Add Docker `TAGLINE` env customization for modern frontend slogan (#794)

* Initial plan

* Add Docker TAGLINE env customization for modern UI slogan

Agent-Logs-Url: https://github.com/librespeed/speedtest/sessions/e1da6e0e-5194-453d-bffb-961ed782e215

Co-authored-by: sstidl <12804296+sstidl@users.noreply.github.com>

* Refine TAGLINE replacement and expand E2E coverage

Agent-Logs-Url: https://github.com/librespeed/speedtest/sessions/e1da6e0e-5194-453d-bffb-961ed782e215

Co-authored-by: sstidl <12804296+sstidl@users.noreply.github.com>

* Fix TAGLINE sed delimiter and add apostrophe tagline E2E test

- Switch TAGLINE sed from '#' to '/' delimiter so html_escape'd
  apostrophes (&#39;) don't break the sed expression
- Add standalone-apostrophe Docker service with TAGLINE="It'd rather be fast!"
- Add standaloneApostrophe URL (port 18186) to env.js
- Add E2E test asserting the apostrophe tagline renders correctly

Agent-Logs-Url: https://github.com/librespeed/speedtest/sessions/ebe265a8-4b1e-49b5-959a-66133ea0ab3a

Co-authored-by: sstidl <12804296+sstidl@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: sstidl <12804296+sstidl@users.noreply.github.com>

Dockerfile

@@ -32,6 +32,7 @@ COPY docker/entrypoint.sh /
 
 # Prepare default environment variables
 ENV TITLE=LibreSpeed
+ENV TAGLINE="No Flash, No Java, No Websockets, No Bullsh*t"
 ENV MODE=standalone
 ENV PASSWORD=password
 ENV TELEMETRY=false

Dockerfile.alpine

@@ -46,6 +46,7 @@ COPY docker/entrypoint.sh /
 
 # Prepare default environment variables
 ENV TITLE=LibreSpeed
+ENV TAGLINE="No Flash, No Java, No Websockets, No Bullsh*t"
 ENV MODE=standalone
 ENV PASSWORD=password
 ENV TELEMETRY=false

doc_docker.md

@@ -33,6 +33,7 @@ services:
     environment:
       MODE: standalone
       #TITLE: "LibreSpeed"
+      #TAGLINE: "No Flash, No Java, No Websockets, No Bullsh*t"
       #TELEMETRY: "false"
       #ENABLE_ID_OBFUSCATION: "false"
       #REDACT_IP_ADDRESSES: "false"
@@ -57,6 +58,7 @@ The test can be accessed on port 80.
 Here's a list of additional environment variables available in this mode:
 
 * __`TITLE`__: Title of your speed test. Default value: `LibreSpeed`
+* __`TAGLINE`__: Slogan shown below the heading on the modern frontend (`index-modern.html`). Default value: `No Flash, No Java, No Websockets, No Bullsh*t`
 * __`USE_NEW_DESIGN`__: When set to `true`, enables the new modern frontend design. When set to `false` (default), uses the classic design. The design can also be switched using URL parameters (`?design=new` or `?design=old`). Default value: `false`
 * __`SERVER_LIST_URL`__: When set, both frontend designs load their server list from this URL instead of the generated or mounted `server-list.json`. This is useful if you want the containerized frontend to consume a remote shared server list.
 * __`TELEMETRY`__: Whether to enable telemetry or not. If enabled, you maybe want your data to be persisted. See below. Default value: `false`

docker/entrypoint.sh

@@ -108,6 +108,15 @@ if [[ "$MODE" == "frontend" || "$MODE" == "dual" ||  "$MODE" == "standalone" ]];
     sed -i "s/<title>LibreSpeed<\\/title>/<title>$TITLE_ESCAPED<\\/title>/g" /var/www/html/index.html
     sed -i "s/<title>LibreSpeed - Free and Open Source Speedtest<\\/title>/<title>$TITLE_ESCAPED - Free and Open Source Speedtest<\\/title>/g; s/<h1>Free and Open Source Speedtest\\.<\\/h1>/<h1>$TITLE_ESCAPED<\\/h1>/g" /var/www/html/index-modern.html
   fi
+
+  # Replace modern page tagline if TAGLINE is set
+  if [ -n "$TAGLINE" ]; then
+    TAGLINE_ONE_LINE=${TAGLINE//$'\r'/}
+    TAGLINE_ONE_LINE=${TAGLINE_ONE_LINE//$'\n'/ }
+    TAGLINE_HTML_ESCAPED=$(html_escape "$TAGLINE_ONE_LINE")
+    TAGLINE_ESCAPED=$(sed_escape "$TAGLINE_HTML_ESCAPED")
+    sed -i "s/<p class=\"tagline\">No Flash, No Java, No Websockets, No Bullsh\\*t<\\/p>/<p class=\"tagline\">$TAGLINE_ESCAPED<\\/p>/g" /var/www/html/index-modern.html
+  fi
   
