def get(self, request, post_id, comment_id=None, format=None):
'''
delete a specified comment by its comment_id
'''
try:
post = Post.objects.filter(id=post_id)
if not post.exists():
return HttpResponseNotFound("Post Not Found")
post = Post.objects.get(id=post_id)
if not checkVisibility(request.user.url, post):
return HttpResponseForbidden("You don't have visibility.")
comment = Comment.objects.filter(id=comment_id)
if not comment.exists():
return HttpResponseNotFound("Comment Not Found")
comment = Comment.objects.get(id=comment_id)
if request.user.has_perm('owner of comment', comment):
comment.delete()
return HttpResponseRedirect(
reverse('posting:view post details', args=(post_id, )), {})
else:
return HttpResponseForbidden(
"You must be the owner of this comment.")
except Exception as e:
return HttpResponseServerError(e)
def getVisiblePosts(requester_url, author_url=None, IsShareImg=False):
'''
To a list of visible posts.
parameter:
requster: an author url of whom the requst on behalf.
author: an local author url
return:
result: a list of visble of posts.
'''
bannedType = "_" if IsShareImg else "image"
result = []
if author_url:
author = Author.objects.get(url=author_url)
posts = Post.objects.filter(
Q(author=author, unlisted=False)
& ~Q(contentType__contains=bannedType)).order_by('-published')
else:
posts = Post.objects.filter(
Q(unlisted=False)
& ~Q(contentType__contains=bannedType)).order_by('-published')
#Append post to result according to visibility and user's status
for post in posts:
if checkVisibility(requester_url, post):
result.append(post)
return result
def post(self, request, post_id, comment_id=None, format=None):
"""
Create a comment to a given Post Id.
"""
try:
post_host = request.POST.get('post_origin', None)
if post_host:
post_host = post_host.split('posts/')[0]
#Target post on remote server
if post_host and not post_host == settings.HOSTNAME:
nodes = ServerNode.objects.filter(
host_url__startswith=post_host)
if nodes.exists():
post, _ = getRemotePost(post_id, nodes, request.user.url)
if not post:
friends = []
friend_objs = getAllFriends(request.user.id)
for obj in friend_objs:
friends.append(obj.url)
node = nodes[0]
post, _ = getRemoteFOAFPost(node, post_id,
request.user, friends)
if post:
remote_comment = Comment(
comment=request.POST['comment'],
author=request.user,
post=post,
contentType=request.POST['contentType'])
if postRemotePostComment(remote_comment,
request.user.url):
return HttpResponseRedirect(
reverse('posting:view post details',
args=(post_id, )), {})
else:
return HttpResponseForbidden(
"Remote comment failed.")
return HttpResponseNotFound("Post Not Found")
#Target post on local server
else:
post = Post.objects.filter(id=post_id)
if not post.exists():
return HttpResponseNotFound("Post not found.")
post = post[0]
if not checkVisibility(request.user.url, post):
return HttpResponseForbidden("You don't have visibility.")
serializer = CommentSerializer(data=request.POST,
context={
'author': request.user,
'post': post
})
if serializer.is_valid(raise_exception=True):
serializer.save()
return HttpResponseRedirect(
reverse('posting:view post details', args=(post_id, )), {})
else:
return Response("Comment save failed. Invalid data")
except Exception as e:
return HttpResponseServerError(e)
def getVisiblePosts(requester, author=None):
result = set()
#the current user hasn't login yet, show some random public posts
if requester.is_anonymous or requester.host != settings.HOSTNAME:
if author:
return list(
Post.objects.filter(author=author,
visibility='PUBLIC',
unlisted=False).order_by('-published'))
else:
return list(
Post.objects.filter(visibility='PUBLIC',
unlisted=False).order_by('-published'))
#only check onef author's posts or all posts
remote_visibile_posts = set()
if author:
#Get all remote visibile post of author
node = ServerNode.objects.filter(host_url__startswith=author.host)
node = node[0] if node.exists() else None
if node:
remote_visibile_posts = getRemoteAuthorPosts(
author.id, requester.url, node)
local_posts = Post.objects.filter(
author=author, unlisted=False).order_by('-published')
else:
#Get all remote visibile post
nodes = ServerNode.objects.all()
remote_visibile_posts = getRemoteVisiblePost(nodes, requester.url)
local_posts = Post.objects.filter(
unlisted=False).order_by('-published')
#Get all local visibile post
for post in local_posts:
if checkVisibility(requester.url, post):
result.add(post)
if author == requester:
unlisted_posts = Post.objects.filter(author=author, unlisted=True)
for post in unlisted_posts:
result.add(post)
result.update(remote_visibile_posts)
return list(result)
def get(self, request, post_id, format=None):
"""
Return a detail of post by given Post Id.
"""
post = Post.objects.filter(id=post_id)
#Remote request
if not post.exists():
nodes = ServerNode.objects.all()
if nodes.exists():
post, comments = getRemotePost(post_id, nodes,
request.user.url)
if not post:
friends_obj = getAllFriends(request.user.id)
friends = []
for obj in friends_obj:
friends.append(obj.url)
nodes = ServerNode.objects.all()
if nodes.exists():
for node in nodes:
post, comments = getRemoteFOAFPost(
node, post_id, request.user, friends)
if post:
print(post.author)
break
if not post:
return HttpResponseNotFound("Post not found")
#Local request
else:
post = post[0]
if not checkVisibility(request.user.url, post):
return HttpResponseForbidden("You don't have visibility.")
comments = Comment.objects.filter(post=post)
context = {
'post': post,
'comment_list': comments[:10],
}
return render(request, "posting/post-details.html", context)
def handle_comments(request, post_id):
'''
GET: To get comments from visible posts
POST: To add a comment to the visible post.
