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import datetime
from django.db import models
from django.utils.html import strip_tags
from django.contrib.auth.models import User
from django.contrib.contenttypes import generic
from django.contrib.contenttypes.models import ContentType
from django.contrib.sitemaps import ping_google
#todo: maybe merge forum.utils.markup and forum.utils.html
from forum.utils import markup
from forum.utils.html import sanitize_html
from django.utils import html
import logging
from markdown2 import Markdown
markdowner = Markdown(html4tags=True)
#todo: following methods belong to a future common post class
def parse_post_text(post):
"""typically post has a field to store raw source text
in comment it is called .comment, in Question and Answer it is
called .text
also there is another field called .html (consistent across models)
so the goal of this function is to render raw text into .html
and extract any metadata given stored in source (currently
this metadata is limited by twitter style @mentions
but there may be more in the future
function returns a dictionary with the following keys
html
newly_mentioned_users - list of <User> objects
removed_mentions - list of mention <Activity> objects - for removed ones
"""
text = post.get_text()
if post._urlize:
text = html.urlize(text)
if post._use_markdown:
text = sanitize_html(markdowner.convert(text))
#todo, add markdown parser call conditional on
#post.use_markdown flag
post_html = text
mentioned_authors = list()
removed_mentions = list()
if '@' in text:
from forum.models.user import Activity
mentioned_by = post.get_last_author()
op = post.get_origin_post()
anticipated_authors = op.get_author_list(
include_comments = True,
recursive = True
)
extra_name_seeds = markup.extract_mentioned_name_seeds(text)
extra_authors = set()
for name_seed in extra_name_seeds:
extra_authors.update(User.objects.filter(
username__startswith = name_seed
)
)
#it is important to preserve order here so that authors of post
#get mentioned first
anticipated_authors += list(extra_authors)
mentioned_authors, post_html = markup.mentionize_text(
text,
anticipated_authors
)
#find mentions that were removed and identify any previously
#entered mentions so that we can send alerts on only new ones
if post.pk is not None:
#only look for previous mentions if post was already saved before
prev_mention_qs = Activity.objects.get_mentions(
mentioned_in = post
)
new_set = set(mentioned_authors)
for prev_mention in prev_mention_qs:
user = prev_mention.get_mentioned_user()
if user in new_set:
#don't report mention twice
new_set.remove(user)
else:
removed_mentions.append(prev_mention)
mentioned_authors = list(new_set)
data = {
'html': post_html,
'newly_mentioned_users': mentioned_authors,
'removed_mentions': removed_mentions,
}
return data
def save_post(post, **kwargs):
"""generic save method to use with posts
"""
data = post.parse()
post.html = data['html']
newly_mentioned_users = data['newly_mentioned_users']
removed_mentions = data['removed_mentions']
#a hack allowing to save denormalized .summary field for questions
if hasattr(post, 'summary'):
post.summary = strip_tags(post.html)[:120]
#delete removed mentions
for rm in removed_mentions:
rm.delete()
created = post.pk is None
#this save must precede saving the mention activity
#because generic relation needs primary key of the related object
super(post.__class__, post).save(**kwargs)
last_author = post.get_last_author()
#create new mentions
for u in newly_mentioned_users:
from forum.models.user import Activity
Activity.objects.create_new_mention(
mentioned_whom = u,
mentioned_in = post,
mentioned_by = last_author
)
#todo: this is handled in signal because models for posts
#are too spread out
from forum.models import signals
signals.post_updated.send(
post = post,
updated_by = last_author,
newly_mentioned_users = newly_mentioned_users,
timestamp = post.get_time_of_last_edit(),
created = created,
sender = post.__class__
)
try:
ping_google()
except Exception:
logging.debug('problem pinging google did you register the sitemap with google?')
class UserContent(models.Model):
user = models.ForeignKey(User, related_name='%(class)ss')
class Meta:
abstract = True
app_label = 'forum'
def get_last_author(self):
"""
get author who last edited the content
since here we don't have revisions, it will be the creator
"""
return self.user
class MetaContent(models.Model):
"""
Base class for Vote, Comment and FlaggedItem
"""
content_type = models.ForeignKey(ContentType)
object_id = models.PositiveIntegerField()
content_object = generic.GenericForeignKey('content_type', 'object_id')
class Meta:
abstract = True
app_label = 'forum'
class DeletableContent(models.Model):
deleted = models.BooleanField(default=False)
deleted_at = models.DateTimeField(null=True, blank=True)
deleted_by = models.ForeignKey(User, null=True, blank=True, related_name='deleted_%(class)ss')
class Meta:
abstract = True
app_label = 'forum'
class ContentRevision(models.Model):
"""
Base class for QuestionRevision and AnswerRevision
"""
revision = models.PositiveIntegerField()
author = models.ForeignKey(User, related_name='%(class)ss')
revised_at = models.DateTimeField()
summary = models.CharField(max_length=300, blank=True)
text = models.TextField()
class Meta:
abstract = True
app_label = 'forum'
class AnonymousContent(models.Model):
"""
Base class for AnonymousQuestion and AnonymousAnswer
"""
session_key = models.CharField(max_length=40) #session id for anonymous questions
wiki = models.BooleanField(default=False)
added_at = models.DateTimeField(default=datetime.datetime.now)
ip_addr = models.IPAddressField(max_length=21) #allow high port numbers
author = models.ForeignKey(User,null=True)
text = models.TextField()
summary = models.CharField(max_length=180)
class Meta:
abstract = True
app_label = 'forum'
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