773 lines
24 KiB
Python
773 lines
24 KiB
Python
from __future__ import unicode_literals
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import base64
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import hashlib
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import logging
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import os
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import uuid
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from django.contrib.auth.models import User
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from django.core.files import File
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from django.core.urlresolvers import reverse
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from django.db import models, transaction
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from django.utils.encoding import python_2_unicode_compatible
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from django.utils.timezone import now
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from django.utils.translation import ugettext, ugettext_lazy as _
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from common.literals import TIME_DELTA_UNIT_CHOICES
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from common.settings import setting_temporary_directory
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from converter import (
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converter_class, TransformationResize, TransformationRotate,
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TransformationZoom
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)
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from converter.exceptions import (
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InvalidOfficeFormat, PageCountError
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)
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from converter.literals import DEFAULT_ZOOM_LEVEL, DEFAULT_ROTATION
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from converter.models import Transformation
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from mimetype.api import get_mimetype
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from .events import (
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event_document_create, event_document_new_version,
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event_document_version_revert
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)
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from .literals import DEFAULT_DELETE_PERIOD, DEFAULT_DELETE_TIME_UNIT
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from .managers import (
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DocumentManager, DocumentTypeManager, PassthroughManager,
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RecentDocumentManager, TrashCanManager
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)
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from .runtime import cache_storage_backend, storage_backend
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from .settings import (
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setting_display_size, setting_language, setting_language_choices,
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setting_zoom_max_level, setting_zoom_min_level
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)
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from .signals import (
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post_document_created, post_document_type_change, post_version_upload
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)
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# document image cache name hash function
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HASH_FUNCTION = lambda x: hashlib.sha256(x).hexdigest()
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logger = logging.getLogger(__name__)
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def UUID_FUNCTION(*args, **kwargs):
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return unicode(uuid.uuid4())
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@python_2_unicode_compatible
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class DocumentType(models.Model):
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"""
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Define document types or classes to which a specific set of
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properties can be attached
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"""
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label = models.CharField(
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max_length=32, unique=True, verbose_name=_('Label')
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)
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trash_time_period = models.PositiveIntegerField(
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blank=True, help_text=_(
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'Amount of time after which documents of this type will be '
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'moved to the trash.'
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), null=True, verbose_name=_('Trash time period')
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)
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trash_time_unit = models.CharField(
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blank=True, choices=TIME_DELTA_UNIT_CHOICES, null=True, max_length=8,
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verbose_name=_('Trash time unit')
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)
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delete_time_period = models.PositiveIntegerField(
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default=DEFAULT_DELETE_PERIOD, help_text=_(
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'Amount of time after which documents of this type in the trash '
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'will be deleted.'
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), verbose_name=_('Delete time period')
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)
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delete_time_unit = models.CharField(
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choices=TIME_DELTA_UNIT_CHOICES, default=DEFAULT_DELETE_TIME_UNIT,
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max_length=8, verbose_name=_('Delete time unit')
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)
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objects = DocumentTypeManager()
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def __str__(self):
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return self.label
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def delete(self, *args, **kwargs):
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for document in Document.passthrough.filter(document_type=self):
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document.delete(to_trash=False)
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return super(DocumentType, self).delete(*args, **kwargs)
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def new_document(self, file_object, label=None, description=None, language=None, _user=None):
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try:
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with transaction.atomic():
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document = self.documents.create(
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description=description or '',
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label=label or unicode(file_object),
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language=language or setting_language.value
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)
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document.save(_user=_user)
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document.new_version(file_object=file_object, _user=_user)
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return document
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except Exception as exception:
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logger.critical(
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'Unexpected exception while trying to create new document '
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'"%s" from document type "%s"; %s',
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label or unicode(file_object), self, exception
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)
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raise
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class Meta:
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ordering = ('label',)
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verbose_name = _('Document type')
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verbose_name_plural = _('Documents types')
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@python_2_unicode_compatible
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class Document(models.Model):
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"""
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Defines a single document with it's fields and properties
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"""
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uuid = models.CharField(
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default=UUID_FUNCTION, editable=False, max_length=48
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)
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document_type = models.ForeignKey(
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DocumentType, related_name='documents',
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verbose_name=_('Document type')
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)
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label = models.CharField(
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blank=True, db_index=True, default='', max_length=255,
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help_text=_('The name of the document'), verbose_name=_('Label')
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)
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description = models.TextField(
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blank=True, default='', verbose_name=_('Description')
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)
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date_added = models.DateTimeField(
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auto_now_add=True, db_index=True, verbose_name=_('Added')
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)
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language = models.CharField(
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blank=True, choices=setting_language_choices.value,
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default=setting_language.value, max_length=8,
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verbose_name=_('Language')
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)
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in_trash = models.BooleanField(
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default=False, editable=False, verbose_name=_('In trash?')
