391 lines
14 KiB
Python
391 lines
14 KiB
Python
#!/usr/bin/env/python
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# -*- coding: utf-8 -*-
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###
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### Author: Chris Iatrou (ichrispa@core-vector.net)
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###
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### This program was created for educational purposes and has been
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### contributed to the open62541 project by the author. All licensing
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### terms for this source is inherited by the terms and conditions
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### specified for by the open62541 project (see the projects readme
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### file for more information on the LGPL terms and restrictions).
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###
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### This program is not meant to be used in a production environment. The
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### author is not liable for any complications arising due to the use of
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### this program.
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###
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from logger import *
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from ua_constants import *
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import tempfile
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import xml.dom.minidom as dom
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import os
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import string
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from collections import Counter
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from ua_namespace import opcua_node_id_t
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class preProcessDocument:
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originXML = '' # Original XML passed to the preprocessor
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targetXML = () # tuple of (fileHandle, fileName)
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nodeset = '' # Parsed DOM XML object
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parseOK = False;
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containedNodes = [] # contains tuples of (opcua_node_id_t, xmlelement)
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referencedNodes = [] # contains tuples of (opcua_node_id_t, xmlelement)
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namespaceOrder = [] # contains xmlns:sX attributed as tuples (int ns, string name)
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namespaceQualifiers = [] # contains all xmlns:XYZ qualifiers that might prefix value aliases (like "<uax:Int32>")
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referencedNamesSpaceUris = [] # contains <NamespaceUris> URI elements
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def __init__(self, originXML):
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self.originXML = originXML
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self.targetXML = tempfile.mkstemp(prefix=os.path.basename(originXML)+"_preProcessed-" ,suffix=".xml")
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self.parseOK = True
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self.containedNodes = []
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self.referencedNodes = []
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self.namespaceOrder = []
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self.referencedNamesSpaceUris = []
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self.namespaceQualifiers = []
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try:
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self.nodeset = dom.parse(originXML)
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if len(self.nodeset.getElementsByTagName("UANodeSet")) == 0 or len(self.nodeset.getElementsByTagName("UANodeSet")) > 1:
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log(self, "Document " + self.targetXML[1] + " contains no or more then 1 nodeset", LOG_LEVEL_ERROR)
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self.parseOK = False
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except:
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self.parseOK = False
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log(self, "Adding new document to be preprocessed " + os.path.basename(originXML) + " as " + self.targetXML[1], LOG_LEVEL_DEBUG)
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def clean(self):
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#os.close(self.targetXML[0]) Don't -> done to flush() after finalize()
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os.remove(self.targetXML[1])
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def getTargetXMLName(self):
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if (self.parseOK):
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return self.targetXML[1]
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return None
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def extractNamespaceURIs(self):
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""" extractNamespaceURIs
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minidom gobbles up <NamespaceUris></NamespaceUris> elements, without a decent
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way to reliably access this dom2 <uri></uri> elements (only attribute xmlns= are
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accessible using minidom). We need them for dereferencing though... This
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function attempts to do just that.
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returns: Nothing
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"""
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infile = open(self.originXML)
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foundURIs = False
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nsline = ""
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line = infile.readline()
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for line in infile:
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if "<namespaceuris>" in line.lower():
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foundURIs = True
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elif "</namespaceuris>" in line.lower():
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foundURIs = False
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nsline = nsline + line
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break
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if foundURIs:
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nsline = nsline + line
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if len(nsline) > 0:
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ns = dom.parseString(nsline).getElementsByTagName("NamespaceUris")
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for uri in ns[0].childNodes:
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if uri.nodeType != uri.ELEMENT_NODE:
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continue
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self.referencedNamesSpaceUris.append(uri.firstChild.data)
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infile.close()
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def analyze(self):
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""" analyze()
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analyze will gather information about the nodes and references contained in a XML File
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to facilitate later preprocessing stages that adresss XML dependency issues
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returns: No return value
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"""
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nodeIds = []
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ns = self.nodeset.getElementsByTagName("UANodeSet")
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# We need to find out what the namespace calls itself and other referenced, as numeric id's are pretty
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# useless sans linked nodes. There is two information sources...
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self.extractNamespaceURIs() # From <URI>...</URI> definitions
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for key in ns[0].attributes.keys(): # from xmlns:sX attributes
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if "xmlns:" in key: # Any key: we will be removing these qualifiers from Values later
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self.namespaceQualifiers.append(key.replace("xmlns:",""))
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if "xmlns:s" in key: # get a numeric nsId and modelname/uri
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self.namespaceOrder.append((int(key.replace("xmlns:s","")), ns[0].getAttribute(key)))
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# Get all nodeIds contained in this XML
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for nd in ns[0].childNodes:
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if nd.nodeType != nd.ELEMENT_NODE:
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continue
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if nd.hasAttribute(u'NodeId'):
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self.containedNodes.append( (opcua_node_id_t(nd.getAttribute(u'NodeId')), nd) )
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refs = nd.getElementsByTagName(u'References')[0]
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for ref in refs.childNodes:
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if ref.nodeType == ref.ELEMENT_NODE:
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self.referencedNodes.append( (opcua_node_id_t(ref.firstChild.data), ref) )
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log(self, "Nodes: " + str(len(self.containedNodes)) + " References: " + str(len(self.referencedNodes)), LOG_LEVEL_DEBUG)
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def getNamespaceId(self):
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""" namespaceId()
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Counts the namespace IDs in all nodes of this XML and picks the most used
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namespace as the numeric identifier of this data model.
