96 lines
2.8 KiB
Python
96 lines
2.8 KiB
Python
from __future__ import unicode_literals
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from datetime import date
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import logging
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import uuid
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from django.core.urlresolvers import reverse
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from django.db import models
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from django.utils.encoding import python_2_unicode_compatible
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from django.utils.translation import ugettext_lazy as _
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from model_utils.managers import InheritanceManager
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from django_gpg.exceptions import DecryptionError, VerificationError
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from django_gpg.models import Key
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from documents.models import DocumentVersion
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from .managers import EmbeddedSignatureManager, DetachedSignatureManager
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from .runtime import storage_backend
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logger = logging.getLogger(__name__)
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def upload_to(*args, **kwargs):
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return unicode(uuid.uuid4())
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@python_2_unicode_compatible
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class SignatureBaseModel(models.Model):
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document_version = models.ForeignKey(
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DocumentVersion, editable=False, related_name='signatures',
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verbose_name=_('Document version')
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)
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# Basic fields
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date = models.DateField(
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blank=True, editable=False, null=True, verbose_name=_('Date signed')
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)
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key_id = models.CharField(max_length=40, verbose_name=_('Key ID'))
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# With proper key
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signature_id = models.CharField(
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blank=True, editable=False, null=True, max_length=64,
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verbose_name=_('Signature ID')
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)
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public_key_fingerprint = models.CharField(
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blank=True, editable=False, null=True, max_length=40, unique=True,
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verbose_name=_('Public key fingerprint')
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)
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objects = InheritanceManager()
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class Meta:
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verbose_name = _('Document version signature')
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verbose_name_plural = _('Document version signatures')
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def __str__(self):
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return self.signature_id or '{} - {}'.format(self.date, self.key_id)
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def get_absolute_url(self):
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return reverse(
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'document_signatures:document_version_signature_detail',
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args=(self.pk,)
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)
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@property
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def is_detached(self):
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return hasattr(self, 'signature_file')
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@property
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def is_embedded(self):
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return not hasattr(self, 'signature_file')
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class EmbeddedSignature(SignatureBaseModel):
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objects = EmbeddedSignatureManager()
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class Meta:
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verbose_name = _('Document version embedded signature')
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verbose_name_plural = _('Document version embedded signatures')
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class DetachedSignature(SignatureBaseModel):
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signature_file = models.FileField(
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blank=True, null=True, storage=storage_backend, upload_to=upload_to,
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verbose_name=_('Signature file')
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)
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objects = DetachedSignatureManager()
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class Meta:
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verbose_name = _('Document version detached signature')
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verbose_name_plural = _('Document version detached signatures')
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def delete(self, *args, **kwargs):
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self.signature_file.storage.delete(self.signature_file.name)
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super(DetachedSignature, self).delete(*args, **kwargs)
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