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# Copyright 2012-2017 Facundo Batista
#
# This program is free software: you can redistribute it and/or modify it
# under the terms of the GNU General Public License version 3, as published
# by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranties of
# MERCHANTABILITY, SATISFACTORY QUALITY, 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/>.
#
# For further info, check https://launchpad.net/encuentro
"""A couple of helpers for server stuff."""
import bz2
import pickle
import cgi
import json
import os
import re
import time
from urllib import parse
from urllib.error import HTTPError
UNIQUE_ID_SEPARATOR = '--'
def save_file(basename, data):
"""Save file to disk, dumping the data."""
# encode and compress
info = json.dumps(data)
info = bz2.compress(info.encode('ascii'))
# dump it
tmpname = basename + ".tmp"
bz2name = basename + ".bz2"
with open(tmpname, "wb") as fh:
fh.write(info)
os.rename(tmpname, bz2name)
def _weird_utf8_fixing(byteseq):
"""Clean non-utf8 elements and decode.
Receive bytes, return unicode.
"""
tmp = []
consume = 0
for i, c in enumerate(byteseq):
if consume:
consume -= 1
continue
if c <= 127: # 0... ....
tmp.append(c)
elif 192 <= c <= 223: # 110. ....
n = byteseq[i + 1]
if 128 <= n <= 191:
# second byte ok
tmp.append(c)
tmp.append(n)
consume = 1
else:
ValueError("Unsupported fixing sequence.")
result = bytes(tmp).decode("utf8")
return result
def sanitize(html):
"""Sanitize html."""
# try to decode in utf8, otherwise try in cp1252
try:
html = html.decode("utf8")
except UnicodeDecodeError:
try:
html = html.decode("cp1252")
except UnicodeDecodeError:
html = _weird_utf8_fixing(html)
# remove script stuff
html = re.sub("<script.*?</script>", "", html, flags=re.S)
return html
class Cache(object):
"""An automatic caché in disk."""
def __init__(self, fname):
self.fname = fname
if os.path.exists(fname):
with open(fname, "rb") as fh:
self.db = pickle.load(fh)
else:
self.db = {}
def get(self, key):
"""Return a value in the DB."""
return self.db[key]
def set(self, key, value):
"""Set a value to the DB."""
self.db[key] = value
temp = self.fname + ".tmp"
with open(temp, "wb") as fh:
pickle.dump(self.db, fh)
os.rename(temp, self.fname)
def retryable(logger):
"""Decorator generator."""
def decorator(func):
"""Decorator to retry functions."""
def _f(*args, **kwargs):
"""Retryable function."""
for attempt in range(5, -1, -1): # if reaches 0: no more attempts
try:
res = func(*args, **kwargs)
except Exception as e:
if isinstance(e, HTTPError) and e.code // 100 == 4:
raise
if not attempt:
raise
logger.debug(" problem (retrying...): %s", e)
time.sleep(30)
else:
return res
return _f
return decorator
def get_url_param(url, param):
"""Get the value of the param in the url."""
return cgi.parse_qs(parse.urlparse(url).query)[param][0]
def clean_html(text):
"""Clean HTML structures from the text."""
text = re.sub("<.*?>", "", text)
text = text.replace(" ", "")
return text.strip()
def enhance_number(text):
"""Enhance the number of a title, if any."""
# check "cap" version first
m = re.match("Cap. *(\d+)(.*)", text)
if m:
number, rest = m.groups()
number = int(number)
if rest:
text = "%02d. %s" % (number, rest.strip())
else:
text = "Capítulo %02d" % (number,)
return text
parts = text.split("-", 1)
if len(parts) != 2:
return text
maybe_number, rest = parts
try:
number = int(maybe_number)
except ValueError:
return text
text = "%02d. %s" % (number, rest.strip())
return text
def get_unique_id(prev_id, all_ids):
"""Fake an ID using a separator and a number for it to be unique."""
if UNIQUE_ID_SEPARATOR in prev_id:
p1, p2 = prev_id.split(UNIQUE_ID_SEPARATOR)
base_id = p1
prev_number = int(p2)
else:
prev_number = 0
base_id = prev_id
while prev_id in all_ids:
prev_number += 1
prev_id = base_id + UNIQUE_ID_SEPARATOR + str(prev_number)
return prev_id
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