ARTEMIS-3485 Fix web plugin contexts

Support custom web plugin contexts defined with the `url` attribute
of the `app` element in bootstrap.xml.

artemis-hawtio/activemq-branding/src/main/java/org/apache/activemq/hawtio/branding/PluginContextListener.java

@@ -39,7 +39,7 @@ public class PluginContextListener implements ServletContextListener {
       ServletContext context = servletContextEvent.getServletContext();
 
       plugin = new HawtioPlugin();
-      plugin.setContext((String)context.getInitParameter("plugin-context"));
+      plugin.setContext(context.getContextPath());
       plugin.setName(context.getInitParameter("plugin-name"));
       plugin.setScripts(context.getInitParameter("plugin-scripts"));
       plugin.setDomain(null);

artemis-hawtio/activemq-branding/src/main/webapp/plugin/css/activemq.css

@@ -82,13 +82,6 @@ svg text {
     border-top: 3px solid #B21054;
 }
 
-/* Change the background image for Login page and About modal as well as text color etc*/
-.pf-c-login, .pf-c-about-modal-box__hero {
-  background-image: url("/activemq-branding/plugin/img/login-screen-background.png");
-  background-size: cover;
-  --pf-c-form__label--Color: white;
-}
-
 .pf-c-login__main {
     grid-area: main;
     background-color: transparent;

artemis-hawtio/activemq-branding/src/main/webapp/plugin/js/brandingPlugin.js

@@ -19,6 +19,7 @@
  */
 var Branding = (function (Branding) {
 
+
   /**
    * The name of this plugin
    */
@@ -33,6 +34,11 @@ var Branding = (function (Branding) {
    * The top level path of this plugin on the server
    */
   Branding.contextPath = '/activemq-branding';
+  $.get("plugin", (data) => {
+    if (data.hasOwnProperty('activemq-branding')) {
+      Branding.contextPath = data['activemq-branding'].Context;
+    }
+  });
 
   /**
    * This plugin's AngularJS module instance.
@@ -80,6 +86,18 @@ var Branding = (function (Branding) {
     // favicon settings
     Core.applyBranding(configManager);
 
+    brandingStyle = `
+      <style type='text/css'>
+        /* Change the background image for Login page and About modal as well as text color etc */
+        .pf-c-login, .pf-c-about-modal-box__hero {
+          background-image: url("${Branding.contextPath}/plugin/img/login-screen-background.png");
+          background-size: cover;
+          --pf-c-form__label--Color: white;
+        }
+      </style>
+    `;
+    $(brandingStyle).appendTo("head");
+
     Branding.log.info(Branding.pluginName, "loaded");
   }
   initPlugin.$inject = ['configManager', 'aboutService'];

artemis-hawtio/artemis-console/src/main/webapp/hawtconfig.json

@@ -1,10 +1,10 @@
 {
   "branding": {
     "appName": "Artemis Console",
-    "appLogoUrl": "/activemq-branding/plugin/img/activemq.png",
+    "appLogoUrl": "",
-    "companyLogoUrl": "/activemq-branding/plugin/img/activemq.png",
+    "companyLogoUrl": "",
-    "css": "/activemq-branding/plugin/css/activemq.css",
+    "css": "",
-    "favicon": "/activemq-branding/plugin/img/favicon.png"
+    "favicon": ""
   },
   "login": {
     "description": "ActiveMQ Artemis Management Console",
@@ -20,7 +20,7 @@
     "productInfo": [],
     "additionalInfo": "",
     "copyright": "",
-    "imgSrc": "/activemq-branding/plugin/img/activemq.png"
+    "imgSrc": ""
   },
   "disabledRoutes": []
 }

artemis-hawtio/artemis-plugin/src/main/java/org/apache/activemq/hawtio/plugin/PluginContextListener.java

@@ -39,7 +39,7 @@ public class PluginContextListener implements ServletContextListener {
       ServletContext context = servletContextEvent.getServletContext();
 
       plugin = new HawtioPlugin();
-      plugin.setContext((String)context.getInitParameter("plugin-context"));
+      plugin.setContext(context.getContextPath());
       plugin.setName(context.getInitParameter("plugin-name"));
       plugin.setScripts(context.getInitParameter("plugin-scripts"));
       plugin.setDomain(null);