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734 lines
25 KiB
734 lines
25 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 six
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from .logger import logger
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from time import sleep
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from datetime import datetime
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from xml.sax.saxutils import escape as sax_escape
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try:
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# Python 2.7
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from urllib import unquote as _unquote
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from urllib import quote as _quote
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from urllib import urlencode as _urlencode
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except ImportError:
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# Python 3.x
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from urllib.parse import unquote as _unquote
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from urllib.parse import quote as _quote
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from urllib.parse import urlencode as _urlencode
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from .AppriseLocale import gettext_lazy as _
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from .AppriseAsset import AppriseAsset
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from .utils import parse_url
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from .utils import parse_bool
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from .utils import parse_list
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from .utils import parse_phone_no
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# Used to break a path list into parts
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PATHSPLIT_LIST_DELIM = re.compile(r'[ \t\r\n,\\/]+')
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class PrivacyMode(object):
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# Defines different privacy modes strings can be printed as
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# Astrisk sets 4 of them: e.g. ****
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# This is used for passwords
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Secret = '*'
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# Outer takes the first and last character displaying them with
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# 3 dots between. Hence, 'i-am-a-token' would become 'i...n'
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Outer = 'o'
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# Displays the last four characters
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Tail = 't'
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# Define the HTML Lookup Table
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HTML_LOOKUP = {
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400: 'Bad Request - Unsupported Parameters.',
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401: 'Verification Failed.',
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404: 'Page not found.',
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405: 'Method not allowed.',
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500: 'Internal server error.',
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503: 'Servers are overloaded.',
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}
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class URLBase(object):
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"""
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This is the base class for all URL Manipulation
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"""
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# The default descriptive name associated with the URL
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service_name = None
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# The default simple (insecure) protocol
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# all inheriting entries must provide their protocol lookup
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# protocol:// (in this example they would specify 'protocol')
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protocol = None
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# The default secure protocol
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# all inheriting entries must provide their protocol lookup
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# protocols:// (in this example they would specify 'protocols')
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# This value can be the same as the defined protocol.
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secure_protocol = None
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# Throttle
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request_rate_per_sec = 0
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# The connect timeout is the number of seconds Requests will wait for your
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# client to establish a connection to a remote machine (corresponding to
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# the connect()) call on the socket.
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socket_connect_timeout = 4.0
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# The read timeout is the number of seconds the client will wait for the
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# server to send a response.
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socket_read_timeout = 4.0
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# Handle
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# Maintain a set of tags to associate with this specific notification
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tags = set()
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# Secure sites should be verified against a Certificate Authority
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verify_certificate = True
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# Logging to our global logger
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logger = logger
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# Define a default set of template arguments used for dynamically building
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# details about our individual plugins for developers.
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# Define object templates
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templates = ()
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# Provides a mapping of tokens, certain entries are fixed and automatically
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# configured if found (such as schema, host, user, pass, and port)
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template_tokens = {}
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# Here is where we define all of the arguments we accept on the url
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# such as: schema://whatever/?cto=5.0&rto=15
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# These act the same way as tokens except they are optional and/or
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# have default values set if mandatory. This rule must be followed
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template_args = {
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'verify': {
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'name': _('Verify SSL'),
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# SSL Certificate Authority Verification
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'type': 'bool',
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# Provide a default
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'default': verify_certificate,
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# look up default using the following parent class value at
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# runtime.
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'_lookup_default': 'verify_certificate',
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},
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'rto': {
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'name': _('Socket Read Timeout'),
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'type': 'float',
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# Provide a default
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'default': socket_read_timeout,
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# look up default using the following parent class value at
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# runtime. The variable name identified here (in this case
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# socket_read_timeout) is checked and it's result is placed
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# over-top of the 'default'. This is done because once a parent
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# class inherits this one, the overflow_mode already set as a
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# default 'could' be potentially over-ridden and changed to a
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# different value.
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'_lookup_default': 'socket_read_timeout',
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},
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'cto': {
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'name': _('Socket Connect Timeout'),
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'type': 'float',
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# Provide a default
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'default': socket_connect_timeout,
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# look up default using the following parent class value at
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# runtime. The variable name identified here (in this case
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# socket_connect_timeout) is checked and it's result is placed
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# over-top of the 'default'. This is done because once a parent
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# class inherits this one, the overflow_mode already set as a
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# default 'could' be potentially over-ridden and changed to a
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# different value.
