WizardTool.py 35.4 KB
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##############################################################################
#
# Copyright (c) 2006 Nexedi SARL and Contributors. All Rights Reserved.
#                    Romain Courteaud <romain@nexedi.com>
#                    Ivan Tyagov <ivan@nexedi.com>
#
# WARNING: This program as such is intended to be used by professional
# programmers who take the whole responsability of assessing all potential
# consequences resulting from its eventual inadequacies and bugs
# End users who are looking for a ready-to-use solution with commercial
# garantees and support are strongly adviced to contract a Free Software
# Service Company
#
# This program is Free Software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
#
##############################################################################

from AccessControl import ClassSecurityInfo
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from ZPublisher.HTTPRequest import FileUpload
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from Globals import InitializeClass, DTMLFile
from Products.ERP5Type.Tool.BaseTool import BaseTool
from Products.ERP5Type import Permissions
from Products.ERP5Wizard import _dtmldir
from Products.CMFCore.utils import getToolByName
from zLOG import LOG, INFO, WARNING, ERROR, DEBUG
from cStringIO import StringIO
from UserDict import UserDict
import xmlrpclib, socket, sys, traceback, urllib, urllib2, base64, cgi
from AccessControl.SecurityManagement import newSecurityManager, noSecurityManager
import zLOG
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import cookielib
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from urlparse import urlparse, urlunparse
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from base64 import encodestring, decodestring
from urllib import quote, unquote
from DateTime import DateTime
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from Products.PluggableAuthService.interfaces.plugins import IAuthenticationPlugin
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# global (RAM) cookie storage
cookiejar = cookielib.CookieJar()
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referer  = None
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installation_status = {'bt5': {'current': 0,
                               'all': 0,},
                       'activity_list': [],}
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# cookie name to store user's preferred language name
LANGUAGE_COOKIE_NAME = 'configurator_user_preferred_language'

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def _isUserAcknowledged(cookiejar):
  """ Is user authenticated to remote system through a cookie. """
  for cookie in cookiejar:
    if cookie.name == '__ac' and cookie.value != '':
      return 1
  return 0
  
def _getAcCookieFromServer(url, opener, cookiejar, username, password, header_dict = {}):
  """ get __ac cookie from server """
  data = urllib.urlencode({'__ac_name':  username,
                           '__ac_password':  password})
  request = urllib2.Request(url, data, header_dict)
  f = opener.open(request)
  return f

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def _setSuperSecurityManager(self):
  """ Change to super user account. """
  user = self.getWrappedOwner()
  newSecurityManager(self.REQUEST, user)

class GeneratorCall(UserDict):
  """ Class use to generate/interpret XML-RPC call for the wizard. """
  
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  _binary_keys = ("data", "filedata", "previous", "next",)
  _string_keys = ( "command", "server_buffer",)
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  def __init__(self, *args, **kw):
    UserDict.__init__(self, *args, **kw)
    self.convert_data = {}
    for key in (self._binary_keys + self._string_keys):
      self.setdefault(key, None)
      
  def load(self, xmlrpccall):
    """ Convert the xmlrpccall into the object. """
    self.convert_data = xmlrpclib.loads(xmlrpccall)[0][0]
    for binary_key in self._binary_keys:
      if self.convert_data[binary_key] is not None:
        if isinstance(self.convert_data[binary_key], list):
          self[binary_key] = []
          for item in self.convert_data[binary_key]:
            self[binary_key].append(self._decodeData(item[16:-18]))
        else:
          self[binary_key] = self._decodeData(self.convert_data[binary_key][16:-18])
    ## load string keys 
    for string_key in self._string_keys:
      self[string_key] = self.convert_data[string_key]

  def dump(self):
    """ Dump object to a xmlrpccall. """
    for binary_key in self._binary_keys:
      if isinstance(self[binary_key], list):
        ## we have list of values 
        self.convert_data[binary_key] = []
        for item in self[binary_key]:
          self.convert_data[binary_key].append(self._encodeData(item))
      else:
        if self[binary_key] is not None:
          self.convert_data[binary_key] = self._encodeData(self[binary_key])
        else:
          self.convert_data[binary_key] = None
    for string_key in self._string_keys:
      self.convert_data[string_key] = self[string_key]
    return xmlrpclib.dumps((self.convert_data,), 'GeneratorAnswer', allow_none=1)