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)
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#TODO: set editable to False
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deleted_date_time = models.DateTimeField(
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blank=True, editable=True, null=True,
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verbose_name=_('Date and time trashed')
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)
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is_stub = models.BooleanField(
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default=True, editable=False, verbose_name=_('Is stub?')
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)
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objects = DocumentManager()
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passthrough = PassthroughManager()
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trash = TrashCanManager()
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class Meta:
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verbose_name = _('Document')
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verbose_name_plural = _('Documents')
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ordering = ('-date_added',)
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def set_document_type(self, document_type, force=False):
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has_changed = self.document_type != document_type
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self.document_type = document_type
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self.save()
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if has_changed or force:
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post_document_type_change.send(
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sender=self.__class__, instance=self
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)
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def invalidate_cache(self):
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for document_version in self.versions.all():
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document_version.invalidate_cache()
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def __str__(self):
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return self.label or ugettext('Document stub, id: %d') % self.pk
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def get_absolute_url(self):
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return reverse('documents:document_preview', args=[self.pk])
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def save(self, *args, **kwargs):
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user = kwargs.pop('_user', None)
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new_document = not self.pk
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super(Document, self).save(*args, **kwargs)
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if new_document:
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if user:
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self.add_as_recent_document_for_user(user)
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event_document_create.commit(actor=user, target=self)
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else:
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event_document_create.commit(target=self)
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def add_as_recent_document_for_user(self, user):
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RecentDocument.objects.add_document_for_user(user, self)
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def delete(self, *args, **kwargs):
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to_trash = kwargs.pop('to_trash', True)
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if not self.in_trash and to_trash:
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self.in_trash = True
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self.deleted_date_time = now()
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self.save()
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else:
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for version in self.versions.all():
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version.delete()
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return super(Document, self).delete(*args, **kwargs)
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def restore(self):
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self.in_trash = False
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self.save()
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@property
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def size(self):
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return self.latest_version.size
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def new_version(self, file_object, comment=None, _user=None):
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logger.info('Creating new document version for document: %s', self)
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document_version = DocumentVersion(
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document=self, comment=comment or '', file=File(file_object)
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)
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document_version.save(_user=_user)
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logger.info('New document version queued for document: %s', self)
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return document_version
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# Proxy methods
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def open(self, *args, **kwargs):
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"""
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Return a file descriptor to a document's file irrespective of
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the storage backend
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"""
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return self.latest_version.open(*args, **kwargs)
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def save_to_file(self, *args, **kwargs):
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return self.latest_version.save_to_file(*args, **kwargs)
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def exists(self):
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"""
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Returns a boolean value that indicates if the document's
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latest version file exists in storage
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"""
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return self.latest_version.exists()
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# Compatibility methods
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@property
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def file_mimetype(self):
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return self.latest_version.mimetype
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# TODO: rename to file_encoding
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@property
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def file_mime_encoding(self):
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return self.latest_version.encoding
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@property
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def date_updated(self):
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return self.latest_version.timestamp
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@property
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def checksum(self):
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return self.latest_version.checksum
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@property
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def signature_state(self):
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return self.latest_version.signature_state
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@property
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def pages(self):
