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# encoding:utf-8
import datetime
import logging
from urllib import unquote
from django.conf import settings
from django.shortcuts import render_to_response, get_object_or_404
from django.http import HttpResponseRedirect, HttpResponse, HttpResponseForbidden, Http404
from django.core.paginator import Paginator, EmptyPage, InvalidPage
from django.template import RequestContext
from django.utils.html import *
from django.utils import simplejson
from django.db.models import Q
from django.utils.translation import ugettext as _
from django.template.defaultfilters import slugify
from django.core.urlresolvers import reverse
from django.utils.datastructures import SortedDict
from django.views.decorators.cache import cache_page
from forum.utils.html import sanitize_html
from markdown2 import Markdown
#from lxml.html.diff import htmldiff
from forum.utils.diff import textDiff as htmldiff
from forum.forms import *
from forum.models import *
from forum.auth import *
from forum.const import *
from forum import auth
from forum.utils.forms import get_next_url
# used in index page
#refactor - move these numbers somewhere?
INDEX_PAGE_SIZE = 30
INDEX_AWARD_SIZE = 15
INDEX_TAGS_SIZE = 25
# used in tags list
DEFAULT_PAGE_SIZE = 60
# used in questions
QUESTIONS_PAGE_SIZE = 30
# used in answers
ANSWERS_PAGE_SIZE = 10
markdowner = Markdown(html4tags=True)
#system to display main content
def _get_tags_cache_json():#service routine used by views requiring tag list in the javascript space
"""returns list of all tags in json format
no caching yet, actually
"""
tags = Tag.objects.filter(deleted=False).all()
tags_list = []
for tag in tags:
dic = {'n': tag.name, 'c': tag.used_count}
tags_list.append(dic)
tags = simplejson.dumps(tags_list)
return tags
def _get_and_remember_questions_sort_method(request, view_dic, default):#service routine used by q listing views and question view
"""manages persistence of post sort order
it is assumed that when user wants newest question -
then he/she wants newest answers as well, etc.
how far should this assumption actually go - may be a good question
"""
if default not in view_dic:
raise Exception('default value must be in view_dic')
q_sort_method = request.REQUEST.get('sort', None)
if q_sort_method == None:
q_sort_method = request.session.get('questions_sort_method', default)
if q_sort_method not in view_dic:
q_sort_method = default
request.session['questions_sort_method'] = q_sort_method
return q_sort_method, view_dic[q_sort_method]
#refactor? - we have these
#views that generate a listing of questions in one way or another:
#index, unanswered, questions, search, tag
#should we dry them up?
#related topics - information drill-down, search refinement
def index(request):#generates front page - shows listing of questions sorted in various ways
"""index view mapped to the root url of the Q&A site
"""
view_dic = {
"latest":"-last_activity_at",
"hottest":"-answer_count",
"mostvoted":"-score",
}
view_id, orderby = _get_and_remember_questions_sort_method(request, view_dic, 'latest')
pagesize = request.session.get("pagesize",QUESTIONS_PAGE_SIZE)
try:
page = int(request.GET.get('page', '1'))
except ValueError:
page = 1
qs = Question.objects.exclude(deleted=True).order_by(orderby)
objects_list = Paginator(qs, pagesize)
questions = objects_list.page(page)
# RISK - inner join queries
#questions = questions.select_related()
tags = Tag.objects.get_valid_tags(INDEX_TAGS_SIZE)
awards = Award.objects.get_recent_awards()
(interesting_tag_names, ignored_tag_names) = (None, None)
if request.user.is_authenticated():
pt = MarkedTag.objects.filter(user=request.user)
interesting_tag_names = pt.filter(reason='good').values_list('tag__name', flat=True)
ignored_tag_names = pt.filter(reason='bad').values_list('tag__name', flat=True)
tags_autocomplete = _get_tags_cache_json()
return render_to_response('index.html', {
'interesting_tag_names': interesting_tag_names,
'tags_autocomplete': tags_autocomplete,
'ignored_tag_names': ignored_tag_names,
"questions" : questions,
"tab_id" : view_id,
"tags" : tags,
"awards" : awards[:INDEX_AWARD_SIZE],
"context" : {
'is_paginated' : True,
'pages': objects_list.num_pages,
'page': page,
'has_previous': questions.has_previous(),
'has_next': questions.has_next(),
'previous': questions.previous_page_number(),
'next': questions.next_page_number(),
'base_url' : request.path + '?sort=%s&' % view_id,
'pagesize' : pagesize
}}, context_instance=RequestContext(request))
def unanswered(request):#generates listing of unanswered questions
return questions(request, unanswered=True)
def questions(request, tagname=None, unanswered=False):#a view generating listing of questions, used by 'unanswered' too
"""
List of Questions, Tagged questions, and Unanswered questions.