  def _decodeData(self, data):
    """ Decode data. """
    binary_decoder = xmlrpclib.Binary()
    binary_decoder.decode(data)
    return binary_decoder.data
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  def _encodeData(self, data):
    """ Encode data to transmitable text. """
    fp = StringIO()
    try:
      xmlrpclib.Binary(data=data).encode(fp)
      return fp.getvalue()
    finally:
      fp.close()

def getPicklableRequest(REQUEST):
  """ Return 'pickable' request """
  picklable_request = {}
  for key, value in REQUEST.items():
    picklable_request[key] = str(value)
  return picklable_request

def _generateErrorXML(error_message):
  """ Generate HTML for displaying an error. """
  log_message = traceback.format_exc()
  return '<table><tr><td class="error">%s</td></tr></table>' % error_message
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## server to local preferences id translation table
_server_to_preference_ids_map = {'client_id': 'preferred_express_client_uid',
                                 'current_bc_index': 'preferred_express_erp5_uid',
                                 'password': 'preferred_express_password',
                                 'user_id': 'preferred_express_user_id',}


class WizardTool(BaseTool):
  """ WizardTool is able to generate custom business templates. """
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  id = 'portal_wizard'
  meta_type = 'ERP5 Wizard Tool'
  portal_type = 'Wizard Tool'
  isPortalContent = 1 
  isRADContent = 1
  property_sheets = ()
  security = ClassSecurityInfo()
  security.declareProtected(Permissions.ManagePortal, 'manage_overview')
  manage_overview = DTMLFile('explainWizardTool', _dtmldir )
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  # Stop traversing a concatenated path after the proxy method.
  def __before_publishing_traverse__(self, self2, request):
    path = request['TraversalRequestNameStack']
    if path and path[-1] == 'proxy':
      subpath = path[:-1]
      subpath.reverse()
      request.set('traverse_subpath', subpath)
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      # initialize our root proxy URL which we use for a referer
      global referer
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      path[:-1] = []
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      if referer is None:
        referer = '%s/portal_wizard/proxy/%s/view' %(self.getPortalObject().absolute_url(), \
                                                                                   '/'.join(subpath[:3]))      
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  def _getProxyURL(self, subpath='', query=''):
    # Helper method to construct an URL appropriate for proxying a request.
    # This makes sure that URLs generated by absolute_url at a remote site
    # will be always towards the proxy method again.
    # 
    # Note that the code assumes that VirtualHostBase is visible. The setting
    # of a front-end server must allow this.
    # 
    # This should generate an URL like this:
    # 
    # http://remotehost:9080/VirtualHostBase/http/localhost:8080/VirtualHostRoot/_vh_erp5/_vh_portal_wizard/_vh_proxy/erp5/person_module/2
    part_list = []

    server_url = self.getServerUrl().rstrip('/')
    part_list.append(server_url)

    part_list.append('VirtualHostBase')

    portal_url = self.getPortalObject().absolute_url()
    scheme, rest = urllib.splittype(portal_url)
    addr, path = urllib.splithost(rest)
    host, port = urllib.splitnport(addr, scheme == 'http' and 80 or 443)
    part_list.append(scheme)
    part_list.append('%s:%s' % (host, port))

    part_list.append('VirtualHostRoot')

    method_path = self.absolute_url_path() + '/proxy'
    part_list.extend(('_vh_' + p for p in method_path.split('/') if p))

    server_root = self.getServerRoot().strip('/')

    if isinstance(subpath, (list, tuple)):
      subpath = '/'.join(subpath)

    if not subpath.startswith(server_root):
      part_list.append(server_root)

    part_list.append(subpath)

    url = '/'.join((p for p in part_list if p))
    if query:
      url = url + '?' + query
    return url

  def _getSubsribedUserAndPassword(self):
    """Retrieve the username and password for the subscription from
    the system."""
    user = self.getExpressConfigurationPreference('preferred_express_user_id', '')
    pw =  self.getExpressConfigurationPreference('preferred_express_password', '')
    return (user, pw)

