586 lines
20 KiB
Python
586 lines
20 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.db import models
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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.utils.translation import ugettext
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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 converter.api import (
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convert, get_page_count, get_available_transformations_choices
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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 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, DocumentPageTransformationManager, DocumentTypeManager,
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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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UUID_FUNCTION = lambda: unicode(uuid.uuid4())
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logger = logging.getLogger(__name__)
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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 __unicode__(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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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=lambda: 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 __unicode__(self):
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return self.label
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@models.permalink
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def get_absolute_url(self):
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return ('documents:document_preview', [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 get_cached_image_name(self, page, version):
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document_version = DocumentVersion.objects.get(pk=version)
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document_page = document_version.pages.get(page_number=page)
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transformations, warnings = document_page.get_transformation_list()
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hash_value = HASH_FUNCTION(''.join([document_version.checksum, unicode(page), unicode(transformations)]))
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return os.path.join(CACHE_PATH, hash_value), transformations
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def get_image_cache_name(self, page, version):
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cache_file_path, transformations = self.get_cached_image_name(page, version)
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if os.path.exists(cache_file_path):
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return cache_file_path
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else:
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document_version = DocumentVersion.objects.get(pk=version)
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document_file = document_version.document.document_save_to_temp_dir(document_version.checksum)
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return convert(input_filepath=document_file, output_filepath=cache_file_path, page=page, transformations=transformations, mimetype=self.file_mimetype)
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def get_valid_image(self, size=DISPLAY_SIZE, page=DEFAULT_PAGE_NUMBER, zoom=DEFAULT_ZOOM_LEVEL, rotation=DEFAULT_ROTATION, version=None):
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if not version:
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version = self.latest_version.pk
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image_cache_name = self.get_image_cache_name(page=page, version=version)
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logger.debug('image_cache_name: %s', image_cache_name)
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return convert(input_filepath=image_cache_name, cleanup_files=False, size=size, zoom=zoom, rotation=rotation)
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def get_image(self, size=DISPLAY_SIZE, page=DEFAULT_PAGE_NUMBER, zoom=DEFAULT_ZOOM_LEVEL, rotation=DEFAULT_ROTATION, as_base64=False, version=None):
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if zoom < ZOOM_MIN_LEVEL:
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zoom = ZOOM_MIN_LEVEL
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if zoom > ZOOM_MAX_LEVEL:
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zoom = ZOOM_MAX_LEVEL
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rotation = rotation % 360
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file_path = self.get_valid_image(size=size, page=page, zoom=zoom, rotation=rotation, version=version)
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logger.debug('file_path: %s', file_path)
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if as_base64:
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mimetype = get_mimetype(open(file_path, 'r'), file_path, mimetype_only=True)[0]
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image = open(file_path, 'r')
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base64_data = base64.b64encode(image.read())
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image.close()
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return 'data:%s;base64,%s' % (mimetype, base64_data)
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else:
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return file_path
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def invalidate_cached_image(self, page):
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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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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=lambda instance, filename: 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 __unicode__(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, page count and transformation 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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transformations = kwargs.pop('transformations', None)
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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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if transformations:
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self.apply_default_transformations(transformations)
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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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handle, filepath = tempfile.mkstemp()
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# Just need the filepath, close the file description
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os.close(handle)
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self.save_to_file(filepath)
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try:
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detected_pages = get_page_count(filepath)
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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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self.description = ugettext('This document\'s file format is not known, the page count has therefore defaulted to 1.')
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self.save()
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try:
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os.remove(filepath)
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except OSError:
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pass
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current_pages = self.pages.order_by('page_number',)
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if current_pages.count() > detected_pages:
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for page in current_pages[detected_pages:]:
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page.delete()
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for page_number in range(detected_pages):
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DocumentPage.objects.get_or_create(
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document_version=self, page_number=page_number + 1)
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if save:
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self.save()
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return detected_pages
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# TODO: remove from here and move to converter app
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def apply_default_transformations(self, transformations):
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# Only apply default transformations on new documents
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if reduce(lambda x, y: x + y, [page.documentpagetransformation_set.count() for page in self.pages.all()]) == 0:
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for transformation in transformations:
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for document_page in self.pages.all():
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page_transformation = DocumentPageTransformation(
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document_page=document_page,
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order=0,
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transformation=transformation.get('transformation'),
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arguments=transformation.get('arguments')
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)
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page_transformation.save()
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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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self.mimetype, self.encoding = get_mimetype(self.open(), self.document.label)
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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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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 __unicode__(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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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 __unicode__(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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@models.permalink
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def get_absolute_url(self):
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return ('documents:document_page_view', [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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class ArgumentsValidator(object):
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message = _('Enter a valid value.')
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code = 'invalid'
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def __init__(self, message=None, code=None):
|
|
if message is not None:
|
|
self.message = message
|
|
if code is not None:
|
|
self.code = code
|
|
|
|
def __call__(self, value):
|
|
"""
|
|
Validates that the input evaluates correctly.
|
|
"""
|
|
value = value.strip()
|
|
try:
|
|
literal_eval(value)
|
|
except (ValueError, SyntaxError):
|
|
raise ValidationError(self.message, code=self.code)
|
|
|
|
|
|
class DocumentPageTransformation(models.Model):
|
|
"""
|
|
Model that stores the transformation and transformation arguments
|
|
for a given document page
|
|
"""
|
|
document_page = models.ForeignKey(DocumentPage, verbose_name=_('Document page'))
|
|
order = models.PositiveIntegerField(default=0, blank=True, null=True, verbose_name=_('Order'), db_index=True)
|
|
transformation = models.CharField(choices=get_available_transformations_choices(), max_length=128, verbose_name=_('Transformation'))
|
|
arguments = models.TextField(blank=True, null=True, verbose_name=_('Arguments'), help_text=_('Use dictionaries to indentify arguments, example: {\'degrees\':90}'), validators=[ArgumentsValidator()])
|
|
objects = DocumentPageTransformationManager()
|
|
|
|
def __unicode__(self):
|
|
return self.get_transformation_display()
|
|
|
|
class Meta:
|
|
ordering = ('order',)
|
|
verbose_name = _('Document page transformation')
|
|
verbose_name_plural = _('Document page transformations')
|
|
|
|
|
|
class RecentDocument(models.Model):
|
|
"""
|
|
Keeps a list of the n most recent accessed or created document for
|
|
a given user
|
|
"""
|
|
user = models.ForeignKey(User, verbose_name=_('User'), editable=False)
|
|
document = models.ForeignKey(Document, verbose_name=_('Document'), editable=False)
|
|
datetime_accessed = models.DateTimeField(verbose_name=_('Accessed'), auto_now=True, db_index=True)
|
|
|
|
objects = RecentDocumentManager()
|
|
|
|
def __unicode__(self):
|
|
return unicode(self.document)
|
|
|
|
class Meta:
|
|
ordering = ('-datetime_accessed',)
|
|
verbose_name = _('Recent document')
|
|
verbose_name_plural = _('Recent documents')
|
|
|
|
|
|
# Quick hack to break the DocumentPage and DocumentPageTransformation circular dependency
|
|
# Can be remove once the transformations are moved to the converter app
|
|
DocumentPage.add_to_class('get_transformation_list', lambda document_page: DocumentPageTransformation.objects.get_for_document_page_as_list(document_page))
|