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bazarr/libs/apprise/AppriseAttachment.py

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# -*- 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 six
from . import attachment
from . import URLBase
from .AppriseAsset import AppriseAsset
from .logger import logger
from .common import ContentLocation
from .common import CONTENT_LOCATIONS
from .utils import GET_SCHEMA_RE
class AppriseAttachment(object):
"""
Our Apprise Attachment File Manager
"""
def __init__(self, paths=None, asset=None, cache=True, location=None,
**kwargs):
"""
Loads all of the paths/urls specified (if any).
The path can either be a single string identifying one explicit
location, otherwise you can pass in a series of locations to scan
via a list.
By default we cache our responses so that subsiquent calls does not
cause the content to be retrieved again. For local file references
this makes no difference at all. But for remote content, this does
mean more then one call can be made to retrieve the (same) data. This
method can be somewhat inefficient if disabled. Only disable caching
if you understand the consequences.
You can alternatively set the cache value to an int identifying the
number of seconds the previously retrieved can exist for before it
should be considered expired.
It's also worth nothing that the cache value is only set to elements
that are not already of subclass AttachBase()
Optionally set your current ContentLocation in the location argument.
This is used to further handle attachments. The rules are as follows:
- INACCESSIBLE: You simply have disabled use of the object; no
attachments will be retrieved/handled.
- HOSTED: You are hosting an attachment service for others.
In these circumstances all attachments that are LOCAL
based (such as file://) will not be allowed.
- LOCAL: The least restrictive mode as local files can be
referenced in addition to hosted.
In all both HOSTED and LOCAL modes, INACCESSIBLE attachment types will
continue to be inaccessible. However if you set this field (location)
to None (it's default value) the attachment location category will not
be tested in any way (all attachment types will be allowed).
The location field is also a global option that can be set when
initializing the Apprise object.
"""
# Initialize our attachment listings
self.attachments = list()
# Set our cache flag
self.cache = cache
# Prepare our Asset Object
self.asset = \
asset if isinstance(asset, AppriseAsset) else AppriseAsset()
if location is not None and location not in CONTENT_LOCATIONS:
msg = "An invalid Attachment location ({}) was specified." \
.format(location)
logger.warning(msg)
raise TypeError(msg)
# Store our location
self.location = location
# Now parse any paths specified
if paths is not None:
# Store our path(s)
if not self.add(paths):
# Parse Source domain based on from_addr
raise TypeError("One or more attachments could not be added.")
def add(self, attachments, asset=None, cache=None):
"""
Adds one or more attachments into our list.
By default we cache our responses so that subsiquent calls does not
cause the content to be retrieved again. For local file references
this makes no difference at all. But for remote content, this does
mean more then one call can be made to retrieve the (same) data. This
method can be somewhat inefficient if disabled. Only disable caching
if you understand the consequences.
You can alternatively set the cache value to an int identifying the
number of seconds the previously retrieved can exist for before it
should be considered expired.