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'_lookup_default': 'socket_connect_timeout',
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},
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}
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# kwargs are dynamically built because a prefix causes us to parse the
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# content slightly differently. The prefix is required and can be either
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# a (+ or -). Below would handle the +key=value:
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# {
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# 'headers': {
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# 'name': _('HTTP Header'),
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# 'prefix': '+',
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# 'type': 'string',
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# },
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# },
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#
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# In a kwarg situation, the 'key' is always presumed to be treated as
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# a string. When the 'type' is defined, it is being defined to respect
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# the 'value'.
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template_kwargs = {}
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def __init__(self, asset=None, **kwargs):
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"""
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Initialize some general logging and common server arguments that will
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keep things consistent when working with the children that
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inherit this class.
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"""
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# Prepare our Asset Object
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self.asset = \
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asset if isinstance(asset, AppriseAsset) else AppriseAsset()
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# Certificate Verification (for SSL calls); default to being enabled
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self.verify_certificate = kwargs.get('verify', True)
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# Secure Mode
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self.secure = kwargs.get('secure', False)
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self.host = URLBase.unquote(kwargs.get('host'))
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self.port = kwargs.get('port')
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if self.port:
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try:
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self.port = int(self.port)
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except (TypeError, ValueError):
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self.logger.warning(
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'Invalid port number specified {}'
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.format(self.port))
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self.port = None
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self.user = kwargs.get('user')
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if self.user:
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# Always unquote user if it exists
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self.user = URLBase.unquote(self.user)
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self.password = kwargs.get('password')
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if self.password:
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# Always unquote the password if it exists
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self.password = URLBase.unquote(self.password)
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# Store our Timeout Variables
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if 'socket_read_timeout' in kwargs:
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try:
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self.socket_read_timeout = \
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float(kwargs.get('socket_read_timeout'))
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except (TypeError, ValueError):
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self.logger.warning(
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'Invalid socket read timeout (rto) was specified {}'
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.format(kwargs.get('socket_read_timeout')))
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if 'socket_connect_timeout' in kwargs:
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try:
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self.socket_connect_timeout = \
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float(kwargs.get('socket_connect_timeout'))
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except (TypeError, ValueError):
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self.logger.warning(
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'Invalid socket connect timeout (cto) was specified {}'
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.format(kwargs.get('socket_connect_timeout')))
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if 'tag' in kwargs:
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# We want to associate some tags with our notification service.
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# the code below gets the 'tag' argument if defined, otherwise
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# it just falls back to whatever was already defined globally
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self.tags = set(parse_list(kwargs.get('tag'), self.tags))
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# Tracks the time any i/o was made to the remote server. This value
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# is automatically set and controlled through the throttle() call.
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self._last_io_datetime = None
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def throttle(self, last_io=None, wait=None):
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"""
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A common throttle control
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if a wait is specified, then it will force a sleep of the
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specified time if it is larger then the calculated throttle
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time.
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"""
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if last_io is not None:
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# Assume specified last_io
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self._last_io_datetime = last_io
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# Get ourselves a reference time of 'now'
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reference = datetime.now()
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if self._last_io_datetime is None:
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# Set time to 'now' and no need to throttle
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self._last_io_datetime = reference
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return
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if self.request_rate_per_sec <= 0.0 and not wait:
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# We're done if there is no throttle limit set
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return
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# If we reach here, we need to do additional logic.
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# If the difference between the reference time and 'now' is less than
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# the defined request_rate_per_sec then we need to throttle for the
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# remaining balance of this time.
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elapsed = (reference - self._last_io_datetime).total_seconds()
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if wait is not None:
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self.logger.debug('Throttling forced for {}s...'.format(wait))
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sleep(wait)
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elif elapsed < self.request_rate_per_sec:
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self.logger.debug('Throttling for {}s...'.format(
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self.request_rate_per_sec - elapsed))
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sleep(self.request_rate_per_sec - elapsed)
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# Update our timestamp before we leave
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self._last_io_datetime = datetime.now()
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return
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def url(self, privacy=False, *args, **kwargs):
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"""
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Assembles the URL associated with the notification based on the
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arguments provied.
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"""
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raise NotImplementedError("url() is implimented by the child class.")
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def __contains__(self, tags):
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"""
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Returns true if the tag specified is associated with this notification.
