apprise-api/apprise_api/api/utils.py

746 lines
24 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 binascii
import os
import tempfile
import shutil
import gzip
import apprise
import hashlib
import errno
import base64
import requests
from json import dumps
from django.conf import settings
from datetime import datetime
# import the logging library
import logging
# Get an instance of a logger
logger = logging.getLogger('django')
class AppriseStoreMode(object):
"""
Defines the store modes of configuration
"""
# This is the default option. Content is cached and written by
# it's key
HASH = 'hash'
# Content is written straight to disk using it's key
# there is nothing further done
SIMPLE = 'simple'
# When set to disabled; stateful functionality is disabled
DISABLED = 'disabled'
class AttachmentPayload(object):
"""
Defines the supported Attachment Payload Types
"""
# BASE64
BASE64 = 'base64'
# URL request
URL = 'url'
STORE_MODES = (
AppriseStoreMode.HASH,
AppriseStoreMode.SIMPLE,
AppriseStoreMode.DISABLED,
)
# Access our Attachment Manager Singleton
A_MGR = apprise.AttachmentManager.AttachmentManager()
# Access our Notification Manager Singleton
N_MGR = apprise.NotificationManager.NotificationManager()
class Attachment(A_MGR['file']):
"""
A Light Weight Attachment Object for Auto-cleanup that wraps the Apprise
Attachments
"""
def __init__(self, filename, path=None, delete=True, **kwargs):
"""
Initialize our attachment
"""
self._filename = filename
self.delete = delete
self._path = None
try:
os.makedirs(settings.APPRISE_ATTACH_DIR, exist_ok=True)
except OSError:
# Permission error
raise ValueError('Could not create directory {}'.format(
settings.APPRISE_ATTACH_DIR))
if not path:
try:
d, path = tempfile.mkstemp(dir=settings.APPRISE_ATTACH_DIR)
# Close our file descriptor
os.close(d)
except FileNotFoundError:
raise ValueError(
'Could not prepare {} attachment in {}'.format(
filename, settings.APPRISE_ATTACH_DIR))
self._path = path
# Prepare our item
super().__init__(path=self._path, name=filename, **kwargs)
# Update our file size based on the settings value
self.max_file_size = settings.APPRISE_ATTACH_SIZE
@property
def filename(self):
return self._filename
@property
def size(self):
"""
Return filesize
"""
return os.stat(self._path).st_size
def __del__(self):
"""
De-Construtor is used to tidy up files during garbage collection
"""
if self.delete and self._path:
try:
os.remove(self._path)
except FileNotFoundError:
# no problem
pass
class HTTPAttachment(A_MGR['http']):
"""
A Light Weight Attachment Object for Auto-cleanup that wraps the Apprise
Web Attachments
"""
def __init__(self, filename, delete=True, **kwargs):
"""
Initialize our attachment
"""
self._filename = filename
self.delete = delete
self._path = None
try:
os.makedirs(settings.APPRISE_ATTACH_DIR, exist_ok=True)
except OSError:
# Permission error
raise ValueError('Could not create directory {}'.format(
settings.APPRISE_ATTACH_DIR))
try:
d, self._path = tempfile.mkstemp(dir=settings.APPRISE_ATTACH_DIR)
# Close our file descriptor
os.close(d)
except FileNotFoundError:
raise ValueError(
'Could not prepare {} attachment in {}'.format(
filename, settings.APPRISE_ATTACH_DIR))
# Prepare our item
super().__init__(name=filename, **kwargs)
# Update our file size based on the settings value
self.max_file_size = settings.APPRISE_ATTACH_SIZE
@property
def filename(self):
return self._filename
@property
def size(self):
"""
Return filesize
"""
return 0 if not self else os.stat(self._path).st_size
def __del__(self):
"""
De-Construtor is used to tidy up files during garbage collection
"""
if self.delete and self._path:
try:
os.remove(self._path)
except FileNotFoundError:
# no problem
pass
def parse_attachments(attachment_payload, files_request):
"""
Takes the payload provided in a `/notify` call and extracts the
attachments out of it.
Content is written to a temporary directory until the garbage
collection kicks in.
