Extend PoW lifetime to 5 mins

boards/forms.py

@@ -1,443 +1,443 b''
 import hashlib
 import re
 import time
 import logging
 
 import pytz
 
 from django import forms
 from django.core.files.uploadedfile import SimpleUploadedFile
 from django.core.exceptions import ObjectDoesNotExist
 from django.forms.util import ErrorList
 from django.utils.translation import ugettext_lazy as _, ungettext_lazy
 from django.utils import timezone
 
 from boards.mdx_neboard import formatters
 from boards.models.attachment.downloaders import Downloader
 from boards.models.post import TITLE_MAX_LENGTH
 from boards.models import Tag, Post
 from boards.utils import validate_file_size, get_file_mimetype, \
     FILE_EXTENSION_DELIMITER
 from neboard import settings
 import boards.settings as board_settings
 import neboard
 
 POW_HASH_LENGTH = 16
-POW_LIFE_MINUTES = 1
+POW_LIFE_MINUTES = 5
 
 REGEX_TAGS = re.compile(r'^[\w\s\d]+$', re.UNICODE)
 REGEX_USERNAMES = re.compile(r'^[\w\s\d,]+$', re.UNICODE)
 
 VETERAN_POSTING_DELAY = 5
 
 ATTRIBUTE_PLACEHOLDER = 'placeholder'
 ATTRIBUTE_ROWS = 'rows'
 
 LAST_POST_TIME = 'last_post_time'
 LAST_LOGIN_TIME = 'last_login_time'
 TEXT_PLACEHOLDER = _('Type message here. Use formatting panel for more advanced usage.')
 TAGS_PLACEHOLDER = _('music images i_dont_like_tags')
 
 LABEL_TITLE = _('Title')
 LABEL_TEXT = _('Text')
 LABEL_TAG = _('Tag')
 LABEL_SEARCH = _('Search')
 
 ERROR_SPEED = 'Please wait %(delay)d second before sending message'
 ERROR_SPEED_PLURAL = 'Please wait %(delay)d seconds before sending message'
 
 TAG_MAX_LENGTH = 20
 
 TEXTAREA_ROWS = 4
 
 TRIPCODE_DELIM = '#'
 
 # TODO Maybe this may be converted into the database table?
 MIMETYPE_EXTENSIONS = {
     'image/jpeg': 'jpeg',
     'image/png': 'png',
     'image/gif': 'gif',
     'video/webm': 'webm',
     'application/pdf': 'pdf',
     'x-diff': 'diff',
     'image/svg+xml': 'svg',
     'application/x-shockwave-flash': 'swf',
 }
 
 
 def get_timezones():
     timezones = []
     for tz in pytz.common_timezones:
         timezones.append((tz, tz),)
     return timezones
 
 
 class FormatPanel(forms.Textarea):
     """
     Panel for text formatting. Consists of buttons to add different tags to the
     form text area.
     """
 
     def render(self, name, value, attrs=None):
         output = '<div id="mark-panel">'
         for formatter in formatters:
             output += '<span class="mark_btn"' + \
                       ' onClick="addMarkToMsg(\'' + formatter.format_left + \
                       '\', \'' + formatter.format_right + '\')">' + \
                       formatter.preview_left + formatter.name + \
                       formatter.preview_right + '</span>'
 
         output += '</div>'
         output += super(FormatPanel, self).render(name, value, attrs=attrs)
 
         return output
 
 
 class PlainErrorList(ErrorList):
     def __unicode__(self):
         return self.as_text()
 
     def as_text(self):
         return ''.join(['(!) %s ' % e for e in self])
 
 
 class NeboardForm(forms.Form):
     """
     Form with neboard-specific formatting.
     """
 
     def as_div(self):
         """
         Returns this form rendered as HTML <as_div>s.
         """
 
         return self._html_output(
             # TODO Do not show hidden rows in the list here
             normal_row='<div class="form-row">'
                        '<div class="form-label">'
                        '%(label)s'
                        '</div>'
                        '<div class="form-input">'
                        '%(field)s'
                        '</div>'
                        '</div>'
                        '<div class="form-row">'
                        '%(help_text)s'
                        '</div>',
             error_row='<div class="form-row">'
                       '<div class="form-label"></div>'
                       '<div class="form-errors">%s</div>'
                       '</div>',
             row_ender='</div>',
             help_text_html='%s',
             errors_on_separate_row=True)
 
     def as_json_errors(self):
         errors = []
 
         for name, field in list(self.fields.items()):
             if self[name].errors:
                 errors.append({
                     'field': name,
                     'errors': self[name].errors.as_text(),
                 })
 
         return errors
 
 
 class PostForm(NeboardForm):
 
     title = forms.CharField(max_length=TITLE_MAX_LENGTH, required=False,
                             label=LABEL_TITLE,
                             widget=forms.TextInput(
                                 attrs={ATTRIBUTE_PLACEHOLDER:
                                            'test#tripcode'}))
     text = forms.CharField(
         widget=FormatPanel(attrs={
             ATTRIBUTE_PLACEHOLDER: TEXT_PLACEHOLDER,
             ATTRIBUTE_ROWS: TEXTAREA_ROWS,
         }),
         required=False, label=LABEL_TEXT)
     file = forms.FileField(required=False, label=_('File'),
                              widget=forms.ClearableFileInput(
                                  attrs={'accept': 'file/*'}))
     file_url = forms.CharField(required=False, label=_('File URL'),
                                 widget=forms.TextInput(
                                     attrs={ATTRIBUTE_PLACEHOLDER:
                                                'http://example.com/image.png'}))
 
