perf(8502): 并行生图(6并发)+超时重试；视频URL直连预览/下载；路径隔离

modules/path_utils.py

@@ -0,0 +1,93 @@
+"""
+Path utilities for cross-session / cross-project isolation.
+
+Goal:
+- Avoid file overwrites across concurrent users/projects by namespacing all temp artifacts
+  under temp/projects/{project_id}/...
+- Provide safe unique filename helpers.
+"""
+
+from __future__ import annotations
+
+import os
+import re
+import time
+import uuid
+from pathlib import Path
+from typing import Optional
+
+import config
+
+
+_SAFE_CHARS_RE = re.compile(r"[^A-Za-z0-9._-]+")
+
+
+def sanitize_filename(name: str) -> str:
+    """Keep only safe filename characters and strip path separators."""
+    if not isinstance(name, str):
+        return "file"
+    name = name.replace("\\", "_").replace("/", "_").strip()
+    name = _SAFE_CHARS_RE.sub("_", name)
+    return name or "file"
+
+
+def ensure_dir(path: Path) -> Path:
+    path.mkdir(parents=True, exist_ok=True)
+    return path
+
+
+def project_root(project_id: str) -> Path:
+    pid = sanitize_filename(project_id or "UNKNOWN")
+    return ensure_dir(config.TEMP_DIR / "projects" / pid)
+
+
+def project_upload_dir(project_id: str) -> Path:
+    return ensure_dir(project_root(project_id) / "uploads")
+
+
+def project_images_dir(project_id: str) -> Path:
+    return ensure_dir(project_root(project_id) / "images")
+
+
+def project_videos_dir(project_id: str) -> Path:
+    return ensure_dir(project_root(project_id) / "videos")
+
+
+def project_audio_dir(project_id: str) -> Path:
+    return ensure_dir(project_root(project_id) / "audio")
+
+
+def project_compose_dir(project_id: str, output_name: str) -> Path:
+    out = sanitize_filename(output_name or f"compose_{int(time.time())}")
+    return ensure_dir(project_root(project_id) / "compose" / out)
+
+
+def unique_filename(
+    prefix: str,
+    ext: str,
+    project_id: Optional[str] = None,
+    scene_id: Optional[int] = None,
+    extra: Optional[str] = None,
+) -> str:
+    """
+    Build a unique filename.
+    Example: scene_1_PROJ-xxx_173..._a1b2c3.mp4
+    """
+    pfx = sanitize_filename(prefix or "file")
+    e = (ext or "").lstrip(".") or "bin"
+    pid = sanitize_filename(project_id) if project_id else None
+    sid = str(int(scene_id)) if scene_id is not None else None
+    ex = sanitize_filename(extra) if extra else None
+    ts = str(int(time.time() * 1000))
+    rnd = uuid.uuid4().hex[:8]
+    parts = [pfx]
+    if sid:
+        parts.append(f"s{sid}")
+    if pid:
+        parts.append(pid)
+    if ex:
+        parts.append(ex)
+    parts.extend([ts, rnd])
+    return f"{'_'.join(parts)}.{e}"
+
+