265 lines
10 KiB
Python
265 lines
10 KiB
Python
# -*- coding: utf-8 -*-
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#
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# Copyright (C) 2009 Andrew Resch <andrewresch@gmail.com>
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#
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# This file is part of Deluge and is licensed under GNU General Public License 3.0, or later, with
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# the additional special exception to link portions of this program with the OpenSSL library.
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# See LICENSE for more details.
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#
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import logging
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import os.path
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import zlib
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from urlparse import urljoin
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from twisted.internet import reactor
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from twisted.python.failure import Failure
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from twisted.web import client, http
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from twisted.web.error import PageRedirect
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from deluge.common import get_version
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log = logging.getLogger(__name__)
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class HTTPDownloader(client.HTTPDownloader):
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"""
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Factory class for downloading files and keeping track of progress.
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"""
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def __init__(self, url, filename, part_callback=None, headers=None,
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force_filename=False, allow_compression=True):
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"""
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:param url: the url to download from
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:type url: string
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:param filename: the filename to save the file as
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:type filename: string
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:param force_filename: forces use of the supplied filename, regardless of header content
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:type force_filename: bool
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:param part_callback: a function to be called when a part of data
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is received, it's signature should be: func(data, current_length, total_length)
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:type part_callback: function
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:param headers: any optional headers to send
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:type headers: dictionary
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"""
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self.part_callback = part_callback
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self.current_length = 0
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self.total_length = 0
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self.decoder = None
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self.value = filename
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self.force_filename = force_filename
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self.allow_compression = allow_compression
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self.code = None
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agent = "Deluge/%s (http://deluge-torrent.org)" % get_version()
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client.HTTPDownloader.__init__(self, url, filename, headers=headers, agent=agent)
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def gotStatus(self, version, status, message): # NOQA
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self.code = int(status)
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client.HTTPDownloader.gotStatus(self, version, status, message)
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def gotHeaders(self, headers): # NOQA
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if self.code == http.OK:
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if "content-length" in headers:
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self.total_length = int(headers["content-length"][0])
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else:
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self.total_length = 0
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if self.allow_compression and "content-encoding" in headers and \
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headers["content-encoding"][0] in ("gzip", "x-gzip", "deflate"):
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# Adding 32 to the wbits enables gzip & zlib decoding (with automatic header detection)
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# Adding 16 just enables gzip decoding (no zlib)
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self.decoder = zlib.decompressobj(zlib.MAX_WBITS + 32)
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if "content-disposition" in headers and not self.force_filename:
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new_file_name = str(headers["content-disposition"][0]).split(";")[1].split("=")[1]
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new_file_name = sanitise_filename(new_file_name)
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new_file_name = os.path.join(os.path.split(self.value)[0], new_file_name)
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count = 1
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fileroot = os.path.splitext(new_file_name)[0]
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fileext = os.path.splitext(new_file_name)[1]
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while os.path.isfile(new_file_name):
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# Increment filename if already exists
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new_file_name = "%s-%s%s" % (fileroot, count, fileext)
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count += 1
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self.fileName = new_file_name
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self.value = new_file_name
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elif self.code in (http.MOVED_PERMANENTLY, http.FOUND, http.SEE_OTHER, http.TEMPORARY_REDIRECT):
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location = headers["location"][0]
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error = PageRedirect(self.code, location=location)
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self.noPage(Failure(error))
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return client.HTTPDownloader.gotHeaders(self, headers)
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def pagePart(self, data): # NOQA
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if self.code == http.OK:
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self.current_length += len(data)
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if self.decoder:
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data = self.decoder.decompress(data)
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if self.part_callback:
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self.part_callback(data, self.current_length, self.total_length)
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return client.HTTPDownloader.pagePart(self, data)
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def pageEnd(self): # NOQA
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if self.decoder:
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data = self.decoder.flush()
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self.current_length -= len(data)
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self.decoder = None
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self.pagePart(data)
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return client.HTTPDownloader.pageEnd(self)
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def sanitise_filename(filename):
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"""
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Sanitises a filename to use as a download destination file.
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Logs any filenames that could be considered malicious.