     # This field is for spam prevention only
     email = forms.CharField(max_length=100, required=False, label=_('e-mail'),
                             widget=forms.TextInput(attrs={
                                 'class': 'form-email'}))
     threads = forms.CharField(required=False, label=_('Additional threads'),
             widget=forms.TextInput(attrs={ATTRIBUTE_PLACEHOLDER:
                 '123 456 789'}))
 
     guess = forms.CharField(widget=forms.HiddenInput(), required=False)
     timestamp = forms.CharField(widget=forms.HiddenInput(), required=False)
     iteration = forms.CharField(widget=forms.HiddenInput(), required=False)
 
     session = None
     need_to_ban = False
 
     def _update_file_extension(self, file):
         if file:
             mimetype = get_file_mimetype(file)
             extension = MIMETYPE_EXTENSIONS.get(mimetype)
             if extension:
                 filename = file.name.split(FILE_EXTENSION_DELIMITER, 1)[0]
                 new_filename = filename + FILE_EXTENSION_DELIMITER + extension
 
                 file.name = new_filename
             else:
                 logger = logging.getLogger('boards.forms.extension')
 
                 logger.info('Unrecognized file mimetype: {}'.format(mimetype))
 
     def clean_title(self):
         title = self.cleaned_data['title']
         if title:
             if len(title) > TITLE_MAX_LENGTH:
                 raise forms.ValidationError(_('Title must have less than %s '
                                               'characters') %
                                             str(TITLE_MAX_LENGTH))
         return title
 
     def clean_text(self):
         text = self.cleaned_data['text'].strip()
         if text:
             max_length = board_settings.get_int('Forms', 'MaxTextLength')
             if len(text) > max_length:
                 raise forms.ValidationError(_('Text must have less than %s '
                                               'characters') % str(max_length))
         return text
 
     def clean_file(self):
         file = self.cleaned_data['file']
 
         if file:
             validate_file_size(file.size)
         self._update_file_extension(file)
 
         return file
 
     def clean_file_url(self):
         url = self.cleaned_data['file_url']
 
         file = None
         if url:
             file = self._get_file_from_url(url)
 
             if not file:
                 raise forms.ValidationError(_('Invalid URL'))
             else:
                 validate_file_size(file.size)
         self._update_file_extension(file)
 
         return file
 
     def clean_threads(self):
         threads_str = self.cleaned_data['threads']
 
         if len(threads_str) > 0:
             threads_id_list = threads_str.split(' ')
 
             threads = list()
 
             for thread_id in threads_id_list:
                 try:
                     thread = Post.objects.get(id=int(thread_id))
                     if not thread.is_opening() or thread.get_thread().is_archived():
                         raise ObjectDoesNotExist()
                     threads.append(thread)
                 except (ObjectDoesNotExist, ValueError):
                     raise forms.ValidationError(_('Invalid additional thread list'))
 
             return threads
 
     def clean(self):
         cleaned_data = super(PostForm, self).clean()
 
         if cleaned_data['email']:
             self.need_to_ban = True
             raise forms.ValidationError('A human cannot enter a hidden field')
 
         if not self.errors:
             self._clean_text_file()
 
         limit_speed = board_settings.get_bool('Forms', 'LimitPostingSpeed')
         if not self.errors and limit_speed:
             pow_difficulty = board_settings.get_int('Forms', 'PowDifficulty')
             if pow_difficulty > 0 and cleaned_data['timestamp'] and cleaned_data['iteration'] and cleaned_data['guess']:
                 self._validate_hash(cleaned_data['timestamp'], cleaned_data['iteration'], cleaned_data['guess'], cleaned_data['text'])
             else:
                 self._validate_posting_speed()
 
         return cleaned_data
 
     def get_file(self):
         """
         Gets file from form or URL.
         """
 
         file = self.cleaned_data['file']
         return file or self.cleaned_data['file_url']
 
     def get_tripcode(self):
         title = self.cleaned_data['title']
         if title is not None and TRIPCODE_DELIM in title:
             code = title.split(TRIPCODE_DELIM, maxsplit=1)[1] + neboard.settings.SECRET_KEY
             tripcode = hashlib.md5(code.encode()).hexdigest()
         else:
             tripcode = ''
         return tripcode
 
