From 0c64122b807a1d9f5b4def622dd3ce4d75d00724 Mon Sep 17 00:00:00 2001
From: ZhenYi <434836402@qq.com>
Date: Mon, 20 Apr 2026 15:45:35 +0800
Subject: [PATCH] chore(frontend): update frontend build configuration

---
 libs/frontend/build.rs   | 18 ++++++++++++++----
 libs/frontend/src/lib.rs |  9 ++++++++-
 2 files changed, 22 insertions(+), 5 deletions(-)

diff --git a/libs/frontend/build.rs b/libs/frontend/build.rs
index f895914..17d50c4 100644
--- a/libs/frontend/build.rs
+++ b/libs/frontend/build.rs
@@ -1,3 +1,4 @@
+use md5::compute as md5_hash;
 use std::{env, fs, path::PathBuf, process::Command};
 
 fn run_pnpm(args: &[&str], cwd: &str) {
@@ -66,15 +67,24 @@ fn main() {
         let safe_name = key.replace('/', "_").replace('\\', "_");
         let blob_path = blob_dir.join(&safe_name);
         fs::copy(&file, &blob_path).unwrap();
+
+        // Compute ETag (MD5 hex of content) at build time
+        let content = fs::read(&file).unwrap();
+        let hash = md5_hash(&content);
+        let etag_literal = format!("\"{:x}\"", hash);
+
         let key_literal = format!("\"{}\"", key.replace('"', "\\\""));
-        strs.push(format!("    ({}, include_bytes!(\"dist_blobs/{}\")),", key_literal, safe_name));
+        strs.push(format!(
+            "    ({}, include_bytes!(\"dist_blobs/{}\"), {}),",
+            key_literal, safe_name, etag_literal
+        ));
     }
 
     let out_file = out_dir.join("frontend.rs");
-    let content = format!(
-        "lazy_static::lazy_static! {{\n    pub static ref FRONTEND: Vec<(&'static str, &'static [u8])> = vec![\n{}    ];\n}}\n",
+    let generated = format!(
+        "lazy_static::lazy_static! {{\n    pub static ref FRONTEND: Vec<(&'static str, &'static [u8], &'static str)> = vec![\n{}    ];\n}}\n",
         strs.join("\n")
     );
-    fs::write(&out_file, content).unwrap();
+    fs::write(&out_file, generated).unwrap();
     println!("cargo:include={}", out_file.display());
 }
diff --git a/libs/frontend/src/lib.rs b/libs/frontend/src/lib.rs
index af8c602..3860661 100644
--- a/libs/frontend/src/lib.rs
+++ b/libs/frontend/src/lib.rs
@@ -4,5 +4,12 @@ include!(concat!(env!("OUT_DIR"), "/frontend.rs"));
 
 /// Returns the embedded frontend static asset for the given path, or `None` if not found.
 pub fn get_frontend_asset(path: &str) -> Option<&'static [u8]> {
-    FRONTEND.iter().find(|(k, _)| *k == path).map(|(_, v)| *v)
+    FRONTEND.iter().find(|(k, _, _)| *k == path).map(|(_, v, _)| *v)
+}
+
+/// Returns the embedded frontend static asset and its ETag for the given path.
+pub fn get_frontend_asset_with_etag(path: &str) -> Option<(&'static [u8], &'static str)> {
+    FRONTEND.iter()
+        .find(|(k, _, _)| *k == path)
+        .map(|(_, v, etag)| (v as &_, etag as &_))
 }