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tag can also be a tuple, set, and/or list
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"""
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if isinstance(tags, (tuple, set, list)):
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return bool(set(tags) & self.tags)
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# return any match
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return tags in self.tags
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def __str__(self):
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"""
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Returns the url path
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"""
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return self.url(privacy=True)
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@staticmethod
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def escape_html(html, convert_new_lines=False, whitespace=True):
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"""
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Takes html text as input and escapes it so that it won't
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conflict with any xml/html wrapping characters.
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Args:
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html (str): The HTML code to escape
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convert_new_lines (:obj:`bool`, optional): escape new lines (\n)
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whitespace (:obj:`bool`, optional): escape whitespace
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Returns:
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str: The escaped html
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"""
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if not isinstance(html, six.string_types) or not html:
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return ''
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# Escape HTML
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escaped = sax_escape(html, {"'": "'", "\"": """})
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if whitespace:
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# Tidy up whitespace too
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escaped = escaped\
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.replace(u'\t', u' ')\
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.replace(u' ', u' ')
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if convert_new_lines:
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return escaped.replace(u'\n', u'<br/>')
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return escaped
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@staticmethod
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def unquote(content, encoding='utf-8', errors='replace'):
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"""
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Replace %xx escapes by their single-character equivalent. The optional
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encoding and errors parameters specify how to decode percent-encoded
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sequences.
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Wrapper to Python's unquote while remaining compatible with both
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Python 2 & 3 since the reference to this function changed between
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versions.
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Note: errors set to 'replace' means that invalid sequences are
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replaced by a placeholder character.
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Args:
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content (str): The quoted URI string you wish to unquote
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encoding (:obj:`str`, optional): encoding type
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errors (:obj:`str`, errors): how to handle invalid character found
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in encoded string (defined by encoding)
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Returns:
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str: The unquoted URI string
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"""
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if not content:
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return ''
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try:
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# Python v3.x
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return _unquote(content, encoding=encoding, errors=errors)
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except TypeError:
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# Python v2.7
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return _unquote(content)
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@staticmethod
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def quote(content, safe='/', encoding=None, errors=None):
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""" Replaces single character non-ascii characters and URI specific
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ones by their %xx code.
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Wrapper to Python's unquote while remaining compatible with both
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Python 2 & 3 since the reference to this function changed between
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versions.
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Args:
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content (str): The URI string you wish to quote
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safe (str): non-ascii characters and URI specific ones that you
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do not wish to escape (if detected). Setting this
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string to an empty one causes everything to be
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escaped.
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encoding (:obj:`str`, optional): encoding type
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errors (:obj:`str`, errors): how to handle invalid character found
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in encoded string (defined by encoding)
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Returns:
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str: The quoted URI string
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"""
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if not content:
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return ''
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try:
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# Python v3.x
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return _quote(content, safe=safe, encoding=encoding, errors=errors)
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except TypeError:
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# Python v2.7
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return _quote(content, safe=safe)
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@staticmethod
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def pprint(content, privacy=True, mode=PrivacyMode.Outer,
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# privacy print; quoting is ignored when privacy is set to True
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quote=True, safe='/', encoding=None, errors=None):
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"""
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Privacy Print is used to mainpulate the string before passing it into
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part of the URL. It is used to mask/hide private details such as
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tokens, passwords, apikeys, etc from on-lookers. If the privacy=False
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is set, then the quote variable is the next flag checked.
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Quoting is never done if the privacy flag is set to true to avoid
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skewing the expected output.
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"""
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if not privacy:
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if quote:
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# Return quoted string if specified to do so
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return URLBase.quote(
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content, safe=safe, encoding=encoding, errors=errors)
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|
# Return content 'as-is'
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return content
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|
if mode is PrivacyMode.Secret:
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# Return 4 Asterisks
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return '****'
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|
|
if not isinstance(content, six.string_types) or not content:
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# Nothing more to do
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return ''
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if mode is PrivacyMode.Tail:
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# Return the trailing 4 characters
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return '...{}'.format(content[-4:])
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|
|
# Default mode is Outer Mode
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return '{}...{}'.format(content[0:1], content[-1:])
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|
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@staticmethod
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|
def urlencode(query, doseq=False, safe='', encoding=None, errors=None):
|
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"""Convert a mapping object or a sequence of two-element tuples
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|
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|
Wrapper to Python's unquote while remaining compatible with both
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|
Python 2 & 3 since the reference to this function changed between
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versions.
