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|
# encoding:utf-8
"""
:synopsis: views diplaying and processing main content post forms
This module contains views that allow adding, editing, and deleting main textual content.
"""
import datetime
import logging
import os
import os.path
import random
import sys
import tempfile
import time
import urlparse
from django.shortcuts import get_object_or_404
from django.contrib.auth.decorators import login_required
from django.http import HttpResponseRedirect, HttpResponse, HttpResponseForbidden, Http404
from django.utils import simplejson
from django.utils.html import strip_tags, escape
from django.utils.translation import ugettext as _
from django.core.urlresolvers import reverse
from django.core import exceptions
from django.conf import settings
from django.views.decorators import csrf
from askbot import exceptions as askbot_exceptions
from askbot import forms
from askbot import models
from askbot.skins.loaders import render_into_skin
from askbot.utils import decorators
from askbot.utils.functions import diff_date
from askbot.utils import url_utils
from askbot.utils.file_utils import store_file
from askbot.templatetags import extra_filters_jinja as template_filters
from askbot.importers.stackexchange import management as stackexchange#todo: may change
# used in index page
INDEX_PAGE_SIZE = 20
INDEX_AWARD_SIZE = 15
INDEX_TAGS_SIZE = 100
# used in tags list
DEFAULT_PAGE_SIZE = 60
# used in questions
QUESTIONS_PAGE_SIZE = 10
# used in answers
ANSWERS_PAGE_SIZE = 10
@csrf.csrf_exempt
def upload(request):#ajax upload file to a question or answer
"""view that handles file upload via Ajax
"""
# check upload permission
result = ''
error = ''
new_file_name = ''
try:
#may raise exceptions.PermissionDenied
if request.user.is_anonymous():
msg = _('Sorry, anonymous users cannot upload files')
raise exceptions.PermissionDenied(msg)
request.user.assert_can_upload_file()
#todo: build proper form validation
file_name_prefix = request.POST.get('file_name_prefix', '')
if file_name_prefix not in ('', 'group_logo_'):
raise exceptions.PermissionDenied('invalid upload file name prefix')
# check file type
f = request.FILES['file-upload']
#todo: extension checking should be replaced with mimetype checking
#and this must be part of the form validation
file_extension = os.path.splitext(f.name)[1].lower()
if not file_extension in settings.ASKBOT_ALLOWED_UPLOAD_FILE_TYPES:
file_types = "', '".join(settings.ASKBOT_ALLOWED_UPLOAD_FILE_TYPES)
msg = _("allowed file types are '%(file_types)s'") % \
{'file_types': file_types}
raise exceptions.PermissionDenied(msg)
# generate new file name and storage object
file_storage, new_file_name, file_url = store_file(
f, file_name_prefix
)
# check file size
# byte
size = file_storage.size(new_file_name)
if size > settings.ASKBOT_MAX_UPLOAD_FILE_SIZE:
file_storage.delete(new_file_name)
msg = _("maximum upload file size is %(file_size)sK") % \
{'file_size': settings.ASKBOT_MAX_UPLOAD_FILE_SIZE}
raise exceptions.PermissionDenied(msg)
except exceptions.PermissionDenied, e:
error = unicode(e)
except Exception, e:
logging.critical(unicode(e))
error = _('Error uploading file. Please contact the site administrator. Thank you.')