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returns: Integer ID of the most propable/most used namespace in this XML
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"""
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max = 0;
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namespaceIdGuessed = 0;
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idDict = {}
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for ndid in self.containedNodes:
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if not idDict.has_key(ndid[0].ns):
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idDict[ndid[0].ns] = 1
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else:
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idDict[ndid[0].ns] = idDict[ndid[0].ns] + 1
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for entry in idDict:
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if idDict[entry] > max:
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max = idDict[entry]
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namespaceIdGuessed = entry
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log(self, "XML Contents are propably in namespace " + str(entry) + " (used by " + str(idDict[entry]) + " Nodes)", LOG_LEVEL_DEBUG)
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return namespaceIdGuessed
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def getReferencedNamespaceUri(self, nsId):
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""" getReferencedNamespaceUri
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returns an URL that hopefully corresponds to the nsId that was used to reference this model
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return: URI string corresponding to nsId
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"""
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# Might be the more reliable method: Get the URI from the xmlns attributes (they have numers)
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if len(self.namespaceOrder) > 0:
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for el in self.namespaceOrder:
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if el[0] == nsId:
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return el[1]
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# Fallback:
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# Some models do not have xmlns:sX attributes, but still <URI>s (usually when they only reference NS0)
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if len(self.referencedNamesSpaceUris) > 0 and len(self.referencedNamesSpaceUris) >= nsId-1:
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return self.referencedNamesSpaceUris[nsId-1]
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#Nope, not found.
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return ""
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def getNamespaceDependencies(self):
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deps = []
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for ndid in self.referencedNodes:
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if not ndid[0].ns in deps:
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deps.append(ndid[0].ns)
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return deps
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def finalize(self):
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outfile = self.targetXML[0]
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outline = self.nodeset.toxml()
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for qualifier in self.namespaceQualifiers:
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rq = qualifier+":"
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outline = outline.replace(rq.decode('UTF-8'), "")
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os.write(outfile, outline.encode('UTF-8'))
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os.close(outfile)
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def reassignReferencedNamespaceId(self, currentNsId, newNsId):
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""" reassignReferencedNamespaceId
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Iterates over all references in this document, find references to currentNsId and changes them to newNsId.
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NodeIds themselves are not altered.
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returns: nothing
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"""
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for refNd in self.referencedNodes:
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if refNd[0].ns == currentNsId:
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refNd[1].firstChild.data = refNd[1].firstChild.data.replace("ns="+str(currentNsId), "ns="+str(newNsId))
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refNd[0].ns = newNsId
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refNd[0].toString()
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def reassignNamespaceId(self, currentNsId, newNsId):
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""" reassignNamespaceId
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Iterates over all nodes in this document, find those in namespace currentNsId and changes them to newNsId.
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returns: nothing
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"""
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log(self, "Migrating nodes /w ns index " + str(currentNsId) + " to " + str(newNsId), LOG_LEVEL_DEBUG)
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for nd in self.containedNodes:
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if nd[0].ns == currentNsId:
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# In our own document, update any references to this node
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for refNd in self.referencedNodes:
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if refNd[0].ns == currentNsId and refNd[0] == nd[0]:
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refNd[1].firstChild.data = refNd[1].firstChild.data.replace("ns="+str(currentNsId), "ns="+str(newNsId))
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refNd[0].ns = newNsId
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refNd[0].toString()
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nd[1].setAttribute(u'NodeId', nd[1].getAttribute(u'NodeId').replace("ns="+str(currentNsId), "ns="+str(newNsId)))
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nd[0].ns = newNsId
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nd[0].toString()
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class open62541_XMLPreprocessor:
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preProcDocuments = []
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def __init__(self):
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self.preProcDocuments = []
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def addDocument(self, documentPath):
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self.preProcDocuments.append(preProcessDocument(documentPath))
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def removePreprocessedFiles(self):
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for doc in self.preProcDocuments:
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doc.clean()
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def getPreProcessedFiles(self):
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files = []
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for doc in self.preProcDocuments:
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if (doc.parseOK):
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files.append(doc.getTargetXMLName())
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return files
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def testModelCongruencyAgainstReferences(self, doc, refs):
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""" testModelCongruencyAgainstReferences
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Counts how many of the nodes referencef in refs can be found in the model
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doc.
