fix(client): accept whitespace in screenshot base64

client/src/cmbuyer_client/device/baseline.py

@@ -27,6 +27,7 @@ from .adb import AdbClient, DeviceInspection
 PDD_PACKAGE = "com.xunmeng.pinduoduo"
 SCREENSHOT_PARAMS = [1, 80]
 HIERARCHY_PARAMS = [False, 50]
+_BASE64_ASCII_WHITESPACE = " \t\r\n"
 
 
 class BaselineCaptureError(RuntimeError):
@@ -172,17 +173,21 @@ def _extract_version(app_info: dict[str, Any]) -> str:
 
 
 def _save_base64_screenshot(value: Any, target: Path) -> None:
-    """严格解码 RPC 截图，并用 Pillow 验证后保存 PNG；没有 adb fallback。"""
+    """规范化常见 ASCII Base64 空白后严格解码；没有 adb screenshot fallback。"""
 
     if not isinstance(value, str) or not value:
         raise BaselineCaptureError("截图 RPC 未返回 base64 数据，拒绝发布不完整取证。")
     try:
-        raw_image = base64.b64decode(value.encode("ascii"), validate=True)
+        normalized = value.translate({ord(character): None for character in _BASE64_ASCII_WHITESPACE})
+        raw_image = base64.b64decode(normalized.encode("ascii"), validate=True)
+    except (UnicodeEncodeError, ValueError, binascii.Error) as error:
+        raise BaselineCaptureError("截图 RPC Base64 语法无效，拒绝发布不完整取证。") from error
+    try:
         with Image.open(BytesIO(raw_image)) as image:
             image.load()
             image.save(target, format="PNG")
-    except (UnicodeEncodeError, ValueError, binascii.Error, UnidentifiedImageError, OSError) as error:
-        raise BaselineCaptureError("截图 RPC 返回的数据不是有效图像，拒绝发布不完整取证。") from error
+    except (UnidentifiedImageError, OSError) as error:
+        raise BaselineCaptureError("截图 RPC 图像数据无效，拒绝发布不完整取证。") from error
 
 
 def _validate_hierarchy(value: Any) -> None: