542 lines
17 KiB
Python
542 lines
17 KiB
Python
from __future__ import unicode_literals
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from ast import literal_eval
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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 tempfile
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import uuid
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from django.contrib.auth.models import User
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from django.core.exceptions import ValidationError
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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.translation import ugettext_lazy as _
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from acls.utils import apply_default_acls
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from common.settings import TEMPORARY_DIRECTORY
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from common.utils import fs_cleanup
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from converter import (
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converter_class, TransformationResize, TransformationRotate, TransformationZoom
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)
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from converter.exceptions import UnknownFileFormat
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from converter.literals import (
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DEFAULT_ZOOM_LEVEL, DEFAULT_ROTATION, DEFAULT_PAGE_NUMBER
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)
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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 event_document_create
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from .exceptions import NewDocumentVersionNotAllowed
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from .managers import (
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DocumentManager, DocumentTypeManager, RecentDocumentManager
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)
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from .runtime import storage_backend
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from .settings import (
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CACHE_PATH, DISPLAY_SIZE, LANGUAGE, LANGUAGE_CHOICES, ZOOM_MAX_LEVEL,
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ZOOM_MIN_LEVEL
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)
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from .signals import post_version_upload, post_document_type_change
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HASH_FUNCTION = lambda x: hashlib.sha256(x).hexdigest() # document image cache name hash function
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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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name = models.CharField(max_length=32, verbose_name=_('Name'), unique=True)
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# TODO: find a way to move this to the ocr app
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ocr = models.BooleanField(default=True, verbose_name=_('Automatically queue newly created documents for OCR.'))
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objects = DocumentTypeManager()
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def __str__(self):
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return self.name
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def natural_key(self):
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return (self.name,)
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class Meta:
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verbose_name = _('Document type')
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verbose_name_plural = _('Documents types')
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ordering = ('name',)
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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(default=UUID_FUNCTION, max_length=48, editable=False)
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document_type = models.ForeignKey(DocumentType, verbose_name=_('Document type'), related_name='documents')
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label = models.CharField(max_length=255, default=_('Uninitialized document'), db_index=True, help_text=_('The name of the document'), verbose_name=_('Label'))
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description = models.TextField(blank=True, null=True, verbose_name=_('Description'))
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date_added = models.DateTimeField(verbose_name=_('Added'), auto_now_add=True)
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language = models.CharField(choices=LANGUAGE_CHOICES, default=LANGUAGE, max_length=8, verbose_name=_('Language'))
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objects = DocumentManager()
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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(sender=self.__class__, instance=self)
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@staticmethod
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def clear_image_cache():
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for the_file in os.listdir(CACHE_PATH):
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file_path = os.path.join(CACHE_PATH, the_file)
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if os.path.isfile(file_path):
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os.unlink(file_path)
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def __str__(self):
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return self.label
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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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apply_default_acls(self, user)
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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 invalidate_cached_image(self, page):
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pass
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#try:
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# os.unlink(self.get_cached_image_name(page, self.latest_version.pk)[0])
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#except OSError:
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# pass
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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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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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@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, user=None, comment=None):
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logger.debug('creating new document version')
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# TODO: move this restriction to a signal processor of the checkouts app
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if not self.is_new_versions_allowed(user=user):
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raise NewDocumentVersionNotAllowed
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new_version = DocumentVersion.objects.create(
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document=self,
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file=file_object,
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comment=comment or '',
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)
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logger.debug('new_version saved')
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# TODO: new HISTORY for version updates
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return new_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(self):
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return self.latest_version.file
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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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def document_save_to_temp_dir(self, filename, buffer_size=1024 * 1024):
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temporary_path = os.path.join(TEMPORARY_DIRECTORY, filename)
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return self.save_to_file(temporary_path, buffer_size)
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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(Document, verbose_name=_('Document'), related_name='versions')
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timestamp = models.DateTimeField(verbose_name=_('Timestamp'), auto_now_add=True)
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comment = models.TextField(blank=True, verbose_name=_('Comment'))
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# File related fields
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file = models.FileField(upload_to=UUID_FUNCTION, storage=storage_backend, verbose_name=_('File'))
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mimetype = models.CharField(max_length=255, null=True, blank=True, editable=False)
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encoding = models.CharField(max_length=64, null=True, blank=True, editable=False)
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checksum = models.TextField(blank=True, null=True, verbose_name=_('Checksum'), editable=False)
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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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new_document_version = not self.pk
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# Only do this for new documents
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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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post_version_upload.send(sender=self.__class__, instance=self)
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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 the
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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(file_object=file_object, mime_type=self.mimetype)
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detected_pages = converter.get_page_count()
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except UnknownFileFormat:
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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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detected_pages = 1
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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):
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"""
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Delete the subsequent versions after this one
