新增头像接口：POST /profiles/me/avatar 上传、DELETE /profiles/me/avatar 删除

app/routers/profiles.py

@@ -1,7 +1,8 @@
 import math
 import uuid
+from typing import Annotated
 
-from fastapi import APIRouter, HTTPException, Query, status
+from fastapi import APIRouter, File, HTTPException, Query, UploadFile, status
 from sqlalchemy import func, select
 from sqlalchemy.exc import IntegrityError
 from sqlalchemy.orm import joinedload
@@ -10,6 +11,7 @@ from app.deps import AdminUser, CurrentUser, DbSession, OptionalUser
 from app.models import Cloud, Profile, User, UserCollection
 from app.schemas import CloudOut, PageOut, ProfileOut, ProfileStatsOut, ProfileUpdateIn, PublicProfileOut
 from app.serializers import cloud_out, profile_out, public_profile_out
+from app.services.storage import delete_files, save_avatar
 
 
 router = APIRouter(prefix="/profiles", tags=["用户资料"])
@@ -38,6 +40,37 @@ async def update_my_profile(
     return profile_out(user.profile)
 
 
+@router.post("/me/avatar", response_model=ProfileOut)
+async def upload_avatar(
+    image: Annotated[UploadFile, File()],
+    user: CurrentUser,
+    db: DbSession,
+) -> ProfileOut:
+    if user.profile.avatar_path:
+        old_path = user.profile.avatar_path
+        user.profile.avatar_path = None
+        await db.commit()
+        await delete_files([old_path])
+    avatar_path = await save_avatar(image, user.id)
+    user.profile.avatar_path = avatar_path
+    await db.commit()
+    return profile_out(user.profile)
+
+
+@router.delete("/me/avatar", response_model=ProfileOut)
+async def delete_avatar(
+    user: CurrentUser,
+    db: DbSession,
+) -> ProfileOut:
+    if not user.profile.avatar_path:
+        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="没有头像")
+    old_path = user.profile.avatar_path
+    user.profile.avatar_path = None
+    await db.commit()
+    await delete_files([old_path])
+    return profile_out(user.profile)
+
+
 @router.get("/{user_id}/stats", response_model=ProfileStatsOut)
 async def get_user_stats(
     user_id: uuid.UUID,

app/services/storage.py

@@ -12,6 +12,7 @@ from app.config import settings
 
 logger = logging.getLogger(__name__)
 ALLOWED_FORMATS = {"JPEG": "jpg", "PNG": "png", "WEBP": "webp"}
+AVATAR_MAX_EDGE = 512
 
 
 def _process_image(raw: bytes) -> tuple[bytes, str, bytes]:
@@ -105,3 +106,38 @@ async def delete_files(paths: list[str]) -> None:
                 logger.exception("删除图片失败：%s", relative_path)
 
     await asyncio.to_thread(remove)
+
+
+async def save_avatar(file: UploadFile, user_id: uuid.UUID) -> str:
+    raw = await file.read(settings.max_upload_bytes + 1)
+    if not raw:
+        raise HTTPException(status_code=status.HTTP_422_UNPROCESSABLE_ENTITY, detail="图片不能为空")
+    if len(raw) > settings.max_upload_bytes:
+        raise HTTPException(status_code=status.HTTP_413_REQUEST_ENTITY_TOO_LARGE, detail="图片文件过大")
+
+    def process() -> str:
+        Image.MAX_IMAGE_PIXELS = settings.max_image_pixels
+        try:
+            with Image.open(io.BytesIO(raw)) as source:
+                if source.format not in ALLOWED_FORMATS:
+                    raise ValueError("仅支持 JPEG、PNG 和 WebP 图片")
+                source = source.convert("RGB")
+                source.thumbnail(
+                    (AVATAR_MAX_EDGE, AVATAR_MAX_EDGE),
+                    Image.Resampling.LANCZOS,
+                )
+                relative_path = Path("avatars") / f"{user_id}.jpg"
+                target = settings.upload_dir / relative_path
+                target.parent.mkdir(parents=True, exist_ok=True)
+                source.save(target, format="JPEG", quality=85, optimize=True)
+                return relative_path.as_posix()
+        except (UnidentifiedImageError, OSError, Image.DecompressionBombError, ValueError) as exc:
+            raise ValueError(str(exc) or "图片内容无效") from exc
+
+    try:
+        return await asyncio.to_thread(process)
+    except ValueError as exc:
+        raise HTTPException(
+            status_code=status.HTTP_422_UNPROCESSABLE_ENTITY,
+            detail=f"图片无法处理：{exc}",
+        ) from exc