65 lines
2.1 KiB
Python
65 lines
2.1 KiB
Python
import logging
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from django.db import models
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from django_gpg.runtime import gpg
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from django_gpg.exceptions import GPGVerificationError
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logger = logging.getLogger(__name__)
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class DocumentVersionSignatureManager(models.Manager):
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def get_document_signature(self, document):
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document_signature, created = self.model.objects.get_or_create(
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document_version=document.latest_version,
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)
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return document_signature
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def add_detached_signature(self, document, detached_signature):
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document_signature = self.get_document_signature(document)
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if document_signature.has_embedded_signature:
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raise Exception('document already has an embedded signature')
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else:
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if document_signature.signature_file:
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logger.debug('Existing detached signature')
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document_signature.delete_detached_signature()
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document_signature.signature_file = None
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document_signature.save()
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document_signature.signature_file = detached_signature
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document_signature.save()
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def has_detached_signature(self, document):
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document_signature = self.get_document_signature(document)
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if document_signature.signature_file:
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return True
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else:
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return False
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def has_embedded_signature(self, document):
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logger.debug('document: %s' % document)
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document_signature = self.get_document_signature(document)
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return document_signature.has_embedded_signature
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def detached_signature(self, document):
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document_signature = self.get_document_signature(document)
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return document_signature.signature_file.storage.open(document_signature.signature_file.path)
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def verify_signature(self, document):
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if self.has_detached_signature(document):
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logger.debug('has detached signature')
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args = (document.open(raw=True), self.detached_signature(document))
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else:
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args = (document.open(raw=True),)
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try:
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return gpg.verify_w_retry(*args)
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except GPGVerificationError:
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return None
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