Delete attachments with posts

boards/models/post/__init__.py

@@ -1,433 +1,438
 from datetime import datetime, timedelta, date
 from datetime import time as dtime
 import logging
 import re
 import uuid
 
 from django.core.exceptions import ObjectDoesNotExist
 from django.core.urlresolvers import reverse
 from django.db import models, transaction
 from django.db.models import TextField, QuerySet
 from django.template.loader import render_to_string
 from django.utils import timezone
 
 from boards import settings
 from boards.mdx_neboard import Parser
 from boards.models import PostImage, Attachment
 from boards.models.base import Viewable
 from boards import utils
 from boards.models.post.export import get_exporter, DIFF_TYPE_JSON
 from boards.models.user import Notification, Ban
 import boards.models.thread
 
 
 APP_LABEL_BOARDS = 'boards'
 
 POSTS_PER_DAY_RANGE = 7
 
 BAN_REASON_AUTO = 'Auto'
 
 IMAGE_THUMB_SIZE = (200, 150)
 
 TITLE_MAX_LENGTH = 200
 
 # TODO This should be removed
 NO_IP = '0.0.0.0'
 
 REGEX_REPLY = re.compile(r'\[post\](\d+)\[/post\]')
 REGEX_NOTIFICATION = re.compile(r'\[user\](\w+)\[/user\]')
 
 PARAMETER_TRUNCATED = 'truncated'
 PARAMETER_TAG = 'tag'
 PARAMETER_OFFSET = 'offset'
 PARAMETER_DIFF_TYPE = 'type'
 PARAMETER_CSS_CLASS = 'css_class'
 PARAMETER_THREAD = 'thread'
 PARAMETER_IS_OPENING = 'is_opening'
 PARAMETER_MODERATOR = 'moderator'
 PARAMETER_POST = 'post'
 PARAMETER_OP_ID = 'opening_post_id'
 PARAMETER_NEED_OPEN_LINK = 'need_open_link'
 PARAMETER_REPLY_LINK = 'reply_link'
 PARAMETER_NEED_OP_DATA = 'need_op_data'
 
 POST_VIEW_PARAMS = (
     'need_op_data',
     'reply_link',
     'moderator',
     'need_open_link',
     'truncated',
     'mode_tree',
 )
 
 REFMAP_STR = '<a href="{}">&gt;&gt;{}</a>'
 
 IMAGE_TYPES = (
     'jpeg',
     'jpg',
     'png',
     'bmp',
     'gif',
 )
 
 
 class PostManager(models.Manager):
     @transaction.atomic
     def create_post(self, title: str, text: str, file=None, thread=None,
             ip=NO_IP, tags: list=None, opening_posts: list=None):
         """
         Creates new post
         """
 
         is_banned = Ban.objects.filter(ip=ip).exists()
 
         # TODO Raise specific exception and catch it in the views
         if is_banned:
             raise Exception("This user is banned")
 
         if not tags:
             tags = []
         if not opening_posts:
             opening_posts = []
 
         posting_time = timezone.now()
         new_thread = False
         if not thread:
             thread = boards.models.thread.Thread.objects.create(
                 bump_time=posting_time, last_edit_time=posting_time)
             list(map(thread.tags.add, tags))
             boards.models.thread.Thread.objects.process_oldest_threads()
             new_thread = True
 
         pre_text = Parser().preparse(text)
 
         post = self.create(title=title,
                            text=pre_text,
                            pub_time=posting_time,
                            poster_ip=ip,
                            thread=thread,
                            last_edit_time=posting_time)
         post.threads.add(thread)
 
         logger = logging.getLogger('boards.post.create')
 
         logger.info('Created post {} by {}'.format(post, post.poster_ip))
 
         # TODO Move this to other place
         if file:
             file_type = file.name.split('.')[-1].lower()
             if file_type in IMAGE_TYPES:
                 post.images.add(PostImage.objects.create_with_hash(file))
             else:
                 post.attachments.add(Attachment.objects.create_with_hash(file))
 
         post.build_url()
         post.connect_replies()
         post.connect_threads(opening_posts)
         post.connect_notifications()
 
         # Thread needs to be bumped only when the post is already created
         if not new_thread:
             thread.last_edit_time = posting_time
             thread.bump()
             thread.save()
 
         return post
 
     def delete_posts_by_ip(self, ip):
         """
         Deletes all posts of the author with same IP
         """
 
         posts = self.filter(poster_ip=ip)
         for post in posts:
             post.delete()
 