  # This is a custom opener director for not handling redirections
  # and errors automatically. This is necessary because the proxy
  # should pass all results to a client as they are.
  simple_opener_director = urllib2.OpenerDirector()
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  for name in ('ProxyHandler', 'UnknownHandler', \
               'HTTPHandler', 'FTPHandler', 
               'FileHandler', 'HTTPSHandler',):
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    handler = getattr(urllib2, name, None)
    if handler is not None:
      simple_opener_director.add_handler(handler())
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  # add cookie support
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  simple_opener_director.add_handler(urllib2.HTTPCookieProcessor(cookiejar))
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  security.declareProtected(Permissions.View, 'proxy')
  def proxy(self, **kw):
    """Proxy a request to a server."""
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    global cookiejar, referer
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    if self.REQUEST['REQUEST_METHOD'] != 'GET':
      # XXX this depends on the internal of HTTPRequest.
      pos = self.REQUEST.stdin.tell()
      self.REQUEST.stdin.seek(0)
      # XXX if filesize is too big, this might cause a problem.
      data = self.REQUEST.stdin.read()
      self.REQUEST.stdin.seek(pos)
    else:
      data = None

    content_type = self.REQUEST.get_header('content-type')
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    # XXX if ":method" trick is used, then remove it from subpath.
    if self.REQUEST.traverse_subpath:
      if data is not None:
        user_input = data
      else:
        user_input = self.REQUEST.QUERY_STRING
      if user_input:
        mark = ':method'
        content_type_value = None
        content_type_dict = None
        if content_type:
          content_type_value, content_type_dict = cgi.parse_header(content_type)
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        if content_type_value == 'multipart/form-data':
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          fp = StringIO(user_input)
          user_input_dict = cgi.parse_multipart(fp, content_type_dict)
        else:
          user_input_dict = cgi.parse_qs(user_input)

        for i in user_input_dict:
          if i.endswith(mark):
            method_name = i[:-len(mark)]
            method_path = method_name.split('/')
            if self.REQUEST.traverse_subpath[-len(method_path):]==method_path:
              del self.REQUEST.traverse_subpath[-len(method_path):]
              break

    url = self._getProxyURL(self.REQUEST.traverse_subpath,
                            self.REQUEST['QUERY_STRING'])

    # XXX this will send the password unconditionally!
    # I hope https will be good enough.
    header_dict = {}
    user_and_password = self._getSubsribedUserAndPassword()
    if (len(user_and_password)==2 and
        user_and_password[0] and user_and_password[1]):
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      # try login to server only once using cookie method
      if not _isUserAcknowledged(cookiejar):
        server_url = self.getServerUrl()
        f = _getAcCookieFromServer('%s/WebSite_login' %server_url,
                                   self.simple_opener_director,
                                   cookiejar,
                                   user_and_password[0],
                                   user_and_password[1])
        # if server doesn't support cookie authentication try basic authentication
        if not _isUserAcknowledged(cookiejar):
          auth = 'Basic %s' % base64.standard_b64encode('%s:%s' % user_and_password)
          header_dict['Authorization'] = auth
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    if content_type:
      header_dict['Content-Type'] = content_type

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    # send locally saved cookies to remote web server
    if not header_dict.has_key('Cookie'):
      header_dict['Cookie'] = ''
    for cookie in cookiejar:
      # unconditionally send all cookies (no matter if expired or not) as URL is always the same
      header_dict['Cookie']  +=  '%s=%s;' %(cookie.name, cookie.value)
    # XXX: include cookies from local browser (like show/hide tabs) which are set directly
    # by client JavaScript code (i.e. not sent from server)
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    # add HTTP referer (especially useful in Localizer when changing language)
    header_dict['REFERER'] = self.REQUEST.get('HTTP_REFERER', None) or referer
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    request = urllib2.Request(url, data, header_dict)
    f = self.simple_opener_director.open(request)

    try:
      data = f.read()
      metadata = f.info()
      response = self.REQUEST.RESPONSE
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      if f.code> 300 and f.code <400:
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        # adjust return url which my contain proxy URLs as arguments
        location = metadata.getheader('location')
        parsed_url = list(urlparse(location))
        local_site_url_prefix = urllib.quote('%s/portal_wizard/proxy' \
                                              %self.getPortalObject().absolute_url())
        remote_url_parsed = urlparse(self.getServerUrl())
        remote_site_url_prefix = '%s://%s/kb' %(remote_url_parsed[0], remote_url_parsed[1])
        # fix arguments for returned location URL
        parsed_url[4] = parsed_url[4].replace(local_site_url_prefix, remote_site_url_prefix)
        response['location'] = urlunparse(parsed_url)

