boards/models/post.py

import os
from random import random
import time
import math
import re

from django.db import models
from django.http import Http404
from django.utils import timezone
from markupfield.fields import MarkupField

from neboard import settings
from boards import settings as boards_settings
from boards import thumbs

BAN_REASON_AUTO = 'Auto'

IMAGE_THUMB_SIZE = (200, 150)

TITLE_MAX_LENGTH = 50

DEFAULT_MARKUP_TYPE = 'markdown'

NO_PARENT = -1
NO_IP = '0.0.0.0'
UNKNOWN_UA = ''
ALL_PAGES = -1
IMAGES_DIRECTORY = 'images/'
FILE_EXTENSION_DELIMITER = '.'

SETTING_MODERATE = "moderate"

REGEX_REPLY = re.compile('>>(\d+)')


class PostManager(models.Manager):

    def create_post(self, title, text, image=None, thread=None,
                    ip=NO_IP, tags=None, user=None):
        posting_time = timezone.now()

        post = self.create(title=title,
                           text=text,
                           pub_time=posting_time,
                           thread=thread,
                           image=image,
                           poster_ip=ip,
                           poster_user_agent=UNKNOWN_UA,
                           last_edit_time=posting_time,
                           bump_time=posting_time,
                           user=user)

        if tags:
            linked_tags = []
            for tag in tags:
                tag_linked_tags = tag.get_linked_tags()
                if len(tag_linked_tags) > 0:
                    linked_tags.extend(tag_linked_tags)

            tags.extend(linked_tags)
            map(post.tags.add, tags)
            for tag in tags:
                tag.threads.add(post)

        if thread:
            thread.replies.add(post)
            thread.bump()
            thread.last_edit_time = posting_time
            thread.save()
        else:
            self._delete_old_threads()

        self.connect_replies(post)

        return post

    def delete_post(self, post):
        if post.replies.count() > 0:
            map(self.delete_post, post.replies.all())

        # Update thread's last edit time
        thread = post.thread
        if thread:
            thread.last_edit_time = timezone.now()
            thread.save()

        post.delete()

    def delete_posts_by_ip(self, ip):
        posts = self.filter(poster_ip=ip)
        map(self.delete_post, posts)

    def get_threads(self, tag=None, page=ALL_PAGES,
                    order_by='-bump_time'):
        if tag:
            threads = tag.threads

            if threads.count() == 0:
                raise Http404
        else:
            threads = self.filter(thread=None)

        threads = threads.order_by(order_by)

        if page != ALL_PAGES:
            thread_count = threads.count()

            if page < self._get_page_count(thread_count):
                start_thread = page * settings.THREADS_PER_PAGE
                end_thread = min(start_thread + settings.THREADS_PER_PAGE,
                                 thread_count)
                threads = threads[start_thread:end_thread]

        return threads

    def get_thread(self, opening_post_id):
        try:
            opening_post = self.get(id=opening_post_id, thread=None)
        except Post.DoesNotExist:
            raise Http404

        if opening_post.replies:
            thread = [opening_post]
            thread.extend(opening_post.replies.all().order_by('pub_time'))

            return thread

    def get_thread_page_count(self, tag=None):
        if tag:
            threads = self.filter(thread=None, tags=tag)
        else:
            threads = self.filter(thread=None)

        return self._get_page_count(threads.count())

    def _delete_old_threads(self):
        """
        Preserves maximum thread count. If there are too many threads,
        delete the old ones.
        """

        # TODO Move old threads to the archive instead of deleting them.
        # Maybe make some 'old' field in the model to indicate the thread
        # must not be shown and be able for replying.

        threads = self.get_threads()
        thread_count = threads.count()

        if thread_count > settings.MAX_THREAD_COUNT:
            num_threads_to_delete = thread_count - settings.MAX_THREAD_COUNT
            old_threads = threads[thread_count - num_threads_to_delete:]

            map(self.delete_post, old_threads)

    def connect_replies(self, post):
        """Connect replies to a post to show them as a refmap"""

        for reply_number in re.finditer(REGEX_REPLY, post.text.raw):
            post_id = reply_number.group(1)
            ref_post = self.filter(id=post_id)
            if ref_post.count() > 0:
                referenced_post = ref_post[0]
                referenced_post.referenced_posts.add(post)
                referenced_post.last_edit_time = post.pub_time
                referenced_post.save()

    def _get_page_count(self, thread_count):
        return int(math.ceil(thread_count / float(settings.THREADS_PER_PAGE)))


class Post(models.Model):
    """A post is a message."""

    objects = PostManager()

    class Meta:
        app_label = 'boards'

    def _update_image_filename(self, filename):
        """Get unique image filename"""

        path = IMAGES_DIRECTORY
        new_name = str(int(time.mktime(time.gmtime())))
        new_name += str(int(random() * 1000))
        new_name += FILE_EXTENSION_DELIMITER
        new_name += filename.split(FILE_EXTENSION_DELIMITER)[-1:][0]

        return os.path.join(path, new_name)

    title = models.CharField(max_length=TITLE_MAX_LENGTH)
    pub_time = models.DateTimeField()
    text = MarkupField(default_markup_type=DEFAULT_MARKUP_TYPE,
                       escape_html=False)

    image_width = models.IntegerField(default=0)
    image_height = models.IntegerField(default=0)

    image = thumbs.ImageWithThumbsField(upload_to=_update_image_filename,
                                        blank=True, sizes=(IMAGE_THUMB_SIZE,),
                                        width_field='image_width',
                                        height_field='image_height')

    poster_ip = models.GenericIPAddressField()
    poster_user_agent = models.TextField()

    thread = models.ForeignKey('Post', null=True, default=None)
    tags = models.ManyToManyField('Tag')
    last_edit_time = models.DateTimeField()
    bump_time = models.DateTimeField()
    user = models.ForeignKey('User', null=True, default=None)

    replies = models.ManyToManyField('Post', symmetrical=False, null=True,
                                     blank=True, related_name='re+')
    referenced_posts = models.ManyToManyField('Post', symmetrical=False,
                                              null=True,
                                              blank=True, related_name='rfp+')

    def __unicode__(self):
        return '#' + str(self.id) + ' ' + self.title + ' (' + \
               self.text.raw[:50] + ')'

    def get_title(self):
        title = self.title
        if len(title) == 0:
            title = self.text.raw[:20]

        return title

    def get_reply_count(self):
        return self.replies.count()

    def get_images_count(self):
        images_count = 1 if self.image else 0
        images_count += self.replies.filter(image_width__gt=0).count()

        return images_count

    def can_bump(self):
        """Check if the thread can be bumped by replying"""

        post_count = self.get_reply_count()

        return post_count <= settings.MAX_POSTS_PER_THREAD

    def bump(self):
        """Bump (move to up) thread"""

        if self.can_bump():
            self.bump_time = timezone.now()

    def get_last_replies(self):
        if settings.LAST_REPLIES_COUNT > 0:
            reply_count = self.get_reply_count()

            if reply_count > 0:
                reply_count_to_show = min(settings.LAST_REPLIES_COUNT,
                                          reply_count)
                last_replies = self.replies.all().order_by('pub_time')[
                               reply_count - reply_count_to_show:]

                return last_replies

    def get_tags(self):
        """Get a sorted tag list"""

        return self.tags.order_by('name')

    def get_sorted_referenced_posts(self):
        return self.referenced_posts.order_by('id')

    def is_referenced(self):
        return self.referenced_posts.count() > 0