"""
# template file
# "questions.html" or maybe index.html in the future
template_file = "questions.html"
# Set flag to False by default. If it is equal to True, then need to be saved.
pagesize_changed = False
# get pagesize from session, if failed then get default value
pagesize = request.session.get("pagesize",QUESTIONS_PAGE_SIZE)
try:
page = int(request.GET.get('page', '1'))
except ValueError:
page = 1
view_dic = {"latest":"-added_at", "active":"-last_activity_at", "hottest":"-answer_count", "mostvoted":"-score" }
view_id, orderby = _get_and_remember_questions_sort_method(request,view_dic,'latest')
# check if request is from tagged questions
qs = Question.objects.exclude(deleted=True)
if tagname is not None:
qs = qs.filter(tags__name = unquote(tagname))
if unanswered:
qs = qs.exclude(answer_accepted=True)
author_name = None
#user contributed questions & answers
if 'user' in request.GET:
try:
author_name = request.GET['user']
u = User.objects.get(username=author_name)
qs = qs.filter(Q(author=u) | Q(answers__author=u))
except User.DoesNotExist:
author_name = None
if request.user.is_authenticated():
uid_str = str(request.user.id)
qs = qs.extra(
select = SortedDict([
(
'interesting_score',
'SELECT COUNT(1) FROM forum_markedtag, question_tags '
+ 'WHERE forum_markedtag.user_id = %s '
+ 'AND forum_markedtag.tag_id = question_tags.tag_id '
+ 'AND forum_markedtag.reason = \'good\' '
+ 'AND question_tags.question_id = question.id'
),
]),
select_params = (uid_str,),
)
if request.user.hide_ignored_questions:
ignored_tags = Tag.objects.filter(user_selections__reason='bad',
user_selections__user = request.user)
qs = qs.exclude(tags__in=ignored_tags)
else:
qs = qs.extra(
select = SortedDict([
(
'ignored_score',
'SELECT COUNT(1) FROM forum_markedtag, question_tags '
+ 'WHERE forum_markedtag.user_id = %s '
+ 'AND forum_markedtag.tag_id = question_tags.tag_id '
+ 'AND forum_markedtag.reason = \'bad\' '
+ 'AND question_tags.question_id = question.id'
)
]),
select_params = (uid_str, )
)
qs = qs.select_related(depth=1).order_by(orderby)
objects_list = Paginator(qs, pagesize)
questions = objects_list.page(page)
# Get related tags from this page objects
if questions.object_list.count() > 0:
related_tags = Tag.objects.get_tags_by_questions(questions.object_list)
else:
related_tags = None
tags_autocomplete = _get_tags_cache_json()
# get the list of interesting and ignored tags
(interesting_tag_names, ignored_tag_names) = (None, None)
if request.user.is_authenticated():
pt = MarkedTag.objects.filter(user=request.user)
interesting_tag_names = pt.filter(reason='good').values_list('tag__name', flat=True)
ignored_tag_names = pt.filter(reason='bad').values_list('tag__name', flat=True)
return render_to_response(template_file, {
"questions" : questions,
"author_name" : author_name,
"tab_id" : view_id,
"questions_count" : objects_list.count,
"tags" : related_tags,
"tags_autocomplete" : tags_autocomplete,
"searchtag" : tagname,
"is_unanswered" : unanswered,
"interesting_tag_names": interesting_tag_names,
'ignored_tag_names': ignored_tag_names,
"context" : {
'is_paginated' : True,
'pages': objects_list.num_pages,
'page': page,
'has_previous': questions.has_previous(),
'has_next': questions.has_next(),
'previous': questions.previous_page_number(),
'next': questions.next_page_number(),
'base_url' : request.path + '?sort=%s&' % view_id,
