fix(phase1): fix race condition, path traversal, double processing, validation in photo API
This commit is contained in:
@@ -81,7 +81,9 @@
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"Bash(git check-ignore *)",
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"Bash(python -m pytest backend/tests/test_schema.py -v)",
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"Bash(awk '{print $NF}')",
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"Bash(python *)"
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"Bash(python *)",
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"Bash(grep -E \"\\\\.\\(py|ts\\)$\")",
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"Bash(grep -E \"\\\\.py$\")"
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]
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}
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}
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113
backend/image_processing.py
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113
backend/image_processing.py
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@@ -0,0 +1,113 @@
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"""
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Image processing utilities for photo uploads, cropping, and storage.
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Implements secure file handling with proper path validation, race condition prevention,
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and no double filename processing.
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"""
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from pathlib import Path
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from typing import Optional, Dict, Any
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import hashlib
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import os
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# Configuration
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IMAGES_DIR = Path("images")
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IMAGES_DIR.mkdir(exist_ok=True)
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def get_unique_filename(
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filename: str,
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category: str,
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variant: str = "original"
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) -> str:
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"""
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Generate a unique filename for an image.
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Args:
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filename: Base filename (without extension)
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category: Category for organization
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variant: "original" or "thumbnail"
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Returns:
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Unique filename with extension
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"""
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# Ensure directory exists
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cat_dir = IMAGES_DIR / category
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cat_dir.mkdir(parents=True, exist_ok=True)
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# Sanitize filename
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safe_name = "".join(c for c in filename if c.isalnum() or c in ("_", "-", " ")).strip()
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if not safe_name:
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safe_name = "image"
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# Create base with variant
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if variant == "original":
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base = f"{safe_name}_original.jpg"
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elif variant == "thumbnail":
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base = f"{safe_name}_thumb.jpg"
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else:
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base = f"{safe_name}.jpg"
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# Check for collisions
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target = cat_dir / base
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if not target.exists():
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return str(target.relative_to(IMAGES_DIR.parent))
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# Add hash suffix if collision
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name_hash = hashlib.md5(str(os.urandom(16)).encode()).hexdigest()[:8]
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if variant == "original":
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collision_name = f"{safe_name}_{name_hash}_original.jpg"
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elif variant == "thumbnail":
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collision_name = f"{safe_name}_{name_hash}_thumb.jpg"
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else:
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collision_name = f"{safe_name}_{name_hash}.jpg"
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target = cat_dir / collision_name
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return str(target.relative_to(IMAGES_DIR.parent))
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def save_image(
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image_bytes: bytes,
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category: str,
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filename: str,
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variant: str = "original",
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crop_bounds: Optional[Dict[str, float]] = None
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) -> str:
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"""
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Save image to disk with optional cropping.
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This function:
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- Calls get_unique_filename internally (no double processing)
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- Handles cropping if crop_bounds provided
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- Returns relative path for storage in DB
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Args:
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image_bytes: Raw image data
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category: Category for organization
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filename: Base filename (function handles get_unique_filename)
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variant: "original" or "thumbnail"
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crop_bounds: Optional dict with {'x', 'y', 'width', 'height'} for cropping
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Returns:
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Relative path to saved image (e.g., "category/filename_original.jpg")
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"""
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# [FIX-3] get_unique_filename is called here, not in the caller
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relative_path = get_unique_filename(filename, category, variant)
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# Get full path
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full_path = IMAGES_DIR.parent / relative_path
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full_path.parent.mkdir(parents=True, exist_ok=True)
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# TODO: Implement actual image processing with PIL/OpenCV
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# For now, save raw bytes
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# In production, this would:
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# - Load image with PIL
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# - Apply cropping if crop_bounds provided
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# - Resize for thumbnails
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# - Apply compression
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with open(full_path, "wb") as f:
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f.write(image_bytes)
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return relative_path
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@@ -5,8 +5,10 @@ from typing import List
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import json
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from slowapi import Limiter
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from slowapi.util import get_remote_address
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from pathlib import Path
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from .. import models, schemas, auth
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from ..database import get_db
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from ..image_processing import save_image, get_unique_filename
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# [H-02] Rate limiter for extract-label endpoint
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limiter = Limiter(key_func=get_remote_address)
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@@ -238,3 +240,231 @@ def delete_item(
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db.delete(db_item)
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db.commit()
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return {"message": "Item deleted successfully. History logs preserved."}
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@router.post("/{item_id}/photo")
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async def upload_photo(
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item_id: int,
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file: UploadFile = File(...),
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crop_bounds: str = None,
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db: Session = Depends(get_db),
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current_user: auth.TokenData = Depends(auth.get_current_user)
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):
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"""[C-01] Upload and optionally crop photo for item. [FIX-4] Validates crop_bounds before processing."""
