fix/various fixes

api/app/core/cos_url_keys.py

@@ -0,0 +1,43 @@
+"""从 URL 解析当前环境腾讯云 COS object key（仅当 host 与配置一致时）。"""
+
+from urllib.parse import urlparse
+
+from app.core.config import settings
+
+
+def extract_cos_object_key_if_owned(url: str | None) -> str | None:
+    """
+    若 url 指向 settings 中配置的 COS 域名，返回去掉前导 / 的 object key。
+    非 http(s)、或 host 不匹配时返回 None。
+    """
+    if not url:
+        return None
+    s = str(url).strip()
+    if not s.startswith(("http://", "https://")):
+        return None
+    parsed = urlparse(s)
+    host = (parsed.netloc or "").lower()
+    if not host:
+        return None
+
+    candidates: list[str] = []
+    bucket = (settings.tencent_cos_bucket or "").strip().lower()
+    region = (settings.tencent_cos_region or "").strip().lower()
+    if bucket and region:
+        candidates.append(f"{bucket}.cos.{region}.myqcloud.com")
+    base = (settings.tencent_cos_base_url or "").strip()
+    if base:
+        base_parsed = urlparse(base if "://" in base else f"https://{base}")
+        bh = (base_parsed.netloc or "").lower()
+        if bh:
+            candidates.append(bh)
+
+    if not candidates:
+        return None
+
+    matched = any(host == c for c in candidates if c)
+    if not matched:
+        return None
+
+    key = (parsed.path or "").lstrip("/")
+    return key or None