'''
#Handler GET requests
if request.method == 'GET':
try:
if not 'HTTP_X_USER_ID' in request.META.keys():
return HttpResponseForbidden(
"Who's requesting posts? Put author's url in request headers under 'x-user-id'"
)
requester_url = request.META.get('HTTP_X_USER_ID')
#Get the post specified by request
post = Post.objects.filter(id=post_id)
if not post.exists():
return HttpResponseNotFound("Post Not Found.")
post = post[0]
#Reject request if anonymous user or user does not have visibility
if not checkVisibility(requester_url, post):
return HttpResponseForbidden(b"You dont have visibility.")
#Valid request -> get comments data and return in response
paginator = CustomPagination()
comments = Comment.objects.filter(post=post).order_by('-published')
try:
comments = paginator.paginate_queryset(comments, request)
except Exception as e:
return HttpResponseNotFound(e)
serializer = CommentSerializer(comments, many=True)
response = paginator.get_paginated_response(query="comments",
data_name='comments',
data=serializer.data)
return response
#Server error when handling reqeust
except Exception as e:
return HttpResponseServerError(e)
#Handler POST requests (add a comment to the post)
elif request.method == 'POST':
#Initialize response context
context = {
"query": "addComment",
"success": False,
"message": "Comment not Allowed",
}
try:
#Parse comment form data from request
data = json.loads(request.body)
if not ('post' in data.keys() and 'comment' in data.keys()
and 'author' in data['comment'].keys()):
return Response(context, status=403)
post_info = data['post']
comment_info = data['comment']
author_info = comment_info['author']
author_info['id'] = author_info['id'].split('author/')[-1]
author_info['email'] = "{}@remote_user.com".format(
author_info['id'])
#Get target post object on local server
post_id = post_info.split('posts/')[-1]
post = Post.objects.filter(id=post_id)
if not post.exists():
return Response(context, status=403)
post = post[0]
#Check if comment author has visibility of post
requester_url = author_info['url']
#Check visibility
if not checkVisibility(requester_url, post):
return Response(context, status=403)
#Get comment author object on local server
comment_author, _ = Author.objects.get_or_create(**author_info)
comment_info['author'] = comment_author
comment_info['post'] = post
new_comment = Comment.objects.filter(**comment_info)
if new_comment.exists():
return Response(context, status=403)
#Create a comment as required
new_comment = Comment.objects.create(**comment_info)
if new_comment:
#return success response
context['success'] = True
context['message'] = "Comment Added"
return Response(context, status=200)
#comment create failed.
else:
return Response(context, status=403)
#Server error when handling request
except Exception as e:
return HttpResponseServerError(e)
#Method not allowed
else:
return HttpResponseNotAllowed()
def view_single_post(request, post_id):
'''
GET: To get a single visiable post by given post id
'''
if request.method == 'GET':
try:
if not 'HTTP_X_USER_ID' in request.META.keys():
return HttpResponseForbidden(
"Who's requesting posts? Put author info in request headers under 'x-user-id'"
)
requester_url = request.META.get('HTTP_X_USER_ID')
#Get the post specified by request
post = Post.objects.filter(id=post_id)
if not post.exists():
return HttpResponseNotFound("Post Not Found.")
post = post[0]
#Case 1: User has visibility
if checkVisibility(requester_url, post):
serializer = PostSerializer(post)
response = {}
response['query'] = 'posts'
#response['count'] = 1
response['post'] = serializer.data
return Response(response)
#Case 2: User does not have visibility
else:
return HttpResponseForbidden(
b"You dont have visibility to this post.")
#Server error when handling request
except Exception as e:
return HttpResponseServerError(e)
#Ask for a FOAF post
if request.method == 'POST':
try:
#Parse data from request
data = json.loads(request.body)
#Validate request body
if not ('postid' in data.keys() and 'url' in data.keys()
and 'author' in data.keys() and 'friends' in data.keys()):
return Response("Invalid request data", status=403)
#Get the post specified by request
post = Post.objects.filter(id=data['postid'])
if not post.exists():
return HttpResponseNotFound("Post Not Found.")
post = post[0]
if not post.visibility == "FOAF":
return HttpResponseForbidden(
"Please POST to this API view only for FOAF post request.")
#Frist Check -> get friends of requestor A from A's server
friends = data['friends']
node = ServerNode.objects.filter(
host_url__startswith=data['author']['host'])
if not node.exists():
return HttpResponseForbidden(
"Requestor does not have visiblity of post.")
node = node[0]
friendsRequestor = checkRemoteFriendslist(node,
data['author']['url'],
friends)
# friendsRequestor = friends
#Second check -> get friends of post author B from B's server
friendsAuthor = []
friends = getAllFriends(post.author.id)
for friend in friends:
friendsAuthor.append(friend.url)
#Third check -> get friendslist A intersects friendslist B as common friends
#check until one of these common friends' servers confirm that A is a friend.
friendsInCommom = list(set(friendsAuthor) & set(friendsRequestor))
hasVisibility = False
for friend_url in friendsInCommom:
host = friend_url.split('author')[0]
node = ServerNode.objects.filter(host_url__startswith=host)
if node.exists():
node = node[0]
#once it is verified via the 3 hosts -> approve request.
if checkRemoteFriendship(node, friend_url,
data['author']['url']):
hasVisibility = True
break
#Case 1: User has visibility
if hasVisibility:
serializer = PostSerializer(post)
response = {}
response['query'] = 'posts'
response['post'] = serializer.data
return Response(response)
#Case 2: User does not have visibility
else:
return HttpResponseForbidden(
"You dont have visibility to this post.")
except Exception as e:
print(e)
return HttpResponseServerError(e)
#Method not allowed
return HttpResponseNotAllowed()