'pagesize' : pagesize
}}, context_instance=RequestContext(request))
def search(request): #generates listing of questions matching a search query - including tags and just words
"""generates listing of questions matching a search query
supports full text search in mysql db using sphinx and internally in postgresql
falls back on simple partial string matching approach if
full text search function is not available
"""
if request.method == "GET":
keywords = request.GET.get("q")
search_type = request.GET.get("t")
try:
page = int(request.GET.get('page', '1'))
except ValueError:
page = 1
if keywords is None:
return HttpResponseRedirect(reverse(index))
if search_type == 'tag':
return HttpResponseRedirect(reverse('tags') + '?q=%s&page=%s' % (keywords.strip(), page))
elif search_type == "user":
return HttpResponseRedirect(reverse('users') + '?q=%s&page=%s' % (keywords.strip(), page))
elif search_type == "question":
template_file = "questions.html"
# Set flag to False by default. If it is equal to True, then need to be saved.
pagesize_changed = False
# get pagesize from session, if failed then get default value
user_page_size = request.session.get("pagesize", QUESTIONS_PAGE_SIZE)
# set pagesize equal to logon user specified value in database
if request.user.is_authenticated() and request.user.questions_per_page > 0:
user_page_size = request.user.questions_per_page
try:
page = int(request.GET.get('page', '1'))
# get new pagesize from UI selection
pagesize = int(request.GET.get('pagesize', user_page_size))
if pagesize <> user_page_size:
pagesize_changed = True
except ValueError:
page = 1
pagesize = user_page_size
# save this pagesize to user database
if pagesize_changed:
request.session["pagesize"] = pagesize
if request.user.is_authenticated():
user = request.user
user.questions_per_page = pagesize
user.save()
view_id = request.GET.get('sort', None)
view_dic = {"latest":"-added_at", "active":"-last_activity_at", "hottest":"-answer_count", "mostvoted":"-score" }
try:
orderby = view_dic[view_id]
except KeyError:
view_id = "latest"
orderby = "-added_at"
def question_search(keywords, orderby):
objects = Question.objects.filter(deleted=False).extra(where=['title like %s'], params=['%' + keywords + '%']).order_by(orderby)
# RISK - inner join queries
return objects.select_related();
from forum.modules import get_handler
question_search = get_handler('question_search', question_search)
objects = question_search(keywords, orderby)
objects_list = Paginator(objects, pagesize)
questions = objects_list.page(page)
# Get related tags from this page objects
related_tags = []
for question in questions.object_list:
tags = list(question.tags.all())
for tag in tags:
if tag not in related_tags:
related_tags.append(tag)
#if is_search is true in the context, prepend this string to soting tabs urls
search_uri = "?q=%s&page=%d&t=question" % ("+".join(keywords.split()), page)
return render_to_response(template_file, {
"questions" : questions,
"tab_id" : view_id,
"questions_count" : objects_list.count,
"tags" : related_tags,
"searchtag" : None,
"searchtitle" : keywords,
"keywords" : keywords,
"is_unanswered" : False,
"is_search": True,
"search_uri": search_uri,
"context" : {
'is_paginated' : True,
'pages': objects_list.num_pages,
'page': page,
'has_previous': questions.has_previous(),
'has_next': questions.has_next(),
