lib/fbgraph/canvas.rb in fbgraph-1.8.0 vs lib/fbgraph/canvas.rb in fbgraph-1.8.3

@@ -3,28 +3,25 @@
   class Canvas
     
     class << self
       def parse_signed_request(secret_id,request)
         encoded_sig, payload = request.split('.', 2)
-        sig = ""
-        urldecode64(encoded_sig).each_byte { |b|
-          sig << "%02x" % b
-        }
+        sig = urldecode64(encoded_sig)
         data = JSON.parse(urldecode64(payload))
-          if data['algorithm'].to_s.upcase != 'HMAC-SHA256'
+        if data['algorithm'].to_s.upcase != 'HMAC-SHA256'
           raise "Bad signature algorithm: %s" % data['algorithm']
         end
-        expected_sig = OpenSSL::HMAC.hexdigest('sha256', secret_id, payload)
+        expected_sig = OpenSSL::HMAC.digest('sha256', secret_id, payload)
         if expected_sig != sig
           raise "Bad signature"
         end
         data
       end
       
       private
       
       def urldecode64(str)
-        encoded_str = str.gsub('-','+').gsub('_','/')
+        encoded_str = str.tr('-_', '+/')
         encoded_str += '=' while !(encoded_str.size % 4).zero?
         Base64.decode64(encoded_str)
       end
     end