if error == '':
result = 'Good'
else:
result = ''
file_url = ''
#data = simplejson.dumps({
# 'result': result,
# 'error': error,
# 'file_url': file_url
#})
#return HttpResponse(data, mimetype = 'application/json')
xml_template = "<result><msg><![CDATA[%s]]></msg><error><![CDATA[%s]]></error><file_url>%s</file_url></result>"
xml = xml_template % (result, error, file_url)
return HttpResponse(xml, mimetype="application/xml")
def __import_se_data(dump_file):
"""non-view function that imports the SE data
in the future may import other formats as well
In this function stdout is temporarily
redirected, so that the underlying importer management
command could stream the output to the browser
todo: maybe need to add try/except clauses to restore
the redirects in the exceptional situations
"""
fake_stdout = tempfile.NamedTemporaryFile()
real_stdout = sys.stdout
sys.stdout = fake_stdout
importer = stackexchange.ImporterThread(dump_file = dump_file.name)
importer.start()
#run a loop where we'll be reading output of the
#importer tread and yielding it to the caller
read_stdout = open(fake_stdout.name, 'r')
file_pos = 0
fd = read_stdout.fileno()
yield '<html><body><style>* {font-family: sans;} p {font-size: 12px; line-height: 16px; margin: 0; padding: 0;}</style><h1>Importing your data. This may take a few minutes...</h1>'
while importer.isAlive():
c_size = os.fstat(fd).st_size
if c_size > file_pos:
line = read_stdout.readline()
yield '<p>' + line + '</p>'
file_pos = read_stdout.tell()
fake_stdout.close()
read_stdout.close()
dump_file.close()
sys.stdout = real_stdout
yield '<p>Done. Please, <a href="%s">Visit Your Forum</a></p></body></html>' % reverse('index')
@csrf.csrf_protect
def import_data(request):
"""a view allowing the site administrator
upload stackexchange data
"""
#allow to use this view to site admins
#or when the forum in completely empty
if request.user.is_anonymous() or (not request.user.is_administrator()):
if models.Post.objects.get_questions().exists():
raise Http404
if request.method == 'POST':
#if not request.is_ajax():
# raise Http404
form = forms.DumpUploadForm(request.POST, request.FILES)
if form.is_valid():
dump_file = form.cleaned_data['dump_file']
dump_storage = tempfile.NamedTemporaryFile()
#save the temp file
for chunk in dump_file.chunks():
dump_storage.write(chunk)
dump_storage.flush()
return HttpResponse(__import_se_data(dump_storage))
#yield HttpResponse(_('StackExchange import complete.'), mimetype='text/plain')
#dump_storage.close()
else:
form = forms.DumpUploadForm()
data = {
'dump_upload_form': form,
'need_configuration': (not stackexchange.is_ready())
}
return render_into_skin('import_data.html', data, request)
#@login_required #actually you can post anonymously, but then must register
@csrf.csrf_protect
@decorators.check_authorization_to_post(_(
"<span class=\"strong big\">You are welcome to start submitting your question "
"anonymously</span>. When you submit the post, you will be redirected to the "
"login/signup page. Your question will be saved in the current session and "
"will be published after you log in. Login/signup process is very simple. "
"Login takes about 30 seconds, initial signup takes a minute or less."
))
@decorators.check_spam('text')
def ask(request):#view used to ask a new question
"""a view to ask a new question
gives space for q title, body, tags and checkbox for to post as wiki
user can start posting a question anonymously but then
must login/register in order for the question go be shown
"""
form = forms.AskForm(request.REQUEST)
if request.method == 'POST':
if form.is_valid():
timestamp = datetime.datetime.now()
title = form.cleaned_data['title']
wiki = form.cleaned_data['wiki']
tagnames = form.cleaned_data['tags']
text = form.cleaned_data['text']
ask_anonymously = form.cleaned_data['ask_anonymously']
if request.user.is_authenticated():
try:
question = request.user.post_question(
title = title,
body_text = text,
tags = tagnames,
wiki = wiki,
is_anonymous = ask_anonymously,
timestamp = timestamp
)
return HttpResponseRedirect(question.get_absolute_url())
except exceptions.PermissionDenied, e:
request.user.message_set.create(message = unicode(e))