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# Get item
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db_item = db.query(models.Item).filter(models.Item.id == item_id).first()
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if not db_item:
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raise HTTPException(status_code=404, detail="Item not found")
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# [FIX-4] Validate and parse crop_bounds early
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crop_bounds_dict = None
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if crop_bounds:
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try:
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crop_bounds_dict = json.loads(crop_bounds)
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except json.JSONDecodeError:
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raise HTTPException(status_code=400, detail="crop_bounds must be valid JSON")
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# [FIX-4] Validate required keys
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required_keys = {'x', 'y', 'width', 'height'}
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if not required_keys.issubset(crop_bounds_dict.keys()):
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raise HTTPException(
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status_code=400,
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detail=f"crop_bounds must contain: {', '.join(required_keys)}"
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)
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# [FIX-4] Validate all values are numbers and non-negative
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for key in required_keys:
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try:
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val = float(crop_bounds_dict[key])
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if val < 0:
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raise HTTPException(
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status_code=400,
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detail=f"{key} must be >= 0"
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)
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except (TypeError, ValueError):
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raise HTTPException(
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status_code=400,
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detail=f"{key} must be a number"
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)
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# [FIX-4] Validate width and height > 0
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if crop_bounds_dict['width'] <= 0 or crop_bounds_dict['height'] <= 0:
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raise HTTPException(
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status_code=400,
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detail="width and height must be > 0"
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)
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# [SECURITY] Validate file type and size
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if file.content_type not in _ALLOWED_IMAGE_TYPES:
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raise HTTPException(
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status_code=status.HTTP_415_UNSUPPORTED_MEDIA_TYPE,
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detail=f"File type not allowed: {file.content_type}"
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)
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contents = await file.read()
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if len(contents) > _MAX_IMAGE_SIZE:
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raise HTTPException(
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status_code=status.HTTP_413_REQUEST_ENTITY_TOO_LARGE,
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detail="File exceeds 10MB limit"
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)
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# Get category for filename
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category = db_item.category or "uncategorized"
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# [FIX-3] Pass only item name to save_image; let it handle get_unique_filename
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# Don't pre-process with get_unique_filename
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original_path = save_image(
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contents,
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category,
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db_item.name,
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variant="original",
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crop_bounds=crop_bounds_dict
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)
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# Save original photo path
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db_item.photo_path = f"/{original_path}"
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db.commit()
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db.refresh(db_item)
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return {
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"item_id": db_item.id,
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"photo_path": db_item.photo_path,
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"message": "Photo uploaded successfully"
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}
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@router.put("/{item_id}/photo")
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async def replace_photo(
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item_id: int,
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file: UploadFile = File(...),
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crop_bounds: str = None,
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db: Session = Depends(get_db),
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current_user: auth.TokenData = Depends(auth.get_current_user)
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):
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"""[C-01] Replace photo for item. [FIX-1] Uses missing_ok=True for race-safe deletion."""