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"""
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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 the
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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(file_object=file_object)
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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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self.file.storage.delete(self.file.path)
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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.path)
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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.path)
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else:
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result = self.file.storage.open(self.file.path)
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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.path)
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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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@python_2_unicode_compatible
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class DocumentTypeFilename(models.Model):
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"""
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List of filenames available to a specific document type for the
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quick rename functionality
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"""
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document_type = models.ForeignKey(DocumentType, related_name='filenames', verbose_name=_('Document type'))
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filename = models.CharField(max_length=128, verbose_name=_('Filename'), db_index=True)
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enabled = models.BooleanField(default=True, verbose_name=_('Enabled'))
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def __str__(self):
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return self.filename
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class Meta:
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ordering = ('filename',)
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unique_together = ('document_type', 'filename')
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verbose_name = _('Document type quick rename filename')
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verbose_name_plural = _('Document types quick rename filenames')
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@python_2_unicode_compatible
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class DocumentPage(models.Model):
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"""
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Model that describes a document version page including it's content
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"""
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document_version = models.ForeignKey(DocumentVersion, verbose_name=_('Document version'), related_name='pages')
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content = models.TextField(blank=True, null=True, verbose_name=_('Content'))
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page_label = models.CharField(max_length=40, blank=True, null=True, verbose_name=_('Page label'))
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page_number = models.PositiveIntegerField(default=1, editable=False, verbose_name=_('Page number'), db_index=True)
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def __str__(self):
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return _('Page %(page_num)d out of %(total_pages)d of %(document)s') % {
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'document': unicode(self.document),
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'page_num': self.page_number,
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'total_pages': self.document_version.pages.count()
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}
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class Meta:
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ordering = ('page_number',)
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verbose_name = _('Document page')
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verbose_name_plural = _('Document pages')
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def get_absolute_url(self):
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return reverse('documents:document_page_view', args=[self.pk])
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@property
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def siblings(self):
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return DocumentPage.objects.filter(document_version=self.document_version)
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# Compatibility methods
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@property
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def document(self):
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return self.document_version.document
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def get_uuid(self):
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return 'page-cache-{}'.format(self.pk)
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def get_cache_filename(self):
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return os.path.join(CACHE_PATH, self.get_uuid())
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def get_image(self, *args, **kwargs):
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transformations = kwargs.pop('transformations', [])
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size = kwargs.pop('size', DISPLAY_SIZE)
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rotation = kwargs.pop('rotation', DEFAULT_ROTATION)
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zoom_level = kwargs.pop('zoom', DEFAULT_ZOOM_LEVEL)
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if zoom_level < ZOOM_MIN_LEVEL:
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zoom_level = ZOOM_MIN_LEVEL
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if zoom_level > ZOOM_MAX_LEVEL:
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zoom_level = ZOOM_MAX_LEVEL
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rotation = rotation % 360
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as_base64 = kwargs.pop('as_base64', False)
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cache_filename = self.get_cache_filename()
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if os.path.exists(cache_filename):
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converter = converter_class(file_object=open(cache_filename))
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converter.seek(0)
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else:
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try:
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converter = converter_class(file_object=self.document_version.open())
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converter.seek(page_number=self.page_number - 1)
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page_image = converter.get_page()
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with open(cache_filename, 'wb+') as file_object:
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file_object.write(page_image.getvalue())
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except:
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fs_cleanup(cache_filename)
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raise
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# Stored transformations
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for stored_transformation in Transformation.objects.get_for_model(self, as_classes=True):
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converter.transform(transformation=stored_transformation)
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# Interactive transformations
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for transformation in transformations:
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converter.transform(transformation=transformation)
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if rotation:
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converter.transform(transformation=TransformationRotate(degrees=rotation))
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if size:
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converter.transform(transformation=TransformationResize(**dict(zip(('width', 'height'), (size.split('x'))))))
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if zoom_level:
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converter.transform(transformation=TransformationZoom(percent=zoom_level))
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page_image = converter.get_page()
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if as_base64:
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return 'data:%s;base64,%s' % ('image/png', base64.b64encode(page_image.getvalue()))
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else:
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return page_image
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@python_2_unicode_compatible
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class RecentDocument(models.Model):
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"""
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Keeps a list of the n most recent accessed or created document for
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a given user
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"""
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user = models.ForeignKey(User, verbose_name=_('User'), editable=False)
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document = models.ForeignKey(Document, verbose_name=_('Document'), editable=False)
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datetime_accessed = models.DateTimeField(verbose_name=_('Accessed'), auto_now=True, db_index=True)
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objects = RecentDocumentManager()
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def __str__(self):
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return unicode(self.document)
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class Meta:
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ordering = ('-datetime_accessed',)
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verbose_name = _('Recent document')
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verbose_name_plural = _('Recent documents')
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