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from datetime import datetime, timedelta, date
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from datetime import time as dtime
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import os
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from random import random
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import time
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import re
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import hashlib
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from django.core.cache import cache
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from django.core.urlresolvers import reverse
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from django.db import models, transaction
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from django.utils import timezone
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from markupfield.fields import MarkupField
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from neboard import settings
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from boards import thumbs
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APP_LABEL_BOARDS = 'boards'
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CACHE_KEY_PPD = 'ppd'
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CACHE_KEY_POST_URL = 'post_url'
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CACHE_KEY_OPENING_POST = 'opening_post_id'
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POSTS_PER_DAY_RANGE = range(7)
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BAN_REASON_AUTO = 'Auto'
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IMAGE_THUMB_SIZE = (200, 150)
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TITLE_MAX_LENGTH = 200
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DEFAULT_MARKUP_TYPE = 'markdown'
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NO_PARENT = -1
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NO_IP = '0.0.0.0'
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UNKNOWN_UA = ''
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ALL_PAGES = -1
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IMAGES_DIRECTORY = 'images/'
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FILE_EXTENSION_DELIMITER = '.'
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SETTING_MODERATE = "moderate"
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REGEX_REPLY = re.compile('>>(\d+)')
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class PostManager(models.Manager):
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def create_post(self, title, text, image=None, thread=None,
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ip=NO_IP, tags=None, user=None):
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"""
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Creates new post
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"""
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posting_time = timezone.now()
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if not thread:
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thread = Thread.objects.create(bump_time=posting_time,
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last_edit_time=posting_time)
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new_thread = True
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else:
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thread.bump()
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thread.last_edit_time = posting_time
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thread.save()
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new_thread = False
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post = self.create(title=title,
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text=text,
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pub_time=posting_time,
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thread_new=thread,
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image=image,
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poster_ip=ip,
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poster_user_agent=UNKNOWN_UA, # TODO Get UA at
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# last!
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last_edit_time=posting_time,
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user=user)
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thread.replies.add(post)
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if tags:
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linked_tags = []
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for tag in tags:
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tag_linked_tags = tag.get_linked_tags()
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if len(tag_linked_tags) > 0:
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linked_tags.extend(tag_linked_tags)
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tags.extend(linked_tags)
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map(thread.add_tag, tags)
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if new_thread:
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self._delete_old_threads()
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self.connect_replies(post)
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return post
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def delete_post(self, post):
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"""
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Deletes post and update or delete its thread
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"""
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thread = post.get_thread()
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if post.is_opening():
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thread.delete_with_posts()
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else:
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thread.last_edit_time = timezone.now()
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thread.save()
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post.delete()
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def delete_posts_by_ip(self, ip):
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"""
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Deletes all posts of the author with same IP
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"""
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posts = self.filter(poster_ip=ip)
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map(self.delete_post, posts)
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# TODO Move this method to thread manager
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def _delete_old_threads(self):
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"""
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Preserves maximum thread count. If there are too many threads,
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archive the old ones.
