Fix fallback code to actually work

The fallback now works by using an alternative `reg!` macro.
This adds an extra template register which prefixes the template with `fallback_`.

Signed-off-by: BlackDex <black.dex@gmail.com>

src/api/web.rs

@@ -96,16 +96,17 @@ fn vaultwarden_css() -> Cached<Css<String>> {
         "yubico_enabled": CONFIG._enable_yubico() && (CONFIG.yubico_client_id().is_some() == CONFIG.yubico_secret_key().is_some()),
         "emergency_access_allowed": CONFIG.emergency_access_allowed(),
         "sends_allowed": CONFIG.sends_allowed(),
+        "load_user_scss": true,
     });
 
     let scss = match CONFIG.render_template("scss/vaultwarden.scss", &css_options) {
         Ok(t) => t,
         Err(e) => {
-            // Something went wrong loading the template. Fallback to the built-in templates
+            // Something went wrong loading the template. Use the fallback
             warn!("Loading scss/vaultwarden.scss.hbs or scss/user.vaultwarden.scss.hbs failed. {e}");
             CONFIG
-                .render_inner_template("scss/vaultwarden.scss", &css_options)
-                .expect("Inner scss/vaultwarden.scss.hbs to render")
+                .render_fallback_template("scss/vaultwarden.scss", &css_options)
+                .expect("Fallback scss/vaultwarden.scss.hbs to render")
         }
     };
 
@@ -115,11 +116,13 @@ fn vaultwarden_css() -> Cached<Css<String>> {
     ) {
         Ok(css) => css,
         Err(e) => {
-            // Something went wrong compiling the scss. Fallback to the built-in tempaltes
+            // Something went wrong compiling the scss. Use the fallback
             warn!("Compiling the Vaultwarden SCSS styles failed. {e}");
+            let mut css_options = css_options;
+            css_options["load_user_scss"] = json!(false);
             let scss = CONFIG
-                .render_inner_template("scss/vaultwarden.scss", &css_options)
-                .expect("Inner scss/vaultwarden.scss.hbs to render");
+                .render_fallback_template("scss/vaultwarden.scss", &css_options)
+                .expect("Fallback scss/vaultwarden.scss.hbs to render");
             grass_compiler::from_string(
                 scss,
                 &grass_compiler::Options::default().style(grass_compiler::OutputStyle::Compressed),

src/config.rs

@@ -1269,14 +1269,14 @@ impl Config {
             let hb = load_templates(CONFIG.templates_folder());
             hb.render(name, data).map_err(Into::into)
         } else {
-            self.render_inner_template(name, data)
+            let hb = &self.inner.read().unwrap().templates;
+            hb.render(name, data).map_err(Into::into)
         }
     }
 
-    #[inline]
-    pub fn render_inner_template<T: serde::ser::Serialize>(&self, name: &str, data: &T) -> Result<String, Error> {
+    pub fn render_fallback_template<T: serde::ser::Serialize>(&self, name: &str, data: &T) -> Result<String, Error> {
         let hb = &self.inner.read().unwrap().templates;
-        hb.render(name, data).map_err(Into::into)
+        hb.render(&format!("fallback_{name}"), data).map_err(Into::into)
     }
 
     pub fn set_rocket_shutdown_handle(&self, handle: rocket::Shutdown) {
@@ -1317,6 +1317,11 @@ where
             reg!($name);
             reg!(concat!($name, $ext));
         }};
+        (@withfallback $name:expr) => {{
+            let template = include_str!(concat!("static/templates/", $name, ".hbs"));
+            hb.register_template_string($name, template).unwrap();
+            hb.register_template_string(concat!("fallback_", $name), template).unwrap();
+        }};
     }
 
     // First register default templates here
@@ -1360,7 +1365,7 @@ where
 
     reg!("404");
 
-    reg!("scss/vaultwarden.scss");
+    reg!(@withfallback "scss/vaultwarden.scss");
     reg!("scss/user.vaultwarden.scss");
 
     // And then load user templates to overwrite the defaults

src/static/templates/scss/vaultwarden.scss.hbs

@@ -62,19 +62,7 @@ app-organization-plans > form > bit-section:nth-child(2) {
 app-security > app-two-factor-setup > form {
   @extend %vw-hide;
 }
-
-/* Replace the Bitwarden Shield at the top left with a Vaultwarden icon */
-.bwi-shield:before {
-  content: "" !important;
-  width: 32px !important;
-  height: 40px !important;
-  display: block !important;
-  background-image: url(../images/icon-white.png) !important;
-  background-repeat: no-repeat;
-  background-position-y: bottom;
-}
 /**** END Static Vaultwarden Changes ****/
-
 /**** START Dynamic Vaultwarden Changes ****/
 {{#if signup_disabled}}
 /* Hide the register link on the login screen */
@@ -111,6 +99,7 @@ bit-nav-item[route="sends"] {
 }
 {{/unless}}
 /**** End Dynamic Vaultwarden Changes ****/
-
 /**** Include a special user stylesheet for custom changes ****/
+{{#if load_user_scss}}
 {{> scss/user.vaultwarden.scss }}
+{{/if}}