.new('sha1')
  raw_signature = OpenSSL::HMAC.digest(digest, raw_private_key, string)
  url_safe_base64_encode(raw_signature)
end

def url_safe_base64_decode(base64_string)
  Base64.decode64(base64_string.tr('-_', '+/'))
end

def url_safe_base64_encode(raw)
  Base64.encode64(raw).tr('+/', '-_').strip
end