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"""
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threads = Thread.objects.filter(archived=False).order_by('-bump_time')
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thread_count = threads.count()
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if thread_count > settings.MAX_THREAD_COUNT:
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num_threads_to_delete = thread_count - settings.MAX_THREAD_COUNT
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old_threads = threads[thread_count - num_threads_to_delete:]
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for thread in old_threads:
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thread.archived = True
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thread.last_edit_time = timezone.now()
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thread.save()
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def connect_replies(self, post):
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"""
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Connects replies to a post to show them as a reflink map
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"""
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for reply_number in re.finditer(REGEX_REPLY, post.text.raw):
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post_id = reply_number.group(1)
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ref_post = self.filter(id=post_id)
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if ref_post.count() > 0:
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referenced_post = ref_post[0]
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referenced_post.referenced_posts.add(post)
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referenced_post.last_edit_time = post.pub_time
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referenced_post.save()
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referenced_thread = referenced_post.get_thread()
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referenced_thread.last_edit_time = post.pub_time
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referenced_thread.save()
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def get_posts_per_day(self):
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"""
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Gets average count of posts per day for the last 7 days
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"""
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today = date.today()
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ppd = cache.get(CACHE_KEY_PPD + str(today))
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if ppd:
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return ppd
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posts_per_days = []
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for i in POSTS_PER_DAY_RANGE:
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day_end = today - timedelta(i + 1)
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day_start = today - timedelta(i + 2)
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day_time_start = timezone.make_aware(datetime.combine(
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day_start, dtime()), timezone.get_current_timezone())
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day_time_end = timezone.make_aware(datetime.combine(
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day_end, dtime()), timezone.get_current_timezone())
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posts_per_days.append(float(self.filter(
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pub_time__lte=day_time_end,
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pub_time__gte=day_time_start).count()))
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ppd = (sum(posts_per_day for posts_per_day in posts_per_days) /
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len(posts_per_days))
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cache.set(CACHE_KEY_PPD + str(today), ppd)
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return ppd
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class Post(models.Model):
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"""A post is a message."""
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objects = PostManager()
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class Meta:
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app_label = APP_LABEL_BOARDS
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# TODO Save original file name to some field
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def _update_image_filename(self, filename):
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"""
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Gets unique image filename
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"""
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path = IMAGES_DIRECTORY
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new_name = str(int(time.mktime(time.gmtime())))
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new_name += str(int(random() * 1000))
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new_name += FILE_EXTENSION_DELIMITER
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new_name += filename.split(FILE_EXTENSION_DELIMITER)[-1:][0]
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return os.path.join(path, new_name)
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title = models.CharField(max_length=TITLE_MAX_LENGTH)
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pub_time = models.DateTimeField()
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text = MarkupField(default_markup_type=DEFAULT_MARKUP_TYPE,
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escape_html=False)
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image_width = models.IntegerField(default=0)
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image_height = models.IntegerField(default=0)
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image_pre_width = models.IntegerField(default=0)
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image_pre_height = models.IntegerField(default=0)
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image = thumbs.ImageWithThumbsField(upload_to=_update_image_filename,
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blank=True, sizes=(IMAGE_THUMB_SIZE,),
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width_field='image_width',
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height_field='image_height',
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preview_width_field='image_pre_width',
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preview_height_field='image_pre_height')
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image_hash = models.CharField(max_length=36)
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poster_ip = models.GenericIPAddressField()
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poster_user_agent = models.TextField()
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thread = models.ForeignKey('Post', null=True, default=None)
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thread_new = models.ForeignKey('Thread', null=True, default=None)
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last_edit_time = models.DateTimeField()
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user = models.ForeignKey('User', null=True, default=None)
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referenced_posts = models.ManyToManyField('Post', symmetrical=False,
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null=True,
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blank=True, related_name='rfp+')
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def __unicode__(self):
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return '#' + str(self.id) + ' ' + self.title + ' (' + \
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self.text.raw[:50] + ')'
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def get_title(self):
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"""
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Gets original post title or part of its text.
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"""
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title = self.title
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if not title:
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title = self.text.rendered
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return title
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def get_sorted_referenced_posts(self):
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return self.referenced_posts.order_by('id')
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def is_referenced(self):
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return self.referenced_posts.exists()
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def is_opening(self):
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"""
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Checks if this is an opening post or just a reply.
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"""
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return self.get_thread().get_opening_post_id() == self.id
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def save(self, *args, **kwargs):
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"""
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Saves the model and computes the image hash for deduplication purposes.
