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FSPageTemplate.py

##############################################################################
#
# Copyright (c) 2001 Zope Corporation and Contributors. All Rights Reserved.
# 
# This software is subject to the provisions of the Zope Public License,
# Version 2.0 (ZPL).  A copy of the ZPL should accompany this distribution.
# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
# FOR A PARTICULAR PURPOSE
# 
##########################################################################
""" Customizable page templates that come from the filesystem.

$Id: FSPageTemplate.py,v 1.8.8.8 2003/09/01 16:09:22 tseaver Exp $
"""

from string import split, replace
from os import stat
import re, sys

import Globals, Acquisition
from DateTime import DateTime
from DocumentTemplate.DT_Util import html_quote
from Acquisition import aq_parent
from AccessControl import getSecurityManager, ClassSecurityInfo
from Shared.DC.Scripts.Script import Script
from Products.PageTemplates.PageTemplate import PageTemplate
from Products.PageTemplates.ZopePageTemplate import ZopePageTemplate, Src

from DirectoryView import registerFileExtension, registerMetaType, expandpath
from CMFCorePermissions import ViewManagementScreens, View, FTPAccess
from FSObject import FSObject
from utils import getToolByName

xml_detect_re = re.compile('^\s*<\?xml\s+')

class FSPageTemplate(FSObject, Script, PageTemplate):
    "Wrapper for Page Template"
     
    meta_type = 'Filesystem Page Template'

    _owner = None  # Unowned

    manage_options=(
        (
            {'label':'Customize', 'action':'manage_main'},
            {'label':'Test', 'action':'ZScriptHTML_tryForm'},
            )
        )

    security = ClassSecurityInfo()
    security.declareObjectProtected(View)

    security.declareProtected(ViewManagementScreens, 'manage_main')
    manage_main = Globals.DTMLFile('dtml/custpt', globals())

    # Declare security for unprotected PageTemplate methods.
    security.declarePrivate('pt_edit', 'write')

    def __init__(self, id, filepath, fullname=None, properties=None):
        FSObject.__init__(self, id, filepath, fullname, properties)
        self.ZBindings_edit(self._default_bindings)

    def _createZODBClone(self):
        """Create a ZODB (editable) equivalent of this object."""
        obj = ZopePageTemplate(self.getId(), self._text, self.content_type)
        obj.expand = 0
        obj.write(self.read())
        return obj

    def ZCacheable_isCachingEnabled(self):
        return 0

    def _readFile(self, reparse):
        fp = expandpath(self._filepath)
        file = open(fp, 'r')    # not 'rb', as this is a text file!
        try: 
            data = file.read()
        finally: 
            file.close()
        if reparse:
            if xml_detect_re.match(data):
                # Smells like xml
                self.content_type = 'text/xml'
            else:
                try:
                    del self.content_type
                except (AttributeError, KeyError):
                    pass
            self.write(data)

    security.declarePrivate('read')
    def read(self):
        # Tie in on an opportunity to auto-update
        self._updateFromFS()
        return FSPageTemplate.inheritedAttribute('read')(self)

    ### The following is mainly taken from ZopePageTemplate.py ###

    expand = 0

    func_defaults = None
    func_code = ZopePageTemplate.func_code
    _default_bindings = ZopePageTemplate._default_bindings

    security.declareProtected(View, '__call__')

    def pt_macros(self):
        # Tie in on an opportunity to auto-reload
        self._updateFromFS()
        return FSPageTemplate.inheritedAttribute('pt_macros')(self)

    def pt_render(self, source=0, extra_context={}):
        self._updateFromFS()  # Make sure the template has been loaded.
        try:
            if not source: # Hook up to caching policy.

                REQUEST = getattr( self, 'REQUEST', None )

                if REQUEST:

                    content = aq_parent( self )

                    mgr = getToolByName( content
                                       , 'caching_policy_manager'
                                       , None
                                       )

                    if mgr:
                        view_name = self.getId()
                        RESPONSE = REQUEST[ 'RESPONSE' ]
                        headers = mgr.getHTTPCachingHeaders( content
                                                           , view_name
                                                           , extra_context
                                                           )
                        for key, value in headers:
                            RESPONSE.setHeader( key, value )

            return FSPageTemplate.inheritedAttribute('pt_render')( self,
                    source, extra_context )

        except RuntimeError:
            if Globals.DevelopmentMode:
                err = FSPageTemplate.inheritedAttribute( 'pt_errors' )( self )
                if not err:
                    err = sys.exc_info()
                err_type = err[0]
                err_msg = '<pre>%s</pre>' % replace( str(err[1]), "\'", "'" )
                msg = 'FS Page Template %s has errors: %s.<br>%s' % (
                    self.id, err_type, html_quote(err_msg) )
                raise RuntimeError, msg
            else:
                raise
                
    security.declarePrivate( '_ZPT_exec' )
    _ZPT_exec = ZopePageTemplate._exec

    security.declarePrivate( '_exec' )
    def _exec(self, bound_names, args, kw):
        """Call a FSPageTemplate"""
        try:
            response = self.REQUEST.RESPONSE
        except AttributeError:
            response = None
        # Read file first to get a correct content_type default value.
        self._updateFromFS()
        # call "inherited"
        result = self._ZPT_exec( bound_names, args, kw )
        return result
 
    # Copy over more methods
    security.declareProtected(FTPAccess, 'manage_FTPget')
    security.declareProtected(View, 'get_size')
    security.declareProtected(ViewManagementScreens, 'PrincipiaSearchSource',
        'document_src')

    pt_getContext = ZopePageTemplate.pt_getContext
    ZScriptHTML_tryParams = ZopePageTemplate.ZScriptHTML_tryParams
    manage_FTPget = ZopePageTemplate.manage_FTPget
    get_size = ZopePageTemplate.get_size
    getSize = get_size
    PrincipiaSearchSource = ZopePageTemplate.PrincipiaSearchSource
    document_src = ZopePageTemplate.document_src


d = FSPageTemplate.__dict__
d['source.xml'] = d['source.html'] = Src()

Globals.InitializeClass(FSPageTemplate)

registerFileExtension('pt', FSPageTemplate)
registerFileExtension('html', FSPageTemplate)
registerFileExtension('htm', FSPageTemplate)
registerMetaType('Page Template', FSPageTemplate)


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