feat(storage): support cloud storage

app/dependencies/storage.py

@@ -0,0 +1,52 @@
+from __future__ import annotations
+
+from typing import cast
+
+from app.config import (
+    AWSS3StorageSettings,
+    CloudflareR2Settings,
+    LocalStorageSettings,
+    StorageServiceType,
+    settings,
+)
+from app.storage import StorageService
+from app.storage.cloudflare_r2 import AWSS3StorageService, CloudflareR2StorageService
+from app.storage.local import LocalStorageService
+
+storage: StorageService | None = None
+
+
+def init_storage_service():
+    global storage
+    if settings.storage_service == StorageServiceType.LOCAL:
+        storage_settings = cast(LocalStorageSettings, settings.storage_settings)
+        storage = LocalStorageService(
+            storage_path=storage_settings.local_storage_path,
+        )
+    elif settings.storage_service == StorageServiceType.CLOUDFLARE_R2:
+        storage_settings = cast(CloudflareR2Settings, settings.storage_settings)
+        storage = CloudflareR2StorageService(
+            account_id=storage_settings.r2_account_id,
+            access_key_id=storage_settings.r2_access_key_id,
+            secret_access_key=storage_settings.r2_secret_access_key,
+            bucket_name=storage_settings.r2_bucket_name,
+            public_url_base=storage_settings.r2_public_url_base,
+        )
+    elif settings.storage_service == StorageServiceType.AWS_S3:
+        storage_settings = cast(AWSS3StorageSettings, settings.storage_settings)
+        storage = AWSS3StorageService(
+            access_key_id=storage_settings.s3_access_key_id,
+            secret_access_key=storage_settings.s3_secret_access_key,
+            bucket_name=storage_settings.s3_bucket_name,
+            public_url_base=storage_settings.s3_public_url_base,
+            region_name=storage_settings.s3_region_name,
+        )
+    else:
+        raise ValueError(f"Unsupported storage service: {settings.storage_service}")
+    return storage
+
+
+def get_storage_service():
+    if storage is None:
+        return init_storage_service()
+    return storage