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# gLifestream Copyright (C) 2009, 2010, 2015 Wojciech Polak
#
# 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 3 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, see <http://www.gnu.org/licenses/>.
import re
from django.utils import six
from django.utils.six.moves.urllib.parse import quote, unquote, urlsplit, urlunsplit
from django.utils.encoding import force_str, force_text
from django.utils.functional import allow_lazy
from django.utils.safestring import mark_safe, SafeData
try:
from bs4 import BeautifulSoup
except ImportError:
BeautifulSoup = None
def strip_script(s):
try:
if BeautifulSoup:
soup = BeautifulSoup(s)
to_extract = soup.findAll('script')
for item in to_extract:
item.extract()
s = str(soup)
except:
pass
return s
def bytes_to_human(bytes, precision=2):
suffixes = ('B', 'kB', 'MB', 'GB')
format = '%.*f %s'
size = float(bytes)
for suffix in suffixes:
if size >= 1024:
size /= 1024
else:
if suffix is suffixes[0]:
precision = 0
return format % (precision, size, suffix)
return format % (precision, size, suffixes[-1])
def strip_entities(value):
"""Returns the given HTML with all entities (&something;) stripped."""
return re.sub(r'&(?:\w+|#\d+);', '', force_text(value))
strip_entities = allow_lazy(strip_entities, six.text_type)
##
## Code taken from Django 1.7
##
TRAILING_PUNCTUATION = ['.', ',', ':', ';', '.)', '"', '\'']
WRAPPING_PUNCTUATION = [('(', ')'), ('<', '>'), ('[', ']'), ('<', '>'), ('"', '"'), ('\'', '\'')]
word_split_re = re.compile(r'(\s+)')
simple_url_re = re.compile(r'^https?://\[?\w', re.IGNORECASE)
simple_url_2_re = re.compile(r'^www\.|^(?!http)\w[^@]+\.(com|edu|gov|int|mil|net|org)$', re.IGNORECASE)
simple_email_re = re.compile(r'^\S+@\S+\.\S+$')
def smart_urlquote(url):
"Quotes a URL if it isn't already quoted."
# Handle IDN before quoting.
try:
scheme, netloc, path, query, fragment = urlsplit(url)
try:
netloc = netloc.encode('idna').decode('ascii') # IDN -> ACE
except UnicodeError: # invalid domain part
pass
else:
url = urlunsplit((scheme, netloc, path, query, fragment))
except ValueError:
# invalid IPv6 URL (normally square brackets in hostname part).
pass
url = unquote(force_str(url))
url = quote(url, safe=b'!*\'();:@&=+$,/?#[]~')
return force_text(url)
def urlize(text, trim_url_limit=None, nofollow=False, autoescape=False):
"""
Converts any URLs in text into clickable links.
Works on http://, https://, www. links, and also on links ending in one of
the original seven gTLDs (.com, .edu, .gov, .int, .mil, .net, and .org).
Links can have trailing punctuation (periods, commas, close-parens) and
leading punctuation (opening parens) and it'll still do the right thing.
If trim_url_limit is not None, the URLs in the link text longer than this
limit will be truncated to trim_url_limit-3 characters and appended with
an ellipsis.
If nofollow is True, the links will get a rel="nofollow" attribute.
If autoescape is True, the link text and URLs will be autoescaped.
"""
def trim_url(x, limit=trim_url_limit):
if limit is None or len(x) <= limit:
return x
return '%s...' % x[:max(0, limit - 3)]
safe_input = isinstance(text, SafeData)
words = word_split_re.split(force_text(text))
for i, word in enumerate(words):
if '.' in word or '@' in word or ':' in word:
# Deal with punctuation.
lead, middle, trail = '', word, ''
for punctuation in TRAILING_PUNCTUATION:
if middle.endswith(punctuation):
middle = middle[:-len(punctuation)]
trail = punctuation + trail
for opening, closing in WRAPPING_PUNCTUATION:
if middle.startswith(opening):
middle = middle[len(opening):]
lead = lead + opening
# Keep parentheses at the end only if they're balanced.
if (middle.endswith(closing)
and middle.count(closing) == middle.count(opening) + 1):
middle = middle[:-len(closing)]
trail = closing + trail
# Make URL we want to point to.
url = None
nofollow_attr = ' rel="nofollow"' if nofollow else ''
if simple_url_re.match(middle):
url = smart_urlquote(middle)
elif simple_url_2_re.match(middle):
url = smart_urlquote('http://%s' % middle)
elif ':' not in middle and simple_email_re.match(middle):
local, domain = middle.rsplit('@', 1)
try:
domain = domain.encode('idna').decode('ascii')
except UnicodeError:
continue
url = 'mailto:%s@%s' % (local, domain)
nofollow_attr = ''
# Make link.
if url:
trimmed = trim_url(middle)
if autoescape and not safe_input:
lead, trail = escape(lead), escape(trail)
url, trimmed = escape(url), escape(trimmed)
middle = '<a href="%s"%s>%s</a>' % (url, nofollow_attr, trimmed)
words[i] = mark_safe('%s%s%s' % (lead, middle, trail))
else:
if safe_input:
words[i] = mark_safe(word)
elif autoescape:
words[i] = escape(word)
elif safe_input:
words[i] = mark_safe(word)
elif autoescape:
words[i] = escape(word)
return ''.join(words)
urlize = allow_lazy(urlize, six.text_type)
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