a little nicer wrt pep8

[sfa.git] / sfatables / xmlrule.py

diff --git a/sfatables/xmlrule.py b/sfatables/xmlrule.py
index df63c9a..b749147 100644 (file)
--- a/sfatables/xmlrule.py
+++ b/sfatables/xmlrule.py
@@ -1,14 +1,103 @@
+import sys,os
+
 import libxml2
-from sfatables.globals import *
+# allow to run sfa2wsdl if this is missing (for mac)
+try:import libxslt
+except: print("WARNING, could not import libxslt", file=sys.stderr)
+
+from sfatables.globals import sfatables_config
 
 class XMLRule:
-    rule_number = None
-    chain = None
-    xmldoc = None
+    def apply_processor(self, type, doc, output_xpath_filter=None):
+        processor = self.processors[type]
+
+        # XXX TO CLEAN UP
+        filepath = os.path.join(sfatables_config, 'processors', processor)
+        # XXX
+
+        styledoc = libxml2.parseFile(filepath)
+        style = libxslt.parseStylesheetDoc(styledoc)
+        result = style.applyStylesheet(doc, None)
+        if (output_xpath_filter):
+            p = result.xpathNewContext()
+            xpath_result = p.xpathEval(output_xpath_filter)
+            if (xpath_result == []):
+                raise Exception("Could not apply processor %s."%processor)
+
+            stylesheet_result = xpath_result
+            p.xpathFreeContext()
+        else:
+            stylesheet_result = result #style.saveResultToString(result)
+
+        style.freeStylesheet()
+        #doc.freeDoc()
+        #result.freeDoc()
+
+        return stylesheet_result
+
+    def wrap_up(self, doc):
+        filepath = os.path.join(sfatables_config, 'processors', self.final_processor)
+
+        if not os.path.exists(filepath):
+            raise Exception('Could not find final rule filter')
+
+        styledoc = libxml2.parseFile(filepath)
+        style = libxslt.parseStylesheetDoc(styledoc)
+        result = style.applyStylesheet(doc, None)
+        stylesheet_result = result#style.saveResultToString(result)
+        style.freeStylesheet()
+        #doc.freeDoc()
+        #result.freeDoc()
+
+        return stylesheet_result
+
+    def match(self, rspec):
+        match_result = self.apply_processor('match',rspec,"//result/@verdict") 
+        return (match_result[0].content=='True')
 
-    arguments = {'match':None,'target':None}
-    processors = {'match':None,'target':None}
-    context = {'match':None,'target':None}
+    def target(self, rspec):
+        target_result = self.apply_processor('target',rspec,None)
+        return target_result
+
+    def add_rule_context_to_rspec(self, doc):
+        p = doc.xpathNewContext()
+        context = p.xpathEval("//*")
+        if not context or context[0].name not in ['RSpec', 'rspec']:
+            raise Exception('Request is not an rspec')
+        else:
+            # Add the request context
+            matchNode = libxml2.newNode('match-context')
+            for match_argument in self.arguments['match']:
+                matchNode.addChild(match_argument)
+
+            targetNode = libxml2.newNode('target-context')
+            for target_argument in self.arguments['target']:
+                targetNode.addChild(target_argument)
+
+            context[0].addChild(matchNode)
+            context[0].addChild(targetNode)
+        p.xpathFreeContext()
+
+        return doc
+
+    def apply_interpreted(self, rspec):
+        rspec = self.add_rule_context_to_rspec(rspec)
+        # Interpreted
+        #
+        # output =
+        #    if (match(match_args, rspec)
+        #       then target(target_args, rspec)
+        #       else rspec
+        
+        if (self.match(rspec)):
+            return (True,self.wrap_up(self.target(rspec)))
+        else:
+            return (False,self.wrap_up(rspec))
+
+
+    def apply_compiled(self, rspec):
+        # Not supported yet
+        return None
 
     def load_xml_extension (self, type, chain, rule_number):
         filename = sfatables_config+"/"+chain+"/"+"sfatables-%d-%s"%(rule_number,type)
@@ -21,29 +110,32 @@ class XMLRule:
 
         processor = p.xpathEval('//processor/@filename')
 
+        context = p.xpathEval('//attributes/attribute[@terminal="yes"]')
+        if (context != []):
+            self.terminal = 1
+        
         self.processors[type] = processor[0].content
-        self.arguments[type] = p.xpathEval('//rule')
+        self.arguments[type] = p.xpathEval('//rule//argument[value!=""]')
 
         p.xpathFreeContext()
 
 
-    def wrap_rspec (self, type, rspec):
-        argument = self.arguments[type]
-        p = rspec.xmldoc.xpathNewContext()
-        root_node = p.xpathEval('/RSpec')
-        if (not root_node or not root_node):
-            raise Exception('An evil aggregate manager sent me a malformed RSpec. Please see the stack trace to identify it.')
-
-        root_node.addChild(arguments[type])
-        return rspec
-
-    def __init__(self, chain, rule_number):
+    def __init__(self, chain=None, rule_number=None):
+        self.rule_number = None
+        self.chain = None
+        self.xmldoc = None
+        self.terminal = 0
+        self.final_processor = '__sfatables_rule_wrap_up__.xsl'
 
-        self.load_xml_extension('match', chain, rule_number)
-        self.load_xml_extension('target',chain, rule_number)
-        self.rule_number = rule_number
-        self.chain = chain
+        self.arguments = {'match':None,'target':None}
+        self.processors = {'match':None,'target':None}
+        self.context = {'match':None,'target':None}
 
+        if (chain and rule_number):
+            self.load_xml_extension('match', chain, rule_number)
+            self.load_xml_extension('target',chain, rule_number)
+            self.rule_number = rule_number
+            self.chain = chain
         return
         
     def free(self):