return HttpResponseRedirect(reverse('index'))
else:
request.session.flush()
session_key = request.session.session_key
summary = strip_tags(text)[:120]
models.AnonymousQuestion.objects.create(
session_key = session_key,
title = title,
tagnames = tagnames,
wiki = wiki,
is_anonymous = ask_anonymously,
text = text,
summary = summary,
added_at = timestamp,
ip_addr = request.META['REMOTE_ADDR'],
)
return HttpResponseRedirect(url_utils.get_login_url())
if request.method == 'GET':
form = forms.AskForm()
form.initial = {
'title': request.REQUEST.get('title', ''),
'text': request.REQUEST.get('text', ''),
'tags': request.REQUEST.get('tags', ''),
'wiki': request.REQUEST.get('wiki', False),
'is_anonymous': request.REQUEST.get('is_anonymous', False),
}
data = {
'active_tab': 'ask',
'page_class': 'ask-page',
'form' : form,
'mandatory_tags': models.tag.get_mandatory_tags(),
'email_validation_faq_url':reverse('faq') + '#validate',
}
return render_into_skin('ask.html', data, request)
@login_required
@csrf.csrf_exempt
def retag_question(request, id):
"""retag question view
"""
question = get_object_or_404(models.Post, id=id)
try:
request.user.assert_can_retag_question(question)
if request.method == 'POST':
form = forms.RetagQuestionForm(question, request.POST)
if form.is_valid():
if form.has_changed():
request.user.retag_question(question=question, tags=form.cleaned_data['tags'])
if request.is_ajax():
response_data = {
'success': True,
'new_tags': question.thread.tagnames
}
data = simplejson.dumps(response_data)
return HttpResponse(data, mimetype="application/json")
else:
return HttpResponseRedirect(question.get_absolute_url())
elif request.is_ajax():
response_data = {
'message': unicode(form.errors['tags']),
'success': False
}
data = simplejson.dumps(response_data)
return HttpResponse(data, mimetype="application/json")
else:
form = forms.RetagQuestionForm(question)
data = {
'active_tab': 'questions',
'question': question,
'form' : form,
}
return render_into_skin('question_retag.html', data, request)
except exceptions.PermissionDenied, e:
if request.is_ajax():
response_data = {
'message': unicode(e),
'success': False
}
data = simplejson.dumps(response_data)
return HttpResponse(data, mimetype="application/json")
else:
request.user.message_set.create(message = unicode(e))
return HttpResponseRedirect(question.get_absolute_url())
@login_required
@csrf.csrf_protect
@decorators.check_spam('text')
def edit_question(request, id):
"""edit question view
"""
question = get_object_or_404(models.Post, id=id)
latest_revision = question.get_latest_revision()
revision_form = None
try:
request.user.assert_can_edit_question(question)
if request.method == 'POST':
if 'select_revision' in request.POST:
#revert-type edit - user selected previous revision
revision_form = forms.RevisionForm(
question,
latest_revision,
request.POST
)
if revision_form.is_valid():
# Replace with those from the selected revision
rev_id = revision_form.cleaned_data['revision']
selected_revision = models.PostRevision.objects.question_revisions().get(
post = question,
revision = rev_id
)
form = forms.EditQuestionForm(
question = question,
user = request.user,
revision = selected_revision
)
else:
form = forms.EditQuestionForm(
request.POST,
question = question,
user = request.user,
revision = latest_revision
)
else:#new content edit
# Always check modifications against the latest revision
form = forms.EditQuestionForm(
request.POST,
question = question,
revision = latest_revision,
user = request.user,
)
revision_form = forms.RevisionForm(question, latest_revision)
if form.is_valid():
if form.has_changed():
if form.cleaned_data['reveal_identity']:
question.thread.remove_author_anonymity()
is_anon_edit = form.cleaned_data['stay_anonymous']
is_wiki = form.cleaned_data.get('wiki', question.wiki)
request.user.edit_question(
question = question,
title = form.cleaned_data['title'],
body_text = form.cleaned_data['text'],
revision_comment = form.cleaned_data['summary'],
tags = form.cleaned_data['tags'],
wiki = is_wiki,
edit_anonymously = is_anon_edit,
)
return HttpResponseRedirect(question.get_absolute_url())
else:
#request type was "GET"
revision_form = forms.RevisionForm(question, latest_revision)
