Support for STATIC and MEDIA files

  - Updated the __init__ of `MinioBackend` to meet Django's custom storage system requirements
    "Django must be able to instantiate your storage system without any arguments"
    The `MinioBackend` class can be used as a value for `DEFAULT_FILE_STORAGE`
  - MinioBackendStatic: A new subclass of `MinioBackend` for supporting django-minio-backend as a static files storage
  - Added missing docstrings throughout the project
  - DjangoExampleApplication extended by `class GenericAttachment` for demonstrating a `FileField` without an explicit storage backend
  - DjangoExampleProject settings.py has been extended with the following new values:
    - MINIO_MEDIA_FILES_BUCKET
    - MINIO_STATIC_FILES_BUCKET
  - Updated README.md

DjangoExampleApplication/admin.py

@@ -2,7 +2,7 @@
 from django.db.models.query import QuerySet
 from django.contrib import admin
 from django.core.handlers.wsgi import WSGIRequest
-from .models import PublicAttachment, PrivateAttachment, Image
+from .models import PublicAttachment, PrivateAttachment, Image, GenericAttachment
 
 
 # https://docs.djangoproject.com/en/2.2/ref/contrib/admin/actions/#writing-action-functions
@@ -32,6 +32,14 @@ class ImageAdmin(admin.ModelAdmin):
     actions = [delete_everywhere, ]
 
 
+@admin.register(GenericAttachment)
+class GenericAttachmentAdmin(admin.ModelAdmin):
+    list_display = ('id', 'file',)
+    readonly_fields = ('id', )
+    model = GenericAttachment
+    actions = [delete_everywhere, ]
+
+
 # Register your models here.
 @admin.register(PublicAttachment)
 class PublicAttachmentAdmin(admin.ModelAdmin):

DjangoExampleApplication/migrations/0003_genericattachment.py

@@ -0,0 +1,21 @@
+# Generated by Django 3.2.3 on 2021-07-18 22:07
+
+from django.db import migrations, models
+import uuid
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('DjangoExampleApplication', '0002_auto_20210313_1049'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='GenericAttachment',
+            fields=[
+                ('id', models.UUIDField(default=uuid.uuid4, editable=False, primary_key=True, serialize=False)),
+                ('file', models.FileField(upload_to='', verbose_name='Object Upload (to default storage)')),
+            ],
+        ),
+    ]

DjangoExampleApplication/models.py

@@ -23,13 +23,30 @@ class Image(models.Model):
 
     def delete(self, *args, **kwargs):
         """
-        Delete must be overridden because the inherited delete method does not call `self.file.delete()`.
+        Delete must be overridden because the inherited delete method does not call `self.image.delete()`.
         """
         # noinspection PyUnresolvedReferences
         self.image.delete()
         super(Image, self).delete(*args, **kwargs)
 
 
+class GenericAttachment(models.Model):
+    """
+    This is for demonstrating uploads to the default file storage
+    """
+    objects = models.Manager()
+    id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
+    file = models.FileField(verbose_name="Object Upload (to default storage)")
+
+    def delete(self, *args, **kwargs):
+        """
+        Delete must be overridden because the inherited delete method does not call `self.image.delete()`.
+        """
+        # noinspection PyUnresolvedReferences
+        self.image.delete()
+        super(GenericAttachment, self).delete(*args, **kwargs)
+
+
 # Create your models here.
 class PublicAttachment(models.Model):
     def set_file_path_name(self, file_name_ext: str) -> str:

DjangoExampleProject/settings.py

@@ -116,6 +116,8 @@
 # Static files (CSS, JavaScript, Images)
 # https://docs.djangoproject.com/en/3.0/howto/static-files/
 STATIC_URL = '/static/'
+STATICFILES_STORAGE = 'django_minio_backend.models.MinioBackendStatic'
+DEFAULT_FILE_STORAGE = 'django_minio_backend.models.MinioBackend'
 
 # #################### #
 # django_minio_backend #
@@ -154,14 +156,18 @@
 MINIO_USE_HTTPS = bool(distutils.util.strtobool(os.getenv("GH_MINIO_USE_HTTPS", "true")))
 MINIO_PRIVATE_BUCKETS = [
     'django-backend-dev-private',
+    'my-media-files-bucket',
 ]
 MINIO_PUBLIC_BUCKETS = [
     'django-backend-dev-public',
-    "t5p2g08k31",
-    "7xi7lx9rjh",
+    't5p2g08k31',
+    '7xi7lx9rjh',
+    'my-static-files-bucket',
 ]
 MINIO_URL_EXPIRY_HOURS = timedelta(days=1)  # Default is 7 days (longest) if not defined
 MINIO_CONSISTENCY_CHECK_ON_START = True
 MINIO_POLICY_HOOKS: List[Tuple[str, dict]] = [
     # ('django-backend-dev-private', dummy_policy)
 ]
+MINIO_MEDIA_FILES_BUCKET = 'my-media-files-bucket'  # replacement for STATIC_ROOT
+MINIO_STATIC_FILES_BUCKET = 'my-static-files-bucket'  # replacement for MEDIA_ROOT

