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w3c_validator.py
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Tue, Nov 12, 05:48

w3c_validator.py
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# This file is part of Invenio.
# Copyright (C) 2007, 2008, 2010, 2011 CERN.
#
# Invenio 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.
#
# Invenio 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 Invenio; if not, write to the Free Software Foundation, Inc.,
# 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
"""
Exports just one function w3c_validate which validate a text against the W3C validator
"""
__revision__ = "$Id$"
import httplib
import mimetypes
import re
import time
from xml.sax.saxutils import unescape
from invenio.config import CFG_CERN_SITE
if CFG_CERN_SITE:
# A host mirroring W3C validator
CFG_W3C_VALIDATOR_HOST = 'pcuds12.cern.ch'
# The selector for checking the page
CFG_W3C_VALIDATOR_SELECTOR = '/w3c-markup-validator/check'
# Whethever to sleep for 1s for kindness to the server
CFG_W3C_VALIDATOR_SLEEP_P = False
else:
CFG_W3C_VALIDATOR_HOST = 'validator.w3.org'
CFG_W3C_VALIDATOR_SELECTOR = '/check'
CFG_W3C_VALIDATOR_SLEEP_P = True
# Whethever we automatically exploit regression tests for validating pages.
CFG_TESTS_REQUIRE_HTML_VALIDATION = False
def w3c_validate(text, host=CFG_W3C_VALIDATOR_HOST,
selector=CFG_W3C_VALIDATOR_SELECTOR,
sleep_p=CFG_W3C_VALIDATOR_SLEEP_P):
""" Validate the text against W3C validator like host, with a given selector
and eventually sleeping for a second.
Return a triple, with True if the document validate as the first element.
If False, then the second and third elements contain respectively a list of
errors and of warnings of the form: (line number, column, error, row involved).
"""
if sleep_p:
time.sleep(1)
h = _post_multipart(host, selector, \
[('output', 'soap12')], [('uploaded_file', 'foobar.html', text)])
errcode, errmsg, headers = h.getreply()
if 'X-W3C-Validator-Status' in headers:
if headers['X-W3C-Validator-Status'] == 'Valid':
return (True, [], [])
else:
errors, warnings = _parse_validator_soap(h.file.read(), text.split('\n'))
return (False, errors, warnings)
else:
return (False, [], [])
def w3c_errors_to_str(errors, warnings):
""" Pretty print errors and warnings coming from w3c_validate """
ret = ''
if errors:
ret += '%s errors:\n' % len(errors)
for line, col, msg, text in errors:
ret += '%s (%s:%s):\n' % (unescape(msg, {'"': "'"}), line, col)
ret += text + '\n'
ret += ' '*(int(col)-1) + '^\n'
ret += '---\n'
if warnings:
ret += '%s warnings:\n' % len(warnings)
for line, col, msg, text in warnings:
ret += '%s (%s:%s):\n' % (unescape(msg, {'"': "'"}), line, col)
ret += text + '\n'
ret += ' '*(int(col)-1) + '^\n'
ret += '---\n'
return ret
def w3c_validate_p(text, host=CFG_W3C_VALIDATOR_HOST,
selector=CFG_W3C_VALIDATOR_SELECTOR,
sleep_p=CFG_W3C_VALIDATOR_SLEEP_P):
""" Validate the text against W3C validator like host, with a given selector
and eventually sleeping for a second.
Return a True if the document validate.
"""
if sleep_p:
time.sleep(1)
h = _post_multipart(host, selector, \
[('output', 'soap12')], [('uploaded_file', 'foobar.html', text)])
errcode, errmsg, headers = h.getreply()
if 'X-W3C-Validator-Status' in headers:
return headers['X-W3C-Validator-Status'] == 'Valid'
return False
_errors_re = re.compile(r'<m:errors>.*<m:errorcount>(?P<errorcount>[\d]+)\</m:errorcount>.*<m:errorlist>(?P<errors>.*)</m:errorlist>.*</m:errors>', re.M | re.S)
_warnings_re = re.compile(r'<m:warnings>.*<m:warningcount>(?P<warningcount>[\d]+)</m:warningcount>.*<m:warninglist>(?P<warnings>.*)</m:warninglist>.*</m:warnings>', re.M | re.S)
_error_re = re.compile(r'<m:error>.*<m:line>(?P<line>[\d]+)</m:line>.*<m:col>(?P<col>[\d]+)</m:col>.*<m:message>(?P<message>.+)</m:message>.*</m:error>', re.M | re.S)
_warning_re = re.compile(r'<m:warning>.*<m:line>(?P<line>[\d]+)</m:line>.*<m:col>(?P<col>[\d]+)</m:col>.*<m:message>(?P<message>.+)</m:message>.*</m:warning>', re.M | re.S)
def _parse_validator_soap(soap_output, rows):
""" Given the soap output provided by W3C validator it returns a tuple
containing the list of errors in the form (line, col, error_msg) and
the list of warnings in the same form.
"""
errors = _errors_re.search(soap_output)
warnings = _warnings_re.search(soap_output)
if errors:
errors = _error_re.findall(errors.group('errors'))
errors = map(lambda error: (error[0], error[1], error[2], rows[int(error[0])-1]), errors)
else:
errors = []
if warnings:
warnings = _warning_re.findall(warnings.group('warnings'))
warnings = map(lambda warning: (warning[0], warning[1], warning[2], rows[int(warning[0])-1]), warnings)
else:
warnings = []
return (errors, warnings)
def _post_multipart(host, selector, fields, files):
"""
Post fields and files to an http host as multipart/form-data.
fields is a sequence of (name, value) elements for regular form fields.
files is a sequence of (name, filename, value) elements for data to be uploaded as files
Return the server's responses.
"""
content_type, body = _encode_multipart_formdata(fields, files)
h = httplib.HTTP(host)
h.putrequest('POST', selector)
h.putheader('content-type', content_type)
h.putheader('content-length', str(len(body)))
h.endheaders()
h.send(body)
return h
def _encode_multipart_formdata(fields, files):
"""
fields is a sequence of (name, value) elements for regular form fields.
files is a sequence of (name, filename, value) elements for data to be uploaded as files
Return (content_type, body) ready for httplib.HTTP instance
"""
BOUNDARY = '----------ThIs_Is_tHe_bouNdaRY_$'
CRLF = '\r\n'
L = []
for (key, value) in fields:
L.append('--' + BOUNDARY)
L.append('Content-Disposition: form-data; name="%s"' % key)
L.append('')
L.append(value)
for (key, filename, value) in files:
L.append('--' + BOUNDARY)
L.append('Content-Disposition: form-data; name="%s"; filename="%s"' % (key, filename))
L.append('Content-Type: %s' % _get_content_type(filename))
L.append('')
L.append(value)
L.append('--' + BOUNDARY + '--')
L.append('')
body = CRLF.join(L)
content_type = 'multipart/form-data; boundary=%s' % BOUNDARY
return content_type, body
def _get_content_type(filename):
return mimetypes.guess_type(filename)[0] or 'application/octet-stream'

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