show build version in html

rust/src/webserver/webserver.rs

@@ -22,6 +22,12 @@ struct SSIDList<'a> {
     ssids: Vec<&'a String<32>>,
 }
 
+#[derive(Serialize, Debug)]
+struct VersionInfo<'a> {
+    git_hash: &'a str,
+    build_time: &'a str
+}
+
 pub fn httpd_initial(reboot_now: Arc<AtomicBool>) -> Box<EspHttpServer<'static>> {
     let mut server = shared();
     server
@@ -170,7 +176,14 @@ pub fn shared() -> Box<EspHttpServer<'static>> {
     server
         .fn_handler("/version", Method::Get, |request| {
             let mut response = request.into_ok_response()?;
-            response.write(env!("VERGEN_GIT_DESCRIBE").as_bytes())?;
+            let git_hash = env!("VERGEN_GIT_DESCRIBE");
+            let build_time = env!("VERGEN_BUILD_TIMESTAMP");
+            let version_info = VersionInfo{
+                git_hash,
+                build_time,
+            };
+            let version_info_json = serde_json::to_string(&version_info)?;
+            response.write(version_info_json.as_bytes())?;
             anyhow::Ok(())
         })
         .unwrap();