From c7dfac83d6306b006a2bbb73974d5debbdb04676 Mon Sep 17 00:00:00 2001
From: Andras Schmelczer <andras@schmelczer.dev>
Date: Sun, 27 Sep 2026 21:36:38 +0100
Subject: [PATCH] Extract into const

---
 sync-server/src/consts.rs         |  5 +++++
 sync-server/src/server.rs         | 13 +++++++------
 sync-server/src/server/history.rs | 12 ++++++------
 3 files changed, 18 insertions(+), 12 deletions(-)

diff --git a/sync-server/src/consts.rs b/sync-server/src/consts.rs
index 341fd9eb..a797309c 100644
--- a/sync-server/src/consts.rs
+++ b/sync-server/src/consts.rs
@@ -27,3 +27,8 @@ pub const DEFAULT_EVENTS_PAGE_SIZE: usize = 64;
 pub const MAX_EVENTS_PAGE_BYTES: usize = 1024 * 1024;
 
 pub const SUPPORTED_API_VERSION: u32 = 4;
+
+pub const HISTORY_HEADER: axum::http::HeaderName =
+    axum::http::HeaderName::from_static("x-vault-link-history");
+pub const HISTORY_MISMATCH_HEADER: axum::http::HeaderName =
+    axum::http::HeaderName::from_static("x-vault-link-history-mismatch");
diff --git a/sync-server/src/server.rs b/sync-server/src/server.rs
index 0cfa87ef..ce41fffb 100644
--- a/sync-server/src/server.rs
+++ b/sync-server/src/server.rs
@@ -1,3 +1,4 @@
+use crate::consts::{HISTORY_HEADER, HISTORY_MISMATCH_HEADER};
 pub mod auth;
 mod device_id_header;
 mod endpoints;
@@ -48,7 +49,10 @@ pub async fn create_server(config: Config) -> Result<()> {
     let app = Router::new()
         .nest("/", create_authenticated_routes(app_state.clone()))
         .route("/", get(endpoints::index::index))
-        .route("/vaults/:vault_id/ping", get(endpoints::ping::ping))
+        .route(
+            "/vaults/:vault_id/config",
+            get(endpoints::get_server_config::get_server_config),
+        )
         .route(
             "/vaults/:vault_id/ws",
             get(endpoints::websocket::websocket_handler),
@@ -65,12 +69,9 @@ pub async fn create_server(config: Config) -> Result<()> {
                     http::header::CONTENT_TYPE,
                     http::header::AUTHORIZATION,
                     DEVICE_ID_HEADER_NAME.clone(),
-                    http::header::HeaderName::from_static("x-vault-link-history"),
-                ])
-                .expose_headers([
-                    http::header::HeaderName::from_static("x-vault-link-history"),
-                    http::header::HeaderName::from_static("x-vault-link-history-mismatch"),
+                    HISTORY_HEADER,
                 ])
+                .expose_headers([HISTORY_HEADER, HISTORY_MISMATCH_HEADER])
                 .allow_methods([Method::GET, Method::PUT]),
         )
         .layer(
diff --git a/sync-server/src/server/history.rs b/sync-server/src/server/history.rs
index 2f851c8f..2a14aaca 100644
--- a/sync-server/src/server/history.rs
+++ b/sync-server/src/server/history.rs
@@ -1,3 +1,4 @@
+use crate::consts::{HISTORY_HEADER, HISTORY_MISMATCH_HEADER};
 use std::collections::HashMap;
 
 use axum::{
@@ -27,7 +28,7 @@ pub async fn history_middleware(
 
     // A restore happens while the server is stopped. Validate before executing
     // any old request, including retries whose numeric parent IDs were reused.
-    if let Some(checkpoint) = req.headers().get("x-vault-link-history") {
+    if let Some(checkpoint) = req.headers().get(HISTORY_HEADER) {
         let checkpoint = checkpoint
             .to_str()
             .map_err(|error| client_error(error.into()))?;
@@ -38,10 +39,9 @@ pub async fn history_middleware(
             .map_err(server_error)?
         {
             let mut response = (StatusCode::CONFLICT, "Server history changed").into_response();
-            response.headers_mut().insert(
-                "x-vault-link-history-mismatch",
-                HeaderValue::from_static("1"),
-            );
+            response
+                .headers_mut()
+                .insert(HISTORY_MISMATCH_HEADER, HeaderValue::from_static("1"));
             return Ok(response);
         }
     }
@@ -54,7 +54,7 @@ pub async fn history_middleware(
             .await
             .map_err(server_error)?;
         response.headers_mut().insert(
-            "x-vault-link-history",
+            HISTORY_HEADER,
             HeaderValue::from_str(&checkpoint).map_err(|error| server_error(error.into()))?,
         );
     }