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      response.setStatus(f.code, f.msg)
      response.setHeader('content-type', metadata.getheader('content-type'))
      # FIXME this list should be confirmed with the RFC 2616.
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      for k in ('uri', 'cache-control', 'last-modified',
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                'etag', 'if-matched', 'if-none-match',
                'if-range', 'content-language', 'content-range'
                'content-location', 'content-md5', 'expires',
                'content-encoding', 'vary', 'pragma', 'content-disposition',
                'content-length', 'age'):
        if k in metadata:
          response.setHeader(k, metadata.getheader(k))
      return data
    finally:
      f.close()

  def _getRemoteWitchTool(self, server_url):
    """ Return remote generator tool interface. """
    server = xmlrpclib.ServerProxy(server_url, allow_none=1)
    witch_tool = server.portal_witch
    return witch_tool

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  def callRemoteProxyMethod(self, distant_method, server_url=None):
    """ Call proxy method on server. """
    # set real method_id
    form = self.REQUEST.form
    form['method_id'] = distant_method
    return self._callRemoteMethod('proxyMethodHandler', wrap_result=0)

  def _callRemoteMethod(self, distant_method, server_url=None, wrap_result=1):
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    """ Call remote method on server and get result. """
    result_call = GeneratorCall()
    if server_url is None:
      # calculate it
      server_url = self.getServerUrl() + self.getServerRoot()
    witch_tool = self._getRemoteWitchTool(server_url)
    parameter_dict = self.REQUEST.form
    ## add client arguments
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    self._updateParameterDictWithServerInfo(parameter_dict)
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    ## handle file upload
    self._updateParameterDictWithFileUpload(parameter_dict)
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    ## call remote method 
    try:
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      method = getattr(witch_tool, distant_method)
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      html = method(parameter_dict)
    except socket.error, message:
      html = _generateErrorXML("""Cannot contact the server: %s.
                                  Please check your network settings."""  %server_url)
      zLOG.LOG('Wizard Tool socket error', zLOG.ERROR, message)
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      result_call.update({"command": "show",
                          "data": html,
                          "next": None,
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                          "previous": None})
    except xmlrpclib.ProtocolError, message:
      html = _generateErrorXML("""The server %s refused to reply.
                                  Please contact erp5-dev@erp5.org""" % server_url)
      zLOG.LOG('Wizard Tool xmlrpc protocol error', zLOG.ERROR, message)
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      result_call.update({"command": "show",
                          "data": html,
                          "next": None,
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                          "previous": None})
    except xmlrpclib.Fault, message:
      html = _generateErrorXML("Error/bug inside the server: %s." % server_url)
      zLOG.LOG('Wizard Tool xmlrpc fault', zLOG.ERROR, message)
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      result_call.update({"command": "show",
                          "data": html,
                          "next": None,
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                          "previous": None})
    else:
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      if not wrap_result:
        # simply return raw result
        return html
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      result_call.load(html)
      command = result_call["command"]
      html = result_call["data"]
    return result_call

  def _setServerInfo(self, **kw):
    """ Save to local Zope client address info. """
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    global _server_to_preference_ids_map
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    for item, value in kw.items():
      if item in _server_to_preference_ids_map.keys():
        ## save persistently (as preference)
        self.setExpressConfigurationPreference(_server_to_preference_ids_map[item],
                                               value)
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  def _updateParameterDictWithServerInfo(self, parameter_dict):
    """Updates parameter_dict to include local saved server info settings. """
    global _server_to_preference_ids_map
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    for key, value in _server_to_preference_ids_map.items():
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      parameter_dict[key] = self.getExpressConfigurationPreference(value, None)
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    ## add local ERP5 instance url
    parameter_dict['erp5_url'] = self.getPortalObject().absolute_url()
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    # add user preffered language
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    REQUEST = getattr(self, 'REQUEST', None)
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    configurator_user_preferred_language = 'en'
    if REQUEST is not None:
      # language value will be in cookie or REQUEST itself.
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      configurator_user_preferred_language = REQUEST.get(LANGUAGE_COOKIE_NAME, configurator_user_preferred_language)
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    parameter_dict['user_preferred_language'] = configurator_user_preferred_language