     @utils.cached_result()
     def get_posts_per_day(self) -> float:
         """
         Gets average count of posts per day for the last 7 days
         """
 
         day_end = date.today()
         day_start = day_end - timedelta(POSTS_PER_DAY_RANGE)
 
         day_time_start = timezone.make_aware(datetime.combine(
             day_start, dtime()), timezone.get_current_timezone())
         day_time_end = timezone.make_aware(datetime.combine(
             day_end, dtime()), timezone.get_current_timezone())
 
         posts_per_period = float(self.filter(
             pub_time__lte=day_time_end,
             pub_time__gte=day_time_start).count())
 
         ppd = posts_per_period / POSTS_PER_DAY_RANGE
 
         return ppd
     
 
 class Post(models.Model, Viewable):
     """A post is a message."""
 
     objects = PostManager()
 
     class Meta:
         app_label = APP_LABEL_BOARDS
         ordering = ('id',)
 
     title = models.CharField(max_length=TITLE_MAX_LENGTH, null=True, blank=True)
     pub_time = models.DateTimeField()
     text = TextField(blank=True, null=True)
     _text_rendered = TextField(blank=True, null=True, editable=False)
 
     images = models.ManyToManyField(PostImage, null=True, blank=True,
                                     related_name='post_images', db_index=True)
     attachments = models.ManyToManyField(Attachment, null=True, blank=True,
             related_name='attachment_posts')
 
     poster_ip = models.GenericIPAddressField()
 
     # TODO This field can be removed cause UID is used for update now
     last_edit_time = models.DateTimeField()
 
     referenced_posts = models.ManyToManyField('Post', symmetrical=False,
                                               null=True,
                                               blank=True, related_name='refposts',
                                               db_index=True)
     refmap = models.TextField(null=True, blank=True)
     threads = models.ManyToManyField('Thread', db_index=True)
     thread = models.ForeignKey('Thread', db_index=True, related_name='pt+')
 
     url = models.TextField()
     uid = models.TextField(db_index=True)
 
     def __str__(self):
         return 'P#{}/{}'.format(self.id, self.title)
 
     def get_referenced_posts(self):
         threads = self.get_threads().all()
         return self.referenced_posts.filter(threads__in=threads)\
                 .order_by('pub_time').distinct().all()
 
     def get_title(self) -> str:
         """
         Gets original post title or part of its text.
         """
 
         title = self.title
         if not title:
             title = self.get_text()
 
         return title
 
     def build_refmap(self) -> None:
         """
         Builds a replies map string from replies list. This is a cache to stop
         the server from recalculating the map on every post show.
         """
 
         post_urls = [REFMAP_STR.format(refpost.get_absolute_url(), refpost.id)
                      for refpost in self.referenced_posts.all()]
 
         self.refmap = ', '.join(post_urls)
 
     def is_referenced(self) -> bool:
         return self.refmap and len(self.refmap) > 0
 
     def is_opening(self) -> bool:
         """
         Checks if this is an opening post or just a reply.
         """
 
         return self.get_thread().get_opening_post_id() == self.id
 
     def get_absolute_url(self):
         if self.url:
             return self.url
         else:
             opening_id = self.get_thread().get_opening_post_id()
             post_url = reverse('thread', kwargs={'post_id': opening_id})
             if self.id != opening_id:
                 post_url += '#' + str(self.id)
             return post_url
 
 
     def get_thread(self):
         return self.thread
 
     def get_threads(self) -> QuerySet:
         """
         Gets post's thread.
         """
 
         return self.threads
 
     def get_view(self, *args, **kwargs) -> str:
         """
         Renders post's HTML view. Some of the post params can be passed over
         kwargs for the means of caching (if we view the thread, some params
         are same for every post and don't need to be computed over and over.
         """
 
         thread = self.get_thread()
         is_opening = kwargs.get(PARAMETER_IS_OPENING, self.is_opening())
 
         if is_opening:
             opening_post_id = self.id
         else:
             opening_post_id = thread.get_opening_post_id()
 
         css_class = 'post'
         if thread.archived:
             css_class += ' archive_post'
         elif not thread.can_bump():
             css_class += ' dead_post'
 
         params = dict()
         for param in POST_VIEW_PARAMS:
             if param in kwargs:
                 params[param] = kwargs[param]
 
         params.update({
             PARAMETER_POST: self,
             PARAMETER_IS_OPENING: is_opening,
             PARAMETER_THREAD: thread,
             PARAMETER_CSS_CLASS: css_class,
             PARAMETER_OP_ID: opening_post_id,
         })
 
         return render_to_string('boards/post.html', params)
 
     def get_search_view(self, *args, **kwargs):
         return self.get_view(need_op_data=True, *args, **kwargs)
 
     def get_first_image(self) -> PostImage:
         return self.images.earliest('id')
 
     def delete(self, using=None):
         """
         Deletes all post images and the post itself.
         """
 
         for image in self.images.all():
             image_refs_count = Post.objects.filter(images__in=[image]).count()
             if image_refs_count == 1:
                 image.delete()
 
