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# wikiget - CLI tool for downloading files from Wikimedia sites
# Copyright (C) 2018-2021 Cody Logan and contributors
# SPDX-License-Identifier: GPL-3.0-or-later
#
# Wikiget 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.
#
# Wikiget 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 Wikiget. If not, see <https://www.gnu.org/licenses/>.
import logging
import os
import sys
from urllib.parse import unquote, urlparse
from mwclient import APIError, InvalidResponse, LoginError, Site
from requests import ConnectionError, HTTPError
from tqdm import tqdm
import wikiget
from wikiget.validations import valid_file, verify_hash
def download(dl, args):
url = urlparse(dl)
if url.netloc:
filename = url.path
site_name = url.netloc
if args.site is not wikiget.DEFAULT_SITE:
# this will work even if the user specifies 'commons.wikimedia.org'
logging.warning("target is a URL, ignoring site specified with --site")
else:
filename = dl
site_name = args.site
file_match = valid_file(filename)
# check if this is a valid file
if file_match and file_match.group(1):
# has File:/Image: prefix and extension
filename = file_match.group(2)
else:
# no file extension and/or prefix, probably an article
logging.error(f"Could not parse input '{filename}' as a file.")
sys.exit(1)
filename = unquote(filename) # remove URL encoding for special characters
dest = args.output or filename
logging.debug(f"User agent: {wikiget.USER_AGENT}")
# connect to site and identify ourselves
logging.info(f"Site name: {site_name}")
try:
site = Site(site_name, path=args.path, clients_useragent=wikiget.USER_AGENT)
if args.username and args.password:
site.login(args.username, args.password)
except ConnectionError as e:
# usually this means there is no such site, or there's no network
# connection, though it could be a certificate problem
logging.error("Couldn't connect to specified site.")
logging.debug("Full error message:")
logging.debug(e)
sys.exit(1)
except HTTPError as e:
# most likely a 403 forbidden or 404 not found error for api.php
logging.error(
"Couldn't find the specified wiki's api.php. Check the value of --path."
)
logging.debug("Full error message:")
logging.debug(e)
sys.exit(1)
except (InvalidResponse, LoginError) as e:
# InvalidResponse: site exists, but we couldn't communicate with the
# API endpoint for some reason other than an HTTP error.
# LoginError: missing or invalid credentials
logging.error(e)
sys.exit(1)
# get info about the target file
try:
file = site.images[filename]
except APIError as e:
# an API error at this point likely means access is denied,
# which could happen with a private wiki
logging.error(
"Access denied. Try providing credentials with "
"--username and --password."
)
logging.debug("Full error message:")
for i in e.args:
logging.debug(i)
sys.exit(1)
if file.imageinfo != {}:
# file exists either locally or at a common repository,
# like Wikimedia Commons
file_url = file.imageinfo["url"]
file_size = file.imageinfo["size"]
file_sha1 = file.imageinfo["sha1"]
filename_log = f"Downloading '{filename}' ({file_size} bytes) from {site.host}"
if args.output:
filename_log += f" to '{dest}'"
logging.info(filename_log)
logging.info(f"{file_url}")
if os.path.isfile(dest) and not args.force:
logging.warning(
f"File '{dest}' already exists, skipping download (use -f to ignore)"
)
else:
try:
fd = open(dest, "wb")
except OSError as e:
logging.error(
"File could not be written. The following error was encountered:"
)
logging.error(e)
sys.exit(1)
else:
# download the file(s)
if args.verbose >= wikiget.STD_VERBOSE:
leave_bars = True
else:
leave_bars = False
with tqdm(
leave=leave_bars,
total=file_size,
unit="B",
unit_scale=True,
unit_divisor=wikiget.CHUNKSIZE,
) as progress_bar:
with fd:
res = site.connection.get(file_url, stream=True)
progress_bar.set_postfix(file=dest, refresh=False)
for chunk in res.iter_content(wikiget.CHUNKSIZE):
fd.write(chunk)
progress_bar.update(len(chunk))
# verify file integrity and optionally print details
dl_sha1 = verify_hash(dest)
logging.info(f"Downloaded file SHA1 is {dl_sha1}")
logging.info(f"Server file SHA1 is {file_sha1}")
if dl_sha1 == file_sha1:
logging.info("Hashes match!")
# at this point, we've successfully downloaded the file
else:
logging.error("Hash mismatch! Downloaded file may be corrupt.")
sys.exit(1)
else:
# no file information returned
logging.error(f"Target '{filename}' does not appear to be a valid file.")
sys.exit(1)
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