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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 re
import io
import os
from .ConfigBase import ConfigBase
from ..common import ConfigFormat
from ..common import ContentIncludeMode
from ..AppriseLocale import gettext_lazy as _
class ConfigFile(ConfigBase):
"""
A wrapper for File based configuration sources
"""
# The default descriptive name associated with the service
service_name = _('Local File')
# The default protocol
protocol = 'file'
# Configuration file inclusion can only be of the same type
allow_cross_includes = ContentIncludeMode.STRICT
def __init__(self, path, **kwargs):
"""
Initialize File Object
headers can be a dictionary of key/value pairs that you want to
additionally include as part of the server headers to post with
"""
super(ConfigFile, self).__init__(**kwargs)
# Store our file path as it was set
self.path = os.path.abspath(os.path.expanduser(path))
# Update the config path to be relative to our file we just loaded
self.config_path = os.path.dirname(self.path)
return
def url(self, privacy=False, *args, **kwargs):
"""
Returns the URL built dynamically based on specified arguments.
"""
# Prepare our cache value
if isinstance(self.cache, bool) or not self.cache:
cache = 'yes' if self.cache else 'no'
else:
cache = int(self.cache)
# Define any URL parameters
params = {
'encoding': self.encoding,
'cache': cache,
}
if self.config_format:
# A format was enforced; make sure it's passed back with the url
params['format'] = self.config_format
return 'file://{path}{params}'.format(
path=self.quote(self.path),
params='?{}'.format(self.urlencode(params)) if params else '',
)
def read(self, **kwargs):
"""
Perform retrieval of the configuration based on the specified request
"""
response = None
try:
if self.max_buffer_size > 0 and \
os.path.getsize(self.path) > self.max_buffer_size:
# Content exceeds maximum buffer size
self.logger.error(
'File size exceeds maximum allowable buffer length'
' ({}KB).'.format(int(self.max_buffer_size / 1024)))
return None
except OSError:
# getsize() can throw this acception if the file is missing
# and or simply isn't accessible
self.logger.error(
'File is not accessible: {}'.format(self.path))
return None
# Always call throttle before any server i/o is made
self.throttle()
try:
# Python 3 just supports open(), however to remain compatible with
# Python 2, we use the io module
with io.open(self.path, "rt", encoding=self.encoding) as f:
# Store our content for parsing
response = f.read()
except (ValueError, UnicodeDecodeError):
# A result of our strict encoding check; if we receive this
# then the file we're opening is not something we can
# understand the encoding of..
self.logger.error(
'File not using expected encoding ({}) : {}'.format(
self.encoding, self.path))
return None
except (IOError, OSError):
# IOError is present for backwards compatibility with Python
# versions older then 3.3. >= 3.3 throw OSError now.
# Could not open and/or read the file; this is not a problem since
# we scan a lot of default paths.
self.logger.error(
'File can not be opened for read: {}'.format(self.path))
return None
# Detect config format based on file extension if it isn't already
# enforced
if self.config_format is None and \
re.match(r'^.*\.ya?ml\s*$', self.path, re.I) is not None:
# YAML Filename Detected
self.default_config_format = ConfigFormat.YAML
# Return our response object
return response
@staticmethod
def parse_url(url):
"""
Parses the URL so that we can handle all different file paths
and return it as our path object
"""
results = ConfigBase.parse_url(url, verify_host=False)
if not results:
# We're done early; it's not a good URL
return results
match = re.match(r'[a-z0-9]+://(?P<path>[^?]+)(\?.*)?', url, re.I)
if not match:
return None
results['path'] = ConfigFile.unquote(match.group('path'))
return results
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