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try:
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return self.latest_version.pages
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except AttributeError:
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# Document has no version yet
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return 0
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@property
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def page_count(self):
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return self.latest_version.page_count
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@property
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def latest_version(self):
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return self.versions.order_by('timestamp').last()
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# TODO: look to remove, only used by the OCR parser
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def document_save_to_temp_dir(self, filename, buffer_size=1024 * 1024):
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temporary_path = os.path.join(
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setting_temporary_directory.value, filename
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)
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return self.save_to_file(temporary_path, buffer_size)
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class DeletedDocument(Document):
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objects = TrashCanManager()
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class Meta:
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proxy = True
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@python_2_unicode_compatible
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class DocumentVersion(models.Model):
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"""
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Model that describes a document version and its properties
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"""
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_pre_open_hooks = {}
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_post_save_hooks = {}
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@classmethod
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def register_pre_open_hook(cls, order, func):
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cls._pre_open_hooks[order] = func
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@classmethod
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def register_post_save_hook(cls, order, func):
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cls._post_save_hooks[order] = func
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document = models.ForeignKey(
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Document, related_name='versions', verbose_name=_('Document')
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)
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timestamp = models.DateTimeField(
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auto_now_add=True, db_index=True, verbose_name=_('Timestamp')
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)
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comment = models.TextField(
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blank=True, default='', verbose_name=_('Comment')
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)
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# File related fields
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file = models.FileField(
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storage=storage_backend, upload_to=UUID_FUNCTION,
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verbose_name=_('File')
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)
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mimetype = models.CharField(
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blank=True, editable=False, max_length=255, null=True
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)
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encoding = models.CharField(
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blank=True, editable=False, max_length=64, null=True
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)
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checksum = models.TextField(
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blank=True, editable=False, null=True, verbose_name=_('Checksum')
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)
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class Meta:
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verbose_name = _('Document version')
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verbose_name_plural = _('Document version')
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def __str__(self):
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return '{0} - {1}'.format(self.document, self.timestamp)
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def save(self, *args, **kwargs):
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"""
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Overloaded save method that updates the document version's checksum,
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mimetype, and page count when created
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"""
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user = kwargs.pop('_user', None)
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new_document_version = not self.pk
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if new_document_version:
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logger.info('Creating new version for document: %s', self.document)
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try:
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with transaction.atomic():
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super(DocumentVersion, self).save(*args, **kwargs)
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for key in sorted(DocumentVersion._post_save_hooks):
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DocumentVersion._post_save_hooks[key](self)
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if new_document_version:
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# Only do this for new documents
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self.update_checksum(save=False)
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self.update_mimetype(save=False)
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self.save()
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self.update_page_count(save=False)
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logger.info(
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'New document version "%s" created for document: %s',
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self, self.document
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)
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self.document.is_stub = False
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if not self.document.label:
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self.document.label = unicode(self.file)
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self.document.save()
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except Exception as exception:
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logger.error(
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'Error creating new document version for document "%s"; %s',
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self.document, exception
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)
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raise
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else:
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if new_document_version:
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event_document_new_version.commit(
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actor=user, target=self.document
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)
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post_version_upload.send(sender=self.__class__, instance=self)
