Merge pull request #1026 from digitalocean/image-attachments

#152: Image attachments

netbox/extras/api/serializers.py

@@ -1,9 +1,14 @@
 from rest_framework import serializers
 
-from dcim.api.serializers import NestedSiteSerializer
-from extras.models import ACTION_CHOICES, Graph, GRAPH_TYPE_CHOICES, ExportTemplate, TopologyMap, UserAction
+from django.core.exceptions import ObjectDoesNotExist
+
+from dcim.api.serializers import NestedDeviceSerializer, NestedRackSerializer, NestedSiteSerializer
+from dcim.models import Device, Rack, Site
+from extras.models import (
+    ACTION_CHOICES, ExportTemplate, Graph, GRAPH_TYPE_CHOICES, ImageAttachment, TopologyMap, UserAction,
+)
 from users.api.serializers import NestedUserSerializer
-from utilities.api import ChoiceFieldSerializer
+from utilities.api import ChoiceFieldSerializer, ContentTypeFieldSerializer
 
 
 #
@@ -71,6 +76,52 @@ class WritableTopologyMapSerializer(serializers.ModelSerializer):
         fields = ['id', 'name', 'slug', 'site', 'device_patterns', 'description']
 
 
+#
+# Image attachments
+#
+
+class ImageAttachmentSerializer(serializers.ModelSerializer):
+    parent = serializers.SerializerMethodField()
+
+    class Meta:
+        model = ImageAttachment
+        fields = ['id', 'parent', 'name', 'image', 'image_height', 'image_width', 'created']
+
+    def get_parent(self, obj):
+
+        # Static mapping of models to their nested serializers
+        if isinstance(obj.parent, Device):
+            serializer = NestedDeviceSerializer
+        elif isinstance(obj.parent, Rack):
+            serializer = NestedRackSerializer
+        elif isinstance(obj.parent, Site):
+            serializer = NestedSiteSerializer
+        else:
+            raise Exception("Unexpected type of parent object for ImageAttachment")
+
+        return serializer(obj.parent, context={'request': self.context['request']}).data
+
+
+class WritableImageAttachmentSerializer(serializers.ModelSerializer):
+    content_type = ContentTypeFieldSerializer()
+
+    class Meta:
+        model = ImageAttachment
+        fields = ['id', 'content_type', 'object_id', 'name', 'image']
+
+    def validate(self, data):
+
+        # Validate that the parent object exists
+        try:
+            data['content_type'].get_object_for_this_type(id=data['object_id'])
+        except ObjectDoesNotExist:
+            raise serializers.ValidationError(
+                "Invalid parent object: {} ID {}".format(data['content_type'], data['object_id'])
+            )
+
+        return data
+
+
 #
 # User actions
 #

netbox/extras/api/urls.py

@@ -23,6 +23,9 @@ router.register(r'export-templates', views.ExportTemplateViewSet)
 # Topology maps
 router.register(r'topology-maps', views.TopologyMapViewSet)
 
+# Image attachments
+router.register(r'image-attachments', views.ImageAttachmentViewSet)
+
 # Recent activity
 router.register(r'recent-activity', views.RecentActivityViewSet)
 

netbox/extras/api/views.py

@@ -6,7 +6,7 @@ from django.http import HttpResponse
 from django.shortcuts import get_object_or_404
 
 from extras import filters
-from extras.models import ExportTemplate, Graph, TopologyMap, UserAction
+from extras.models import ExportTemplate, Graph, ImageAttachment, TopologyMap, UserAction
 from utilities.api import WritableSerializerMixin
 from . import serializers
 
@@ -80,6 +80,12 @@ class TopologyMapViewSet(WritableSerializerMixin, ModelViewSet):
         return response
 
 
+class ImageAttachmentViewSet(WritableSerializerMixin, ModelViewSet):
+    queryset = ImageAttachment.objects.all()
+    serializer_class = serializers.ImageAttachmentSerializer
+    write_serializer_class = serializers.WritableImageAttachmentSerializer
+
+
 class RecentActivityViewSet(ReadOnlyModelViewSet):
     """
     List all UserActions to provide a log of recent activity.

netbox/extras/forms.py

@@ -3,9 +3,10 @@ from collections import OrderedDict
 from django import forms
 from django.contrib.contenttypes.models import ContentType
 
-from utilities.forms import BulkEditForm, LaxURLField
+from utilities.forms import BootstrapMixin, BulkEditForm, LaxURLField
 from .models import (
-    CF_TYPE_BOOLEAN, CF_TYPE_DATE, CF_TYPE_INTEGER, CF_TYPE_SELECT, CF_TYPE_URL, CustomField, CustomFieldValue
+    CF_TYPE_BOOLEAN, CF_TYPE_DATE, CF_TYPE_INTEGER, CF_TYPE_SELECT, CF_TYPE_URL, CustomField, CustomFieldValue,
+    ImageAttachment,
 )
 
