fix: corrige 6 bugs mineurs (BUG-035 a BUG-040)

backend/auth/middleware.py

@@ -4,6 +4,7 @@
 
 import logging
 import os
+import sys
 
 from fastapi import Depends, HTTPException, Request
 from fastapi.security import HTTPAuthorizationCredentials, HTTPBearer
@@ -17,6 +18,9 @@ logger = logging.getLogger("obsigate.auth.middleware")
 
 security = HTTPBearer(auto_error=False)
 
+#: Hosts considered safe to bind without authentication (loopback only).
+_LOOPBACK_HOSTS = {"127.0.0.1", "::1", "localhost", "0:0:0:0:0:0:0:1"}
+
 
 def is_auth_enabled() -> bool:
     """Check if authentication is enabled via environment variable.
@@ -26,6 +30,34 @@ def is_auth_enabled() -> bool:
     return os.environ.get("OBSIGATE_AUTH_ENABLED", "true").lower() != "false"
 
 
+def is_insecure_mode_allowed() -> bool:
+    """True when the operator explicitly accepts running without auth (BUG-037)."""
+    return os.environ.get("OBSIGATE_ALLOW_INSECURE", "false").lower() in ("1", "true", "yes", "on")
+
+
+def bind_host_from_argv(argv: list[str] | None = None) -> str | None:
+    """Extract the ``--host`` value from the process arguments (uvicorn), if any.
+
+    Returns ``None`` when no explicit host is passed (uvicorn then defaults to
+    loopback ``127.0.0.1``).
+    """
+    args = sys.argv if argv is None else argv
+    for i, arg in enumerate(args):
+        if arg == "--host" and i + 1 < len(args):
+            return args[i + 1]
+        if arg.startswith("--host="):
+            return arg.split("=", 1)[1]
+    return None
+
+
+def is_loopback_host(host: str | None) -> bool:
+    """True when *host* is a loopback address (or unset → uvicorn default)."""
+    if not host:
+        return True
+    normalized = host.strip().strip("[]").lower()
+    return normalized in _LOOPBACK_HOSTS
+
+
 def get_current_user(
     request: Request,
     credentials: HTTPAuthorizationCredentials | None = Depends(security),