Add dynamic CSS support

Together with dani-garcia/bw_web_builds#180 this PR will add support for dynamic CSS changes.

For example, we could hide the register link if signups are not allowed.
In the future show or hide the SSO button depending on if it is enabled or not.

There also is a special `user.vaultwarden.scss` file so that users can add custom CSS without the need to modify the default (static) changes.
This will prevent future changes from not being applied and still have the custom user changes to be added.

Also added a special redirect when someone goes directly to `/index.html` as that might cause issues with loading other scripts and files.

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

Cargo.toml

@@ -163,6 +163,9 @@ argon2 = "0.5.3"
 # Reading a password from the cli for generating the Argon2id ADMIN_TOKEN
 rpassword = "7.3.1"
 
+# Loading a dynamic CSS Stylesheet
+grass_compiler = { version = "0.13.4", default-features = false }
+
 # Strip debuginfo from the release builds
 # The symbols are the provide better panic traces
 # Also enable fat LTO and use 1 codegen unit for optimizations

src/api/web.rs

@@ -1,6 +1,12 @@
 use std::path::{Path, PathBuf};
 
-use rocket::{fs::NamedFile, http::ContentType, response::content::RawHtml as Html, serde::json::Json, Catcher, Route};
+use rocket::{
+    fs::NamedFile,
+    http::ContentType,
+    response::{content::RawCss as Css, content::RawHtml as Html, Redirect},
+    serde::json::Json,
+    Catcher, Route,
+};
 use serde_json::Value;
 
 use crate::{
@@ -16,7 +22,7 @@ pub fn routes() -> Vec<Route> {
     // crate::utils::LOGGED_ROUTES to make sure they appear in the log
     let mut routes = routes![attachments, alive, alive_head, static_files];
     if CONFIG.web_vault_enabled() {
-        routes.append(&mut routes![web_index, web_index_head, app_id, web_files]);
+        routes.append(&mut routes![web_index, web_index_direct, web_index_head, app_id, web_files, vaultwarden_css]);
     }
 
     #[cfg(debug_assertions)]
@@ -45,11 +51,32 @@ fn not_found() -> ApiResult<Html<String>> {
     Ok(Html(text))
 }
 
+#[get("/css/vaultwarden.css")]
+fn vaultwarden_css() -> Cached<Css<String>> {
+    let css_options = json!({
+        "signup_disabled": !CONFIG.signups_allowed() && CONFIG.signups_domains_whitelist().is_empty(),
+    });
+    let scss = CONFIG.render_template("scss/vaultwarden.scss", &css_options).expect("Rendered scss/vaultwarden.scss");
+    let css = grass_compiler::from_string(
+        scss,
+        &grass_compiler::Options::default().style(grass_compiler::OutputStyle::Compressed),
+    )
+    .expect("scss/vaultwarden.scss to compile");
+    Cached::short(Css(css), false)
+}
+
 #[get("/")]
 async fn web_index() -> Cached<Option<NamedFile>> {
     Cached::short(NamedFile::open(Path::new(&CONFIG.web_vault_folder()).join("index.html")).await.ok(), false)
 }
 
+// Make sure that `/index.html` redirect to actual domain path.
+// If not, this might cause issues with the web-vault
+#[get("/index.html")]
+fn web_index_direct() -> Redirect {
+    Redirect::to(format!("{}/", CONFIG.domain_path()))
+}
+
 #[head("/")]
 fn web_index_head() -> EmptyResult {
     // Add an explicit HEAD route to prevent uptime monitoring services from

src/config.rs

@@ -1352,6 +1352,9 @@ where
 
     reg!("404");
 
+    reg!("scss/vaultwarden.scss");
+    reg!("scss/user.vaultwarden.scss");
+
     // And then load user templates to overwrite the defaults
     // Use .hbs extension for the files
     // Templates get registered with their relative name

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

@@ -0,0 +1,2 @@
+/**** START Custom User Changes ****/
+/**** END Custom User Changes ****/

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

@@ -0,0 +1,88 @@
+/**** START Static Vaultwarden changes ****/
+/* This combines all selectors extending it into one */
+%vw-hide {
+  display: none !important;
+}
+
+/* This allows searching for the combined style in the browsers dev-tools (look into the head tag) */
+.vw-hide,
+head {
+  @extend %vw-hide;
+}
+
+/* Hide the Subscription Page tab */
+bit-nav-item[route="settings/subscription"] {
+  @extend %vw-hide;
+}
+
+/* Hide any link pointing to Free Bitwarden Families */
+a[href$="/settings/sponsored-families"] {
+  @extend %vw-hide;
+}
+
+/* Hide the `Enterprise Single Sign-On` button on the login page */
+a[routerlink="/sso"] {
+  @extend %vw-hide;
+}
+
+/* Hide Two-Factor menu in Organization settings */
+bit-nav-item[route="settings/two-factor"],
+a[href$="/settings/two-factor"] {
+  @extend %vw-hide;
+}
+
+/* Hide Business Owned checkbox */
+app-org-info > form:nth-child(1) > div:nth-child(3) {
+  @extend %vw-hide;
+}
+
+/* Hide the `This account is owned by a business` checkbox and label */
+#ownedBusiness,
+label[for^="ownedBusiness"] {
+  @extend %vw-hide;
+}
+
+/* Hide the radio button and label for the `Custom` org user type */
+#userTypeCustom,
+label[for^="userTypeCustom"] {
+  @extend %vw-hide;
+}
+
+/* Hide Business Name */
+app-org-account form div bit-form-field.tw-block:nth-child(3) {
+  @extend %vw-hide;
+}
+
+/* Hide organization plans */
+app-organization-plans > form > bit-section:nth-child(2) {
+  @extend %vw-hide;
+}
+
+/* Hide Device Verification form at the Two Step Login screen */
+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 */
+app-frontend-layout > app-login > form > div > div > div > p {
+  @extend %vw-hide;
+}
+{{/if}}
+/**** End Dynamic Vaultwarden Changes ****/
+
+/**** Include a special user stylesheet for custom changes ****/
+{{> scss/user.vaultwarden.scss }}