From 9d06bd3024139f2bfee4722c7536ee4ffa99fe32 Mon Sep 17 00:00:00 2001
From: mguetlein <martin.guetlein@gmail.com>
Date: Thu, 20 Jan 2011 11:29:53 +0100
Subject: implemented new error handling, still TODO rdf-support, replace halts

---
 lib/error.rb | 60 +++++++++++++++++++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 55 insertions(+), 5 deletions(-)

(limited to 'lib/error.rb')

diff --git a/lib/error.rb b/lib/error.rb
index 87e1a5d..b72ce7e 100644
--- a/lib/error.rb
+++ b/lib/error.rb
@@ -1,11 +1,61 @@
-module OpenTox
 
-  class NotFoundError < RuntimeError
-    
+# adding additional fields to Exception class to format errors according to OT-API
+class Exception
+  attr_accessor :creator, :errorCause, :id
+end
+
+module OpenTox
+  
+  class NotAuthorizedError < Exception
   end
   
-  class BadRequestError < RuntimeError
-    
+  class NotFoundError < Exception
   end
   
+  class BadRequestError < Exception
+  end
+  
+  class RestCallError < Exception
+    attr_accessor :code, :body, :uri, :payload, :headers
+  end
+
+  class ErrorReport
+    
+    # formats error according to accept-header, yaml is default
+    # ( sets content-type in response accordingly )
+    # @param [Exception] error
+    # @param |Sinatra::Request, optional] request
+    # @param [Sinatra::Response, optiona,] response, optional to set content-type
+    # @return [String]  formated error
+    def self.format(error, request=nil, response=nil)
+      # sets current uri
+      error.creator = "#{request.env['rack.url_scheme']}://#{request.env['HTTP_HOST']}#{request.env['REQUEST_URI']}" if request
+      accept = request.env['HTTP_ACCEPT'].to_s if request
+      case accept
+      # when /rdf/
+      # TODO add error to rdf
+      when /html/
+        response['Content-Type'] = 'text/html' if response
+        OpenTox.text_to_html error.to_yaml
+      else
+        response['Content-Type'] = 'application/x-yaml' if response
+        error.to_yaml
+      end
+    end
+    
+    # trys to parse error from text
+    # @return [Exception] Exception if parsing sucessfull, nil otherwise
+    def self.parse( body )
+      begin
+        err = YAML.load(body)
+        if err and err.is_a?(Exception)
+          return err
+        else
+          return nil
+        end
+      rescue
+        return nil
+      end
+    end
+  end
 end
\ No newline at end of file
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