feat: ordre naturel des sections Configurations et avatar utilisateur #113

backend/auth/router.py

@@ -2,6 +2,8 @@
 # All /api/auth/* endpoints: login, logout, refresh, me, change-password,
 # and admin user CRUD.
 
+import base64
+import binascii
 import logging
 import re
 
@@ -109,6 +111,43 @@ class UpdateUserRequest(BaseModel):
         return validate_password_strength(v)
 
 
+# ── Profile avatar (#113) ───────────────────────────────────────────
+
+#: Avatar data-URL pattern — PNG/JPEG/WebP only (no SVG: XSS surface).
+_AVATAR_DATA_URL_RE = re.compile(
+    r"^data:image/(?:png|jpeg|webp);base64,[A-Za-z0-9+/]+={0,2}$"
+)
+#: ~300 KB of base64 payload (a 256px JPEG is ~15 KB; generous headroom).
+_AVATAR_MAX_CHARS = 400_000
+
+
+def _validate_avatar(data_url: str) -> str | None:
+    """Validate an avatar data-URL for storage on the user profile.
+
+    Returns the normalized data-URL, or ``None`` when clearing the avatar
+    (empty string).  Raises ``HTTPException(400)`` on anything else.
+    """
+    if data_url == "":
+        return None
+    if len(data_url) > _AVATAR_MAX_CHARS:
+        raise HTTPException(400, "Avatar image too large")
+    if not _AVATAR_DATA_URL_RE.match(data_url):
+        raise HTTPException(400, "Avatar must be a PNG, JPEG or WebP data URL")
+    try:
+        raw = base64.b64decode(data_url.split(",", 1)[1], validate=True)
+    except (ValueError, binascii.Error) as exc:  # pragma: no cover — regex guards
+        raise HTTPException(400, "Avatar payload is not valid base64") from exc
+    # Confirm the decoded bytes really are a supported image (magic numbers).
+    is_png = raw.startswith(b"\x89PNG\r\n\x1a\n")
+    is_jpeg = raw.startswith(b"\xff\xd8\xff")
+    is_webp = (
+        len(raw) >= 12 and raw[:4] == b"RIFF" and raw[8:12] == b"WEBP"
+    )
+    if not (is_png or is_jpeg or is_webp):
+        raise HTTPException(400, "Avatar payload is not a PNG, JPEG or WebP image")
+    return data_url
+
+
 # ── Public endpoints ──────────────────────────────────────────────────
 
 @router.get("/status")
@@ -221,6 +260,7 @@ def _issue_tokens(user: dict, username: str, remember_me: bool, response: Respon
             "display_name": user["display_name"],
             "role": user["role"],
             "vaults": user["vaults"],
+            "avatar": user.get("avatar"),
         },
     }
 
@@ -343,6 +383,7 @@ async def get_me(current_user=Depends(require_auth)):
         "vaults": current_user["vaults"],
         "language": current_user.get("language", "fr"),
         "last_login": current_user.get("last_login"),
+        "avatar": current_user.get("avatar"),
     }
 
 
@@ -350,19 +391,23 @@ class UpdateMeRequest(BaseModel):
     """Fields the user can update on their own profile."""
     display_name: str | None = None
     language: str | None = None
+    #: Image data-URL (PNG/JPEG/WebP), or ``""`` to remove the avatar (#113).
+    avatar: str | None = None
 
 
 @router.patch("/me")
 async def patch_me(req: UpdateMeRequest, current_user=Depends(require_auth)):
-    """Update current user's profile fields (display_name, language)."""
+    """Update current user's profile fields (display_name, language, avatar)."""
     from .user_store import update_user
-    updates = {}
+    updates: dict[str, object] = {}
     if req.display_name is not None:
         updates["display_name"] = req.display_name
     if req.language is not None:
         if req.language not in ("fr", "en"):
             raise HTTPException(400, "language must be 'fr' or 'en'")
         updates["language"] = req.language
+    if req.avatar is not None:
+        updates["avatar"] = _validate_avatar(req.avatar)
     if not updates:
         raise HTTPException(400, "No fields to update")
     updated = update_user(current_user["username"], updates)
@@ -373,6 +418,7 @@ async def patch_me(req: UpdateMeRequest, current_user=Depends(require_auth)):
         "vaults": updated["vaults"],
         "language": updated.get("language", "fr"),
         "last_login": updated.get("last_login"),
+        "avatar": updated.get("avatar"),
     }
 
 

backend/auth/user_store.py

@@ -96,6 +96,7 @@ def create_user(
             "vaults": vaults or [],
             "active": True,
             "language": "fr",  # default UI language
+            "avatar": None,  # profile picture data-URL (#113)
             "created_at": datetime.now(timezone.utc).isoformat(),
             "password_changed_at": datetime.now(timezone.utc).timestamp(),
             "last_login": None,