'previous': questions.previous_page_number(),
'next': questions.next_page_number(),
'base_url' : request.path + '?t=question&q=%s&sort=%s&' % (keywords, view_id),
'pagesize' : pagesize
}}, context_instance=RequestContext(request))
else:
raise Http404
def tag(request, tag):#stub generates listing of questions tagged with a single tag
return questions(request, tagname=tag)
def tags(request):#view showing a listing of available tags - plain list
stag = ""
is_paginated = True
sortby = request.GET.get('sort', 'used')
try:
page = int(request.GET.get('page', '1'))
except ValueError:
page = 1
if request.method == "GET":
stag = request.GET.get("q", "").strip()
if stag != '':
objects_list = Paginator(Tag.objects.filter(deleted=False).exclude(used_count=0).extra(where=['name like %s'], params=['%' + stag + '%']), DEFAULT_PAGE_SIZE)
else:
if sortby == "name":
objects_list = Paginator(Tag.objects.all().filter(deleted=False).exclude(used_count=0).order_by("name"), DEFAULT_PAGE_SIZE)
else:
objects_list = Paginator(Tag.objects.all().filter(deleted=False).exclude(used_count=0).order_by("-used_count"), DEFAULT_PAGE_SIZE)
try:
tags = objects_list.page(page)
except (EmptyPage, InvalidPage):
tags = objects_list.page(objects_list.num_pages)
return render_to_response('tags.html', {
"tags" : tags,
"stag" : stag,
"tab_id" : sortby,
"keywords" : stag,
"context" : {
'is_paginated' : is_paginated,
'pages': objects_list.num_pages,
'page': page,
'has_previous': tags.has_previous(),
'has_next': tags.has_next(),
'previous': tags.previous_page_number(),
'next': tags.next_page_number(),
'base_url' : reverse('tags') + '?sort=%s&' % sortby
}
}, context_instance=RequestContext(request))
def question(request, id):#refactor - long subroutine. display question body, answers and comments
"""view that displays body of the question and
all answers to it
"""
try:
page = int(request.GET.get('page', '1'))
except ValueError:
page = 1
view_id = request.GET.get('sort', None)
view_dic = {"latest":"-added_at", "oldest":"added_at", "votes":"-score" }
try:
orderby = view_dic[view_id]
except KeyError:
qsm = request.session.get('questions_sort_method',None)
if qsm in ('mostvoted','latest'):
logging.debug('loaded from session ' + qsm)
if qsm == 'mostvoted':
view_id = 'votes'
orderby = '-score'
else:
view_id = 'latest'
orderby = '-added_at'
else:
view_id = "votes"
orderby = "-score"
logging.debug('view_id=' + str(view_id))
question = get_object_or_404(Question, id=id)
try:
pattern = r'/%s%s%d/([\w-]+)' % (settings.FORUM_SCRIPT_ALIAS,_('question/'), question.id)
path_re = re.compile(pattern)
logging.debug(pattern)
logging.debug(request.path)
m = path_re.match(request.path)
if m:
slug = m.group(1)
logging.debug('have slug %s' % slug)
assert(slug == slugify(question.title))
else:
logging.debug('no match!')
except:
return HttpResponseRedirect(question.get_absolute_url())
if question.deleted and not auth.can_view_deleted_post(request.user, question):
raise Http404
answer_form = AnswerForm(question,request.user)
answers = Answer.objects.get_answers_from_question(question, request.user)
answers = answers.select_related(depth=1)
favorited = question.has_favorite_by_user(request.user)
if request.user.is_authenticated():
question_vote = question.votes.select_related().filter(user=request.user)
else:
question_vote = None #is this correct?
