Style: Move document model functions

Move the document UUID and document hash functions
to the documents.utils module.

Signed-off-by: Roberto Rosario <Roberto.Rosario@mayan-edms.com>

mayan/apps/documents/migrations/0003_auto_20150608_1915.py

@@ -17,7 +17,7 @@ class Migration(migrations.Migration):
             model_name='document',
             name='uuid',
             field=models.CharField(
-                default=mayan.apps.documents.models.UUID_FUNCTION,
+                default=mayan.apps.documents.utils.document_uuid_function,
                 editable=False, max_length=48,
             ),
             preserve_default=True,
@@ -27,7 +27,7 @@ class Migration(migrations.Migration):
             name='file',
             field=models.FileField(
                 storage=FileSystemStorage(),
-                upload_to=mayan.apps.documents.models.UUID_FUNCTION,
+                upload_to=mayan.apps.documents.utils.document_uuid_function,
                 verbose_name='File'
             ),
             preserve_default=True,

mayan/apps/documents/migrations/0042_auto_20180403_0702.py

@@ -17,7 +17,7 @@ class Migration(migrations.Migration):
             field=models.FileField(
                 storage=django.core.files.storage.FileSystemStorage(
                     location=b'mayan/media/document_storage'
-                ), upload_to=mayan.apps.documents.models.UUID_FUNCTION,
+                ), upload_to=mayan.apps.documents.utils.document_uuid_function,
                 verbose_name='File'
             ),
             model_name='documentversion', name='file',

mayan/apps/documents/migrations/0043_auto_20180429_0759.py

@@ -24,7 +24,7 @@ class Migration(migrations.Migration):
             field=models.FileField(
                 storage=django.core.files.storage.FileSystemStorage(
                     location=b'/home/rosarior/development/mayan-edms/mayan/media/document_storage'
-                ), upload_to=mayan.apps.documents.models.UUID_FUNCTION,
+                ), upload_to=mayan.apps.documents.utils.document_uuid_function,
                 verbose_name='File'
             ),
             model_name='documentversion', name='file',

mayan/apps/documents/models.py

@@ -1,6 +1,5 @@
 from __future__ import absolute_import, unicode_literals
 
-import hashlib
 import logging
 import os
 import uuid
@@ -55,19 +54,11 @@ from .signals import (
     post_document_created, post_document_type_change, post_version_upload
 )
 from .storages import storage_documentversion
+from .utils import document_hash_function, document_uuid_function
 
 logger = logging.getLogger(__name__)
 
 
-# document image cache name hash function
-def HASH_FUNCTION(data):
-    return hashlib.sha256(data).hexdigest()
-
-
-def UUID_FUNCTION(*args, **kwargs):
-    return force_text(uuid.uuid4())
-
-
 @python_2_unicode_compatible
 class DocumentType(models.Model):
     """
@@ -433,7 +424,7 @@ class DocumentVersion(models.Model):
 
     # File related fields
     file = models.FileField(
-        storage=storage_documentversion, upload_to=UUID_FUNCTION,
+        storage=storage_documentversion, upload_to=document_uuid_function,
         verbose_name=_('File')
     )
     mimetype = models.CharField(
@@ -701,7 +692,7 @@ class DocumentVersion(models.Model):
         """
         if self.exists():
             source = self.open()
-            self.checksum = force_text(HASH_FUNCTION(source.read()))
+            self.checksum = force_text(document_hash_function(source.read()))
             source.close()
             if save:
                 self.save()

mayan/apps/documents/utils.py

@@ -1,6 +1,10 @@
 from __future__ import unicode_literals
 
+import hashlib
+import uuid
+
 from django.apps import apps
+from django.utils.encoding import force_text
 
 from .literals import DOCUMENT_IMAGES_CACHE_NAME
 
@@ -12,6 +16,14 @@ def callback_update_cache_size(setting):
     cache.save()
 
 
+def document_hash_function(data):
+    return hashlib.sha256(data).hexdigest()
+
+
+def document_uuid_function(*args, **kwargs):
+    return force_text(uuid.uuid4())
+
+
 def parse_range(astr):
     # http://stackoverflow.com/questions/4248399/
     # page-range-for-printing-algorithm