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:param filename: the filename to sanitise
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:type filename: string
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:returns: the sanitised filename
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:rtype: string
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"""
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# Remove any quotes
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filename = filename.strip("'\"")
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if os.path.basename(filename) != filename:
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# Dodgy server, log it
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log.warning("Potentially malicious server: trying to write to file '%s'", filename)
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# Only use the basename
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filename = os.path.basename(filename)
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filename = filename.strip()
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if filename.startswith(".") or ";" in filename or "|" in filename:
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# Dodgy server, log it
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log.warning("Potentially malicious server: trying to write to file '%s'", filename)
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return filename
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def _download_file(url, filename, callback=None, headers=None, force_filename=False, allow_compression=True):
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"""
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Downloads a file from a specific URL and returns a Deferred. A callback
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function can be specified to be called as parts are received.
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Args:
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url (str): The url to download from
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filename (str): The filename to save the file as
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callback (func): A function to be called when a part of data is received,
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it's signature should be: func(data, current_length, total_length)
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headers (dict): Any optional headers to send
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force_filename (bool): force us to use the filename specified rather than
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one the server may suggest
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allow_compression (bool): Allows gzip & deflate decoding
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Returns:
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Deferred: the filename of the downloaded file
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Raises:
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t.w.e.PageRedirect
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t.w.e.Error: for all other HTTP response errors
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"""
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url = str(url)
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filename = str(filename)
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if headers:
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for key, value in headers.items():
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headers[str(key)] = str(value)
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if allow_compression:
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if not headers:
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headers = {}
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headers["accept-encoding"] = "deflate, gzip, x-gzip"
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# In Twisted 13.1.0 _parse() function replaced by _URI class.
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# In Twisted 15.0.0 _URI class renamed to URI.
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if hasattr(client, "_parse"):
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scheme, host, port, dummy_path = client._parse(url)
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else:
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try:
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from twisted.web.client import _URI as URI
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except ImportError:
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from twisted.web.client import URI
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uri = URI.fromBytes(url)
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scheme = uri.scheme
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host = uri.host
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port = uri.port
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factory = HTTPDownloader(url, filename, callback, headers, force_filename, allow_compression)
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if scheme == "https":
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from twisted.internet import ssl
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# ClientTLSOptions in Twisted >= 14, see ticket #2765 for details on this addition.
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try:
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from twisted.internet._sslverify import ClientTLSOptions
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except ImportError:
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ctx_factory = ssl.ClientContextFactory()
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else:
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class TLSSNIContextFactory(ssl.ClientContextFactory): # pylint: disable=no-init
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"""
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A custom context factory to add a server name for TLS connections.
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"""
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def getContext(self): # NOQA
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ctx = ssl.ClientContextFactory.getContext(self)
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ClientTLSOptions(host, ctx)
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return ctx
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ctx_factory = TLSSNIContextFactory()
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reactor.connectSSL(host, port, factory, ctx_factory)
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else:
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reactor.connectTCP(host, port, factory)
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return factory.deferred
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def download_file(url, filename, callback=None, headers=None, force_filename=False,
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allow_compression=True, handle_redirects=True):
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"""
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Downloads a file from a specific URL and returns a Deferred. A callback
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function can be specified to be called as parts are received.
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Args:
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url (str): The url to download from
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filename (str): The filename to save the file as
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callback (func): A function to be called when a part of data is received,
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it's signature should be: func(data, current_length, total_length)
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headers (dict): Any optional headers to send
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force_filename (bool): force us to use the filename specified rather than
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one the server may suggest
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allow_compression (bool): Allows gzip & deflate decoding
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handle_redirects (bool): If HTTP redirects should be handled automatically
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Returns:
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Deferred: the filename of the downloaded file
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Raises:
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t.w.e.PageRedirect: Unless handle_redirects=True
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t.w.e.Error: for all other HTTP response errors
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"""
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def on_download_success(result):
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log.debug("Download success!")
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return result
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def on_download_fail(failure):
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if failure.check(PageRedirect) and handle_redirects:
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new_url = urljoin(url, failure.getErrorMessage().split(" to ")[1])
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result = _download_file(new_url, filename, callback=callback, headers=headers,
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force_filename=force_filename,
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allow_compression=allow_compression)
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result.addCallbacks(on_download_success, on_download_fail)
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else:
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# Log the failure and pass to the caller
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log.warning("Error occurred downloading file from '%s': %s",
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url, failure.getErrorMessage())
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result = failure
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return result
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d = _download_file(url, filename, callback=callback, headers=headers,
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force_filename=force_filename, allow_compression=allow_compression)
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d.addCallbacks(on_download_success, on_download_fail)
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return d
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