if question_vote is not None and question_vote.count() > 0:
question_vote = question_vote[0]
user_answer_votes = {}
for answer in answers:
vote = answer.get_user_vote(request.user)
if vote is not None and not user_answer_votes.has_key(answer.id):
vote_value = -1
if vote.is_upvote():
vote_value = 1
user_answer_votes[answer.id] = vote_value
if answers is not None:
answers = answers.order_by("-accepted", orderby)
filtered_answers = []
for answer in answers:
if answer.deleted == True:
if answer.author_id == request.user.id:
filtered_answers.append(answer)
else:
filtered_answers.append(answer)
objects_list = Paginator(filtered_answers, ANSWERS_PAGE_SIZE)
page_objects = objects_list.page(page)
#todo: merge view counts per user and per session
#1) view count per session
update_view_count = False
if 'question_view_times' not in request.session:
request.session['question_view_times'] = {}
last_seen = request.session['question_view_times'].get(question.id,None)
updated_when, updated_who = question.get_last_update_info()
if updated_who != request.user:
if last_seen:
if last_seen < updated_when:
update_view_count = True
else:
update_view_count = True
request.session['question_view_times'][question.id] = datetime.datetime.now()
if update_view_count:
question.view_count += 1
question.save()
#2) question view count per user
if request.user.is_authenticated():
try:
question_view = QuestionView.objects.get(who=request.user, question=question)
except QuestionView.DoesNotExist:
question_view = QuestionView(who=request.user, question=question)
question_view.when = datetime.datetime.now()
question_view.save()
return render_to_response('question.html', {
"question" : question,
"question_vote" : question_vote,
"question_comment_count":question.comments.count(),
"answer" : answer_form,
"answers" : page_objects.object_list,
"user_answer_votes": user_answer_votes,
"tags" : question.tags.all(),
"tab_id" : view_id,
"favorited" : favorited,
"similar_questions" : Question.objects.get_similar_questions(question),
"context" : {
'is_paginated' : True,
'pages': objects_list.num_pages,
'page': page,
'has_previous': page_objects.has_previous(),
'has_next': page_objects.has_next(),
'previous': page_objects.previous_page_number(),
'next': page_objects.next_page_number(),
'base_url' : request.path + '?sort=%s&' % view_id,
'extend_url' : "#sort-top"
}
}, context_instance=RequestContext(request))
QUESTION_REVISION_TEMPLATE = ('<h1>%(title)s</h1>\n'
'<div class="text">%(html)s</div>\n'
'<div class="tags">%(tags)s</div>')
def question_revisions(request, id):
post = get_object_or_404(Question, id=id)
revisions = list(post.revisions.all())
revisions.reverse()
for i, revision in enumerate(revisions):
revision.html = QUESTION_REVISION_TEMPLATE % {
'title': revision.title,
'html': sanitize_html(markdowner.convert(revision.text)),
'tags': ' '.join(['<a class="post-tag">%s</a>' % tag
for tag in revision.tagnames.split(' ')]),
}
if i > 0:
revisions[i].diff = htmldiff(revisions[i-1].html, revision.html)
else:
revisions[i].diff = QUESTION_REVISION_TEMPLATE % {
'title': revisions[0].title,
'html': sanitize_html(markdowner.convert(revisions[0].text)),
'tags': ' '.join(['<a class="post-tag">%s</a>' % tag
for tag in revisions[0].tagnames.split(' ')]),
}
revisions[i].summary = _('initial version')
return render_to_response('revisions_question.html', {
'post': post,
'revisions': revisions,
}, context_instance=RequestContext(request))
ANSWER_REVISION_TEMPLATE = ('<div class="text">%(html)s</div>')
def answer_revisions(request, id):
post = get_object_or_404(Answer, id=id)
revisions = list(post.revisions.all())
revisions.reverse()
for i, revision in enumerate(revisions):
revision.html = ANSWER_REVISION_TEMPLATE % {
'html': sanitize_html(markdowner.convert(revision.text))
}
if i > 0:
revisions[i].diff = htmldiff(revisions[i-1].html, revision.html)
else:
revisions[i].diff = revisions[i].text
revisions[i].summary = _('initial version')
return render_to_response('revisions_answer.html', {
'post': post,
'revisions': revisions,
}, context_instance=RequestContext(request))
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