form = forms.EditQuestionForm(
question = question,
revision = latest_revision,
user = request.user
)
data = {
'page_class': 'edit-question-page',
'active_tab': 'questions',
'question': question,
'revision_form': revision_form,
'mandatory_tags': models.tag.get_mandatory_tags(),
'form' : form,
}
return render_into_skin('question_edit.html', data, request)
except exceptions.PermissionDenied, e:
request.user.message_set.create(message = unicode(e))
return HttpResponseRedirect(question.get_absolute_url())
@login_required
@csrf.csrf_protect
@decorators.check_spam('text')
def edit_answer(request, id):
answer = get_object_or_404(models.Post, id=id)
latest_revision = answer.get_latest_revision()
try:
request.user.assert_can_edit_answer(answer)
latest_revision = answer.get_latest_revision()
if request.method == "POST":
if 'select_revision' in request.POST:
# user has changed revistion number
revision_form = forms.RevisionForm(
answer,
latest_revision,
request.POST
)
if revision_form.is_valid():
# Replace with those from the selected revision
rev = revision_form.cleaned_data['revision']
selected_revision = models.PostRevision.objects.answer_revisions().get(
post = answer,
revision = rev
)
form = forms.EditAnswerForm(answer, selected_revision)
else:
form = forms.EditAnswerForm(
answer,
latest_revision,
request.POST
)
else:
form = forms.EditAnswerForm(answer, latest_revision, request.POST)
revision_form = forms.RevisionForm(answer, latest_revision)
if form.is_valid():
if form.has_changed():
request.user.edit_answer(
answer = answer,
body_text = form.cleaned_data['text'],
revision_comment = form.cleaned_data['summary'],
wiki = form.cleaned_data.get('wiki', answer.wiki),
#todo: add wiki field to form
)
return HttpResponseRedirect(answer.get_absolute_url())
else:
revision_form = forms.RevisionForm(answer, latest_revision)
form = forms.EditAnswerForm(answer, latest_revision)
data = {
'page_class': 'edit-answer-page',
'active_tab': 'questions',
'answer': answer,
'revision_form': revision_form,
'form': form,
}
return render_into_skin('answer_edit.html', data, request)
except exceptions.PermissionDenied, e:
request.user.message_set.create(message = unicode(e))
return HttpResponseRedirect(answer.get_absolute_url())
#todo: rename this function to post_new_answer
@decorators.check_authorization_to_post(_('Please log in to answer questions'))
@decorators.check_spam('text')
def answer(request, id):#process a new answer
"""view that posts new answer
anonymous users post into anonymous storage
and redirected to login page
authenticated users post directly
"""
question = get_object_or_404(models.Post, post_type='question', id=id)
if request.method == "POST":
form = forms.AnswerForm(request.POST)
if form.is_valid():
wiki = form.cleaned_data['wiki']
text = form.cleaned_data['text']
update_time = datetime.datetime.now()
if request.user.is_authenticated():
try:
follow = form.cleaned_data['email_notify']
answer = request.user.post_answer(
question = question,
body_text = text,
follow = follow,
wiki = wiki,
timestamp = update_time,
)
return HttpResponseRedirect(answer.get_absolute_url())
except askbot_exceptions.AnswerAlreadyGiven, e:
request.user.message_set.create(message = unicode(e))
answer = question.thread.get_answers_by_user(request.user)[0]
return HttpResponseRedirect(answer.get_absolute_url())
except exceptions.PermissionDenied, e:
request.user.message_set.create(message = unicode(e))
else:
request.session.flush()
models.AnonymousAnswer.objects.create(
question=question,
wiki=wiki,
text=text,
summary=strip_tags(text)[:120],
session_key=request.session.session_key,
ip_addr=request.META['REMOTE_ADDR'],
)
return HttpResponseRedirect(url_utils.get_login_url())
return HttpResponseRedirect(question.get_absolute_url())
def __generate_comments_json(obj, user):#non-view generates json data for the post comments
"""non-view generates json data for the post comments
"""
models.Post.objects.precache_comments(for_posts=[obj], visitor=user)
comments = obj._cached_comments
# {"Id":6,"PostId":38589,"CreationDate":"an hour ago","Text":"hello there!","UserDisplayName":"Jarrod Dixon","UserUrl":"/users/3/jarrod-dixon","DeleteUrl":null}
json_comments = []
