""" This module contains helper functions and helper classes. """ import hashlib from random import random import time import hmac from django.core.cache import cache from django.db.models import Model from django import forms from django.utils import timezone from django.utils.translation import ugettext_lazy as _ import magic from portage import os import boards from boards.settings import get_bool from neboard import settings CACHE_KEY_DELIMITER = '_' HTTP_FORWARDED = 'HTTP_X_FORWARDED_FOR' META_REMOTE_ADDR = 'REMOTE_ADDR' SETTING_MESSAGES = 'Messages' SETTING_ANON_MODE = 'AnonymousMode' ANON_IP = '127.0.0.1' UPLOAD_DIRS ={ 'PostImage': 'images/', 'Attachment': 'files/', } FILE_EXTENSION_DELIMITER = '.' def is_anonymous_mode(): return get_bool(SETTING_MESSAGES, SETTING_ANON_MODE) def get_client_ip(request): if is_anonymous_mode(): ip = ANON_IP else: x_forwarded_for = request.META.get(HTTP_FORWARDED) if x_forwarded_for: ip = x_forwarded_for.split(',')[-1].strip() else: ip = request.META.get(META_REMOTE_ADDR) return ip # TODO The output format is not epoch because it includes microseconds def datetime_to_epoch(datetime): return int(time.mktime(timezone.localtime( datetime,timezone.get_current_timezone()).timetuple()) * 1000000 + datetime.microsecond) def get_websocket_token(user_id='', timestamp=''): """ Create token to validate information provided by new connection. """ sign = hmac.new(settings.CENTRIFUGE_PROJECT_SECRET.encode()) sign.update(settings.CENTRIFUGE_PROJECT_ID.encode()) sign.update(user_id.encode()) sign.update(timestamp.encode()) token = sign.hexdigest() return token def cached_result(key_method=None): """ Caches method result in the Django's cache system, persisted by object name, object name and model id if object is a Django model. """ def _cached_result(function): def inner_func(obj, *args, **kwargs): # TODO Include method arguments to the cache key cache_key_params = [obj.__class__.__name__, function.__name__] if isinstance(obj, Model): cache_key_params.append(str(obj.id)) if key_method is not None: cache_key_params += [str(arg) for arg in key_method(obj)] cache_key = CACHE_KEY_DELIMITER.join(cache_key_params) persisted_result = cache.get(cache_key) if persisted_result is not None: result = persisted_result else: result = function(obj, *args, **kwargs) cache.set(cache_key, result) return result return inner_func return _cached_result def get_file_hash(file) -> str: md5 = hashlib.md5() for chunk in file.chunks(): md5.update(chunk) return md5.hexdigest() def validate_file_size(size: int): max_size = boards.settings.get_int('Forms', 'MaxFileSize') if size > max_size: raise forms.ValidationError( _('File must be less than %s bytes') % str(max_size)) def get_extension(filename): return filename.split(FILE_EXTENSION_DELIMITER)[-1:][0] def get_upload_filename(model_instance, old_filename): # TODO Use something other than random number in file name extension = get_extension(old_filename) new_name = '{}{}.{}'.format( str(int(time.mktime(time.gmtime()))), str(int(random() * 1000)), extension) directory = UPLOAD_DIRS[type(model_instance).__name__] return os.path.join(directory, new_name) def get_file_mimetype(file) -> str: return magic.from_buffer(file.chunks().__next__(), mime=True).decode()