 
@@ -158,3 +159,10 @@ class CustomFieldFilterForm(forms.Form):
         for name, field in custom_fields:
             field.required = False
             self.fields[name] = field
+
+
+class ImageAttachmentForm(BootstrapMixin, forms.ModelForm):
+
+    class Meta:
+        model = ImageAttachment
+        fields = ['name', 'image']

netbox/extras/migrations/0005_add_imageattachment.py

@@ -0,0 +1,34 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.10.6 on 2017-04-03 15:55
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+import django.db.models.deletion
+import extras.models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('contenttypes', '0002_remove_content_type_name'),
+        ('extras', '0004_topologymap_change_comma_to_semicolon'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='ImageAttachment',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('object_id', models.PositiveIntegerField()),
+                ('image', models.ImageField(height_field=b'image_height', upload_to=extras.models.image_upload, width_field=b'image_width')),
+                ('image_height', models.PositiveSmallIntegerField()),
+                ('image_width', models.PositiveSmallIntegerField()),
+                ('name', models.CharField(blank=True, max_length=50)),
+                ('created', models.DateTimeField(auto_now_add=True)),
+                ('content_type', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='contenttypes.ContentType')),
+            ],
+            options={
+                'ordering': ['name'],
+            },
+        ),
+    ]

netbox/extras/models.py

@@ -359,6 +359,61 @@ class TopologyMap(models.Model):
         return graph.pipe(format=img_format)
 
 
+#
+# Image attachments
+#
+
+def image_upload(instance, filename):
+
+    path = 'image-attachments/'
+
+    # Rename the file to the provided name, if any. Attempt to preserve the file extension.
+    extension = filename.rsplit('.')[-1]
+    if instance.name and extension in ['bmp', 'gif', 'jpeg', 'jpg', 'png']:
+        filename = '.'.join([instance.name, extension])
+    elif instance.name:
+        filename = instance.name
+
+    return '{}{}_{}_{}'.format(path, instance.content_type.name, instance.object_id, filename)
+
+
+@python_2_unicode_compatible
+class ImageAttachment(models.Model):
+    """
+    An uploaded image which is associated with an object.
+    """
+    content_type = models.ForeignKey(ContentType)
+    object_id = models.PositiveIntegerField()
+    parent = GenericForeignKey('content_type', 'object_id')
+    image = models.ImageField(upload_to=image_upload, height_field='image_height', width_field='image_width')
+    image_height = models.PositiveSmallIntegerField()
+    image_width = models.PositiveSmallIntegerField()
+    name = models.CharField(max_length=50, blank=True)
+    created = models.DateTimeField(auto_now_add=True)
+
+    class Meta:
+        ordering = ['name']
+
+    def __str__(self):
+        if self.name:
+            return self.name
+        filename = self.image.name.rsplit('/', 1)[-1]
+        return filename.split('_', 2)[2]
+
+    def delete(self, *args, **kwargs):
+
+        _name = self.image.name
+
+        super(ImageAttachment, self).delete(*args, **kwargs)
+
+        # Delete file from disk
+        self.image.delete(save=False)
+
+        # Deleting the file erases its name. We restore the image's filename here in case we still need to reference it
+        # before the request finishes. (For example, to display a message indicating the ImageAttachment was deleted.)
+        self.image.name = _name
+
+
 #
 # User actions
 #

netbox/extras/urls.py

@@ -0,0 +1,12 @@
+from django.conf.urls import url
+
+from extras import views
+
+
+urlpatterns = [
+
+    # Image attachments
+    url(r'^image-attachments/(?P<pk>\d+)/edit/$', views.ImageAttachmentEditView.as_view(), name='imageattachment_edit'),
+    url(r'^image-attachments/(?P<pk>\d+)/delete/$', views.ImageAttachmentDeleteView.as_view(), name='imageattachment_delete'),
+
+]

netbox/extras/views.py

@@ -0,0 +1,30 @@
+from django.contrib.auth.mixins import PermissionRequiredMixin
+from django.shortcuts import get_object_or_404
+
+from utilities.views import ObjectDeleteView, ObjectEditView
+from .forms import ImageAttachmentForm
+from .models import ImageAttachment
+
+
+class ImageAttachmentEditView(PermissionRequiredMixin, ObjectEditView):
+    permission_required = 'extras.change_imageattachment'
+    model = ImageAttachment
+    form_class = ImageAttachmentForm
+
+    def alter_obj(self, imageattachment, request, args, kwargs):
+        if not imageattachment.pk:
+            # Assign the parent object based on URL kwargs
+            model = kwargs.get('model')
+            imageattachment.obj = get_object_or_404(model, pk=kwargs['object_id'])
+        return imageattachment
+
+    def get_return_url(self, imageattachment):
+        return imageattachment.obj.get_absolute_url()
+
+
+class ImageAttachmentDeleteView(PermissionRequiredMixin, ObjectDeleteView):
+    permission_required = 'dcim.delete_imageattachment'
+    model = ImageAttachment
+
+    def get_return_url(self, imageattachment):
+        return imageattachment.obj.get_absolute_url()