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  def _updateParameterDictWithFileUpload(self, parameter_dict):
    """Updates parameter_dict to replace file upload with their file content,
    encoded as XML-RPC Binary
    """
    for key, value in parameter_dict.items():
      if isinstance(value, FileUpload):
        pos = value.tell()
        value.seek(0)
        parameter_dict[key] = xmlrpclib.Binary(value.read())
        value.seek(pos)

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  def _importBT5FileData(self, bt5_filename, bt5_filedata):
    """ Import bt5 file content. """
    bt5_io = StringIO(bt5_filedata)
    portal_templates =  getToolByName(self.getPortalObject(), 'portal_templates')
    try:
      business_template = portal_templates.importFile(import_file=bt5_io, batch_mode=1)
    except:
      ## importing of generated bt5 failed
      business_template = None
      LOG("Wizard", ERROR, "[FAIL] Import of Nexedi Configurator bt5 file(%s)" %bt5_filename)
      raise
    bt5_io.close()
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    #install bt5
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    portal_workflow =  getToolByName(self.getPortalObject(), 'portal_workflow')
    business_template.install()
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  security.declareProtected(Permissions.ModifyPortalContent,
                            'installBT5FilesFromServer')
  def installBT5FilesFromServer(self,
                                server_response,
                                execute_after_setup_script=True,
                                install_standard_bt5=True,
                                install_customer_bt5=True,
                                use_super_manager=True):
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    """ Install or update BT5 files which we get from remote server. """
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    global installation_status
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    if use_super_manager:
      # set current security manager to owner of site
      _setSuperSecurityManager(self.getPortalObject())
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    portal = self.getPortalObject()
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    bt5_files = server_response.get("filedata", [])
    bt5_filenames = server_response["server_buffer"].get("filenames", [])
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    portal_templates = getToolByName(portal, 'portal_templates')
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    counter = 0
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    LOG("Wizard", INFO,
        "Starting installation for %s" %' '.join(bt5_filenames))
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    installation_status['bt5']['all'] = len(bt5_files)
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    #execute_after_setup_script = install_standard_bt5 =  install_customer_bt5 = False # dev mode
    for bt5_id in bt5_filenames:
      if bt5_id.startswith('http://'):
        ## direct download of bt5 files available
        if install_standard_bt5:
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          bt  = portal_templates.download(bt5_id)
          bt.install()
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          installation_status['bt5']['current'] = counter + 1
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          LOG("Wizard", INFO,
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              "[OK] standard bt5 installation (HTTP) from %s" %bt5_id)
      else:
        ## remote system supplied file content
        if install_customer_bt5:
          bt5_filedata = bt5_files[counter]
          self._importBT5FileData(bt5_id, bt5_filedata)
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          installation_status['bt5']['current'] = counter + 1
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          LOG("Wizard", INFO,
              "[OK] customized bt5 installation (XML-RPC) %s, %s bytes" %
               (bt5_id, len(bt5_filedata)))
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      ## ..
      counter += 1
    ## can we execute after setup script that will finish installation on client side?
    bt5_after_setup_script_id = server_response["server_buffer"].get("after_setup_script_id", None)
    if bt5_after_setup_script_id is None and \
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        self.getExpressConfigurationPreference(
                           'preferred_express_configuration_status', False):
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      ## we already have stored after setup script id
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      bt5_after_setup_script_id = self.getExpressConfigurationPreference(
                           'preferred_express_after_setup_script_id', None)
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    if execute_after_setup_script and bt5_after_setup_script_id is not None:
      ## Execute script provided (if) in customer specific business template.
      bt5_customer_template_id = server_response["server_buffer"]['filenames'][-1]
      bt5_customer_template_id = bt5_customer_template_id.replace('.bt5', '')
      after_script = getattr(self, bt5_after_setup_script_id, None)
      if after_script is not None:
        after_script_result = after_script(customer_template_id = bt5_customer_template_id)
        LOG("Wizard", INFO,"[OK] execution of afer setup script %s (for bt5 %s)\n%s"
             %(after_script.getId(), bt5_customer_template_id, after_script_result))
    ## mark this ERP5 instance as configured
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    self.setExpressConfigurationPreference(
        'preferred_express_configuration_status', 1)