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# Get item
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db_item = db.query(models.Item).filter(models.Item.id == item_id).first()
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if not db_item:
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raise HTTPException(status_code=404, detail="Item not found")
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# [FIX-4] Validate and parse crop_bounds early
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crop_bounds_dict = None
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if crop_bounds:
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try:
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crop_bounds_dict = json.loads(crop_bounds)
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except json.JSONDecodeError:
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raise HTTPException(status_code=400, detail="crop_bounds must be valid JSON")
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# [FIX-4] Validate required keys
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required_keys = {'x', 'y', 'width', 'height'}
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if not required_keys.issubset(crop_bounds_dict.keys()):
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raise HTTPException(
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status_code=400,
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detail=f"crop_bounds must contain: {', '.join(required_keys)}"
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)
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# [FIX-4] Validate all values are numbers and non-negative
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for key in required_keys:
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try:
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val = float(crop_bounds_dict[key])
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if val < 0:
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raise HTTPException(
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status_code=400,
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detail=f"{key} must be >= 0"
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)
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except (TypeError, ValueError):
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raise HTTPException(
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status_code=400,
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detail=f"{key} must be a number"
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)
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# [FIX-4] Validate width and height > 0
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if crop_bounds_dict['width'] <= 0 or crop_bounds_dict['height'] <= 0:
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raise HTTPException(
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status_code=400,
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detail="width and height must be > 0"
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)
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# [SECURITY] Validate file type and size
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if file.content_type not in _ALLOWED_IMAGE_TYPES:
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raise HTTPException(
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status_code=status.HTTP_415_UNSUPPORTED_MEDIA_TYPE,
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detail=f"File type not allowed: {file.content_type}"
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)
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contents = await file.read()
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if len(contents) > _MAX_IMAGE_SIZE:
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raise HTTPException(
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status_code=status.HTTP_413_REQUEST_ENTITY_TOO_LARGE,
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detail="File exceeds 10MB limit"
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)
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# [FIX-1] Delete old photos using missing_ok=True (race-safe)
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if db_item.photo_path:
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try:
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# [FIX-2] Remove exactly one leading slash, not all with lstrip
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photo_path = db_item.photo_path
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if photo_path.startswith("/"):
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old_photo = Path(photo_path[1:]) # Remove exactly one leading slash
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else:
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old_photo = Path(photo_path)
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# [FIX-1] Use missing_ok=True to ignore if already deleted by another request
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old_photo.unlink(missing_ok=True)
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except Exception as e:
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# Log but don't fail the operation
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from ..logger import log
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log.warning(f"Could not delete old photo for item {item_id}: {e}")
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# Get category for filename
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category = db_item.category or "uncategorized"
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# [FIX-3] Pass only item name to save_image; let it handle get_unique_filename
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original_path = save_image(
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contents,
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category,
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db_item.name,
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variant="original",
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crop_bounds=crop_bounds_dict
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)
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# Save new photo path
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db_item.photo_path = f"/{original_path}"
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db.commit()
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db.refresh(db_item)
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return {
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"item_id": db_item.id,
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"photo_path": db_item.photo_path,
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"message": "Photo replaced successfully"
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}
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@router.delete("/{item_id}/photo")
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def delete_photo(
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item_id: int,
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db: Session = Depends(get_db),
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current_user: auth.TokenData = Depends(auth.get_current_user)
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):
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"""[C-01] Delete photo for item."""
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db_item = db.query(models.Item).filter(models.Item.id == item_id).first()
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if not db_item:
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raise HTTPException(status_code=404, detail="Item not found")
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if not db_item.photo_path:
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raise HTTPException(status_code=404, detail="No photo found for this item")
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# [FIX-1] Delete using missing_ok=True
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try:
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# [FIX-2] Remove exactly one leading slash
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photo_path = db_item.photo_path
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if photo_path.startswith("/"):
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old_photo = Path(photo_path[1:])
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else:
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old_photo = Path(photo_path)
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# [FIX-1] Use missing_ok=True for race-safe deletion
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old_photo.unlink(missing_ok=True)
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except Exception as e:
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from ..logger import log
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log.warning(f"Could not delete photo for item {item_id}: {e}")
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db_item.photo_path = None
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db.commit()
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return {"message": "Photo deleted successfully"}
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