Fix memoir image delivery and Android rendering

api/services/pdf_service.py

@@ -13,6 +13,7 @@ from reportlab.platypus import SimpleDocTemplate, Paragraph, Spacer, PageBreak,
 from reportlab.pdfbase import pdfmetrics
 from reportlab.pdfbase.cidfonts import UnicodeCIDFont
 from io import BytesIO
+from services.memoir_images.storage import TencentCosStorageService, resolve_image_storage_key
 
 logger = logging.getLogger(__name__)
 
@@ -42,6 +43,23 @@ def split_content_blocks(content: str, images: list[dict]) -> list[dict]:
     return blocks
 
 
+def _prepare_pdf_image_assets(images: list[dict]) -> list[dict]:
+    storage = TencentCosStorageService.from_env()
+    prepared_assets: list[dict] = []
+
+    for item in images or []:
+        asset = dict(item)
+        storage_key = resolve_image_storage_key(asset)
+        if asset.get("status") == "completed" and storage_key:
+            try:
+                asset["url"] = storage.get_download_url(storage_key)
+            except Exception as exc:
+                logger.warning(f"PDF 图片签名失败: key={storage_key}, error={exc}")
+        prepared_assets.append(asset)
+
+    return prepared_assets
+
+
 class PDFService:
     """PDF 生成服务"""
 
@@ -108,7 +126,7 @@ class PDFService:
             story.append(Paragraph(chapter.title, heading_style))
             story.append(Spacer(1, 0.2 * inch))
 
-            images = getattr(chapter, "images", None) or []
+            images = _prepare_pdf_image_assets(getattr(chapter, "images", None) or [])
             blocks = split_content_blocks(chapter.content, images)
 
             for block in blocks: