def unlock(request, app, model, id):
# Users who don't have exclusive access to an object anymore may still
# request we unlock an object. This happens e.g. when a user navigates
# away from an edit screen that's been open for very long.
# When this happens, LockableModel.unlock_for will throw an exception,
# and we just ignore the request.
# That way, any new lock that may since have been put in place by another
# user won't get accidentally overwritten.
try:
ct = get_ct(app, model)
lock = Lock.objects.get(content_type=ct, object_id=id)
lock.delete()
return HttpResponse(status=200)
except:
return HttpResponse(status=403)
def is_locked(request, app, model, id):
data = {'is_active': False,
'applies': False,
'for_user': None}
ct = get_ct(app, model)
if ct is None:
return HttpResponse(status=404)
try:
obj = Lock.objects.get(content_type=ct, object_id=id)
except Lock.DoesNotExist:
pass
else:
data['is_active'] = obj.is_locked
data['for_user'] = getattr(obj.locked_by, 'username', None)
data['applies'] = obj.lock_applies_to(request.user)
response = simplejson.dumps(data)
return HttpResponse(response, mimetype='application/json')
def lock(request, app, model, id):
# TODO: What do we do if the model doesn't exist? Edge case
# for later
ct = get_ct(app, model)
if ct is None:
return HttpResponse(status=404)
try:
obj = Lock.objects.get(content_type=ct, object_id=id)
except Lock.DoesNotExist:
obj = Lock(content_type=ct, object_id=id)
try:
obj.lock_for(request.user)
except ObjectLockedError:
# The user tried to overwrite an existing lock by another user.
# No can do, pal!
return HttpResponse(status=403)
obj.save()
return HttpResponse(status=200)