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"""
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if not self.pk and self.image:
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md5 = hashlib.md5()
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for chunk in self.image.chunks():
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md5.update(chunk)
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self.image_hash = md5.hexdigest()
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super(Post, self).save(*args, **kwargs)
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@transaction.atomic
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def add_tag(self, tag):
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edit_time = timezone.now()
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thread = self.get_thread()
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thread.add_tag(tag)
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self.last_edit_time = edit_time
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self.save()
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thread.last_edit_time = edit_time
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thread.save()
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@transaction.atomic
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def remove_tag(self, tag):
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edit_time = timezone.now()
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thread = self.get_thread()
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thread.remove_tag(tag)
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self.last_edit_time = edit_time
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self.save()
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thread.last_edit_time = edit_time
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thread.save()
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def get_url(self):
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"""
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Gets full url to the post.
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"""
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cache_key = CACHE_KEY_POST_URL + str(self.id)
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link = cache.get(cache_key)
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if not link:
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opening_id = self.get_thread().get_opening_post_id()
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if self.id != opening_id:
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link = reverse('thread', kwargs={
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'post_id': opening_id}) + '#' + str(self.id)
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else:
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link = reverse('thread', kwargs={'post_id': self.id})
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cache.set(cache_key, link)
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return link
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def get_thread(self):
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"""
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Gets post's thread.
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"""
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return self.thread_new
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class Thread(models.Model):
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class Meta:
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app_label = APP_LABEL_BOARDS
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tags = models.ManyToManyField('Tag')
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bump_time = models.DateTimeField()
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last_edit_time = models.DateTimeField()
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replies = models.ManyToManyField('Post', symmetrical=False, null=True,
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blank=True, related_name='tre+')
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archived = models.BooleanField(default=False)
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def get_tags(self):
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"""
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Gets a sorted tag list.
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"""
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return self.tags.order_by('name')
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def bump(self):
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"""
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Bumps (moves to up) thread if possible.
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"""
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if self.can_bump():
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self.bump_time = timezone.now()
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def get_reply_count(self):
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return self.replies.count()
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def get_images_count(self):
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return self.replies.filter(image_width__gt=0).count()
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def can_bump(self):
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"""
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Checks if the thread can be bumped by replying to it.
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"""
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if self.archived:
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return False
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post_count = self.get_reply_count()
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return post_count < settings.MAX_POSTS_PER_THREAD
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def delete_with_posts(self):
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"""
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Completely deletes thread and all its posts
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"""
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if self.replies.exists():
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self.replies.all().delete()
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self.delete()
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def get_last_replies(self):
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"""
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Gets several last replies, not including opening post
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"""
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if settings.LAST_REPLIES_COUNT > 0:
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reply_count = self.get_reply_count()
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if reply_count > 0:
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reply_count_to_show = min(settings.LAST_REPLIES_COUNT,
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reply_count - 1)
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last_replies = self.replies.order_by(
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'pub_time')[reply_count - reply_count_to_show:]
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return last_replies
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def get_skipped_replies_count(self):
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"""
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Gets number of posts between opening post and last replies.
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"""
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last_replies = self.get_last_replies()
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return self.get_reply_count() - len(last_replies) - 1
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def get_replies(self):
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"""
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Gets sorted thread posts
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"""
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return self.replies.all().order_by('pub_time')
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def add_tag(self, tag):
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"""
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Connects thread to a tag and tag to a thread
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"""
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self.tags.add(tag)
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tag.threads.add(self)
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def remove_tag(self, tag):
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self.tags.remove(tag)
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tag.threads.remove(self)
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def get_opening_post(self):
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"""
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Gets the first post of the thread
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"""
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opening_post = self.get_replies()[0]
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return opening_post
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def get_opening_post_id(self):
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"""
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Gets ID of the first thread post.
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"""
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cache_key = CACHE_KEY_OPENING_POST + str(self.id)
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opening_post_id = cache.get(cache_key)
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if not opening_post_id:
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opening_post_id = self.get_opening_post().id
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cache.set(cache_key, opening_post_id)
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return opening_post_id
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def __unicode__(self):
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return str(self.id)
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def get_pub_time(self):
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"""
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Gets opening post's pub time because thread does not have its own one.
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"""
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return self.get_opening_post().pub_time
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