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returns: double corresponding to the percentage of hits
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"""
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sspace = len(refs)
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if sspace == 0:
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return float(0)
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found = 0
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for ref in refs:
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for n in doc.containedNodes:
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if str(ref) == str(n[0]):
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print ref, n[0]
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found = found + 1
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break
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return float(found)/float(sspace)
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def preprocess_assignUniqueNsIds(self):
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nsdep = []
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docLst = []
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# Search for namespace 0('s) - plural possible if user is overwriting NS0 defaults
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# Remove them from the list of namespaces, zero does not get demangled
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for doc in self.preProcDocuments:
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if doc.getNamespaceId() == 0:
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docLst.append(doc)
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for doc in docLst:
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self.preProcDocuments.remove(doc)
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# Reassign namespace id's to be in ascending order
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nsidx = 1 # next namespace id to assign on collision (first one will be "2")
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for doc in self.preProcDocuments:
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nsidx = nsidx + 1
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nsid = doc.getNamespaceId()
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doc.reassignNamespaceId(nsid, nsidx)
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docLst.append(doc)
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log(self, "Document " + doc.originXML + " is now namespace " + str(nsidx), LOG_LEVEL_INFO)
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self.preProcDocuments = docLst
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def getUsedNamespaceArrayNames(self):
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""" getUsedNamespaceArrayNames
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Returns the XML xmlns:s1 or <URI>[0] of each XML document (if contained/possible)
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returns: dict of int:nsId -> string:url
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"""
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nsName = {}
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for doc in self.preProcDocuments:
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uri = doc.getReferencedNamespaceUri(1)
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if uri == None:
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uri = "http://modeluri.not/retrievable/from/xml"
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nsName[doc.getNamespaceId()] = doc.getReferencedNamespaceUri(1)
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return nsName
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def preprocess_linkDependantModels(self):
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revertToStochastic = [] # (doc, int id), where id was not resolvable using model URIs
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# Attemp to identify the model relations by using model URIs in xmlns:sX or <URI> contents
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for doc in self.preProcDocuments:
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nsid = doc.getNamespaceId()
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dependencies = doc.getNamespaceDependencies()
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for d in dependencies:
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if d != nsid and d != 0:
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# Attempt to identify the namespace URI this d referes to...
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nsUri = doc.getReferencedNamespaceUri(d) # FIXME: This could actually fail and return ""!
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log(self, "Need a namespace referenced as " + str(d) + ". Which hopefully is " + nsUri, LOG_LEVEL_INFO)
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targetDoc = None
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for tgt in self.preProcDocuments:
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# That model, whose URI is known but its current id is not, will
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# refer have referred to itself as "1"
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if tgt.getReferencedNamespaceUri(1) == nsUri:
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targetDoc = tgt
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break
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if not targetDoc == None:
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# Found the model... relink the references
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doc.reassignReferencedNamespaceId(d, targetDoc.getNamespaceId())
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continue
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else:
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revertToStochastic.append((doc, d))
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log(self, "Failed to reliably identify which XML/Model " + os.path.basename(doc.originXML) + " calls ns=" +str(d), LOG_LEVEL_WARN)
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for (doc, d) in revertToStochastic:
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log(self, "Attempting to find stochastic match for target namespace ns=" + str(d) + " of " + os.path.basename(doc.originXML), LOG_LEVEL_WARN)
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# Copy all references to the given namespace
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refs = []
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matches = [] # list of (match%, targetDoc) to pick from later
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for ref in doc.referencedNodes:
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if ref[0].ns == d:
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refs.append(opcua_node_id_t(str(ref[0])))
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for tDoc in self.preProcDocuments:
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tDocId = tDoc.getNamespaceId()
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# Scenario: If these references did target this documents namespace...
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for r in refs:
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r.ns = tDocId
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r.toString()
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# ... how many of them would be found!?
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c = self.testModelCongruencyAgainstReferences(tDoc, refs)
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print c
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if c>0:
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matches.append(c, tDoc)
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best = (0, None)
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for m in matches:
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print m[0]
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if m[0] > best[0]:
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best = m
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if best[1] != None:
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log(self, "Best match (" + str(best[1]*100) + "%) for what " + os.path.basename(doc.originXML) + " refers to as ns="+str(d)+" was " + os.path.basename(best[1].originXML), LOG_LEVEL_WARN)
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doc.reassignReferencedNamespaceId(d, best[1].getNamespaceId())
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else:
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log(self, "Failed to find a match for what " + os.path.basename(doc.originXML) + " refers to as ns=" + str(d) ,LOG_LEVEL_ERROR )
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def preprocessAll(self):
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##
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## First: Gather statistics about the namespaces:
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for doc in self.preProcDocuments:
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doc.analyze()
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# Preprocess step: Remove XML specific Naming scheme ("uax:")
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# FIXME: Not implemented
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##
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## Preprocess step: Check namespace ID multiplicity and reassign IDs if necessary
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##
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self.preprocess_assignUniqueNsIds()
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self.preprocess_linkDependantModels()
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##
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## Prep step: prevent any XML from using namespace 1 (reserved for instances)
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## FIXME: Not implemented
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##
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## Final: Write modified XML tmp files
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for doc in self.preProcDocuments:
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doc.finalize()
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return True
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