    self.setExpressConfigurationPreference(
        'preferred_express_after_setup_script_id', bt5_after_setup_script_id)
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    # Make sure that the site status is reloaded.
    portal.portal_caches.clearAllCache()
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    LOG("Wizard", INFO,
              "Completed installation for %s" %' '.join(bt5_filenames))
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    if use_super_manager:
      noSecurityManager()
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  ######################################################
  ##               Navigation                         ##
  ######################################################
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  #security.declareProtected(Permissions.ModifyPortalContent, 'login')
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  def remoteLogin(self, REQUEST):
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    """ Login client and show next form. """
    client_id = None
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    user_id = REQUEST.get('field_my_ac_name', None) or self.getExpressConfigurationPreference('preferred_express_user_id')
    REQUEST.form['field_my_ac_name'] =  user_id    
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    password = REQUEST.get('field_my_ac_password', '')
    came_from_method = REQUEST.get('field_my_came_from_method', '')
    ## call remote server
    response = self._callRemoteMethod("getIdentification")
    command = response["command"]
    if command == "show":
      ## server wants some more info - i.e possible 
      ## selection of working business configuration
      if response.get('server_buffer', None) is not None:
        client_id = response['server_buffer'].get('client_id', None)
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      self._setServerInfo(user_id=user_id,
                          password=password,
                          client_id=client_id)
      return self.WizardTool_dialogForm(form_html=response["data"])
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    elif command == "next":
      self._setServerInfo(user_id=user_id, \
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                          #password=password, \
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                          client_id=response['server_buffer'].get('client_id', None), \
                          current_bc_index=response['server_buffer'].get('current_bc_index', None))
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      # set encoded __ac_express cookie at client's browser
      __ac_express = quote(encodestring(password))
      expires = (DateTime() + 1).toZone('GMT').rfc822()
      REQUEST.RESPONSE.setCookie('__ac_express',
                                 __ac_express,
                                 expires = expires)
      REQUEST.set('__ac_express', __ac_express)
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      return self.next(REQUEST=REQUEST)
    elif command == "login":
      ## invalid user/password
      self.REQUEST.RESPONSE.redirect( \
          'portal_wizard/%s?field_my_ac_name=%s&portal_status_message=%s' \
            %(came_from_method, user_id, response['server_buffer']['message']))
      return 
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  def login(self, REQUEST):
    """ Login client and show next form. """
    user_id = self.getExpressConfigurationPreference('preferred_express_user_id')
    password = REQUEST.get('field_my_ac_password', '')
    if self._isCorrectConfigurationKey(user_id, password):
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      # set user preferred configuration language
      user_preferred_language = REQUEST.get('field_my_user_preferred_language', None)
      if user_preferred_language:
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        # Set language value to request so that next page after login
        # can get the value. Because cookie value is available from
        # next request.
        REQUEST.set(LANGUAGE_COOKIE_NAME, user_preferred_language)
        REQUEST.RESPONSE.setCookie(LANGUAGE_COOKIE_NAME,
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                                   user_preferred_language,
                                   expires=(DateTime()+30).rfc822())
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      # set encoded __ac_express cookie at client's browser
      __ac_express = quote(encodestring(password))
      expires = (DateTime() + 1).toZone('GMT').rfc822()
      REQUEST.RESPONSE.setCookie('__ac_express',
                                 __ac_express,
                                 expires = expires)
      REQUEST.set('__ac_express', __ac_express)
      return self.next(REQUEST=REQUEST)
    else:
      # incorrect user_id / password
      REQUEST.set('portal_status_message', self.Base_translateString('Incorrect Configuration Key'))
      return self.view()

  def _isCorrectConfigurationKey(self, user_id, password):
    """ Is configuration key correct """
    uf = self.getPortalObject().acl_users
    for plugin_name, plugin in uf._getOb('plugins').listPlugins(IAuthenticationPlugin):
      if plugin.authenticateCredentials({'login':user_id, 
                                                       'password': password}) is not None:
        return 1
    return 0

  def _isUserAllowedAccess(self):
    """ Can user access locally portal_wizard """
    password = self.REQUEST.get('__ac_express', None)
    if password is not None: 
      user_id = self.getExpressConfigurationPreference('preferred_express_user_id')
      password = decodestring(unquote(password))
      return self._isCorrectConfigurationKey(user_id, password)
    return 0