+        for attachment in self.attachments.all():
+            attachment_refs_count = Post.objects.filter(attachments__in=[attachment]).count()
+            if attachment_refs_count == 1:
+                attachment.delete()
+
         thread = self.get_thread()
         thread.last_edit_time = timezone.now()
         thread.save()
 
         super(Post, self).delete(using)
 
         logging.getLogger('boards.post.delete').info(
             'Deleted post {}'.format(self))
 
     def get_post_data(self, format_type=DIFF_TYPE_JSON, request=None,
                       include_last_update=False) -> str:
         """
         Gets post HTML or JSON data that can be rendered on a page or used by
         API.
         """
 
         return get_exporter(format_type).export(self, request,
                                                 include_last_update)
 
     def notify_clients(self, recursive=True):
         """
         Sends post HTML data to the thread web socket.
         """
 
         if not settings.get_bool('External', 'WebsocketsEnabled'):
             return
 
         thread_ids = list()
         for thread in self.get_threads().all():
             thread_ids.append(thread.id)
 
             thread.notify_clients()
 
         if recursive:
             for reply_number in re.finditer(REGEX_REPLY, self.get_raw_text()):
                 post_id = reply_number.group(1)
 
                 try:
                     ref_post = Post.objects.get(id=post_id)
 
                     if ref_post.get_threads().exclude(id__in=thread_ids).exists():
                         # If post is in this thread, its thread was already notified.
                         # Otherwise, notify its thread separately.
                         ref_post.notify_clients(recursive=False)
                 except ObjectDoesNotExist:
                     pass
 
     def build_url(self):
         self.url = self.get_absolute_url()
         self.save(update_fields=['url'])
 
     def save(self, force_insert=False, force_update=False, using=None,
              update_fields=None):
         self._text_rendered = Parser().parse(self.get_raw_text())
 
         self.uid = str(uuid.uuid4())
         if update_fields is not None and 'uid' not in update_fields:
             update_fields += ['uid']
 
         if self.id:
             for thread in self.get_threads().all():
                 thread.last_edit_time = self.last_edit_time
 
                 thread.save(update_fields=['last_edit_time', 'bumpable'])
 
         super().save(force_insert, force_update, using, update_fields)
 
     def get_text(self) -> str:
         return self._text_rendered
 
     def get_raw_text(self) -> str:
         return self.text
 
     def get_absolute_id(self) -> str:
         """
         If the post has many threads, shows its main thread OP id in the post
         ID.
         """
 
         if self.get_threads().count() > 1:
             return '{}/{}'.format(self.get_thread().get_opening_post_id(), self.id)
         else:
             return str(self.id)
 
     def connect_notifications(self):
         for reply_number in re.finditer(REGEX_NOTIFICATION, self.get_raw_text()):
             user_name = reply_number.group(1).lower()
             Notification.objects.get_or_create(name=user_name, post=self)
 
     def connect_replies(self):
         """
         Connects replies to a post to show them as a reflink map
         """
 
         for reply_number in re.finditer(REGEX_REPLY, self.get_raw_text()):
             post_id = reply_number.group(1)
 
             try:
                 referenced_post = Post.objects.get(id=post_id)
 
                 referenced_post.referenced_posts.add(self)
                 referenced_post.last_edit_time = self.pub_time
                 referenced_post.build_refmap()
                 referenced_post.save(update_fields=['refmap', 'last_edit_time'])
             except ObjectDoesNotExist:
                 pass
 
     def connect_threads(self, opening_posts):
         for opening_post in opening_posts:
             threads = opening_post.get_threads().all()
             for thread in threads:
                 if thread.can_bump():
                     thread.update_bump_status()
 
                 thread.last_edit_time = self.last_edit_time
                 thread.save(update_fields=['last_edit_time', 'bumpable'])
             self.threads.add(opening_post.get_thread())