   # Support legacy EMAIL env var as fallback for GDPR_EMAIL
   if [ -z "$GDPR_EMAIL" ] && [ ! -z "$EMAIL" ]; then

tests/docker-compose-playwright.yml

@@ -27,9 +27,22 @@ services:
       - WEBPORT=8080
       - USE_NEW_DESIGN=true
       - 'TITLE=Grüße "Tempo" ''Österreich'''
+      - 'TAGLINE=No "Flash", <No Java>, No Websockets & No Bullsh*t'
     ports:
       - "18185:8080"
 
+  standalone-apostrophe:
+    build:
+      context: ..
+      dockerfile: Dockerfile
+    environment:
+      - MODE=standalone
+      - WEBPORT=8080
+      - USE_NEW_DESIGN=true
+      - "TAGLINE=It'd rather be fast!"
+    ports:
+      - "18186:8080"
+
   backend:
     build:
       context: ..

tests/e2e/helpers/env.js

@@ -4,6 +4,7 @@ const baseUrls = {
   frontend: 'http://127.0.0.1:18182',
   dual: 'http://127.0.0.1:18183',
   standaloneNew: 'http://127.0.0.1:18185',
+  standaloneApostrophe: 'http://127.0.0.1:18186',
 };
 
 module.exports = {

tests/e2e/modes.spec.js

@@ -2,6 +2,8 @@ const { test, expect } = require('@playwright/test');
 const { baseUrls } = require('./helpers/env');
 const { modernStartButton } = require('./helpers/ui');
 
+const defaultTagline = 'No Flash, No Java, No Websockets, No Bullsh*t';
+
 test.describe('Runtime mode smoke coverage', () => {
   test('standalone exposes UI and local backend endpoints', async ({ page, request }) => {
     const root = await request.get(`${baseUrls.standalone}/`);
@@ -18,6 +20,7 @@ test.describe('Runtime mode smoke coverage', () => {
 
     await page.goto(`${baseUrls.standalone}/index-modern.html`);
     await expect(modernStartButton(page)).toBeVisible();
+    await expect(page.locator('main > p.tagline')).toHaveText(defaultTagline);
   });
 
   test('backend exposes only local backend contract endpoints', async ({ request }) => {

tests/e2e/title-special-chars.spec.js

@@ -2,16 +2,24 @@ const { test, expect } = require('@playwright/test');
 const { baseUrls } = require('./helpers/env');
 
 const specialTitle = 'Grüße "Tempo" \'Österreich\'';
+const specialTagline = 'No "Flash", <No Java>, No Websockets & No Bullsh*t';
+const apostropheTagline = "It'd rather be fast!";
 
-test.describe('TITLE special characters', () => {
+test.describe('TITLE and TAGLINE special characters', () => {
   test('modern page title supports umlauts and quotes', async ({ page }) => {
     await page.goto(`${baseUrls.standaloneNew}/index-modern.html`);
     await expect(page).toHaveTitle(`${specialTitle} - Free and Open Source Speedtest`);
     await expect(page.locator('main > h1')).toHaveText(specialTitle);
+    await expect(page.locator('main > p.tagline')).toHaveText(specialTagline);
   });
 
   test('classic heading supports umlauts and quotes', async ({ page }) => {
     await page.goto(`${baseUrls.standaloneNew}/index-classic.html`);
     await expect(page.locator('h1').first()).toHaveText(specialTitle);
   });
+
+  test('modern page tagline renders apostrophe correctly', async ({ page }) => {
+    await page.goto(`${baseUrls.standaloneApostrophe}/index-modern.html`);
+    await expect(page.locator('main > p.tagline')).toHaveText(apostropheTagline);
+  });
 });