fix(admin): sign CSRF tokens and escape them in scripts (#2071)

fluxer_admin/src/routes/auth.rs

@@ -348,7 +348,7 @@ fn oauth_callback_page(config: &AdminConfig, code: Option<&str>, state: Option<&
     )
 }
 
-fn json_string(value: &str) -> String {
+pub(crate) fn json_string(value: &str) -> String {
     serde_json::to_string(value)
         .expect("JSON string serialization cannot fail")
         .replace('<', "\\u003c")

fluxer_admin/src/routes/mod.rs

@@ -73,7 +73,10 @@ pub fn build_router(config: AdminConfig) -> Router {
         .route("/", get(dashboard))
         .route("/dashboard", get(dashboard))
         .layer(from_fn(middleware::htmx::flash_redirect_to_toast))
-        .layer(from_fn(middleware::csrf::csrf_protection))
+        .layer(from_fn_with_state(
+            state.clone(),
+            middleware::csrf::csrf_protection,
+        ))
         .layer(from_fn(middleware::self_hosted::self_hosted_override))
         .layer(from_fn_with_state(
             state.clone(),