"""
attachments = []
# Attachment Count
count = sum([
0 if not isinstance(attachment_payload, (set, tuple, list))
else len(attachment_payload),
0 if not isinstance(files_request, dict) else len(files_request),
])
if isinstance(attachment_payload, (dict, str, bytes)):
# Convert and adjust counter
attachment_payload = (attachment_payload, )
count += 1
if settings.APPRISE_MAX_ATTACHMENTS <= 0 or \
(settings.APPRISE_MAX_ATTACHMENTS > 0 and
count > settings.APPRISE_MAX_ATTACHMENTS):
raise ValueError(
"There is a maximum of %d attachments" %
settings.APPRISE_MAX_ATTACHMENTS
if settings.APPRISE_MAX_ATTACHMENTS > 0 else 0)
if isinstance(attachment_payload, (tuple, list, set)):
for no, entry in enumerate(attachment_payload, start=1):
if isinstance(entry, (str, bytes)):
filename = "attachment.%.3d" % no
elif isinstance(entry, dict):
try:
filename = entry.get("filename", "").strip()
# Max filename size is 250
if len(filename) > 250:
raise ValueError(
"The filename associated with attachment "
"%d is too long" % no)
elif not filename:
filename = "attachment.%.3d" % no
except AttributeError:
# not a string that was provided
raise ValueError(
"An invalid filename was provided for attachment %d" %
no)
else:
# you must pass in a base64 string, or a dict containing our
# required parameters
raise ValueError(
"An invalid filename was provided for attachment %d" % no)
#
# Prepare our Attachment
#
if isinstance(entry, str):
if not re.match(r'^https?://.+', entry[:10], re.I):
# We failed to retrieve the product
raise ValueError(
"Failed to load attachment "
"%d (not web request): %s" % (no, entry))
attachment = HTTPAttachment(
filename, **A_MGR['http'].parse_url(entry))
if not attachment:
# We failed to retrieve the attachment
raise ValueError(
"Failed to retrieve attachment %d: %s" % (no, entry))
else: # web, base64 or raw
attachment = Attachment(filename)
try:
with open(attachment.path, 'wb') as f:
# Write our content to disk
if isinstance(entry, dict) and \
AttachmentPayload.BASE64 in entry:
# BASE64
f.write(
base64.b64decode(
entry[AttachmentPayload.BASE64]))
elif isinstance(entry, dict) and \
AttachmentPayload.URL in entry:
attachment = HTTPAttachment(
filename, **A_MGR['http']
.parse_url(entry[AttachmentPayload.URL]))
if not attachment:
# We failed to retrieve the attachment
raise ValueError(
"Failed to retrieve attachment "
"%d: %s" % (no, entry))
elif isinstance(entry, bytes):
# RAW
f.write(entry)
else:
raise ValueError(
"Invalid filetype was provided for "
"attachment %s" % filename)
except binascii.Error:
# The file ws not base64 encoded
raise ValueError(
"Invalid filecontent was provided for attachment %s" %
filename)
except OSError:
raise ValueError(
"Could not write attachment %s to disk" % filename)
#
# Some Validation
#
if settings.APPRISE_MAX_ATTACHMENT_SIZE > 0 and \
attachment.size > settings.APPRISE_MAX_ATTACHMENT_SIZE:
raise ValueError(
"attachment %s's filesize is to large" % filename)
# Add our attachment
attachments.append(attachment)
#
# Now handle the request.FILES
#
if isinstance(files_request, dict):
for no, (key, meta) in enumerate(
files_request.items(), start=len(attachments) + 1):
try:
# Filetype is presumed to be of base class
# django.core.files.UploadedFile
filename = meta.name.strip()
# Max filename size is 250
if len(filename) > 250:
raise ValueError(
"The filename associated with attachment "
"%d is too long" % no)
elif not filename:
filename = "attachment.%.3d" % no
except (AttributeError, TypeError):
raise ValueError(
"An invalid filename was provided for attachment %d" % no)
#
# Prepare our Attachment
#
attachment = Attachment(filename)
try:
with open(attachment.path, 'wb') as f:
# Write our content to disk
f.write(meta.read())
except OSError:
raise ValueError(
"Could not write attachment %s to disk" % filename)
#
# Some Validation
#
if settings.APPRISE_MAX_ATTACHMENT_SIZE > 0 and \
attachment.size > settings.APPRISE_MAX_ATTACHMENT_SIZE:
raise ValueError(
"attachment %s's filesize is to large" % filename)
# Add our attachment
attachments.append(attachment)
return attachments
class SimpleFileExtension(object):
"""
Defines the simple file exension lookups
"""
# Simple Configuration file
TEXT = 'cfg'
# YAML Configuration file
YAML = 'yml'
SIMPLE_FILE_EXTENSION_MAPPING = {
apprise.ConfigFormat.TEXT: SimpleFileExtension.TEXT,
apprise.ConfigFormat.YAML: SimpleFileExtension.YAML,
SimpleFileExtension.TEXT: SimpleFileExtension.TEXT,
SimpleFileExtension.YAML: SimpleFileExtension.YAML,
}
SIMPLE_FILE_EXTENSIONS = (SimpleFileExtension.TEXT, SimpleFileExtension.YAML)
class AppriseConfigCache(object):
"""
Designed to make it easy to store/read contact back from disk in a cache
type structure that is fast.
