Add dynamic CSS support (#4940)

* Add dynamic CSS support

Together with https://github.com/dani-garcia/bw_web_builds/pull/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 <[email protected]>

* Add versions and fallback to built-in

- Add both Vaultwarden and web-vault versions to the css_options.
- Fallback to the inner templates if rendering or compiling the scss fails.
  This ensures the basics are always working even if someone breaks the templates.

Signed-off-by: BlackDex <[email protected]>

* 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 <[email protected]>

* Updated the wiki link in the user template

---------

Signed-off-by: BlackDex <[email protected]>

2 files changed, 106 insertions, 0 deletions

diff --git a/src/static/templates/scss/user.vaultwarden.scss.hbs b/src/static/templates/scss/user.vaultwarden.scss.hbs
new file mode 100644
index 00000000..c0b8ed2a
--- /dev/null
+++ b/src/static/templates/scss/user.vaultwarden.scss.hbs
@@ -0,0 +1 @@
+/* See the wiki for examples and details: https://github.com/dani-garcia/vaultwarden/wiki/Customize-Vaultwarden-CSS */
diff --git a/src/static/templates/scss/vaultwarden.scss.hbs b/src/static/templates/scss/vaultwarden.scss.hbs
new file mode 100644
index 00000000..3fc3e70e
--- /dev/null
+++ b/src/static/templates/scss/vaultwarden.scss.hbs
@@ -0,0 +1,105 @@
+/**** 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;
+}
+/**** 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}}
+
+/* Hide `Email` 2FA if mail is not enabled */
+{{#unless mail_enabled}}
+app-two-factor-setup ul.list-group.list-group-2fa li.list-group-item:nth-child(5) {
+  @extend %vw-hide;
+}
+{{/unless}}
+
+/* Hide `YubiKey OTP security key` 2FA if it is not enabled */
+{{#unless yubico_enabled}}
+app-two-factor-setup ul.list-group.list-group-2fa li.list-group-item:nth-child(2) {
+  @extend %vw-hide;
+}
+{{/unless}}
+
+/* Hide Emergency Access if not allowed */
+{{#unless emergency_access_allowed}}
+bit-nav-item[route="settings/emergency-access"] {
+  @extend %vw-hide;
+}
+{{/unless}}
+
+/* Hide Sends if not allowed */
+{{#unless sends_allowed}}
+bit-nav-item[route="sends"] {
+  @extend %vw-hide;
+}
+{{/unless}}
+/**** End Dynamic Vaultwarden Changes ****/
+/**** Include a special user stylesheet for custom changes ****/
+{{#if load_user_scss}}
+{{> scss/user.vaultwarden.scss }}
+{{/if}}