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|
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|
The resulting string is a series of key=value pairs separated by '&'
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characters, where both key and value are quoted using the quote()
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function.
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|
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Note: If the dictionary entry contains an entry that is set to None
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it is not included in the final result set. If you want to
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pass in an empty variable, set it to an empty string.
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|
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|
Args:
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query (str): The dictionary to encode
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doseq (:obj:`bool`, optional): Handle sequences
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safe (:obj:`str`): non-ascii characters and URI specific ones that
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you do not wish to escape (if detected). Setting this string
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to an empty one causes everything to be escaped.
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|
encoding (:obj:`str`, optional): encoding type
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|
errors (:obj:`str`, errors): how to handle invalid character found
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in encoded string (defined by encoding)
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|
Returns:
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str: The escaped parameters returned as a string
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"""
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|
# Tidy query by eliminating any records set to None
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_query = {k: v for (k, v) in query.items() if v is not None}
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try:
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|
# Python v3.x
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|
return _urlencode(
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_query, doseq=doseq, safe=safe, encoding=encoding,
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errors=errors)
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|
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except TypeError:
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|
# Python v2.7
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return _urlencode(_query)
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|
|
@staticmethod
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|
def split_path(path, unquote=True):
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|
"""Splits a URL up into a list object.
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|
Parses a specified URL and breaks it into a list.
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|
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|
Args:
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path (str): The path to split up into a list.
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|
unquote (:obj:`bool`, optional): call unquote on each element
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added to the returned list.
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|
|
|
Returns:
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list: A list containing all of the elements in the path
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"""
|
|
|
|
try:
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paths = PATHSPLIT_LIST_DELIM.split(path.lstrip('/'))
|
|
if unquote:
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|
paths = \
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[URLBase.unquote(x) for x in filter(bool, paths)]
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|
|
|
except AttributeError:
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|
# path is not useable, we still want to gracefully return an
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# empty list
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|
paths = []
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|
return paths
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|
|
@staticmethod
|
|
def parse_list(content, unquote=True):
|
|
"""A wrapper to utils.parse_list() with unquoting support
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|
|
|
Parses a specified set of data and breaks it into a list.
|
|
|
|
Args:
|
|
content (str): The path to split up into a list. If a list is
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|
provided, then it's individual entries are processed.
|
|
|
|
unquote (:obj:`bool`, optional): call unquote on each element
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|
added to the returned list.
|
|
|
|
Returns:
|
|
list: A unique list containing all of the elements in the path
|
|
"""
|
|
|
|
content = parse_list(content)
|
|
if unquote:
|
|
content = \
|
|
[URLBase.unquote(x) for x in filter(bool, content)]
|
|
|
|
return content
|
|
|
|
@staticmethod
|
|
def parse_phone_no(content, unquote=True):
|
|
"""A wrapper to utils.parse_phone_no() with unquoting support
|
|
|
|
Parses a specified set of data and breaks it into a list.
|
|
|
|
Args:
|
|
content (str): The path to split up into a list. If a list is
|
|
provided, then it's individual entries are processed.
|
|
|
|
unquote (:obj:`bool`, optional): call unquote on each element
|
|
added to the returned list.
|
|
|
|
Returns:
|
|
list: A unique list containing all of the elements in the path
|
|
"""
|
|
|
|
if unquote:
|
|
try:
|
|
content = URLBase.unquote(content)
|
|
except TypeError:
|
|
# Nothing further to do
|
|
return []
|
|
|
|
except AttributeError:
|
|
# This exception ONLY gets thrown under Python v2.7 if an
|
|
# object() is passed in place of the content
|
|
return []
|
|
|
|
content = parse_phone_no(content)
|
|
|
|
return content
|
|
|
|
@property
|
|
def app_id(self):
|
|
return self.asset.app_id if self.asset.app_id else ''
|
|
|
|
@property
|
|
def app_desc(self):
|
|
return self.asset.app_desc if self.asset.app_desc else ''
|
|
|
|
@property
|
|
def app_url(self):
|
|
return self.asset.app_url if self.asset.app_url else ''
|
|
|
|
@property
|
|
def request_timeout(self):
|
|
"""This is primarily used to fullfill the `timeout` keyword argument
|
|
that is used by requests.get() and requests.put() calls.
