def validate(self, data):
"""
Validate file by size and by all checksums provided.
Args:
data (:class:`django.http.QueryDict`): QueryDict mapping Artifact model fields to their
values
Raises:
:class:`rest_framework.exceptions.ValidationError`: When the expected file size or any
of the checksums don't match their actual values.
"""
if 'size' in data:
if data['file'].size != int(data['size']):
raise serializers.ValidationError(_("The size did not match actual size of file."))
else:
data['size'] = data['file'].size
for algorithm in hashlib.algorithms_guaranteed:
if algorithm in models.Artifact.DIGEST_FIELDS:
digest = data['file'].hashers[algorithm].hexdigest()
if algorithm in data and digest != data[algorithm]:
raise serializers.ValidationError(_("The %s checksum did not match.")
% algorithm)
else:
data[algorithm] = digest
if algorithm in UNIQUE_ALGORITHMS:
validator = UniqueValidator(models.Artifact.objects.all(),
message=_("{0} checksum must be "
"unique.").format(algorithm))
validator.field_name = algorithm
validator.instance = None
validator(digest)
return data
