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335 lines
12 KiB
335 lines
12 KiB
# -*- coding: utf-8 -*-
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#
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# Copyright (C) 2019 Chris Caron <lead2gold@gmail.com>
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# All rights reserved.
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#
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# This code is licensed under the MIT License.
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#
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# Permission is hereby granted, free of charge, to any person obtaining a copy
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# of this software and associated documentation files(the "Software"), to deal
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# in the Software without restriction, including without limitation the rights
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# to use, copy, modify, merge, publish, distribute, sublicense, and / or sell
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# copies of the Software, and to permit persons to whom the Software is
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# furnished to do so, subject to the following conditions :
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#
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# The above copyright notice and this permission notice shall be included in
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# all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE
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# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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# THE SOFTWARE.
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import re
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import os
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import requests
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from tempfile import NamedTemporaryFile
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from .AttachBase import AttachBase
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from ..common import ContentLocation
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from ..URLBase import PrivacyMode
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from ..AppriseLocale import gettext_lazy as _
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class AttachHTTP(AttachBase):
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"""
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A wrapper for HTTP based attachment sources
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"""
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# The default descriptive name associated with the service
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service_name = _('Web Based')
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# The default protocol
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protocol = 'http'
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# The default secure protocol
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secure_protocol = 'https'
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# The number of bytes in memory to read from the remote source at a time
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chunk_size = 8192
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# Web based requests are remote/external to our current location
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location = ContentLocation.HOSTED
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def __init__(self, headers=None, **kwargs):
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"""
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Initialize HTTP Object
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headers can be a dictionary of key/value pairs that you want to
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additionally include as part of the server headers to post with
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"""
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super(AttachHTTP, self).__init__(**kwargs)
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self.schema = 'https' if self.secure else 'http'
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self.fullpath = kwargs.get('fullpath')
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if not isinstance(self.fullpath, str):
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self.fullpath = '/'
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self.headers = {}
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if headers:
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# Store our extra headers
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self.headers.update(headers)
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# Where our content is written to upon a call to download.
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self._temp_file = None
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# Our Query String Dictionary; we use this to track arguments
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# specified that aren't otherwise part of this class
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self.qsd = {k: v for k, v in kwargs.get('qsd', {}).items()
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if k not in self.template_args}
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return
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def download(self, **kwargs):
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"""
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Perform retrieval of the configuration based on the specified request
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"""
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if self.location == ContentLocation.INACCESSIBLE:
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# our content is inaccessible
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return False
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# Ensure any existing content set has been invalidated
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self.invalidate()
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# prepare header
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headers = {
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'User-Agent': self.app_id,
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}
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# Apply any/all header over-rides defined
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headers.update(self.headers)
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auth = None
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if self.user:
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auth = (self.user, self.password)
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url = '%s://%s' % (self.schema, self.host)
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if isinstance(self.port, int):
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url += ':%d' % self.port
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url += self.fullpath
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self.logger.debug('HTTP POST URL: %s (cert_verify=%r)' % (
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url, self.verify_certificate,
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))
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# Where our request object will temporarily live.
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r = None
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# Always call throttle before any remote server i/o is made
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self.throttle()
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try:
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# Make our request
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with requests.get(
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url,
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headers=headers,
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auth=auth,
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params=self.qsd,
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verify=self.verify_certificate,
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timeout=self.request_timeout,
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stream=True) as r:
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# Handle Errors
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r.raise_for_status()
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# Get our file-size (if known)
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try:
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file_size = int(r.headers.get('Content-Length', '0'))
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except (TypeError, ValueError):
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# Handle edge case where Content-Length is a bad value
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file_size = 0
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# Perform a little Q/A on file limitations and restrictions
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if self.max_file_size > 0 and file_size > self.max_file_size:
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# The content retrieved is to large
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self.logger.error(
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'HTTP response exceeds allowable maximum file length '
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'({}KB): {}'.format(
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int(self.max_file_size / 1024),
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self.url(privacy=True)))
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# Return False (signifying a failure)
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return False
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# Detect config format based on mime if the format isn't
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# already enforced
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self.detected_mimetype = r.headers.get('Content-Type')
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d = r.headers.get('Content-Disposition', '')
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result = re.search(
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"filename=['\"]?(?P<name>[^'\"]+)['\"]?", d, re.I)
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if result:
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self.detected_name = result.group('name').strip()
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# Create a temporary file to work with
