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