From f4d278eae4bcb259a966b9a03bba2dd41ed39f04 Mon Sep 17 00:00:00 2001
From: GinHa <15201596918@163.com>
Date: Mon, 6 Jul 2026 15:58:50 +0800
Subject: [PATCH] =?UTF-8?q?=E7=9C=9F=E4=BA=BA=E7=B4=A0=E6=9D=90=E5=BA=93?=
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---
 video-gen-api/app/services/private_portrait/ark_client.py | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/video-gen-api/app/services/private_portrait/ark_client.py b/video-gen-api/app/services/private_portrait/ark_client.py
index e5ce0463..c2078a1d 100644
--- a/video-gen-api/app/services/private_portrait/ark_client.py
+++ b/video-gen-api/app/services/private_portrait/ark_client.py
@@ -149,7 +149,11 @@ class ArkPrivateAssetClient:
             )
         }
         service = Service(service_info, api_info)
-        raw = service.json(action.value, {}, payload)
+
+        # volcengine SDK 在签名阶段会对 request.body 做 hashlib.sha256(body)。
+        # Python 3 下 hashlib.sha256 只能接收 bytes/bytearray，不能接收 dict 或 str。
+        body = json.dumps(payload, ensure_ascii=False, separators=(",", ":")).encode("utf-8")
+        raw = service.json(action.value, {}, body)
 
         resp = self._normalize_response(raw)
         metadata = resp.get("ResponseMetadata") if isinstance(resp, dict) else None