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0bin/zerobin/utils.py

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# coding: utf-8
from __future__ import print_function, unicode_literals, absolute_import
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import time
import os
import glob
import tempfile
import sys
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import codecs
import unicodedata
from functools import partial
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from zerobin import default_settings
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sys.path.append(default_settings.LIBS_DIR)
try:
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from zerobin.privilege import drop_privileges_permanently, coerce_user, coerce_group
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except (AttributeError):
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pass # privilege does't work on several plateform
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try:
from runpy import run_path
except ImportError:
# python-2.6 or earlier - use simplier less-optimized execfile()
def run_path(file_path):
mod_globals = {'__file__': file_path}
execfile(file_path, mod_globals)
return mod_globals
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def drop_privileges(user=None, group=None, wait=5):
"""
Try to set the process user and group to another one.
If no group is provided, it's set to the same as the user.
You can wait for a certain time before doing so.
"""
if wait:
time.sleep(wait)
if user:
group = group or user
try:
user = coerce_user(user)
group = coerce_group(group)
lock_files = glob.glob(os.path.join(tempfile.gettempdir(),
'bottle.*.lock'))
for lock_file in lock_files:
os.chown(lock_file, user, group)
drop_privileges_permanently(user, group, ())
except Exception:
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print("Failed to drop privileges. Running with current user.")
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def dmerge(*args):
"""
Return new directionay being the sum of all merged dictionaries passed
as arguments
"""
dictionary = {}
for arg in args:
dictionary.update(arg)
return dictionary
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class SettingsValidationError(Exception):
pass
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class SettingsContainer(object):
"""
Singleton containing the settings for the whole app
"""
_instance = None
def __new__(cls, *args, **kwargs):
if not cls._instance:
cls._instance = super(SettingsContainer, cls).__new__(cls, *args,
**kwargs)
cls._instance.update_with_module(default_settings)
return cls._instance
def update_with_dict(self, dict):
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"""
Update settings with values from the given mapping object.
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(Taking only variable with uppercased name)
"""
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for name, value in dict.items():
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if name.isupper():
setattr(self, name, value)
return self
def update_with_module(self, module):
"""
Update settings with values from the given module.
Uses update_with_dict() behind the scenes.
"""
return self.update_with_dict(module.__dict__)
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@classmethod
def from_module(cls, module):
"""
Create an instance of SettingsContainer with values based
on the one in the passed module.
"""
settings = cls()
settings.update_with_module(module)
return settings
def update_with_file(self, filepath):
"""
Update settings with values from the given module file.
Uses update_with_dict() behind the scenes.
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"""
settings = run_path(filepath)
return self.update_with_dict(settings)
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settings = SettingsContainer()
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def to_ascii(utext):
""" Take a unicode string and return ascii bytes.
Try to replace non ASCII char by similar ASCII char. If it can't,
replace it with "?".
"""
return unicodedata.normalize('NFKD', utext).encode('ascii', "replace")
# Make sure to always specify encoding when using open in Python 2 or 3
safe_open = partial(codecs.open, encoding="utf8")
def as_unicode(obj):
""" Return the unicode representation of an object """
try:
return unicode(obj)
except NameError:
return str(obj)