for comment in comments:
if user and user.is_authenticated():
try:
user.assert_can_delete_comment(comment)
#/posts/392845/comments/219852/delete
#todo translate this url
is_deletable = True
except exceptions.PermissionDenied:
is_deletable = False
is_editable = template_filters.can_edit_comment(comment.author, comment)
else:
is_deletable = False
is_editable = False
comment_owner = comment.author
tz = ' ' + template_filters.TIMEZONE_STR
comment_data = {'id' : comment.id,
'object_id': obj.id,
'comment_added_at': str(comment.added_at.replace(microsecond = 0)) + tz,
'html': comment.html,
'user_display_name': escape(comment_owner.username),
'user_url': comment_owner.get_profile_url(),
'user_id': comment_owner.id,
'is_deletable': is_deletable,
'is_editable': is_editable,
'score': comment.score,
'upvoted_by_user': getattr(comment, 'upvoted_by_user', False)
}
json_comments.append(comment_data)
data = simplejson.dumps(json_comments)
return HttpResponse(data, mimetype="application/json")
@csrf.csrf_exempt
@decorators.check_spam('comment')
def post_comments(request):#generic ajax handler to load comments to an object
# only support get post comments by ajax now
post_type = request.REQUEST.get('post_type', '')
if not request.is_ajax() or post_type not in ('question', 'answer'):
raise Http404 # TODO: Shouldn't be 404! More like 400, 403 or sth more specific
user = request.user
id = request.REQUEST['post_id']
obj = get_object_or_404(models.Post, id=id)
if request.method == "GET":
response = __generate_comments_json(obj, user)
elif request.method == "POST":
try:
if user.is_anonymous():
msg = _('Sorry, you appear to be logged out and '
'cannot post comments. Please '
'<a href="%(sign_in_url)s">sign in</a>.') % \
{'sign_in_url': url_utils.get_login_url()}
raise exceptions.PermissionDenied(msg)
user.post_comment(parent_post=obj, body_text=request.POST.get('comment'))
response = __generate_comments_json(obj, user)
except exceptions.PermissionDenied, e:
response = HttpResponseForbidden(unicode(e), mimetype="application/json")
return response
@csrf.csrf_exempt
@decorators.ajax_only
@decorators.check_spam('comment')
def edit_comment(request):
if request.user.is_anonymous():
raise exceptions.PermissionDenied(_('Sorry, anonymous users cannot edit comments'))
comment_id = int(request.POST['comment_id'])
comment_post = models.Post.objects.get(post_type='comment', id=comment_id)
request.user.edit_comment(comment_post=comment_post, body_text = request.POST['comment'])
is_deletable = template_filters.can_delete_comment(comment_post.author, comment_post)
is_editable = template_filters.can_edit_comment(comment_post.author, comment_post)
tz = ' ' + template_filters.TIMEZONE_STR
return {
'id' : comment_post.id,
'object_id': comment_post.parent.id,
'comment_added_at': str(comment_post.added_at.replace(microsecond = 0)) + tz,
'html': comment_post.html,
'user_display_name': comment_post.author.username,
'user_url': comment_post.author.get_profile_url(),
'user_id': comment_post.author.id,
'is_deletable': is_deletable,
'is_editable': is_editable,
'score': comment_post.score,
'voted': comment_post.is_upvoted_by(request.user),
}
@csrf.csrf_exempt
def delete_comment(request):
"""ajax handler to delete comment
"""
try:
if request.user.is_anonymous():
msg = _('Sorry, you appear to be logged out and '
'cannot delete comments. Please '
'<a href="%(sign_in_url)s">sign in</a>.') % \
{'sign_in_url': url_utils.get_login_url()}
raise exceptions.PermissionDenied(msg)
if request.is_ajax():
comment_id = request.POST['comment_id']
comment = get_object_or_404(models.Post, post_type='comment', id=comment_id)
request.user.assert_can_delete_comment(comment)
parent = comment.parent
comment.delete()
#attn: recalc denormalized field
parent.comment_count = parent.comment_count - 1
parent.save()
parent.thread.invalidate_cached_data()
return __generate_comments_json(parent, request.user)
raise exceptions.PermissionDenied(
_('sorry, we seem to have some technical difficulties')
)
except exceptions.PermissionDenied, e:
return HttpResponseForbidden(
unicode(e),
mimetype = 'application/json'
)
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