97 lines
4.1 KiB
Python
97 lines
4.1 KiB
Python
from __future__ import absolute_import
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import logging
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try:
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from cStringIO import StringIO
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except ImportError:
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from StringIO import StringIO
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from django.utils.translation import ugettext_lazy as _
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#from django.db.models.signals import post_save
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#from django.dispatch import receiver
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from documents.models import Document, DocumentVersion
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from navigation.api import bind_links, Link
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from django_gpg.runtime import gpg
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from django_gpg.exceptions import GPGDecryptionError
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from acls.api import class_permissions
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from .models import DocumentVersionSignature
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from .permissions import (
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PERMISSION_DOCUMENT_VERIFY, PERMISSION_SIGNATURE_UPLOAD,
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PERMISSION_SIGNATURE_DOWNLOAD, PERMISSION_SIGNATURE_DELETE
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)
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logger = logging.getLogger(__name__)
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def has_embedded_signature(context):
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return DocumentVersionSignature.objects.has_embedded_signature(context['object'])
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def doesnt_have_detached_signature(context):
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return DocumentVersionSignature.objects.has_detached_signature(context['object']) == False
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def document_pre_open_hook(descriptor, instance):
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if DocumentVersionSignature.objects.has_embedded_signature(instance.document):
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# If it has an embedded signature decrypt
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try:
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result = gpg.decrypt_file(descriptor, close_descriptor=False)
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# gpg return a string, turn it into a file like object
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except GPGDecryptionError:
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# At least return the original raw content
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descriptor.seek(0)
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return descriptor
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else:
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descriptor.close()
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return StringIO(result.data)
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else:
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# It no embedded signature pass along
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# Doing this single DB lookup avoids trying to decrypt non signed
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# files always, which could result in slow down for big non signed
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# files
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#descriptor.seek(0)
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return descriptor
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#try:
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# result = gpg.decrypt_file(descriptor, close_descriptor=False)
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# # gpg return a string, turn it into a file like object
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#except GPGDecryptionError:
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# # At least return the original raw content
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# descriptor.seek(0)
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# return descriptor
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#else:
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# descriptor.close()
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# return StringIO(result.data)
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def document_post_save_hook(instance):
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if not instance.pk:
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document_signature, created = DocumentVersionSignature.objects.get_or_create(
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document_version=instance.latest_version,
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)
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#DocumentVersionSignature.objects.update_signed_state(instance.document)
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#@receiver(post_save, dispatch_uid='check_document_signature_state', sender=DocumentVersion)
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#def check_document_signature_state(sender, instance, **kwargs):
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# if kwargs.get('created', False):
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# DocumentVersionSignature.objects.signature_state(instance.document)
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document_signature_upload = Link(text=_(u'upload signature'), view='document_signature_upload', args='object.pk', sprite='pencil_add', permissions=[PERMISSION_SIGNATURE_UPLOAD], conditional_disable=has_embedded_signature)
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document_signature_download = Link(text=_(u'download signature'), view='document_signature_download', args='object.pk', sprite='disk', permissions=[PERMISSION_SIGNATURE_DOWNLOAD], conditional_disable=doesnt_have_detached_signature)
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document_signature_delete = Link(text=_(u'delete signature'), view='document_signature_delete', args='object.pk', sprite='pencil_delete', permissions=[PERMISSION_SIGNATURE_DELETE], conditional_disable=doesnt_have_detached_signature)
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document_verify = Link(text=_(u'signatures'), view='document_verify', args='object.pk', sprite='text_signature', permissions=[PERMISSION_DOCUMENT_VERIFY])
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bind_links([Document], [document_verify], menu_name='form_header')
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bind_links(['document_verify', 'document_signature_upload', 'document_signature_download', 'document_signature_delete'], [document_signature_upload, document_signature_download, document_signature_delete], menu_name='sidebar')
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DocumentVersion.register_pre_open_hook(1, document_pre_open_hook)
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DocumentVersion.register_post_save_hook(1, document_post_save_hook)
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class_permissions(Document, [
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PERMISSION_DOCUMENT_VERIFY, PERMISSION_SIGNATURE_UPLOAD,
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PERMISSION_SIGNATURE_DOWNLOAD, PERMISSION_SIGNATURE_DELETE
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])
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