class ChunkedDownloader(object):
"""
Handles making requests, reading responses and feeds data to ResumableFileDownload object
"""
LOG = logging.getLogger(__name__)
def __init__(self, media_cleaner):
self.HISRA_NET_LOC = urlparse(SERVER_URL).netloc
self.MEDIA_CLEANER = MediaCleaner()
def set_hisra_net_loc(self, server_media_url):
netloc = urlparse(server_media_url).netloc
if netloc:
self.HISRA_NET_LOC = netloc
def download(self, content):
url = content.content_uri
headers = {'Content-Type':Media.VALID_CONTENT_TYPES[content.content_type]}
if urlparse(url).netloc == self.HISRA_NET_LOC:
headers['Authorization'] = AUTHORIZATION_HEADER
response = requests.get(
url=url,
timeout=MEDIA_DOWNLOAD_TIMEOUTS,
stream=True,
headers=headers,
verify=SERVER_VERIFY
)
if response.status_code != 200:
raise Exception("Expected 200 response got: %s", response.status_code)
filename = self.get_filename(response, url)
md5 = response.headers.get('Content-MD5')
content_length = int(response.headers['Content-Length'])
if content_length is None:
raise Exception("Response from {0} had no content-length. Download aborted.".format(url))
self.MEDIA_CLEANER.clean_media(content_length)
resumable_download = ResumableFileDownload(url, MEDIA_FOLDER, filename,
md5, content_length)
if resumable_download.is_complete():
response.close()
return resumable_download.complete_filepath
bytes_downloaded = resumable_download.bytes_downloaded()
if bytes_downloaded < content_length:
if bytes_downloaded > 0:
response.close()
self.LOG.debug('Resuming a download with range: %s-%s', bytes_downloaded, resumable_download.expected_size)
headers['Range'] = 'bytes={0}-{1}'.format(bytes_downloaded, resumable_download.expected_size)
response = requests.get(url=url,
timeout=MEDIA_DOWNLOAD_TIMEOUTS,
stream=True,
headers=headers,
verify=SERVER_VERIFY)
if response.status_code != 206:
raise Exception("Requested a range(206) but got: %s", response.status_code)
resumable_download.stream_to_file(response.iter_content)
response.close()
resumable_download.download_complete()
return resumable_download.complete_filepath
@staticmethod
def get_filename(response, url):
filename = response.headers.get('Content-Disposition')
if filename:
filename = re.findall("filename=(.+)", response.headers['Content-Disposition'])
if filename:
return filename[0].strip()
else:
return ChunkedDownloader.slugify(url)
@staticmethod
def slugify(value):
"""
Convert to ASCII. Convert spaces to hyphens.
Remove characters that aren't alphanumerics, underscores, or hyphens.
Convert to lowercase. Also strip leading and trailing whitespace.
original slugify by:
Copyright (c) Django Software Foundation and individual contributors.
All rights reserved.
Redistribution and use in source and binary forms, with or without modification,
are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
3. Neither the name of Django nor the names of its contributors may be used
to endorse or promote products derived from this software without
specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
"""
value = unicode(value)
value = unicodedata.normalize('NFKD', value).encode('ascii', 'ignore').decode('ascii')
value = re.sub('[^\w\s-]', '', value).strip().lower()
return re.sub('[-\s]+', '-', value)