     def get_title(self):
         title = self.cleaned_data['title']
         if title is not None and TRIPCODE_DELIM in title:
             return title.split(TRIPCODE_DELIM, maxsplit=1)[0]
         else:
             return title
 
     def _clean_text_file(self):
         text = self.cleaned_data.get('text')
         file = self.get_file()
 
         if (not text) and (not file):
             error_message = _('Either text or file must be entered.')
             self._errors['text'] = self.error_class([error_message])
 
     def _validate_posting_speed(self):
         can_post = True
 
         posting_delay = settings.POSTING_DELAY
 
         if board_settings.get_bool('Forms', 'LimitPostingSpeed'):
             now = time.time()
 
             current_delay = 0
 
             if LAST_POST_TIME not in self.session:
                 self.session[LAST_POST_TIME] = now
 
                 need_delay = True
             else:
                 last_post_time = self.session.get(LAST_POST_TIME)
                 current_delay = int(now - last_post_time)
 
                 need_delay = current_delay < posting_delay
 
             if need_delay:
                 delay = posting_delay - current_delay
                 error_message = ungettext_lazy(ERROR_SPEED, ERROR_SPEED_PLURAL,
                                                delay) % {'delay': delay}
                 self._errors['text'] = self.error_class([error_message])
 
                 can_post = False
 
             if can_post:
                 self.session[LAST_POST_TIME] = now
 
     def _get_file_from_url(self, url: str) -> SimpleUploadedFile:
         """
         Gets an file file from URL.
         """
 
         img_temp = None
 
         try:
             for downloader in Downloader.__subclasses__():
                 if downloader.handles(url):
                     return downloader.download(url)
             # If nobody of the specific downloaders handles this, use generic
             # one
             return Downloader.download(url)
         except forms.ValidationError as e:
             raise e
         except Exception as e:
             raise forms.ValidationError(e)
 
     def _validate_hash(self, timestamp: str, iteration: str, guess: str, message: str):
         post_time = timezone.datetime.fromtimestamp(
             int(timestamp[:-3]), tz=timezone.get_current_timezone())
         timedelta = (timezone.now() - post_time).seconds / 60
         if timedelta > POW_LIFE_MINUTES:
             self._errors['text'] = self.error_class([_('Stale PoW.')])
 
         payload = timestamp + message.replace('\r\n', '\n')
         difficulty = board_settings.get_int('Forms', 'PowDifficulty')
         target = str(int(2 ** (POW_HASH_LENGTH * 3) / difficulty))
         if len(target) < POW_HASH_LENGTH:
             target = '0' * (POW_HASH_LENGTH - len(target)) + target
 
         computed_guess = hashlib.sha256((payload + iteration).encode())\
                              .hexdigest()[0:POW_HASH_LENGTH]
         if guess != computed_guess or guess > target:
             self._errors['text'] = self.error_class(
                 [_('Invalid PoW.')])
 
 
 class ThreadForm(PostForm):
 
     tags = forms.CharField(
         widget=forms.TextInput(attrs={ATTRIBUTE_PLACEHOLDER: TAGS_PLACEHOLDER}),
         max_length=100, label=_('Tags'), required=True)
     monochrome = forms.BooleanField(label=_('Monochrome'), required=False)
 
     def clean_tags(self):
         tags = self.cleaned_data['tags'].strip()
 
         if not tags or not REGEX_TAGS.match(tags):
             raise forms.ValidationError(
                 _('Inappropriate characters in tags.'))
 
         required_tag_exists = False
         tag_set = set()
         for tag_string in tags.split():
             tag, created = Tag.objects.get_or_create(name=tag_string.strip().lower())
             tag_set.add(tag)
 
             # If this is a new tag, don't check for its parents because nobody
             # added them yet
             if not created:
                 tag_set |= set(tag.get_all_parents())
 
         for tag in tag_set:
             if tag.required:
                 required_tag_exists = True
                 break
 
         if not required_tag_exists:
             raise forms.ValidationError(
                 _('Need at least one section.'))
 
         return tag_set
 
     def clean(self):
         cleaned_data = super(ThreadForm, self).clean()
 
         return cleaned_data
 
     def is_monochrome(self):
         return self.cleaned_data['monochrome']
 
 
 class SettingsForm(NeboardForm):
 
     theme = forms.ChoiceField(choices=settings.THEMES, label=_('Theme'))
     image_viewer = forms.ChoiceField(choices=settings.IMAGE_VIEWERS, label=_('Image view mode'))
     username = forms.CharField(label=_('User name'), required=False)
     timezone = forms.ChoiceField(choices=get_timezones(), label=_('Time zone'))
 
     def clean_username(self):
         username = self.cleaned_data['username']
 
         if username and not REGEX_USERNAMES.match(username):
             raise forms.ValidationError(_('Inappropriate characters.'))
 
         return username
 
 
 class SearchForm(NeboardForm):
     query = forms.CharField(max_length=500, label=LABEL_SEARCH, required=False)