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if tuple(self.document.versions.all()) == (self,):
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post_document_created.send(
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sender=self.document.__class__, instance=self.document
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)
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def invalidate_cache(self):
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cache_storage_backend.delete(self.cache_filename)
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for page in self.pages.all():
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page.invalidate_cache()
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def update_checksum(self, save=True):
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"""
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Open a document version's file and update the checksum field using
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the user provided checksum function
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"""
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if self.exists():
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source = self.open()
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self.checksum = unicode(HASH_FUNCTION(source.read()))
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source.close()
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if save:
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self.save()
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def update_page_count(self, save=True):
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try:
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with self.open() as file_object:
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converter = converter_class(
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file_object=file_object, mime_type=self.mimetype
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)
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detected_pages = converter.get_page_count()
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except PageCountError:
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# If converter backend doesn't understand the format,
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# use 1 as the total page count
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pass
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else:
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with transaction.atomic():
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self.pages.all().delete()
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for page_number in range(detected_pages):
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DocumentPage.objects.create(
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document_version=self, page_number=page_number + 1
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)
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# TODO: is this needed anymore
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if save:
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self.save()
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return detected_pages
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def revert(self, user=None):
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"""
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Delete the subsequent versions after this one
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"""
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logger.info(
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'Reverting to document document: %s to version: %s',
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self.document, self
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)
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event_document_version_revert.commit(actor=user, target=self.document)
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for version in self.document.versions.filter(timestamp__gt=self.timestamp):
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version.delete()
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def update_mimetype(self, save=True):
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"""
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Read a document verions's file and determine the mimetype by calling
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the get_mimetype wrapper
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"""
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if self.exists():
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try:
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with self.open() as file_object:
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self.mimetype, self.encoding = get_mimetype(
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file_object=file_object
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)
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except:
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self.mimetype = ''
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self.encoding = ''
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finally:
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if save:
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self.save()
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def delete(self, *args, **kwargs):
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for page in self.pages.all():
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page.delete()
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self.file.storage.delete(self.file.name)
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return super(DocumentVersion, self).delete(*args, **kwargs)
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def exists(self):
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"""
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Returns a boolean value that indicates if the document's file
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exists in storage
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"""
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return self.file.storage.exists(self.file.name)
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def open(self, raw=False):
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"""
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Return a file descriptor to a document version's file irrespective of
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the storage backend
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"""
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if raw:
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return self.file.storage.open(self.file.name)
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else:
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result = self.file.storage.open(self.file.name)
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for key in sorted(DocumentVersion._pre_open_hooks):
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result = DocumentVersion._pre_open_hooks[key](result, self)
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return result
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def save_to_file(self, filepath, buffer_size=1024 * 1024):
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"""
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Save a copy of the document from the document storage backend
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to the local filesystem
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"""
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input_descriptor = self.open()
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output_descriptor = open(filepath, 'wb')
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while True:
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copy_buffer = input_descriptor.read(buffer_size)
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if copy_buffer:
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output_descriptor.write(copy_buffer)
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else:
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break
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output_descriptor.close()
