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import datetime
import cgi
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
#todo: maybe merge askbot.utils.markup and forum.utils.html
from askbot.utils import markup
from askbot.utils.html import sanitize_html
from django.utils import html
import logging
#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._escape_html:
text = cgi.escape(text)
if post._urlize:
text = html.urlize(text)
if post._use_markdown:
text = sanitize_html(markup.get_parser().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 askbot.models.user import Activity
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 is None:
continue
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
#todo: when models are merged, it would be great to remove author parameter
def parse_and_save_post(post, author = None, **kwargs):
"""generic method to use with posts to be used prior to saving
post edit or addition
"""
assert(author is not None)
data = post.parse()
post.html = data['html']
newly_mentioned_users = set(data['newly_mentioned_users']) - set([author])
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)
timestamp = post.get_time_of_last_edit()
#create new mentions
for u in newly_mentioned_users:
from askbot.models.user import Activity
Activity.objects.create_new_mention(
mentioned_whom = u,
mentioned_in = post,
mentioned_by = author,
mentioned_at = timestamp
)
#todo: this is handled in signal because models for posts
#are too spread out
from askbot.models import signals
signals.post_updated.send(
post = post,
updated_by = author,
newly_mentioned_users = newly_mentioned_users,
timestamp = timestamp,
created = created,
sender = post.__class__
)
try:
from askbot.conf import settings as askbot_settings
if askbot_settings.GOOGLE_SITEMAP_CODE != '':
ping_google()
except Exception:
logging.debug('cannot ping google - did you register with them?')
class UserContent(models.Model):
user = models.ForeignKey(User, related_name='%(class)ss')
class Meta:
abstract = True
app_label = 'askbot'
class MetaContent(models.Model):
"""
Base class for Vote and Comment
"""
content_type = models.ForeignKey(ContentType)
object_id = models.PositiveIntegerField()
content_object = generic.GenericForeignKey('content_type', 'object_id')
class Meta:
abstract = True
app_label = 'askbot'
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 = 'askbot'
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 = 'askbot'
def as_html(self):
"""should return html representation of
the revision
"""
raise NotImplementedError()
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 = 'askbot'
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