275 lines
8.3 KiB
Python
275 lines
8.3 KiB
Python
# Nemubot is a smart and modulable IM bot.
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# Copyright (C) 2012-2015 Mercier Pierre-Olivier
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Affero General Public License for more details.
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#
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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from urllib.parse import urljoin, urlparse, urlsplit, urlunsplit
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import socket
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from nemubot.exception import IMException
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def isURL(url):
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"""Return True if the URL can be parsed"""
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o = urlparse(_getNormalizedURL(url))
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return o.netloc != "" and o.path != ""
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def _getNormalizedURL(url):
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"""Return a light normalized form for the given URL"""
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return url if "//" in url or ":" in url else "//" + url
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def getNormalizedURL(url):
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"""Return a normalized form for the given URL"""
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return urlunsplit(urlsplit(_getNormalizedURL(url), "http"))
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def getScheme(url):
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"""Return the protocol of a given URL"""
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o = urlparse(url, "http")
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return o.scheme
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def getHost(url):
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"""Return the domain of a given URL"""
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return urlparse(_getNormalizedURL(url), "http").hostname
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def getPort(url):
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"""Return the port of a given URL"""
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return urlparse(_getNormalizedURL(url), "http").port
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def getPath(url):
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"""Return the page request of a given URL"""
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return urlparse(_getNormalizedURL(url), "http").path
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def getUser(url):
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"""Return the page request of a given URL"""
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return urlparse(_getNormalizedURL(url), "http").username
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def getPassword(url):
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"""Return the page request of a given URL"""
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return urlparse(_getNormalizedURL(url), "http").password
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# Get real pages
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def _URLConn(cb, url, body=None, timeout=7, header=None, follow_redir=True):
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o = urlparse(_getNormalizedURL(url), "http")
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import http.client
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kwargs = {
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'host': o.hostname,
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'port': o.port,
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'timeout': timeout
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}
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if o.scheme == "http":
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conn = http.client.HTTPConnection(**kwargs)
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elif o.scheme == "https":
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# For Python>3.4, restore the Python 3.3 behavior
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import ssl
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if hasattr(ssl, "create_default_context"):
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kwargs["context"] = ssl.create_default_context()
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kwargs["context"].check_hostname = False
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kwargs["context"].verify_mode = ssl.CERT_NONE
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conn = http.client.HTTPSConnection(**kwargs)
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elif o.scheme is None or o.scheme == "":
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conn = http.client.HTTPConnection(**kwargs)
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else:
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raise IMException("Invalid URL")
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from nemubot import __version__
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if header is None:
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header = {"User-agent": "Nemubot v%s" % __version__}
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elif "User-agent" not in header:
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header["User-agent"] = "Nemubot v%s" % __version__
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if body is not None and "Content-Type" not in header:
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header["Content-Type"] = "application/x-www-form-urlencoded"
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import socket
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try:
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if o.query != '':
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conn.request("GET" if body is None else "POST",
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o.path + "?" + o.query,
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body,
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header)
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else:
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conn.request("GET" if body is None else "POST",
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o.path,
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body,
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header)
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except socket.timeout as e:
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raise IMException(e)
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except OSError as e:
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raise IMException(e.strerror)
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try:
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res = conn.getresponse()
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if follow_redir and ((res.status == http.client.FOUND or
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res.status == http.client.MOVED_PERMANENTLY) and
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res.getheader("Location") != url):
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return _URLConn(cb,
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url=urljoin(url, res.getheader("Location")),
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body=body,
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timeout=timeout,
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header=header,
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follow_redir=follow_redir)
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return cb(res)
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except http.client.BadStatusLine:
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raise IMException("Invalid HTTP response")
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finally:
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conn.close()
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def getURLHeaders(url, body=None, timeout=7, header=None, follow_redir=True):
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"""Return page headers corresponding to URL or None if any error occurs
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Arguments:
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url -- the URL to get
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body -- Data to send as POST content
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timeout -- maximum number of seconds to wait before returning an exception
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"""
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def next(res):
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return res.status, res.getheaders()
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return _URLConn(next, url=url, body=body, timeout=timeout, header=header, follow_redir=follow_redir)
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def getURLContent(url, body=None, timeout=7, header=None, decode_error=False,
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max_size=524288):
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"""Return page content corresponding to URL or None if any error occurs
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Arguments:
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url -- the URL to get
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body -- Data to send as POST content
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timeout -- maximum number of seconds to wait before returning an exception
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decode_error -- raise exception on non-200 pages or ignore it
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max_size -- maximal size allow for the content
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"""
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def _nextURLContent(res):
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size = int(res.getheader("Content-Length", 524288))
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cntype = res.getheader("Content-Type")
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if max_size >= 0 and (size > max_size or (cntype is not None and cntype[:4] != "text" and cntype[:4] != "appl")):
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raise IMException("Content too large to be retrieved")
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data = res.read(size)
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# Decode content
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charset = "utf-8"
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if cntype is not None:
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lcharset = res.getheader("Content-Type").split(";")
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if len(lcharset) > 1:
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for c in lcharset:
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ch = c.split("=")
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if ch[0].strip().lower() == "charset" and len(ch) > 1:
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cha = ch[1].split(".")
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if len(cha) > 1:
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charset = cha[1]
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else:
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charset = cha[0]
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import http.client
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if res.status == http.client.OK or res.status == http.client.SEE_OTHER:
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return data.decode(charset, errors='ignore').strip()
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elif decode_error:
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return data.decode(charset, errors='ignore').strip()
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else:
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raise IMException("A HTTP error occurs: %d - %s" %
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(res.status, http.client.responses[res.status]))
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return _URLConn(_nextURLContent, url=url, body=body, timeout=timeout, header=header)
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def getXML(*args, **kwargs):
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"""Get content page and return XML parsed content
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Arguments: same as getURLContent
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"""
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cnt = getURLContent(*args, **kwargs)
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if cnt is None:
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return None
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else:
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from xml.dom.minidom import parseString
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return parseString(cnt)
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def getJSON(*args, remove_callback=False, **kwargs):
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"""Get content page and return JSON content
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Arguments: same as getURLContent
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"""
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cnt = getURLContent(*args, **kwargs)
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if cnt is None:
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return None
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else:
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import json
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if remove_callback:
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import re
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cnt = re.sub(r"^[^(]+\((.*)\)$", r"\1", cnt)
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return json.loads(cnt)
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# Other utils
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def striphtml(data):
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"""Remove HTML tags from text
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Argument:
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data -- the string to strip
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"""
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if not isinstance(data, str) and not isinstance(data, bytes):
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return data
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try:
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from html import unescape
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except ImportError:
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def _replace_charref(s):
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s = s.group(1)
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if s[0] == '#':
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if s[1] in 'xX':
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return chr(int(s[2:], 16))
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else:
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return chr(int(s[2:]))
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else:
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from html.entities import name2codepoint
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return chr(name2codepoint[s])
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# unescape exists from Python 3.4
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def unescape(s):
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if '&' not in s:
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return s
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import re
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return re.sub('&([^;]+);', _replace_charref, s)
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import re
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return re.sub(r' +', ' ',
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unescape(re.sub(r'<.*?>', '', data)).replace('\n', ' '))
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