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self._temp_file = NamedTemporaryFile()
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# Get our chunk size
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chunk_size = self.chunk_size
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# Track all bytes written to disk
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bytes_written = 0
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# If we get here, we can now safely write our content to disk
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for chunk in r.iter_content(chunk_size=chunk_size):
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# filter out keep-alive chunks
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if chunk:
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self._temp_file.write(chunk)
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bytes_written = self._temp_file.tell()
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# Prevent a case where Content-Length isn't provided
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# we don't want to fetch beyond our limits
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if self.max_file_size > 0:
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if bytes_written > self.max_file_size:
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# The content retrieved is to large
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self.logger.error(
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'HTTP response exceeds allowable maximum '
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'file length ({}KB): {}'.format(
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int(self.max_file_size / 1024),
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self.url(privacy=True)))
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# Invalidate any variables previously set
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self.invalidate()
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# Return False (signifying a failure)
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return False
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elif bytes_written + chunk_size \
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> self.max_file_size:
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# Adjust out next read to accomodate up to our
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# limit +1. This will prevent us from readig
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# to much into our memory buffer
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self.max_file_size - bytes_written + 1
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# Ensure our content is flushed to disk for post-processing
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self._temp_file.flush()
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# Set our minimum requirements for a successful download() call
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self.download_path = self._temp_file.name
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if not self.detected_name:
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self.detected_name = os.path.basename(self.fullpath)
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except requests.RequestException as e:
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self.logger.error(
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'A Connection error occurred retrieving HTTP '
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'configuration from %s.' % self.host)
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self.logger.debug('Socket Exception: %s' % str(e))
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# Invalidate any variables previously set
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self.invalidate()
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# Return False (signifying a failure)
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return False
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except (IOError, OSError):
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# IOError is present for backwards compatibility with Python
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# versions older then 3.3. >= 3.3 throw OSError now.
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# Could not open and/or write the temporary file
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self.logger.error(
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'Could not write attachment to disk: {}'.format(
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self.url(privacy=True)))
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# Invalidate any variables previously set
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self.invalidate()
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# Return False (signifying a failure)
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return False
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# Return our success
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return True
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def invalidate(self):
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"""
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Close our temporary file
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"""
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if self._temp_file:
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self._temp_file.close()
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self._temp_file = None
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super(AttachHTTP, self).invalidate()
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def url(self, privacy=False, *args, **kwargs):
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"""
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Returns the URL built dynamically based on specified arguments.
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"""
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# Our URL parameters
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params = self.url_parameters(privacy=privacy, *args, **kwargs)
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# Prepare our cache value
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if self.cache is not None:
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if isinstance(self.cache, bool) or not self.cache:
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cache = 'yes' if self.cache else 'no'
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else:
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cache = int(self.cache)
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# Set our cache value
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params['cache'] = cache
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if self._mimetype:
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# A format was enforced
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params['mime'] = self._mimetype
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if self._name:
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# A name was enforced
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params['name'] = self._name
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# Append our headers into our parameters
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params.update({'+{}'.format(k): v for k, v in self.headers.items()})
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# Apply any remaining entries to our URL
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params.update(self.qsd)
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# Determine Authentication
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auth = ''
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if self.user and self.password:
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auth = '{user}:{password}@'.format(
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user=self.quote(self.user, safe=''),
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password=self.pprint(
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self.password, privacy, mode=PrivacyMode.Secret, safe=''),
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)
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elif self.user:
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auth = '{user}@'.format(
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user=self.quote(self.user, safe=''),
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)
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default_port = 443 if self.secure else 80
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return '{schema}://{auth}{hostname}{port}{fullpath}?{params}'.format(
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schema=self.secure_protocol if self.secure else self.protocol,
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auth=auth,
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hostname=self.quote(self.host, safe=''),
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port='' if self.port is None or self.port == default_port
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else ':{}'.format(self.port),
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fullpath=self.quote(self.fullpath, safe='/'),
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params=self.urlencode(params),
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)
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@staticmethod
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def parse_url(url):
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"""
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Parses the URL and returns enough arguments that can allow
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us to re-instantiate this object.
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"""
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results = AttachBase.parse_url(url)
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if not results:
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# We're done early as we couldn't load the results
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return results
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# Add our headers that the user can potentially over-ride if they wish
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# to to our returned result set
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results['headers'] = results['qsd-']
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results['headers'].update(results['qsd+'])
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return results
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