"""
def __init__(self, cache_root, salt="apprise", mode=AppriseStoreMode.HASH):
"""
Works relative to the cache_root
"""
self.root = cache_root
self.salt = salt.encode()
self.mode = mode.strip().lower()
if self.mode not in STORE_MODES:
self.mode = AppriseStoreMode.DISABLED
logger.error(
'APPRISE_STATEFUL_MODE {} is not supported; '
'reverted to {}.'.format(mode, self.mode))
def put(self, key, content, fmt):
"""
Based on the key specified, content is written to disk (compressed)
key: is an alphanumeric string needed to write and read back this
file being written.
content: the content to be written to disk
fmt: the content config format (of type apprise.ConfigFormat)
"""
# There isn't a lot of error handling done here as it is presumed most
# of the checking has been done higher up.
if self.mode == AppriseStoreMode.DISABLED:
# Do nothing
return False
# First two characters are reserved for cache level directory writing.
path, filename = self.path(key)
try:
os.makedirs(path, exist_ok=True)
except OSError:
# Permission error
logger.error('Could not create directory {}'.format(path))
return False
# Write our file to a temporary file
d, tmp_path = tempfile.mkstemp(suffix='.tmp', dir=path)
# Close the file handle provided by mkstemp()
# We're reopening it, and it can't be renamed while open on Windows
os.close(d)
if self.mode == AppriseStoreMode.HASH:
try:
with gzip.open(tmp_path, 'wb') as f:
# Write our content to disk
f.write(content.encode())
except OSError:
# Handle failure
os.remove(tmp_path)
return False
else: # AppriseStoreMode.SIMPLE
# Update our file extenion based on our fmt
fmt = SIMPLE_FILE_EXTENSION_MAPPING[fmt]
try:
with open(tmp_path, 'wb') as f:
# Write our content to disk
f.write(content.encode())
except OSError:
# Handle failure
os.remove(tmp_path)
return False
# If we reach here we successfully wrote the content. We now safely
# move our configuration into place. The following writes our content
# to disk
shutil.move(tmp_path, os.path.join(
path, '{}.{}'.format(filename, fmt)))
# perform tidy of any other lingering files of other type in case
# configuration changed from TEXT -> YAML or YAML -> TEXT
if self.mode == AppriseStoreMode.HASH:
if self.clear(key, set(apprise.CONFIG_FORMATS) - {fmt}) is False:
# We couldn't remove an existing entry; clear what we just
# created
self.clear(key, {fmt})
# fail
return False
elif self.clear(key, set(SIMPLE_FILE_EXTENSIONS) - {fmt}) is False:
# We couldn't remove an existing entry; clear what we just
# created
self.clear(key, {fmt})
# fail
return False
return True
def get(self, key):
"""
Based on the key specified, content is written to disk (compressed)
key: is an alphanumeric string needed to write and read back this
file being written.
The function returns a tuple of (content, fmt) where the content
is the uncompressed content found in the file and fmt is the
content representation (of type apprise.ConfigFormat).
If no data was found, then (None, None) is returned.
"""
if self.mode == AppriseStoreMode.DISABLED:
# Do nothing
return (None, '')
# There isn't a lot of error handling done here as it is presumed most
# of the checking has been done higher up.
# First two characters are reserved for cache level directory writing.
path, filename = self.path(key)
# prepare our format to return
fmt = None
# Test the only possible hashed files we expect to find
if self.mode == AppriseStoreMode.HASH:
text_file = os.path.join(
path, '{}.{}'.format(filename, apprise.ConfigFormat.TEXT))
yaml_file = os.path.join(
path, '{}.{}'.format(filename, apprise.ConfigFormat.YAML))
else: # AppriseStoreMode.SIMPLE
text_file = os.path.join(
path, '{}.{}'.format(filename, SimpleFileExtension.TEXT))
yaml_file = os.path.join(
path, '{}.{}'.format(filename, SimpleFileExtension.YAML))
if os.path.isfile(text_file):
fmt = apprise.ConfigFormat.TEXT
path = text_file
elif os.path.isfile(yaml_file):
fmt = apprise.ConfigFormat.YAML
path = yaml_file
else:
# Not found; we set the fmt to something other than none as
# an indication for the upstream handling to know that we didn't
# fail on error
return (None, '')
# Initialize our content
content = None
if self.mode == AppriseStoreMode.HASH:
try:
with gzip.open(path, 'rb') as f:
# Write our content to disk
content = f.read().decode()
except OSError:
# all none return means to let upstream know we had a hard
# failure
return (None, None)
else: # AppriseStoreMode.SIMPLE
try:
with open(path, 'rb') as f:
# Write our content to disk
content = f.read().decode()
except OSError:
# all none return means to let upstream know we had a hard
# failure
return (None, None)
# return our read content
return (content, fmt)
def clear(self, key, formats=None):
"""
Removes any content associated with the specified key should it
exist.