README.md

@@ -57,6 +57,8 @@ MINIO_PUBLIC_BUCKETS = [
     'django-backend-dev-public',
 ]
 MINIO_POLICY_HOOKS: List[Tuple[str, dict]] = []
+# MINIO_MEDIA_FILES_BUCKET = 'my-media-files-bucket'  # replacement for MEDIA_ROOT
+# MINIO_STATIC_FILES_BUCKET = 'my-static-files-bucket'  # replacement for STATIC_ROOT
 ```
 
 4. Implement your own Attachment handler and integrate **django-minio-backend**:
@@ -79,6 +81,48 @@ python manage.py initialize_buckets
 
 Code reference: [initialize_buckets.py](django_minio_backend/management/commands/initialize_buckets.py).
 
+### Static Files Support
+**django-minio-backend** allows serving static files from MinIO.
+To learn more about Django static files, see [Managing static files](https://docs.djangoproject.com/en/3.2/howto/static-files/), and [STATICFILES_STORAGE](https://docs.djangoproject.com/en/3.2/ref/settings/#staticfiles-storage).
+
+To enable static files support, update your `settings.py`:
+```python
+STATICFILES_STORAGE = 'django_minio_backend.models.MinioBackendStatic'
+MINIO_STATIC_FILES_BUCKET = 'my-static-files-bucket'  # replacement for STATIC_ROOT
+# Add the value of MINIO_STATIC_FILES_BUCKET to one of the pre-configured bucket lists. eg.:
+# MINIO_PRIVATE_BUCKETS.append(MINIO_STATIC_FILES_BUCKET)
+# MINIO_PUBLIC_BUCKETS.append(MINIO_STATIC_FILES_BUCKET)
+```
+
+The value of `STATIC_URL` is ignored, but it must be defined otherwise Django will throw an error.
+
+**IMPORTANT**<br>
+The value set in `MINIO_STATIC_FILES_BUCKET` must be added either to `MINIO_PRIVATE_BUCKETS` or `MINIO_PUBLIC_BUCKETS`,
+otherwise **django-minio-backend** will raise an exception. This setting determines the privacy of generated file URLs which can be unsigned public or signed private.  
+
+**Note:** If `MINIO_STATIC_FILES_BUCKET` is not set, the default value (`auto-generated-static-media-files`) will be used.
+
+### Default File Storage Support
+**django-minio-backend** can be configured as a default file storage.
+To learn more, see [DEFAULT_FILE_STORAGE](https://docs.djangoproject.com/en/3.2/ref/settings/#default-file-storage).
+
+To configure **django-minio-backend** as the default file storage, update your `settings.py`:
+```python
+DEFAULT_FILE_STORAGE = 'django_minio_backend.models.MinioBackend'
+MINIO_MEDIA_FILES_BUCKET = 'my-media-files-bucket'  # replacement for MEDIA_ROOT
+# Add the value of MINIO_STATIC_FILES_BUCKET to one of the pre-configured bucket lists. eg.:
+# MINIO_PRIVATE_BUCKETS.append(MINIO_STATIC_FILES_BUCKET)
+# MINIO_PUBLIC_BUCKETS.append(MINIO_STATIC_FILES_BUCKET)
+```
+
+The value of `MEDIA_URL` is ignored, but it must be defined otherwise Django will throw an error.
+
+**IMPORTANT**<br>
+The value set in `MINIO_MEDIA_FILES_BUCKET` must be added either to `MINIO_PRIVATE_BUCKETS` or `MINIO_PUBLIC_BUCKETS`,
+otherwise **django-minio-backend** will raise an exception. This setting determines the privacy of generated file URLs which can be unsigned public or signed private.
+
+**Note:** If `MINIO_MEDIA_FILES_BUCKET` is not set, the default value (`auto-generated-bucket-media-files`) will be used.
+
 ### Health Check
 To check the connection link between Django and MinIO, use the provided `MinioBackend.is_minio_available()` method.<br>
 It returns a `MinioServerStatus` instance which can be quickly evaluated as boolean.<br>
@@ -87,7 +131,7 @@ It returns a `MinioServerStatus` instance which can be quickly evaluated as bool
 ```python
 from django_minio_backend import MinioBackend
 
-minio_available = MinioBackend('').is_minio_available()  # An empty string is fine this time
+minio_available = MinioBackend().is_minio_available()  # An empty string is fine this time
 if minio_available:
     print("OK")
 else:

django_minio_backend/apps.py

@@ -1,5 +1,6 @@
 from django.apps import AppConfig
 from .utils import get_setting, ConfigurationError
+from .models import MinioBackendStatic
 
 
 __all__ = ['DjangoMinioBackendConfig', ]
@@ -20,3 +21,9 @@ def ready(self):
         external_use_https = get_setting('MINIO_EXTERNAL_ENDPOINT_USE_HTTPS')
         if (external_address and external_use_https is None) or (not external_address and external_use_https):
             raise ConfigurationError('MINIO_EXTERNAL_ENDPOINT must be configured together with MINIO_EXTERNAL_ENDPOINT_USE_HTTPS')
+
+        # Validate static storage and default storage configurations
+        staticfiles_storage: str = get_setting('STATICFILES_STORAGE')
+        if staticfiles_storage.endswith(MinioBackendStatic.__name__):
+            mbs = MinioBackendStatic()
+            mbs.check_bucket_existence()

django_minio_backend/management/commands/initialize_buckets.py

@@ -25,7 +25,7 @@ def handle(self, *args, **options):
                 self.stdout.write(
                     f"Bucket ({m.bucket}) policy has been set to public", ending='\n') if not silenced else None
 
-        c = MinioBackend('')  # Client
+        c = MinioBackend()  # Client
         for policy_tuple in get_setting('MINIO_POLICY_HOOKS', []):
             bucket, policy = policy_tuple
             c.set_bucket_policy(bucket, policy)

django_minio_backend/management/commands/is_minio_available.py

@@ -9,7 +9,7 @@ def add_arguments(self, parser):
         parser.add_argument('--silenced', action='store_true', default=False, help='No console messages')
 
     def handle(self, *args, **options):
-        m = MinioBackend('')  # no configured bucket
+        m = MinioBackend()  # use default storage
         silenced = options.get('silenced')
         self.stdout.write(f"Checking the availability of MinIO at {m.base_url}\n") if not silenced else None