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input_descriptor.close()
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return filepath
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@property
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def size(self):
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if self.exists():
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return self.file.storage.size(self.file.name)
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else:
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return None
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@property
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def page_count(self):
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return self.pages.count()
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@property
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def uuid(self):
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# Make cache UUID a mix of document UUID, version ID
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return '{}-{}'.format(self.document.uuid, self.pk)
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@property
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def cache_filename(self):
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return 'document-version-{}'.format(self.uuid)
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def get_intermidiate_file(self):
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cache_filename = self.cache_filename
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logger.debug('Intermidiate filename: %s', cache_filename)
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if cache_storage_backend.exists(cache_filename):
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logger.debug('Intermidiate file "%s" found.', cache_filename)
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return cache_storage_backend.open(cache_filename)
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else:
|
|
logger.debug('Intermidiate file "%s" not found.', cache_filename)
|
|
|
|
try:
|
|
converter = converter_class(file_object=self.open())
|
|
pdf_file_object = converter.to_pdf()
|
|
|
|
with cache_storage_backend.open(cache_filename, 'wb+') as file_object:
|
|
for chunk in pdf_file_object:
|
|
file_object.write(chunk)
|
|
|
|
return cache_storage_backend.open(cache_filename)
|
|
except InvalidOfficeFormat:
|
|
return self.open()
|
|
except Exception as exception:
|
|
# Cleanup in case of error
|
|
logger.error(
|
|
'Error creating intermediate file "%s"; %s.',
|
|
cache_filename, exception
|
|
)
|
|
cache_storage_backend.delete(cache_filename)
|
|
raise
|
|
|
|
|
|
@python_2_unicode_compatible
|
|
class DocumentTypeFilename(models.Model):
|
|
"""
|
|
List of filenames available to a specific document type for the
|
|
quick rename functionality
|
|
"""
|
|
document_type = models.ForeignKey(
|
|
DocumentType, related_name='filenames', verbose_name=_('Document type')
|
|
)
|
|
filename = models.CharField(
|
|
db_index=True, max_length=128, verbose_name=_('Filename')
|
|
)
|
|
enabled = models.BooleanField(default=True, verbose_name=_('Enabled'))
|
|
|
|
def __str__(self):
|
|
return self.filename
|
|
|
|
class Meta:
|
|
ordering = ('filename',)
|
|
unique_together = ('document_type', 'filename')
|
|
verbose_name = _('Document type quick rename filename')
|
|
verbose_name_plural = _('Document types quick rename filenames')
|
|
|
|
|
|
@python_2_unicode_compatible
|
|
class DocumentPage(models.Model):
|
|
"""
|
|
Model that describes a document version page
|
|
"""
|
|
document_version = models.ForeignKey(
|
|
DocumentVersion, related_name='pages',
|
|
verbose_name=_('Document version')
|
|
)
|
|
page_number = models.PositiveIntegerField(
|
|
db_index=True, default=1, editable=False, verbose_name=_('Page number')
|
|
)
|
|
|
|
def __str__(self):
|
|
return _(
|
|
'Page %(page_num)d out of %(total_pages)d of %(document)s'
|
|
) % {
|
|
'document': unicode(self.document),
|
|
'page_num': self.page_number,
|
|
'total_pages': self.document_version.pages.count()
|
|
}
|
|
|
|
class Meta:
|
|
ordering = ('page_number',)
|
|
verbose_name = _('Document page')
|
|
verbose_name_plural = _('Document pages')
|
|
|
|
def get_absolute_url(self):
|
|
return reverse('documents:document_page_view', args=[self.pk])
|
|
|
|
def delete(self, *args, **kwargs):
|
|
self.invalidate_cache()
|
|
super(DocumentPage, self).delete(*args, **kwargs)
|
|
|
|
@property
|
|
def siblings(self):
|
|
return DocumentPage.objects.filter(
|
|
document_version=self.document_version
|
|
)
|
|
|
|
# Compatibility methods
|
|
@property
|
|
def document(self):
|
|
return self.document_version.document
|
|
|
|
def invalidate_cache(self):
|
|
cache_storage_backend.delete(self.cache_filename)
|
|
|
|
@property
|
|
def uuid(self):
|
|
"""
|
|
Make cache UUID a mix of version ID and page ID to avoid using stale
|
|
images
|
|
"""
|
|
return '{}-{}'.format(self.document_version.uuid, self.pk)
|
|
|
|
@property
|
|
def cache_filename(self):
|
|
return 'page-cache-{}'.format(self.uuid)
|
|
|
|
def get_image(self, *args, **kwargs):
|
|
as_base64 = kwargs.pop('as_base64', False)
|
|
transformations = kwargs.pop('transformations', [])
|
|
size = kwargs.pop('size', setting_display_size.value)
|
|
rotation = int(kwargs.pop('rotation', DEFAULT_ROTATION) or DEFAULT_ROTATION)
|
|
zoom_level = int(kwargs.pop('zoom', DEFAULT_ZOOM_LEVEL) or DEFAULT_ZOOM_LEVEL)
|
|
|
|
if zoom_level < setting_zoom_min_level.value:
|
|
zoom_level = setting_zoom_min_level.value
|
|
|
|
if zoom_level > setting_zoom_max_level.value:
|
|
zoom_level = setting_zoom_max_level.value
|
|
|
|
rotation = rotation % 360
|
|
|
|
cache_filename = self.cache_filename
|
|
logger.debug('Page cache filename: %s', cache_filename)
|
|
|
|
if cache_storage_backend.exists(cache_filename):
|
|
logger.debug('Page cache file "%s" found', cache_filename)
|
|
converter = converter_class(
|
|
file_object=cache_storage_backend.open(cache_filename)
|
|
)
|
|
|
|
converter.seek(0)
|
|
else:
|
|
logger.debug('Page cache file "%s" not found', cache_filename)
|
|
|
|
try:
|
|
converter = converter_class(
|
|
file_object=self.document_version.get_intermidiate_file()
|
|
)
|
|
converter.seek(page_number=self.page_number - 1)
|
|
|
|
page_image = converter.get_page()
|
|
|
|
with cache_storage_backend.open(cache_filename, 'wb+') as file_object:
|
|
file_object.write(page_image.getvalue())
|
|
except Exception as exception:
|
|
# Cleanup in case of error
|
|
logger.error(
|
|
'Error creating page cache file "%s"; %s',
|
|
cache_filename, exception
|
|
)
|
|
cache_storage_backend.delete(cache_filename)
|
|
raise
|
|
|
|
# Stored transformations
|
|
for stored_transformation in Transformation.objects.get_for_model(self, as_classes=True):
|
|
converter.transform(transformation=stored_transformation)
|
|
|
|
# Interactive transformations
|
|
for transformation in transformations:
|
|
converter.transform(transformation=transformation)
|
|
|
|
if rotation:
|
|
converter.transform(transformation=TransformationRotate(
|
|
degrees=rotation)
|
|
)
|
|
|
|
if size:
|
|
converter.transform(transformation=TransformationResize(
|
|
**dict(zip(('width', 'height'), (size.split('x')))))
|
|
)
|
|
|
|
if zoom_level:
|
|
converter.transform(
|
|
transformation=TransformationZoom(percent=zoom_level)
|
|
)
|
|
|
|
page_image = converter.get_page()
|
|
|
|
if as_base64:
|
|
# TODO: don't prepend 'data:%s;base64,%s' part
|
|
return 'data:%s;base64,%s' % ('image/png', base64.b64encode(page_image.getvalue()))
|
|
else:
|
|
return page_image
|
|
|
|
|
|
@python_2_unicode_compatible
|
|
class RecentDocument(models.Model):
|
|
"""
|
|
Keeps a list of the n most recent accessed or created document for
|
|
a given user
|
|
"""
|
|
user = models.ForeignKey(User, editable=False, verbose_name=_('User'))
|
|
document = models.ForeignKey(
|
|
Document, editable=False, verbose_name=_('Document')
|
|
)
|
|
datetime_accessed = models.DateTimeField(
|
|
auto_now=True, db_index=True, verbose_name=_('Accessed')
|
|
)
|
|
|
|
objects = RecentDocumentManager()
|
|
|
|
def __str__(self):
|
|
return unicode(self.document)
|
|
|
|
class Meta:
|
|
ordering = ('-datetime_accessed',)
|
|
verbose_name = _('Recent document')
|
|
verbose_name_plural = _('Recent documents')
|