Misago/misago/users/api/users.py

from django.conf import settings
from django.contrib.auth import get_user_model
from django.core.exceptions import PermissionDenied
from django.db import transaction
from django.db.models import F
from django.utils.translation import ugettext as _

from rest_framework import mixins, status, viewsets
from rest_framework.decorators import detail_route, list_route
from rest_framework.parsers import FormParser, JSONParser, MultiPartParser
from rest_framework.response import Response

from misago.acl import add_acl
from misago.categories.models import Category
from misago.core.cache import cache
from misago.core.shortcuts import get_int_or_404, get_object_or_404
from misago.threads.moderation.posts import hide_post
from misago.threads.moderation.threads import hide_thread

from ..bans import get_user_ban
from ..forms.options import ForumOptionsForm
from ..online.utils import get_user_status
from ..permissions.delete import allow_delete_user
from ..permissions.moderation import allow_moderate_avatar, allow_rename_user
from ..permissions.profiles import allow_browse_users_list, allow_follow_user, allow_see_ban_details
from ..rest_permissions import BasePermission, IsAuthenticatedOrReadOnly, UnbannedAnonOnly
from ..serializers import BanDetailsSerializer, UserProfileSerializer, UserSerializer
from ..viewmodels import UserPosts, UserThreads
from .userendpoints.avatar import avatar_endpoint, moderate_avatar_endpoint
from .userendpoints.changeemail import change_email_endpoint
from .userendpoints.changepassword import change_password_endpoint
from .userendpoints.create import create_endpoint
from .userendpoints.list import list_endpoint
from .userendpoints.signature import signature_endpoint
from .userendpoints.username import moderate_username_endpoint, username_endpoint


class UserViewSetPermission(BasePermission):
    def has_permission(self, request, view):
        if view.action == 'create':
            policy = UnbannedAnonOnly()
        else:
            policy = IsAuthenticatedOrReadOnly()
        return policy.has_permission(request, view)


def allow_self_only(user, pk, message):
    if user.is_anonymous():
        raise PermissionDenied(_("You have to sign in to perform this action."))
    if user.pk != int(pk):
        raise PermissionDenied(message)


class UserViewSet(viewsets.GenericViewSet):
    permission_classes = (UserViewSetPermission,)
    parser_classes=(FormParser, JSONParser, MultiPartParser)
    queryset = get_user_model().objects

    def get_queryset(self):
        relations = ('rank', 'online_tracker', 'ban_cache')
        return self.queryset.select_related(*relations)

    def get_user(self, pk):
        return get_object_or_404(self.get_queryset(), pk=get_int_or_404(pk))

    def list(self, request):
        allow_browse_users_list(request.user)
        return list_endpoint(request)

    def create(self, request):
        return create_endpoint(request)

    def retrieve(self, request, pk=None):
        profile = self.get_user(pk)

        add_acl(request.user, profile)
        profile.status = get_user_status(request.user, profile)

        serializer = UserProfileSerializer(profile, context={'user': request.user})
        return Response(serializer.data)

    @detail_route(methods=['get', 'post'])
    def avatar(self, request, pk=None):
        get_int_or_404(pk)
        allow_self_only(request.user, pk, _("You can't change other users avatars."))

        return avatar_endpoint(request)

    @detail_route(methods=['post'])
    def forum_options(self, request, pk=None):
        get_int_or_404(pk)
        allow_self_only(request.user, pk, _("You can't change other users options."))

        form = ForumOptionsForm(request.data, instance=request.user)
        if form.is_valid():
            form.save()
            return Response({
                'detail': _("Your forum options have been changed.")
            })
        else:
            return Response(form.errors, status=status.HTTP_400_BAD_REQUEST)

    @detail_route(methods=['get', 'post'])
    def username(self, request, pk=None):
        get_int_or_404(pk)
        allow_self_only(request.user, pk, _("You can't change other users names."))

        return username_endpoint(request)

    @detail_route(methods=['get', 'post'])
    def signature(self, request, pk=None):
        get_int_or_404(pk)
        allow_self_only(request.user, pk, _("You can't change other users signatures."))

        return signature_endpoint(request)

    @detail_route(methods=['post'])
    def change_password(self, request, pk=None):
        get_int_or_404(pk)
        allow_self_only(request.user, pk, _("You can't change other users passwords."))

        return change_password_endpoint(request)

    @detail_route(methods=['post'])
    def change_email(self, request, pk=None):
        get_int_or_404(pk)
        allow_self_only(request.user, pk, _("You can't change other users e-mail addresses."))

        return change_email_endpoint(request)

    @detail_route(methods=['post'])
    def follow(self, request, pk=None):
        profile = self.get_user(pk)
        allow_follow_user(request.user, profile)

        profile_followers = profile.followers

        with transaction.atomic():
            if request.user.is_following(profile):
                request.user.follows.remove(profile)
                followed = False

                profile_followers -= 1
                profile.followers = F('followers') - 1
                request.user.following = F('following') - 1
            else:
                request.user.follows.add(profile)
                followed = True

                profile_followers += 1
                profile.followers = F('followers') + 1
                request.user.following = F('following') + 1

            profile.save(update_fields=['followers'])
            request.user.save(update_fields=['following'])

            return Response({
                'is_followed': followed,
                'followers': profile_followers
            })

    @detail_route()
    def ban(self, request, pk=None):
        profile = self.get_user(pk)
        allow_see_ban_details(request.user, profile)

        ban = get_user_ban(profile)
        if ban:
            return Response(BanDetailsSerializer(ban).data)
        else:
            return Response({})

    @detail_route(methods=['get', 'post'])
    def moderate_avatar(self, request, pk=None):
        profile = self.get_user(pk)
        allow_moderate_avatar(request.user, profile)

        return moderate_avatar_endpoint(request, profile)

    @detail_route(methods=['get', 'post'])
    def moderate_username(self, request, pk=None):
        profile = self.get_user(pk)
        allow_rename_user(request.user, profile)

        return moderate_username_endpoint(request, profile)

    @detail_route(methods=['get', 'post'])
    def delete(self, request, pk=None):
        profile = self.get_user(pk)
        allow_delete_user(request.user, profile)

        if request.method == 'POST':
            with transaction.atomic():
                profile.lock()

                if request.data.get('with_content'):
                    profile.delete_content()
                else:
                    categories_to_sync = set()

                    threads = profile.thread_set.select_related('category', 'first_post')
                    for thread in threads.filter(is_hidden=False).iterator():
                        categories_to_sync.add(thread.category_id)
                        hide_thread(request, thread)

                    posts = profile.post_set.select_related('category', 'thread', 'thread__category')
                    for post in posts.filter(is_hidden=False).iterator():
                        categories_to_sync.add(post.category_id)
                        hide_post(request.user, post)
                        post.thread.synchronize()
                        post.thread.save()

                    categories = Category.objects.filter(id__in=categories_to_sync)
                    for category in categories.iterator():
                        category.synchronize()
                        category.save()

                profile.delete()

        return Response({'detail': 'ok'})

    @detail_route(methods=['get'])
    def threads(self, request, pk=None):
        profile = self.get_user(pk)

        page = get_int_or_404(request.query_params.get('page', 0))
        if page == 1:
            page = 0 # api allows explicit first page

        feed = UserThreads(request, profile, page)

        return Response(feed.get_frontend_context())

    @detail_route(methods=['get'])
    def posts(self, request, pk=None):
        profile = self.get_user(pk)

        page = get_int_or_404(request.query_params.get('page', 0))
        if page == 1:
            page = 0 # api allows explicit first page

        feed = UserPosts(request, profile, page)

        return Response(feed.get_frontend_context())