a little nicer wrt pep8

[sfa.git] / sfatables / runtime.py

diff --git a/sfatables/runtime.py b/sfatables/runtime.py
index 235c67f..f773b0d 100644 (file)
--- a/sfatables/runtime.py
+++ b/sfatables/runtime.py
@@ -1,50 +1,108 @@
-#!/usr/bin/python
+#!/usr/bin/env python3
 
 import sys
 import os
-import pdb
+
 import libxml2
+import libxslt
 
-from optparse import OptionParser
-from sfatables import commands
-from sfatables.globals import *
-from sfatables.commands.List import *
-from sfatables.xmlrule import *
+from sfatables.globals import sfatables_config
+from sfatables.commands.List import List
+from sfatables.xmlrule import XMLRule
 
 class SFATablesRules:
     def __init__(self, chain_name):
+        self.active_context = {}
         self.contexts = None # placeholder for rspec_manger
         self.sorted_rule_list = []
+        self.final_processor = '__sfatables_wrap_up__.xsl'
         chain_dir_path = os.path.join(sfatables_config,chain_name)
         rule_list = List().get_rule_list(chain_dir_path)
         for rule_number in rule_list:
-            self.sorted_rule_list.append(XMLRule(chain_name, rule_number))
+            self.sorted_rule_list = self.sorted_rule_list + [XMLRule(chain_name, rule_number)]
         return
 
+    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 = style.saveResultToString(result)
+        style.freeStylesheet()
+        doc.freeDoc()
+        result.freeDoc()
+
+        return stylesheet_result
 
     def set_context(self, request_context):
+        self.active_context = request_context
         return
 
+    def create_xml_node(self, name, context_dict):
+        node = libxml2.newNode(name)
+        for k in list(context_dict.keys()):
+            if (type(context_dict[k])==dict):
+                childNode = self.create_xml_node(k, context_dict[k])
+                node.addChild(childNode)
+            else:
+                childNode = libxml2.newNode(k)
+                childNode.addContent(context_dict[k])
+                node.addChild(childNode)
+        return node
+                
+    def add_request_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
+            requestNode = self.create_xml_node('request-context',self.active_context)
+            context[0].addChild(requestNode)
+        p.xpathFreeContext()
+        return doc
+
+    
     def apply(self, rspec):
-        intermediate_rspec = rspec
-        for rule in self.sorted_rule_list:
-            intermediate_rspec  = rule.apply_interpreted(intermediate_rspec)
-            if (rule.terminal):
-                break
+        if (self.sorted_rule_list):
+            doc = libxml2.parseDoc(rspec)
+            doc = self.add_request_context_to_rspec(doc)
+
+            intermediate_rspec = doc
+
+            for rule in self.sorted_rule_list:
+                (matched,intermediate_rspec) = rule.apply_interpreted(intermediate_rspec)
+                if (rule.terminal and matched):
+                    break
+
+            final_rspec = self.wrap_up(intermediate_rspec) 
+        else:
+            final_rspec = rspec
 
-        final_rspec = XMLRule().wrap_up(intermediate_rspec) 
         return final_rspec
 
+    def print_rules(self):
+        for rule in self.sorted_rule_list:
+            print(rule.processors)
+
 def main():
     incoming = SFATablesRules('INCOMING')
+    incoming.set_context({'sfa':{'user':{'hrn':'plc.princeton.sapanb'}}})
+
     outgoing = SFATablesRules('OUTGOING')
+    print("%d rules loaded for INCOMING chain"%len(incoming.sorted_rule_list))
+    incoming.print_rules()
 
-    print "%d rules loaded for INCOMING chain"%len(incoming.sorted_rule_list)
-    print "%d rules loaded for OUTGOING chain"%len(outgoing.sorted_rule_list)
+    print("%d rules loaded for OUTGOING chain"%len(outgoing.sorted_rule_list))
+    outgoing.print_rules()
 
     rspec = open(sys.argv[1]).read()
     newrspec = incoming.apply(rspec)
-    print newrspec
+    print(newrspec)
     return
 
 if __name__=="__main__":