88 lines
3.7 KiB
Python
88 lines
3.7 KiB
Python
from django.http import HttpResponseForbidden, HttpResponseNotFound
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from django.views.static import serve
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from ..utils.auth import has_perm
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from ..utils.rest_api import ModelViewSet, ValidationError
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from .access_permissions import MediafileAccessPermissions
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from .models import Mediafile
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# Viewsets for the REST API
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class MediafileViewSet(ModelViewSet):
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"""
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API endpoint for mediafile objects.
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There are the following views: metadata, list, retrieve, create,
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partial_update, update and destroy.
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"""
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access_permissions = MediafileAccessPermissions()
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queryset = Mediafile.objects.all()
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def check_view_permissions(self):
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"""
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Returns True if the user has required permissions.
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"""
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if self.action in ('list', 'retrieve'):
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result = self.get_access_permissions().check_permissions(self.request.user)
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elif self.action == 'metadata':
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result = has_perm(self.request.user, 'mediafiles.can_see')
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elif self.action == 'create':
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result = (has_perm(self.request.user, 'mediafiles.can_see') and
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has_perm(self.request.user, 'mediafiles.can_upload'))
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elif self.action in ('partial_update', 'update'):
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result = (has_perm(self.request.user, 'mediafiles.can_see') and
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has_perm(self.request.user, 'mediafiles.can_upload') and
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has_perm(self.request.user, 'mediafiles.can_manage'))
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elif self.action == 'destroy':
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result = (has_perm(self.request.user, 'mediafiles.can_see') and
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has_perm(self.request.user, 'mediafiles.can_manage'))
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else:
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result = False
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return result
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def create(self, request, *args, **kwargs):
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"""
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Customized view endpoint to upload a new file.
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"""
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# Check permission to check if the uploader has to be changed.
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uploader_id = self.request.data.get('uploader_id')
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if (uploader_id and
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not has_perm(request.user, 'mediafiles.can_manage') and
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str(self.request.user.pk) != str(uploader_id)):
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self.permission_denied(request)
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if not self.request.data.get('mediafile'):
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raise ValidationError({'detail': 'You forgot to provide a file.'})
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return super().create(request, *args, **kwargs)
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def destroy(self, request, *args, **kwargs):
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"""
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Customized view endpoint to delete uploaded files.
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Does also delete the file from filesystem.
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"""
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# To avoid Django calling save() and triggering autoupdate we do not
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# use the builtin method mediafile.mediafile.delete() but call
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# mediafile.mediafile.storage.delete(...) directly. This may have
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# unattended side effects so be careful especially when accessing files
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# on server via Django methods (file, open(), save(), ...).
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mediafile = self.get_object()
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mediafile.mediafile.storage.delete(mediafile.mediafile.name)
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return super().destroy(request, *args, **kwargs)
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def protected_serve(request, path, document_root=None, show_indexes=False):
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try:
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mediafile = Mediafile.objects.get(mediafile=path)
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except Mediafile.DoesNotExist:
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return HttpResponseNotFound(content="Not found.")
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can_see = has_perm(request.user, 'mediafiles.can_see')
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is_special_file = mediafile.is_logo() or mediafile.is_font()
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is_hidden_but_no_perms = mediafile.hidden and not has_perm(request.user, 'mediafiles.can_see_hidden')
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if not is_special_file and (not can_see or is_hidden_but_no_perms):
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return HttpResponseForbidden(content="Forbidden.")
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else:
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return serve(request, path, document_root, show_indexes)
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