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"""
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This module contains helper functions and helper classes.
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"""
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import time
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import hmac
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from django.core.cache import cache
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from django.db.models import Model
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from django.utils import timezone
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from neboard import settings
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CACHE_KEY_DELIMITER = '_'
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PERMISSION_MODERATE = 'moderation'
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def get_client_ip(request):
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x_forwarded_for = request.META.get('HTTP_X_FORWARDED_FOR')
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if x_forwarded_for:
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ip = x_forwarded_for.split(',')[-1].strip()
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else:
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ip = request.META.get('REMOTE_ADDR')
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return ip
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# TODO The output format is not epoch because it includes microseconds
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def datetime_to_epoch(datetime):
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return int(time.mktime(timezone.localtime(
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datetime,timezone.get_current_timezone()).timetuple())
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* 1000000 + datetime.microsecond)
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def get_websocket_token(user_id='', timestamp=''):
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"""
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Create token to validate information provided by new connection.
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"""
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sign = hmac.new(settings.CENTRIFUGE_PROJECT_SECRET.encode())
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sign.update(settings.CENTRIFUGE_PROJECT_ID.encode())
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sign.update(user_id.encode())
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sign.update(timestamp.encode())
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token = sign.hexdigest()
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return token
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def cached_result(key_method=None):
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"""
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Caches method result in the Django's cache system, persisted by object name,
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object name and model id if object is a Django model.
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"""
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def _cached_result(function):
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def inner_func(obj, *args, **kwargs):
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# TODO Include method arguments to the cache key
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cache_key_params = [obj.__class__.__name__, function.__name__]
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if isinstance(obj, Model):
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cache_key_params.append(str(obj.id))
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if key_method is not None:
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cache_key_params += [str(arg) for arg in key_method(obj)]
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cache_key = CACHE_KEY_DELIMITER.join(cache_key_params)
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persisted_result = cache.get(cache_key)
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if persisted_result is not None:
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result = persisted_result
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else:
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result = function(obj, *args, **kwargs)
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cache.set(cache_key, result)
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return result
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return inner_func
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return _cached_result
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def is_moderator(request):
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try:
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moderate = request.user.has_perm(PERMISSION_MODERATE)
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except AttributeError:
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moderate = False
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return moderate
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