bazarr/libs/apprise/config/ConfigHTTP.py

272 lines
9.0 KiB
Python

# -*- coding: utf-8 -*-
#
# Copyright (C) 2019 Chris Caron <lead2gold@gmail.com>
# All rights reserved.
#
# This code is licensed under the MIT License.
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files(the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and / or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions :
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
import re
import six
import requests
from .ConfigBase import ConfigBase
from ..common import ConfigFormat
from ..URLBase import PrivacyMode
from ..AppriseLocale import gettext_lazy as _
# Support YAML formats
# text/yaml
# text/x-yaml
# application/yaml
# application/x-yaml
MIME_IS_YAML = re.compile('(text|application)/(x-)?yaml', re.I)
# Support TEXT formats
# text/plain
# text/html
MIME_IS_TEXT = re.compile('text/(plain|html)', re.I)
class ConfigHTTP(ConfigBase):
"""
A wrapper for HTTP based configuration sources
"""
# The default descriptive name associated with the service
service_name = _('Web Based')
# The default protocol
protocol = 'http'
# The default secure protocol
secure_protocol = 'https'
# The maximum number of seconds to wait for a connection to be established
# before out-right just giving up
connection_timeout_sec = 5.0
# If an HTTP error occurs, define the number of characters you still want
# to read back. This is useful for debugging purposes, but nothing else.
# The idea behind enforcing this kind of restriction is to prevent abuse
# from queries to services that may be untrusted.
max_error_buffer_size = 2048
def __init__(self, headers=None, **kwargs):
"""
Initialize HTTP Object
headers can be a dictionary of key/value pairs that you want to
additionally include as part of the server headers to post with
"""
super(ConfigHTTP, self).__init__(**kwargs)
self.schema = 'https' if self.secure else 'http'
self.fullpath = kwargs.get('fullpath')
if not isinstance(self.fullpath, six.string_types):
self.fullpath = '/'
self.headers = {}
if headers:
# Store our extra headers
self.headers.update(headers)
return
def url(self, privacy=False, *args, **kwargs):
"""
Returns the URL built dynamically based on specified arguments.
"""
# Prepare our cache value
if isinstance(self.cache, bool) or not self.cache:
cache = 'yes' if self.cache else 'no'
else:
cache = int(self.cache)
# Define any arguments set
args = {
'verify': 'yes' if self.verify_certificate else 'no',
'encoding': self.encoding,
'cache': cache,
}
if self.config_format:
# A format was enforced; make sure it's passed back with the url
args['format'] = self.config_format
# Append our headers into our args
args.update({'+{}'.format(k): v for k, v in self.headers.items()})
# Determine Authentication
auth = ''
if self.user and self.password:
auth = '{user}:{password}@'.format(
user=self.quote(self.user, safe=''),
password=self.pprint(
self.password, privacy, mode=PrivacyMode.Secret, safe=''),
)
elif self.user:
auth = '{user}@'.format(
user=self.quote(self.user, safe=''),
)
default_port = 443 if self.secure else 80
return '{schema}://{auth}{hostname}{port}{fullpath}/?{args}'.format(
schema=self.secure_protocol if self.secure else self.protocol,
auth=auth,
hostname=self.quote(self.host, safe=''),
port='' if self.port is None or self.port == default_port
else ':{}'.format(self.port),
fullpath=self.quote(self.fullpath, safe='/'),
args=self.urlencode(args),
)
def read(self, **kwargs):
"""
Perform retrieval of the configuration based on the specified request
"""
# prepare XML Object
headers = {
'User-Agent': self.app_id,
}
# Apply any/all header over-rides defined
headers.update(self.headers)
auth = None
if self.user:
auth = (self.user, self.password)
url = '%s://%s' % (self.schema, self.host)
if isinstance(self.port, int):
url += ':%d' % self.port
url += self.fullpath
self.logger.debug('HTTP POST URL: %s (cert_verify=%r)' % (
url, self.verify_certificate,
))
# Prepare our response object
response = None
# Where our request object will temporarily live.
r = None
# Always call throttle before any remote server i/o is made
self.throttle()
try:
# Make our request
with requests.post(
url,
headers=headers,
auth=auth,
verify=self.verify_certificate,
timeout=self.connection_timeout_sec,
stream=True) as r:
# Handle Errors
r.raise_for_status()
# Get our file-size (if known)
try:
file_size = int(r.headers.get('Content-Length', '0'))
except (TypeError, ValueError):
# Handle edge case where Content-Length is a bad value
file_size = 0
# Store our response
if self.max_buffer_size > 0 \
and file_size > self.max_buffer_size:
# Provide warning of data truncation
self.logger.error(
'HTTP config response exceeds maximum buffer length '
'({}KB);'.format(int(self.max_buffer_size / 1024)))
# Return None - buffer execeeded
return None
# Store our result (but no more than our buffer length)
response = r.content[:self.max_buffer_size + 1]
# Verify that our content did not exceed the buffer size:
if len(response) > self.max_buffer_size:
# Provide warning of data truncation
self.logger.error(
'HTTP config response exceeds maximum buffer length '
'({}KB);'.format(int(self.max_buffer_size / 1024)))
# Return None - buffer execeeded
return None
# Detect config format based on mime if the format isn't
# already enforced
content_type = r.headers.get(
'Content-Type', 'application/octet-stream')
if self.config_format is None and content_type:
if MIME_IS_YAML.match(content_type) is not None:
# YAML data detected based on header content
self.default_config_format = ConfigFormat.YAML
elif MIME_IS_TEXT.match(content_type) is not None:
# TEXT data detected based on header content
self.default_config_format = ConfigFormat.TEXT
except requests.RequestException as e:
self.logger.error(
'A Connection error occured retrieving HTTP '
'configuration from %s.' % self.host)
self.logger.debug('Socket Exception: %s' % str(e))
# Return None (signifying a failure)
return None
# Return our response object
return response
@staticmethod
def parse_url(url):
"""
Parses the URL and returns enough arguments that can allow
us to substantiate this object.
"""
results = ConfigBase.parse_url(url)
if not results:
# We're done early as we couldn't load the results
return results
# Add our headers that the user can potentially over-ride if they wish
# to to our returned result set
results['headers'] = results['qsd-']
results['headers'].update(results['qsd+'])
return results