From 925be4573d3c5f584add5b6908c45a94970dec6d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E7=8E=8B=E5=BE=B7=E5=AE=87?= <kvtodev@outlook.com>
Date: Thu, 24 Sep 2026 18:00:21 +0800
Subject: [PATCH] =?UTF-8?q?=E4=BA=A7=E7=89=A9=E6=89=A9=E5=B1=95=E5=90=8D?=
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- server-rs/crates/platform-tripo/src/common/types.rs：fallback_artifact_extension 补上 image/jpg 分支，非标准写法但确有 provider 这么回，预览图不再落到默认 .glb 后缀
- server-rs/crates/platform-tripo/src/common/types.rs：补用例覆盖 png / jpg / webp 与读不出形态时的 glb 兜底
---
 .../crates/platform-tripo/src/common/types.rs | 25 +++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/server-rs/crates/platform-tripo/src/common/types.rs b/server-rs/crates/platform-tripo/src/common/types.rs
index 0600e6d36..00326cc7d 100644
--- a/server-rs/crates/platform-tripo/src/common/types.rs
+++ b/server-rs/crates/platform-tripo/src/common/types.rs
@@ -293,6 +293,10 @@ fn fallback_artifact_extension(content_type: Option<&str>) -> &'static str {
         "png"
     } else if content_type.starts_with("image/jpeg") {
         "jpg"
+    } else if content_type.starts_with("image/jpg") {
+        // `image/jpg` 不是标准写法，但确有 provider 这么回；落到默认 `.glb` 会让一张
+        // 预览图带上模型后缀，这里按声明值给回 jpg。
+        "jpg"
     } else if content_type.starts_with("image/webp") {
         "webp"
     } else {
@@ -341,6 +345,27 @@ mod tests {
         assert!(!stem.contains('.'), "`..` 必须被中性化：{stem}");
     }
 
+    #[test]
+    fn fallback_extension_follows_the_declared_image_content_type() {
+        assert_eq!(
+            artifact_filename("preview", Some("image/png"), &artifact_url("/artifact")),
+            "preview.png"
+        );
+        assert_eq!(
+            artifact_filename("preview", Some("image/jpg"), &artifact_url("/artifact")),
+            "preview.jpg"
+        );
+        assert_eq!(
+            artifact_filename("preview", Some("image/webp"), &artifact_url("/artifact")),
+            "preview.webp"
+        );
+        // 读不出形态时仍按模型产物兜底。
+        assert_eq!(
+            artifact_filename("model", None, &artifact_url("/artifact")),
+            "model.glb"
+        );
+    }
+
     #[test]
     fn blank_stem_falls_back_to_a_fixed_name() {
         assert_eq!(