#!/usr/bin/python

# Copyright (c) 2007-2016 Mozilla Foundation
#
# Permission is hereby granted, free of charge, to any person obtaining a
# copy of this software and associated documentation files (the "Software"),
# to deal in the Software without restriction, including without limitation
# the rights to use, copy, modify, merge, publish, distribute, sublicense,
# and/or sell copies of the Software, and to permit persons to whom the
# Software is furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
# THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
# DEALINGS IN THE SOFTWARE.

import httplib
import os
import sys
import re
import urlparse
import string
import gzip
import StringIO

extPat = re.compile(r'^.*\.([A-Za-z]+)$')
extDict = {
    "html": "text/html",
    "htm": "text/html",
    "xhtml": "application/xhtml+xml",
    "xht": "application/xhtml+xml",
    "xml": "application/xml",
}

argv = sys.argv[1:]

forceXml = 0
forceHtml = 0
gnu = 0
errorsOnly = 0
encoding = None
fileName = None
contentType = None
inputHandle = None
service = 'http://html5.validator.nu/'

for arg in argv:
    if '--help' == arg:
        print '-h : force text/html'
        print '-x : force application/xhtml+xml'
        print '-g : GNU output'
        print '-e : errors only (no info or warnings)'
        print '--encoding=foo : declare encoding foo'
        print '--service=url  : the address of the HTML5 validator'
        print 'One file argument allowed. Leave out to read from stdin.'
        sys.exit(0)
    elif arg.startswith("--encoding="):
        encoding = arg[11:]
    elif arg.startswith("--service="):
        service = arg[10:]
    elif arg.startswith("--"):
        sys.stderr.write('Unknown argument %s.\n' % arg)
        sys.exit(2)
    elif arg.startswith("-"):
        for c in arg[1:]:
            if 'x' == c:
                forceXml = 1
            elif 'h' == c:
                forceHtml = 1
            elif 'g' == c:
                gnu = 1
            elif 'e' == c:
                errorsOnly = 1
            else:
                sys.stderr.write('Unknown argument %s.\n' % arg)
                sys.exit(3)
    else:
        if fileName:
            sys.stderr.write('Cannot have more than one input file.\n')
            sys.exit(1)
        fileName = arg

if forceXml and forceHtml:
    sys.stderr.write('Cannot force HTML and XHTML at the same time.\n')
    sys.exit(2)

if forceXml:
    contentType = 'application/xhtml+xml'
elif forceHtml:
    contentType = 'text/html'
elif fileName:
    m = extPat.match(fileName)
    if m:
        ext = m.group(1)
        ext = ext.translate(string.maketrans(string.ascii_uppercase, string.ascii_lowercase))
        if extDict.has_key(ext):
            contentType = extDict[ext]
        else:
            sys.stderr.write('Unable to guess Content-Type from file name. Please force the type.\n')
            sys.exit(3)
    else:
        sys.stderr.write('Could not extract a filename extension. Please force the type.\n')
        sys.exit(6)
else:
    sys.stderr.write('Need to force HTML or XHTML when reading from stdin.\n')
    sys.exit(4)

if encoding:
    contentType = '%s; charset=%s' % (contentType, encoding)

if fileName:
    inputHandle = open(fileName, "rb")
else:
    inputHandle = sys.stdin

data = inputHandle.read()

buf = StringIO.StringIO()
gzipper = gzip.GzipFile(fileobj=buf, mode='wb')
gzipper.write(data)
gzipper.close()
gzippeddata = buf.getvalue()
buf.close()

connection = None
response = None
status = 302
redirectCount = 0

url = service
if gnu:
    url = url + '?out=gnu'
else:
    url = url + '?out=text'

if errorsOnly:
    url = url + '&level=error'

while (status == 302 or status == 301 or status == 307) and redirectCount < 10:
    if redirectCount > 0:
        url = response.getheader('Location')
    parsed = urlparse.urlsplit(url)
    if parsed[0] != 'http':
        sys.stderr.write('URI scheme %s not supported.\n' % parsed[0])
        sys.exit(7)
    if redirectCount > 0:
        connection.close()  # previous connection
        print 'Redirecting to %s' % url
        print 'Please press enter to continue or type "stop" followed by enter to stop.'
        if raw_input() != "":
            sys.exit(0)
    connection = httplib.HTTPConnection(parsed[1])
    connection.connect()
    connection.putrequest("POST", "%s?%s" % (parsed[2], parsed[3]), skip_accept_encoding=1)
    connection.putheader("User-Agent", 'html5check.py/2008-02-12')
    connection.putheader("Accept-Encoding", 'gzip')
    connection.putheader("Content-Type", contentType)
    connection.putheader("Content-Encoding", 'gzip')
    connection.putheader("Content-Length", len(gzippeddata))
    connection.endheaders()
    connection.send(gzippeddata)
    response = connection.getresponse()
    status = response.status
    redirectCount += 1

if status != 200:
    sys.stderr.write('%s %s\n' % (status, response.reason))
    sys.exit(5)

if response.getheader('Content-Encoding', 'identity').lower() == 'gzip':
    response = gzip.GzipFile(fileobj=StringIO.StringIO(response.read()))

if fileName and gnu:
    quotedName = '"%s"' % fileName.replace('"', '\\042')
    for line in response.read().split('\n'):
        if line:
            sys.stdout.write(quotedName)
            sys.stdout.write(line + '\n')
else:
    sys.stdout.write(response.read())

connection.close()