refactor(config): consolidate into single config.json, storage backend selectable

.gitignore

@@ -7,6 +7,7 @@ uploads/*
 .env
 server.log
 s3_config.json
+config.json
 scripts/fix_*.py
 scripts/migrate_*.py
 scripts/test_*.py

app/storage.py

@@ -1,18 +1,22 @@
 """Image storage abstraction: local filesystem or S3-compatible object storage.
 
-S3 config is read from ``s3_config.json`` in the project root::
+All system configuration lives in ``config.json`` in the project root::
 
     {
-        "enabled": true,
-        "endpoint": "https://s3.amazonaws.com",
-        "bucket": "my-mailova-bucket",
-        "region": "auto",
-        "access_key": "AKIA...",
-        "secret_key": "...",
-        "public_url": "https://cdn.example.com/mailova"
+        "storage": {
+            "backend": "local",
+            "s3": {
+                "endpoint": "https://s3.amazonaws.com",
+                "bucket": "my-mailova-bucket",
+                "region": "auto",
+                "access_key": "AKIA...",
+                "secret_key": "...",
+                "public_url": "https://cdn.example.com/mailova"
+            }
+        }
     }
 
-When the file is missing or ``enabled`` is false, local storage is used.
+``storage.backend``: ``"local"`` (default) or ``"s3"``.
 
 URL scheme
 ~~~~~~~~~~
@@ -33,7 +37,7 @@ from typing import Protocol
 
 from app.config import UPLOAD_DIR
 
-S3_CONFIG_PATH = Path(__file__).resolve().parent.parent / "s3_config.json"
+CONFIG_PATH = Path(__file__).resolve().parent.parent / "config.json"
 
 
 class StorageBackend(Protocol):
@@ -128,40 +132,46 @@ def _strip_prefix(key: str) -> str:
     return key
 
 
+# ── Config loading ─────────────────────────────────────────────────
+
+def load_config() -> dict:
+    """Load config.json. Returns empty dict if missing."""
+    if not CONFIG_PATH.exists():
+        return {}
+    try:
+        return json.loads(CONFIG_PATH.read_text(encoding="utf-8"))
+    except Exception:
+        return {}
+
+
 # ── Singleton accessor ─────────────────────────────────────────────
 
 _backend: StorageBackend | None = None
 
 
-def _load_s3_config() -> dict | None:
-    """Read s3_config.json. Returns None if not configured / disabled."""
-    if not S3_CONFIG_PATH.exists():
-        return None
-    try:
-        cfg = json.loads(S3_CONFIG_PATH.read_text(encoding="utf-8"))
-        if not cfg.get("enabled") or not cfg.get("bucket"):
-            return None
-        return cfg
-    except Exception:
-        return None
-
-
 def get_storage() -> StorageBackend:
-    """Get the active storage backend (S3 if configured, otherwise local)."""
+    """Get the active storage backend based on config.json."""
     global _backend
     if _backend is not None:
         return _backend
 
-    s3_cfg = _load_s3_config()
-    if s3_cfg:
-        _backend = S3Storage(
-            endpoint_url=s3_cfg.get("endpoint", ""),
-            bucket=s3_cfg["bucket"],
-            access_key=s3_cfg.get("access_key", ""),
-            secret_key=s3_cfg.get("secret_key", ""),
-            region=s3_cfg.get("region", "auto"),
-            public_url=s3_cfg.get("public_url", ""),
-        )
+    cfg = load_config()
+    backend = cfg.get("storage", {}).get("backend", "local")
+
+    if backend == "s3":
+        s3 = cfg.get("storage", {}).get("s3", {})
+        if not s3.get("bucket"):
+            # fallback to local if S3 is misconfigured
+            _backend = LocalStorage()
+        else:
+            _backend = S3Storage(
+                endpoint_url=s3.get("endpoint", ""),
+                bucket=s3["bucket"],
+                access_key=s3.get("access_key", ""),
+                secret_key=s3.get("secret_key", ""),
+                region=s3.get("region", "auto"),
+                public_url=s3.get("public_url", ""),
+            )
     else:
         _backend = LocalStorage()
     return _backend

config.example.json

@@ -0,0 +1,13 @@
+{
+    "storage": {
+        "backend": "local",
+        "s3": {
+            "endpoint": "https://s3.amazonaws.com",
+            "bucket": "my-mailova-bucket",
+            "region": "auto",
+            "access_key": "AKIA...",
+            "secret_key": "...",
+            "public_url": "https://cdn.example.com/mailova"
+        }
+    }
+}

s3_config.example.json

@@ -1,9 +0,0 @@
-{
-    "enabled": false,
-    "endpoint": "https://s3.amazonaws.com",
-    "bucket": "my-mailova-bucket",
-    "region": "auto",
-    "access_key": "AKIA...",
-    "secret_key": "...",
-    "public_url": "https://cdn.example.com/mailova"
-}