fix: harden alicdn image downloads

scripts/test_alicdn_download.py

@@ -0,0 +1,74 @@
+import asyncio
+from pathlib import Path
+
+import httpx
+
+
+TEST_URL = "https://img.alicdn.com/imgextra/i1/O1CN01959PmC2MK7jvMhqXF_!!4611686018427385312-0-amp.jpg"
+OUTPUT_DIR = Path(__file__).resolve().parents[1] / "tmp_alicdn_download"
+
+CONTENT_TYPE_TO_SUFFIX = {
+    "image/jpeg": ".jpg",
+    "image/jpg": ".jpg",
+    "image/png": ".png",
+    "image/webp": ".webp",
+    "image/avif": ".avif",
+}
+
+DEFAULT_HEADERS = {
+    "User-Agent": (
+        "Mozilla/5.0 (Windows NT 10.0; Win64; x64) "
+        "AppleWebKit/537.36 (KHTML, like Gecko) "
+        "Chrome/133.0.0.0 Safari/537.36"
+    ),
+    "Accept": "image/avif,image/webp,image/apng,image/svg+xml,image/*,*/*;q=0.8",
+    "Accept-Language": "zh-CN,zh;q=0.9,en;q=0.8",
+    "Cache-Control": "no-cache",
+    "Pragma": "no-cache",
+    "Referer": "https://www.taobao.com/",
+}
+
+
+async def download_once(client: httpx.AsyncClient, url: str):
+    response = await client.get(url, headers=DEFAULT_HEADERS)
+    print(f"HTTP {response.status_code}")
+    content_type = response.headers.get("content-type", "").split(";", 1)[0].strip().lower()
+    print(f"Content-Type: {content_type}")
+    if response.status_code != 200:
+        print(response.text[:300])
+        response.raise_for_status()
+
+    suffix = CONTENT_TYPE_TO_SUFFIX.get(content_type, ".bin")
+    output_path = OUTPUT_DIR / f"alicdn_test{suffix}"
+    output_path.parent.mkdir(parents=True, exist_ok=True)
+    output_path.write_bytes(response.content)
+    print(f"Saved to: {output_path}")
+    print(f"Size: {output_path.stat().st_size} bytes")
+
+
+async def main():
+    timeout = httpx.Timeout(60.0, connect=20.0)
+    async with httpx.AsyncClient(timeout=timeout, follow_redirects=True) as client:
+        last_error = None
+        referers = [
+            "https://www.taobao.com/",
+            "https://item.taobao.com/",
+            "https://detail.tmall.com/",
+        ]
+        for idx, referer in enumerate(referers, 1):
+            try:
+                DEFAULT_HEADERS["Referer"] = referer
+                print(f"Attempt {idx} with Referer={referer}")
+                await download_once(client, TEST_URL)
+                print("Download success")
+                return
+            except Exception as e:
+                last_error = e
+                print(f"Attempt {idx} failed: {type(e).__name__}: {e}")
+                await asyncio.sleep(1)
+
+        raise RuntimeError(f"All attempts failed: {last_error}")
+
+
+if __name__ == "__main__":
+    asyncio.run(main())

services/service_auto_image_pipeline.py

@@ -2,6 +2,7 @@ import asyncio
 import hashlib
 import json
 import logging
+import mimetypes
 import os
 import re
 from pathlib import Path
@@ -25,6 +26,30 @@ AUTO_PROCESS_CATEGORY = os.getenv("AUTO_PROCESS_CATEGORY", "设计素材")
 AUTO_PROCESS_ROOT = Path(
     os.getenv("AUTO_PROCESS_ROOT", str(Path(__file__).resolve().parents[1] / "runtime" / "auto_processed"))
 )
+_DOWNLOAD_REFERERS = (
+    "https://www.taobao.com/",
+    "https://item.taobao.com/",
+    "https://detail.tmall.com/",
+)
+_DOWNLOAD_HEADERS = {
+    "User-Agent": (
+        "Mozilla/5.0 (Windows NT 10.0; Win64; x64) "
+        "AppleWebKit/537.36 (KHTML, like Gecko) "
+        "Chrome/133.0.0.0 Safari/537.36"
+    ),
+    "Accept": "image/avif,image/webp,image/apng,image/svg+xml,image/*,*/*;q=0.8",
+    "Accept-Language": "zh-CN,zh;q=0.9,en;q=0.8",
+    "Cache-Control": "no-cache",
+    "Pragma": "no-cache",
+}
+_CONTENT_TYPE_SUFFIX = {
+    "image/jpeg": ".jpg",
+    "image/jpg": ".jpg",
+    "image/png": ".png",
+    "image/webp": ".webp",
+    "image/avif": ".avif",
+    "image/gif": ".gif",
+}
 
 
 def _safe_name(text: str, fallback: str = "image") -> str:
@@ -55,13 +80,56 @@ class AutoImagePipelineService:
     def __init__(self):
         self.customer_db = CustomerDatabase()
 
+    @staticmethod
+    def _resolve_download_path(dest_path: Path, content_type: str, image_url: str) -> Path:
+        normalized_type = str(content_type or "").split(";", 1)[0].strip().lower()
+        suffix = _CONTENT_TYPE_SUFFIX.get(normalized_type, "")
+        if not suffix:
+            guessed, _ = mimetypes.guess_type(str(image_url or ""))
+            suffix = _CONTENT_TYPE_SUFFIX.get(str(guessed or "").lower(), "")
+        suffix = suffix or dest_path.suffix or ".bin"
+        return dest_path.with_suffix(suffix)
+
     async def _download_image(self, image_url: str, dest_path: Path) -> Path:
         dest_path.parent.mkdir(parents=True, exist_ok=True)
-        async with httpx.AsyncClient(timeout=60.0, follow_redirects=True) as client:
-            response = await client.get(image_url)
+        timeout = httpx.Timeout(60.0, connect=20.0)
+        last_error: Optional[Exception] = None
+
+        async with httpx.AsyncClient(timeout=timeout, follow_redirects=True) as client:
+            for referer in _DOWNLOAD_REFERERS:
+                for attempt in range(1, 4):
+                    headers = dict(_DOWNLOAD_HEADERS)
+                    headers["Referer"] = referer
+                    try:
+                        response = await client.get(image_url, headers=headers)
+                        if response.status_code in (403, 420, 429):
+                            raise httpx.HTTPStatusError(
+                                f"download blocked status={response.status_code}",
+                                request=response.request,
+                                response=response,
+                            )
                         response.raise_for_status()
-        dest_path.write_bytes(response.content)
-        return dest_path
+                        resolved_path = self._resolve_download_path(
+                            dest_path,
+                            response.headers.get("content-type", ""),
+                            image_url,
+                        )
+                        resolved_path.write_bytes(response.content)
+                        logger.info(
+                            f"[AutoImagePipeline] 图片下载成功 status={response.status_code} "
+                            f"referer={referer} path={resolved_path}"
+                        )
+                        return resolved_path
+                    except Exception as e:
+                        last_error = e
+                        logger.warning(
+                            f"[AutoImagePipeline] 图片下载失败 attempt={attempt}/3 "
+                            f"referer={referer} url={image_url} err={e}"
+                        )
+                        if attempt < 3:
+                            await asyncio.sleep(attempt)
+
+        raise RuntimeError(f"下载原图失败: {last_error}")
 
     @staticmethod
     def _format_transfer_notice(