Support frozen strings with REXML

lib/onelogin/ruby-saml/authrequest.rb

@@ -64,7 +64,7 @@ def create_params(settings, params={})
         request_doc = create_authentication_xml_doc(settings)
         request_doc.context[:attribute_quote] = :quote if settings.double_quote_xml_attribute_values
 
-        request = ""
+        request = +""
         request_doc.write(request)
 
         Logging.debug "Created AuthnRequest: #{request}"

lib/onelogin/ruby-saml/logoutrequest.rb

@@ -61,7 +61,7 @@ def create_params(settings, params={})
         request_doc = create_logout_request_xml_doc(settings)
         request_doc.context[:attribute_quote] = :quote if settings.double_quote_xml_attribute_values
 
-        request = ""
+        request = +""
         request_doc.write(request)
 
         Logging.debug "Created SLO Logout Request: #{request}"

lib/onelogin/ruby-saml/metadata.rb

@@ -145,7 +145,7 @@ def embed_signature(meta_doc, settings)
       end
 
       def output_xml(meta_doc, pretty_print)
-        ret = ''
+        ret = +''
 
         # pretty print the XML so IdP administrators can easily see what the SP supports
         if pretty_print

lib/onelogin/ruby-saml/slo_logoutresponse.rb

@@ -70,7 +70,7 @@ def create_params(settings, request_id = nil, logout_message = nil, params = {},
         response_doc = create_logout_response_xml_doc(settings, request_id, logout_message, logout_status_code)
         response_doc.context[:attribute_quote] = :quote if settings.double_quote_xml_attribute_values
 
-        response = ""
+        response = +""
         response_doc.write(response)
 
         Logging.debug "Created SLO Logout Response: #{response}"

lib/onelogin/ruby-saml/utils.rb

@@ -32,7 +32,9 @@ class Utils
           (\d+)W                    # 8: Weeks
         )
       $)x.freeze
+
       UUID_PREFIX = '_'
+      @@prefix = '_'.freeze
 
       # Checks if the x509 cert provided is expired.
       #
@@ -252,6 +254,8 @@ def self.verify_signature(params)
       # @param status_message [Strig] StatusMessage value
       # @return [String] The status error message
       def self.status_error_msg(error_msg, raw_status_code = nil, status_message = nil)
+        error_msg = error_msg.dup
+
         unless raw_status_code.nil?
           if raw_status_code.include? "|"
             status_codes = raw_status_code.split(' | ')
@@ -400,11 +404,15 @@ def self.retrieve_plaintext(cipher_text, symmetric_key, algorithm)
       end
 
       def self.set_prefix(value)
-        UUID_PREFIX.replace value
+        @@prefix = value
+      end
+
+      def self.prefix
+        @@prefix
       end
 
       def self.uuid
-        "#{UUID_PREFIX}" + (RUBY_VERSION < '1.9' ? "#{@@uuid_generator.generate}" : "#{SecureRandom.uuid}")
+        "#{prefix}" + (RUBY_VERSION < '1.9' ? "#{@@uuid_generator.generate}" : "#{SecureRandom.uuid}")
       end
 
       # Given two strings, attempt to match them as URIs using Rails' parse method.  If they can be parsed,