It's also worth nothing that the cache value is only set to elements
that are not already of subclass AttachBase()
"""
# Initialize our return status
return_status = True
# Initialize our default cache value
cache = cache if cache is not None else self.cache
if asset is None:
# prepare default asset
asset = self.asset
if isinstance(attachments, attachment.AttachBase):
# Go ahead and just add our attachments into our list
self.attachments.append(attachments)
return True
elif isinstance(attachments, six.string_types):
# Save our path
attachments = (attachments, )
elif not isinstance(attachments, (tuple, set, list)):
logger.error(
'An invalid attachment url (type={}) was '
'specified.'.format(type(attachments)))
return False
# Iterate over our attachments
for _attachment in attachments:
if self.location == ContentLocation.INACCESSIBLE:
logger.warning(
"Attachments are disabled; ignoring {}"
.format(_attachment))
return_status = False
continue
if isinstance(_attachment, six.string_types):
logger.debug("Loading attachment: {}".format(_attachment))
# Instantiate ourselves an object, this function throws or
# returns None if it fails
instance = AppriseAttachment.instantiate(
_attachment, asset=asset, cache=cache)
if not isinstance(instance, attachment.AttachBase):
return_status = False
continue
elif not isinstance(_attachment, attachment.AttachBase):
logger.warning(
"An invalid attachment (type={}) was specified.".format(
type(_attachment)))
return_status = False
continue
else:
# our entry is of type AttachBase, so just go ahead and point
# our instance to it for some post processing below
instance = _attachment
# Apply some simple logic if our location flag is set
if self.location and ((
self.location == ContentLocation.HOSTED
and instance.location != ContentLocation.HOSTED)
or instance.location == ContentLocation.INACCESSIBLE):
logger.warning(
"Attachment was disallowed due to accessibility "
"restrictions ({}->{}): {}".format(
self.location, instance.location,
instance.url(privacy=True)))
return_status = False
continue
# Add our initialized plugin to our server listings
self.attachments.append(instance)
# Return our status
return return_status
@staticmethod
def instantiate(url, asset=None, cache=None, suppress_exceptions=True):
"""
Returns the instance of a instantiated attachment plugin based on
the provided Attachment URL. If the url fails to be parsed, then None
is returned.
A specified cache value will over-ride anything set
"""
# Attempt to acquire the schema at the very least to allow our
# attachment based urls.
schema = GET_SCHEMA_RE.match(url)
if schema is None:
# Plan B is to assume we're dealing with a file
schema = attachment.AttachFile.protocol
url = '{}://{}'.format(schema, URLBase.quote(url))
else:
# Ensure our schema is always in lower case
schema = schema.group('schema').lower()
# Some basic validation
if schema not in attachment.SCHEMA_MAP:
logger.warning('Unsupported schema {}.'.format(schema))
return None
# Parse our url details of the server object as dictionary containing
# all of the information parsed from our URL
results = attachment.SCHEMA_MAP[schema].parse_url(url)
if not results:
# Failed to parse the server URL
logger.warning('Unparseable URL {}.'.format(url))
return None
# Prepare our Asset Object
results['asset'] = \
asset if isinstance(asset, AppriseAsset) else AppriseAsset()
if cache is not None:
# Force an over-ride of the cache value to what we have specified
results['cache'] = cache
if suppress_exceptions:
try:
# Attempt to create an instance of our plugin using the parsed
# URL information
attach_plugin = \
attachment.SCHEMA_MAP[results['schema']](**results)
except Exception:
# the arguments are invalid or can not be used.
logger.warning('Could not load URL: %s' % url)
return None
else:
# Attempt to create an instance of our plugin using the parsed
# URL information but don't wrap it in a try catch
attach_plugin = attachment.SCHEMA_MAP[results['schema']](**results)
return attach_plugin
def clear(self):
"""
Empties our attachment list
"""
self.attachments[:] = []
def size(self):
"""
Returns the total size of accumulated attachments
"""
return sum([len(a) for a in self.attachments if len(a) > 0])
def pop(self, index=-1):
"""
Removes an indexed Apprise Attachment from the stack and returns it.
by default the last element is poped from the list
"""
# Remove our entry
return self.attachments.pop(index)
def __getitem__(self, index):
"""
Returns the indexed entry of a loaded apprise attachments
"""
return self.attachments[index]
def __bool__(self):
"""
Allows the Apprise object to be wrapped in an Python 3.x based 'if
statement'. True is returned if at least one service has been loaded.
"""
return True if self.attachments else False
def __nonzero__(self):
"""
Allows the Apprise object to be wrapped in an Python 2.x based 'if
statement'. True is returned if at least one service has been loaded.
"""
return True if self.attachments else False
def __iter__(self):
"""
Returns an iterator to our attachment list
"""
return iter(self.attachments)
def __len__(self):
"""
Returns the number of attachment entries loaded
"""
return len(self.attachments)
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