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  #security.declareProtected(Permissions.ModifyPortalContent, 'next')
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  def next(self, REQUEST):
    """ Validate settings and return a new form to the user.  """
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    # check if user is allowed to access service
    if not self._isUserAllowedAccess():
      REQUEST.set('portal_status_message', self.Base_translateString('Incorrect Configuration Key'))
      return self.view()
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    response = self._callRemoteMethod("next")
    if isinstance(response['server_buffer'], dict):
      ## Remote server may request us to save some data.
      self._setServerInfo(**response['server_buffer'])
    ## Parse server response
    command = response["command"]
    html = response["data"]
    if command == "show":
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      return self.WizardTool_dialogForm(previous=response['previous'],
                                        form_html=html,
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                                        next = response['next'])
    elif command == "update":
      return self.next(REQUEST=REQUEST)
    elif command == "login":
      REQUEST.set('portal_status_message', html)
      return self.view(REQUEST=REQUEST)
    elif command == "install":
      return self.startInstallation(REQUEST=REQUEST)
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  #security.declareProtected(Permissions.ModifyPortalContent, 'previous')
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  def previous(self, REQUEST):
    """ Display the previous form. """
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    # check if user is allowed to access service
    if not self._isUserAllowedAccess():
      REQUEST.set('portal_status_message', self.Base_translateString('Incorrect Configuration Key'))
      return self.view()
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    response = self._callRemoteMethod('previous')
    command = response["command"]
    html = response['data']
    if command == "show":
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      return self.WizardTool_dialogForm(previous=response['previous'],
                                        form_html=html,
                                        next=response['next'])
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    elif command == "login":
      REQUEST.set('portal_status_message', html)
      return self.view(REQUEST=REQUEST)
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  security.declarePublic(Permissions.AccessContentsInformation,
                         'getInstallationStatusReportFromClient')
  def getInstallationStatusReportFromClient(self,
                          active_process_id=None, REQUEST=None):
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    """ Query local ERP5 instance for installation status.
        If installation is over the installation activities and reindexing
        activities should not exists.
    """
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    global installation_status
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    portal_activities = getToolByName(self.getPortalObject(), 'portal_activities')
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    is_bt5_installation_over = (portal_activities.countMessageWithTag('initialERP5Setup')==0)
    if 0 == len(portal_activities.getMessageList()) and is_bt5_installation_over:
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      html = self.callRemoteProxyMethod('WizardTool_successfulConfiguration')
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    else:
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      if is_bt5_installation_over:
        # only if bt5s are installed start tracking number of activities
        activity_list = portal_activities.getMessageList()
        installation_status['activity_list'].append(len(activity_list))
      html = self.WizardTool_viewRunningInstallationMessage(installation_status = installation_status)
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    return html
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  security.declarePublic(Permissions.AccessContentsInformation, 'getInstallationStatusReportFromServer')
  def getInstallationStatusReportFromServer(self, active_process_id=None, REQUEST=None):
    """ Query remote server (usually only once for some installation status report """
    response = self._callRemoteMethod("getInstallationStatusReport")
    html = response["data"]
    return html
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  security.declareProtected(Permissions.ModifyPortalContent, 'startInstallation')
  def startInstallation(self, REQUEST):
    """ Start installation process as an activity which will query generation server and
       download/install bt5 template files and meanwhile offer user a nice GUI to observe 
       what's happening. """
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    global installation_status
    # init installation status
    installation_status['bt5']['all'] = 0
    installation_status['bt5']['current'] = 0
    installation_status['activity_list'] = []
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    active_process = self.portal_activities.newActiveProcess()
    REQUEST.set('active_process_id', active_process.getId())
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    request_restore_dict = {'__ac_express': self.REQUEST.get('__ac_express', None),}
    self.activate(active_process=active_process, tag = 'initialERP5Setup').initialERP5Setup(request_restore_dict)
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    return self.Wizard_viewInstallationStatus(REQUEST)

