Enable Azure BlobStorage as an alternative to AWS S3

This adds a new storage backend for Azure BlobStorage, I'm running this patch in Azure Kubernetes
hosting all my assets in Azure BlobStorage and it's been stable enough I thought I should commit
this back upstream.

.dockerignore

@@ -5,3 +5,4 @@ __pycache__
 .git
 .github
 .pytest*
+.env

bookwyrm/settings.py

@@ -341,6 +341,7 @@ if USE_HTTPS:
     CSRF_COOKIE_SECURE = True
 
 USE_S3 = env.bool("USE_S3", False)
+USE_AZURE = env.bool("USE_AZURE", False)
 
 if USE_S3:
     # AWS settings
@@ -364,6 +365,23 @@ if USE_S3:
     DEFAULT_FILE_STORAGE = "bookwyrm.storage_backends.ImagesStorage"
     CSP_DEFAULT_SRC = ["'self'", AWS_S3_CUSTOM_DOMAIN] + CSP_ADDITIONAL_HOSTS
     CSP_SCRIPT_SRC = ["'self'", AWS_S3_CUSTOM_DOMAIN] + CSP_ADDITIONAL_HOSTS
+elif USE_AZURE:
+    AZURE_ACCOUNT_NAME = env("AZURE_ACCOUNT_NAME")
+    AZURE_ACCOUNT_KEY = env("AZURE_ACCOUNT_KEY")
+    AZURE_CONTAINER = env("AZURE_CONTAINER")
+    AZURE_CUSTOM_DOMAIN = env("AZURE_CUSTOM_DOMAIN")
+    # Azure Static settings
+    STATIC_LOCATION = "static"
+    STATIC_URL = f"{PROTOCOL}://{AZURE_CUSTOM_DOMAIN}/{AZURE_CONTAINER}/{STATIC_LOCATION}/"
+    STATICFILES_STORAGE = "bookwyrm.storage_backends.AzureStaticStorage"
+    # Azure Media settings
+    MEDIA_LOCATION = "images"
+    MEDIA_URL = f"{PROTOCOL}://{AZURE_CUSTOM_DOMAIN}/{AZURE_CONTAINER}/{MEDIA_LOCATION}/"
+    MEDIA_FULL_URL = MEDIA_URL
+    STATIC_FULL_URL = STATIC_URL
+    DEFAULT_FILE_STORAGE = "bookwyrm.storage_backends.AzureImagesStorage"
+    CSP_DEFAULT_SRC = ["'self'", AZURE_CUSTOM_DOMAIN] + CSP_ADDITIONAL_HOSTS
+    CSP_SCRIPT_SRC = ["'self'", AZURE_CUSTOM_DOMAIN] + CSP_ADDITIONAL_HOSTS
 else:
     STATIC_URL = "/static/"
     MEDIA_URL = "/images/"

bookwyrm/storage_backends.py

@@ -2,6 +2,7 @@
 import os
 from tempfile import SpooledTemporaryFile
 from storages.backends.s3boto3 import S3Boto3Storage
+from storages.backends.azure_storage import AzureStorage
 
 
 class StaticStorage(S3Boto3Storage):  # pylint: disable=abstract-method
@@ -47,3 +48,16 @@ class ImagesStorage(S3Boto3Storage):  # pylint: disable=abstract-method
             # Upload the object which will auto close the
             # content_autoclose instance
             return super()._save(name, content_autoclose)
+
+
+class AzureStaticStorage(AzureStorage):  # pylint: disable=abstract-method
+    """Storage class for Static contents"""
+
+    location = "static"
+
+
+class AzureImagesStorage(AzureStorage):  # pylint: disable=abstract-method
+    """Storage class for Image files"""
+
+    location = "images"
+    overwrite_files = False

requirements.txt

@@ -23,6 +23,7 @@ responses==0.22.0
 pytz>=2022.7
 boto3==1.26.57
 django-storages==1.13.2
+django-storages[azure]
 django-redis==5.2.0
 opentelemetry-api==1.11.1
 opentelemetry-exporter-otlp-proto-grpc==1.11.1