source: TI07-MOLES/trunk/StubB/XSLT/browse/portal/cgi/browseCGI.py @ 764

#!/usr/bin/env python
# CGI Script to support prototype NDG MOLES_Portal (Browse) functionality
# Bryan Lawrence, April, 2006


import cgi
import os

xalanCLASSPATH='wherever'

def insecureGetDoc(uri):
        ''' Use Kevin's code to get the document from exist '''
        return ''

def doXSLT (document,xsltMethod):
        ''' Handle a possibly external transformation to produce an html page '''
        return '<p> One day a document</p>'

def EvaluateCredentials(ac,securityMetadata):
        ''' Take Moles security metadata and compare with attribute certificate '''
        return 1

class BrowseSession:
        ''' Holds the browse history and contact details for the NDG session manager '''
        def __init__(self,cookie):
                '''Instantiate and get security environment'''
                self.cookie=cookie
                self.history=[]
        def addToHistory(self,uri):
                ''' Add a URI to the session history'''
                self.history.append(uri)
        def getCredentials(self):
                '''Obtain the attribute certificate from the wallet '''
                pass

class StubB:
        ''' Holds the stub-b document and provides methods which get and manipulate it '''
        
        def __init__(self,uri,xsltMethod='JavaXalan'):
                '''Instantiate by getting URI from exist database'''
                try:
                        self.xml=insecureGetDoc(uri)
                except:
                        raise 'NotFound'
                self.xsltMethod=xsltMethod
        
        def getSecurityDetails(self):
                '''Obtain the roles and attribute authority address'''
                #issue an xquery on the stub-b
                #parse for roles
                #parse for AA WSDL
                roles=[]
                AAaddress=''
                return roles, AAaddress
        
        def toHTML(self):
                return doXSLT(self.xml,self.xsltMethod)
                
class CGIcontroller:
        ''' Currently holds the cgi environment and controls '''
        
        def __init__(self):
                ''' Instantiate the CGI environment'''
                self.env=os.environ
                self.path=self.env.get('PATH_INFO','/')
                self.FieldStorage=cgi.FieldStorage()

        def goforit(self):
                ''' This method actually responds to the user'''
                
                #Instantiate the Session Environment
                self.cookie=self.env.get('HTTP_COOKIE',None)

                self.session=BrowseSession(self.cookie)
                
                #Handle authorisation
                self.ac=self.session.getCredentials()
        
                #the uri may not be the whole path, but this will do for the moment
                self.uri=self.path
                try:
                        self.b=StubB(self.uri)
                except 'NotFound':
                        return self.error('NotFound')
                        
                if EvaluateCredentials(self.ac,self.uri):
                        #we can show the user the page
                        return self.b.toHTML()
                else:
                        return self.error('Not Allowed')
                
        def error(self,message):
                ''' Construct a nice formal response with appropriate HTML headers '''
                return 'error'