  security.declareProtected(Permissions.ModifyPortalContent, 'initialERP5Setup')
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  def initialERP5Setup(self,  request_restore_dict={}):
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    """ Get from remote generation server customized bt5 template files 
        and then install them. """
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    # restore some REQUEST variables as this method is executed in an activity
    # and there's no access to real original REQUEST
    for key, value in request_restore_dict.items():
      self.REQUEST.set(key, value)
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    self.REQUEST.form['wizard_request_type'] = 'initial_setup'
    # calculate server_url, because after bt5 installation reindexing is started
    # which will make it impossible to get preferences items    
    server_url = self.getServerUrl() + self.getServerRoot()
    server_response = self._callRemoteMethod('getBT5FilesForBusinessConfiguration', server_url)
    ## save erp5_uid which will make it possible to distingush different business conf for client
    current_bc_index = server_response['server_buffer']['current_bc_index']
    self._setServerInfo(current_bc_index = current_bc_index)
    self.installBT5FilesFromServer(server_response, True)
    server_response = self._callRemoteMethod('finalizeInstallation', server_url)
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    LOG("Wizard", INFO,
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        "Successfuly installed generated business configuration from %s" %self.getServerUrl())

  security.declareProtected(Permissions.ModifyPortalContent, 'repair')
  def repair(self):
    """ Repair broken ERP5 instance. This will install all business templates 
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    for ERP5 instance as specified in its business configuration. """
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    self.REQUEST.form['wizard_request_type'] = 'repair'
    server_response = self._callRemoteMethod('getBT5FilesForBusinessConfiguration')
    if server_response['command'] == "install":
      active_process = self.portal_activities.newActiveProcess()
      self.activate(active_process=active_process).installBT5FilesFromServer(server_response, True)
    html = server_response['data']
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    LOG("Wizard", INFO,
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        "Start repair process for ERP5 instance from %s" %self.getServerUrl())
    return self.WizardTool_dialogForm(form_html = html)

  security.declareProtected(Permissions.ModifyPortalContent, 'update')
  def update(self):
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    """ Update ERP5's instance standard business templates. """
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    self.REQUEST.form['wizard_request_type'] = 'update'
    server_response = self._callRemoteMethod('getBT5FilesForBusinessConfiguration')
    if server_response['command'] == "install":
      active_process = self.portal_activities.newActiveProcess()
      self.activate(active_process=active_process).installBT5FilesFromServer(server_response,
                                                                             execute_after_setup_script = False)
    html = server_response['data']
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    LOG("Wizard", INFO,
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        "Start update process for ERP5 instance from %s" %self.getServerUrl())
    return self.WizardTool_dialogForm(form_html = html)

  security.declareProtected(Permissions.View, 'getServerUrl')
  def getServerUrl(self):
    return self.getExpressConfigurationPreference('preferred_witch_tool_server_url', '')

  security.declareProtected(Permissions.View, 'getServerRoot')
  def getServerRoot(self):
    return self.getExpressConfigurationPreference('preferred_witch_tool_server_root', '')
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  security.declareProtected(Permissions.View, 'getExpressConfigurationPreference')
  def getExpressConfigurationPreference(self, preference_id, default = None):
    """ Get Express configuration preference """
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    _setSuperSecurityManager(self.getPortalObject())
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    portal_preferences = getToolByName(self, 'portal_preferences')
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    preference_value = portal_preferences.getPreference(preference_id, default)
    noSecurityManager()
    return preference_value
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  security.declareProtected(Permissions.ModifyPortalContent, 'setExpressConfigurationPreference')
  def setExpressConfigurationPreference(self, preference_id, value):
    """ Set Express configuration preference """
    portal_preferences = getToolByName(self, 'portal_preferences')
    if portal_preferences.getActivePreference() is not None:
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      portal_preferences.setPreference(preference_id, value)