pyexec.py

OpenWFE是一个开放源码的Java工作流引擎。它是一个完整的业务处理管理套件：一个引擎

#
# Copyright (c) 2005, John Mettraux, OpenWFE.org
# All rights reserved.
# 
# Redistribution and use in source and binary forms, with or without 
# modification, are permitted provided that the following conditions are met:
# 
# . Redistributions of source code must retain the above copyright notice, this
#   list of conditions and the following disclaimer.  
# 
# . Redistributions in binary form must reproduce the above copyright notice, 
#   this list of conditions and the following disclaimer in the documentation 
#   and/or other materials provided with the distribution.
# 
# . Neither the name of the "OpenWFE" nor the names of its contributors may be
#   used to endorse or promote products derived from this software without
#   specific prior written permission.
# 
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
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# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
# POSSIBILITY OF SUCH DAMAGE.
#
# $Id: pyexec.py 1931 2005-07-07 07:39:47Z jmettraux $
#

"""

    PyExec is an OpenWFE component that listens on a port for incoming
    workitems, locates their '__python_code__' field and executes the
    contained string.

    PyExec is dangerous, malicious workitems could contain unwanted 
    code to be executed...

    $Id: pyexec.py 1931 2005-07-07 07:39:47Z jmettraux $

"""


from sys import exc_info
from openwfe.socket import SocketListener
from openwfe.socket import SocketDispatcher
from openwfe.socket import WorkitemConsumer
from openwfe.engine import definitions
from openwfe.engine.participant import lookupParticipantMap


#ENGINE_HOST = 'engineHost'
#ENGINE_PORT = 'enginePort'
REMOVE_FIELD = 'removeField'
CODE_FIELD_NAME = 'codeFieldName'


class PyExecConsumer (WorkitemConsumer):

    engineHost = 'localhost'
    enginePort = 7007
    removeField = 0
    codeFieldName = '__python_code__'


    def init (self, name, applicationContext, params):
        WorkitemConsumer.init(self, name, applicationContext, params)

        if params.has_key(CODE_FIELD_NAME):
            self.codeFieldName = params[CODE_FIELD_NAME]
        self.linfo("codeFieldName is set to '%s'" % self.codeFieldName)

        #if params.has_key(ENGINE_HOST):
        #    self.engineHost = params[ENGINE_HOST]
        #self.linfo("engine host is set to '%s'" % self.engineHost)

        #if params.has_key(ENGINE_PORT):
        #    self.enginePort = int(params[ENGINE_PORT])
        #self.linfo("engine port is set to %i" % self.enginePort)

        sRemove = params.get(REMOVE_FIELD)
        if (sRemove != None): 
            self.removeField = ("true" == sRemove.lower())
        self.linfo("removeField is set to %i" % self.removeField)


    def use (self, workitem):

        aCode = workitem.getAttribute(self.codeFieldName)

        if aCode != None:
            code = str(aCode.value)
            self.ldebug("got >>>\n%s\n<<< to execute" % code)

            try:
                exec(code)
            except Exception:
                #(eClass, eObject, eTrace) = exc_info()
                print exc_info()

            if self.removeField:
                workitem.removeAttribute(self.codeFieldName)

        pmap = lookupParticipantMap(self.applicationContext)
        sd = pmap.get(workitem.lastExpressionId.engineId)
        sd.dispatch(workitem)

        #sd = SocketDispatcher();
        #params = { 'host': self.engineHost, 'port': self.enginePort }
        #sd.init('%s::SocketDispatcher::%s:%i' % (self.__class__, self.engineHost, self.enginePort), self.applicationContext, params)
        #sd.dispatch(workitem)