|
|
"""
|
|
return (self.socket_connect_timeout, self.socket_read_timeout)
|
|
|
|
def url_parameters(self, *args, **kwargs):
|
|
"""
|
|
Provides a default set of args to work with. This can greatly
|
|
simplify URL construction in the acommpanied url() function.
|
|
|
|
The following property returns a dictionary (of strings) containing
|
|
all of the parameters that can be set on a URL and managed through
|
|
this class.
|
|
"""
|
|
|
|
return {
|
|
# The socket read timeout
|
|
'rto': str(self.socket_read_timeout),
|
|
# The request/socket connect timeout
|
|
'cto': str(self.socket_connect_timeout),
|
|
# Certificate verification
|
|
'verify': 'yes' if self.verify_certificate else 'no',
|
|
}
|
|
|
|
@staticmethod
|
|
def parse_url(url, verify_host=True):
|
|
"""Parses the URL and returns it broken apart into a dictionary.
|
|
|
|
This is very specific and customized for Apprise.
|
|
|
|
|
|
Args:
|
|
url (str): The URL you want to fully parse.
|
|
verify_host (:obj:`bool`, optional): a flag kept with the parsed
|
|
URL which some child classes will later use to verify SSL
|
|
keys (if SSL transactions take place). Unless under very
|
|
specific circumstances, it is strongly recomended that
|
|
you leave this default value set to True.
|
|
|
|
Returns:
|
|
A dictionary is returned containing the URL fully parsed if
|
|
successful, otherwise None is returned.
|
|
"""
|
|
|
|
results = parse_url(
|
|
url, default_schema='unknown', verify_host=verify_host)
|
|
|
|
if not results:
|
|
# We're done; we failed to parse our url
|
|
return results
|
|
|
|
# if our URL ends with an 's', then assueme our secure flag is set.
|
|
results['secure'] = (results['schema'][-1] == 's')
|
|
|
|
# Support SSL Certificate 'verify' keyword. Default to being enabled
|
|
results['verify'] = True
|
|
|
|
if 'verify' in results['qsd']:
|
|
results['verify'] = parse_bool(
|
|
results['qsd'].get('verify', True))
|
|
|
|
# Password overrides
|
|
if 'password' in results['qsd']:
|
|
results['password'] = results['qsd']['password']
|
|
if 'pass' in results['qsd']:
|
|
results['password'] = results['qsd']['pass']
|
|
|
|
# User overrides
|
|
if 'user' in results['qsd']:
|
|
results['user'] = results['qsd']['user']
|
|
|
|
# Store our socket read timeout if specified
|
|
if 'rto' in results['qsd']:
|
|
results['socket_read_timeout'] = results['qsd']['rto']
|
|
|
|
# Store our socket connect timeout if specified
|
|
if 'cto' in results['qsd']:
|
|
results['socket_connect_timeout'] = results['qsd']['cto']
|
|
|
|
return results
|
|
|
|
@staticmethod
|
|
def http_response_code_lookup(code, response_mask=None):
|
|
"""Parses the interger response code returned by a remote call from
|
|
a web request into it's human readable string version.
|
|
|
|
You can over-ride codes or add new ones by providing your own
|
|
response_mask that contains a dictionary of integer -> string mapped
|
|
variables
|
|
"""
|
|
if isinstance(response_mask, dict):
|
|
# Apply any/all header over-rides defined
|
|
HTML_LOOKUP.update(response_mask)
|
|
|
|
# Look up our response
|
|
try:
|
|
response = HTML_LOOKUP[code]
|
|
|
|
except KeyError:
|
|
response = ''
|
|
|
|
return response
|
|
|
|
def schemas(self):
|
|
"""A simple function that returns a set of all schemas associated
|
|
with this object based on the object.protocol and
|
|
object.secure_protocol
|
|
"""
|
|
|
|
schemas = set([])
|
|
|
|
for key in ('protocol', 'secure_protocol'):
|
|
schema = getattr(self, key, None)
|
|
if isinstance(schema, six.string_types):
|
|
schemas.add(schema)
|
|
|
|
elif isinstance(schema, (set, list, tuple)):
|
|
# Support iterables list types
|
|
for s in schema:
|
|
if isinstance(s, six.string_types):
|
|
schemas.add(s)
|
|
|
|
return schemas
|