None is returned if there was nothing to clear
True is returned if content was cleared
False is returned if an internal error prevented data from being
cleared
"""
# Default our response None
response = None
if self.mode == AppriseStoreMode.DISABLED:
# Do nothing
return response
if formats is None:
formats = apprise.CONFIG_FORMATS
path, filename = self.path(key)
for fmt in formats:
# Eliminate any existing content if present
try:
# Handle failure
os.remove(os.path.join(path, '{}.{}'.format(
filename,
fmt if self.mode == AppriseStoreMode.HASH
else SIMPLE_FILE_EXTENSION_MAPPING[fmt])))
# If we reach here, an element was removed
response = True
except OSError as e:
if e.errno != errno.ENOENT:
# We were unable to remove the file
response = False
return response
def path(self, key):
"""
returns the path and filename content should be written to based on the
specified key
"""
if self.mode == AppriseStoreMode.HASH:
encoded_key = hashlib.sha224(self.salt + key.encode()).hexdigest()
path = os.path.join(self.root, encoded_key[0:2])
return (path, encoded_key[2:])
else: # AppriseStoreMode.SIMPLE
return (self.root, key)
# Initialize our singleton
ConfigCache = AppriseConfigCache(
settings.APPRISE_CONFIG_DIR, salt=settings.SECRET_KEY,
mode=settings.APPRISE_STATEFUL_MODE)
def apply_global_filters():
#
# Apply Any Global Filters (if identified)
#
if settings.APPRISE_ALLOW_SERVICES:
alphanum_re = re.compile(
r'^(?P<name>[a-z][a-z0-9]+)', re.IGNORECASE)
entries = \
[alphanum_re.match(x).group('name').lower()
for x in re.split(r'[ ,]+', settings.APPRISE_ALLOW_SERVICES)
if alphanum_re.match(x)]
N_MGR.enable_only(*entries)
elif settings.APPRISE_DENY_SERVICES:
alphanum_re = re.compile(
r'^(?P<name>[a-z][a-z0-9]+)', re.IGNORECASE)
entries = \
[alphanum_re.match(x).group('name').lower()
for x in re.split(r'[ ,]+', settings.APPRISE_DENY_SERVICES)
if alphanum_re.match(x)]
N_MGR.disable(*entries)
def gen_unique_config_id():
"""
Generates a unique configuration ID
"""
# our key to use
h = hashlib.sha256()
h.update(datetime.now().strftime('%Y%m%d%H%M%S%f').encode('utf-8'))
h.update(settings.SECRET_KEY.encode('utf-8'))
return h.hexdigest()
def send_webhook(payload):
"""
POST our webhook results
"""
# Prepare HTTP Headers
headers = {
'User-Agent': 'Apprise-API',
'Content-Type': 'application/json',
}
if not apprise.utils.VALID_URL_RE.match(
settings.APPRISE_WEBHOOK_URL):
logger.warning(
'The Apprise Webhook Result URL is not a valid web based URI')
return
# Parse our URL
results = apprise.URLBase.parse_url(settings.APPRISE_WEBHOOK_URL)
if not results:
logger.warning('The Apprise Webhook Result URL is not parseable')
return
if results['schema'] not in ('http', 'https'):
logger.warning(
'The Apprise Webhook Result URL is not using the HTTP protocol')
return
# Load our URL
base = apprise.URLBase(**results)
# Our Query String Dictionary; we use this to track arguments
# specified that aren't otherwise part of this class
params = {k: v for k, v in results.get('qsd', {}).items()
if k not in base.template_args}
try:
requests.post(
base.request_url,
data=dumps(payload),
params=params,
headers=headers,
auth=base.request_auth,
verify=base.verify_certificate,
timeout=base.request_timeout,
)
except requests.RequestException as e:
logger.warning(
'A Connection error occurred sending the Apprise Webhook '
'results to %s.' % base.url(privacy=True))
logger.debug('Socket Exception: %s' % str(e))
return