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comparison gpp/comments/views.py @ 1:dbd703f7d63a

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Initial import of sg101 stuff from private repository.
author gremmie
date Mon, 06 Apr 2009 02:43:12 +0000
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children d203a4a986d2
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0:900ba3c7b765 1:dbd703f7d63a
1 """
2 Views for the comments application.
3 """
4 from django.contrib.auth.decorators import login_required
5 from django.core.exceptions import ObjectDoesNotExist
6 from django.http import HttpResponse
7 from django.http import HttpResponseRedirect
8 from django.http import HttpResponseBadRequest
9 from django.http import HttpResponseForbidden
10 from django.db.models import get_model
11 from django.shortcuts import render_to_response
12 from django.template import RequestContext
13 from django.utils.html import escape
14 from django.views.decorators.http import require_POST
15
16 from core.functions import email_admins
17 from comments.forms import CommentForm
18 from comments.models import Comment
19 from comments.models import CommentFlag
20
21 @login_required
22 @require_POST
23 def post_comment(request):
24 """
25 This function handles the posting of comments. If successful, returns
26 the comment text as the response. This function is mean't to be the target
27 of an AJAX post.
28 """
29 # Look up the object we're trying to comment about
30 ctype = request.POST.get('content_type', None)
31 object_pk = request.POST.get('object_pk', None)
32 if ctype is None or object_pk is None:
33 return HttpResponseBadRequest('Missing content_type or object_pk field.')
34
35 try:
36 model = get_model(*ctype.split('.', 1))
37 target = model.objects.get(pk=object_pk)
38 except TypeError:
39 return HttpResponseBadRequest(
40 "Invalid content_type value: %r" % escape(ctype))
41 except AttributeError:
42 return HttpResponseBadRequest(
43 "The given content-type %r does not resolve to a valid model." % \
44 escape(ctype))
45 except ObjectDoesNotExist:
46 return HttpResponseBadRequest(
47 "No object matching content-type %r and object PK %r exists." % \
48 (escape(ctype), escape(object_pk)))
49
50 # Can we comment on the target object?
51 if hasattr(target, 'can_comment_on'):
52 if callable(target.can_comment_on):
53 can_comment_on = target.can_comment_on()
54 else:
55 can_comment_on = target.can_comment_on
56 else:
57 can_comment_on = True
58
59 if not can_comment_on:
60 return HttpResponseForbidden('Cannot comment on this item.')
61
62 # Check form validity
63
64 form = CommentForm(target, request.POST)
65 if not form.is_valid():
66 return HttpResponseBadRequest('Invalid comment; missing parameters?')
67
68 # else, create and save the comment
69
70 comment = form.get_comment_object(request.user, request.META.get("REMOTE_ADDR", None))
71 comment.save()
72
73 # return the rendered comment
74 return render_to_response('comments/comment.html', {
75 'comment': comment,
76 },
77 context_instance = RequestContext(request))
78
79
80 @require_POST
81 def flag_comment(request):
82 """
83 This function handles the flagging of comments by users. This function should
84 be the target of an AJAX post.
85 """
86 if not request.user.is_authenticated():
87 return HttpResponse('Please login or register to flag a comment.')
88
89 id = request.POST.get('id', None)
90 if id is None:
91 return HttpResponseBadRequest('No id')
92
93 try:
94 comment = Comment.objects.get(pk=id)
95 except Comment.DoesNotExist:
96 return HttpResponseBadRequest('No comment with id %s' % id)
97
98 flag = CommentFlag(user=request.user, comment=comment)
99 flag.save()
100 email_admins('A Comment Has Been Flagged', """Hello,
101
102 A user has flagged a comment for review.
103 """)
104 return HttpResponse('The comment was flagged. A moderator will review the comment shortly. ' \
105 'Thanks for helping to improve the discussions on this site.')
106
107
108 @require_POST
109 def markdown_preview(request):
110 """
111 This function should be the target of an AJAX POST. It takes the 'data' parameter
112 from the POST parameters and returns a rendered HTML page from the data, which
113 is assumed to be in markdown format. The HTML page is suitable for the preview
114 function for a javascript editor such as markItUp.
115 """
116 if not request.user.is_authenticated():
117 return HttpResponseForbidden('This service is only available to logged in users.')
118
119 data = request.POST.get('data', None)
120 if data is None:
121 return HttpResponseBadRequest('No data')
122
123 return render_to_response('comments/markdown_preview.html', {
124 'data': data,
125 },
126 context_instance = RequestContext(request))