from rest_framework import permissions

class IsOwnerOrReadOnly(permissions.BasePermission):
    """
    Custom permission to only allow owners/authors of the object to edit it.
    """
    def has_object_permission(self, request, view, obj):
    # Read permissions are allowed to any request,
    # so we'll always allow GET, HEAD or OPTIONS requests.
        if request.method in permissions.SAFE_METHODS:
            return True

        # Write permissions are only allowed to the owner of the snippet.
        return obj.owner == request.user