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##############################################################################
#
# Copyright (c) 2001, 2002 Zope Foundation and Contributors.
# All Rights Reserved.
#
# This software is subject to the provisions of the Zope Public License,
# Version 2.1 (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.
#
##############################################################################
"""Filesystem Page Template module
Zope object encapsulating a Page Template from the filesystem.
"""
__all__ = ("PageTemplateFile",)
import os
import sys
import re
import logging
from zope.pagetemplate.pagetemplate import PageTemplate
logger = logging.getLogger(__name__)
DEFAULT_ENCODING = "utf-8"
meta_pattern = re.compile(
br'\s*<meta\s+http-equiv=["\']?Content-Type["\']?'
br'\s+content=["\']?([^;]+);\s*charset=([^"\']+)["\']?\s*/?\s*>\s*',
re.IGNORECASE)
def package_home(gdict):
filename = gdict["__file__"]
return os.path.dirname(filename)
class PageTemplateFile(PageTemplate):
"Zope wrapper for filesystem Page Template using TAL, TALES, and METAL"
_v_last_read = 0
_v_debug = __debug__
def __init__(self, filename, _prefix=None):
path = self.get_path_from_prefix(_prefix)
self.filename = os.path.join(path, filename)
if not os.path.isfile(self.filename):
raise ValueError("No such file", self.filename)
def get_path_from_prefix(self, _prefix):
if isinstance(_prefix, str):
path = _prefix
else:
if _prefix is None:
_prefix = sys._getframe(2).f_globals
path = package_home(_prefix)
return path
def _prepare_html(self, text):
match = meta_pattern.search(text)
if match is not None:
type_, encoding = (x.decode('utf-8') for x in match.groups())
# TODO: Shouldn't <meta>/<?xml?> stripping
# be in PageTemplate.__call__()?
text = meta_pattern.sub(b"", text)
else:
type_ = None
encoding = DEFAULT_ENCODING
text = text.decode(encoding)
return text, type_
def _read_file(self):
__traceback_info__ = self.filename
with open(self.filename, "rb") as f:
text = f.read(XML_PREFIX_MAX_LENGTH)
type_ = sniff_type(text)
text += f.read()
if type_ != "text/xml":
text, type_ = self._prepare_html(text)
return text, type_
def _cook_check(self):
if self._v_last_read and not self._v_debug:
return
__traceback_info__ = self.filename
try:
mtime = os.path.getmtime(self.filename)
except OSError:
mtime = 0
if self._v_program is not None and mtime == self._v_last_read:
return
text, type_ = self._read_file()
self.pt_edit(text, type_)
assert self._v_cooked
if self._v_errors:
logger.error('PageTemplateFile: Error in template %s: %s',
self.filename, '\n'.join(self._v_errors))
return
self._v_last_read = mtime
def pt_source_file(self):
return self.filename
def __getstate__(self):
raise TypeError("non-picklable object")
XML_PREFIXES = [
b"<?xml", # ascii, utf-8
b"\xef\xbb\xbf<?xml", # utf-8 w/ byte order mark
b"\0<\0?\0x\0m\0l", # utf-16 big endian
b"<\0?\0x\0m\0l\0", # utf-16 little endian
b"\xfe\xff\0<\0?\0x\0m\0l", # utf-16 big endian w/ byte order mark
b"\xff\xfe<\0?\0x\0m\0l\0", # utf-16 little endian w/ byte order mark
]
XML_PREFIX_MAX_LENGTH = max(map(len, XML_PREFIXES))
def sniff_type(text):
"""Return 'text/xml' if text appears to be XML, otherwise return None."""
for prefix in XML_PREFIXES:
if text.startswith(prefix):
return "text/xml"
return None
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