DHIS2-21366: restore undefined app icon behaviour to prevent browser clients from breaking

dhis-2/dhis-api/src/main/java/org/hisp/dhis/appmanager/webmodules/WebModule.java

@@ -82,12 +82,14 @@ public static WebModule getModule(App app) {
 
     String defaultAction = app.getLaunchUrl();
 
-    String icon = hasIcon ? app.getBaseUrl() + "/" + app.getIcons().getIcon48() : null;
-
     String description = subString(app.getDescription(), 0, 80);
     String displayDescription = subString(app.getDisplayDescription(), 0, 80);
 
     String key = app.isBundled() ? AppManager.BUNDLED_APP_PREFIX + app.getKey() : app.getKey();
+    String icon =
+        hasIcon
+            ? app.getBaseUrl() + "/" + app.getIcons().getIcon48()
+            : app.getBaseUrl() + "/icons/" + key + ".png";
 
     WebModule module = new WebModule(key, app.getBasePath(), defaultAction);
     module.setIcon(icon);

dhis-2/dhis-test-web-api/src/test/java/org/hisp/dhis/webapi/controller/AppControllerTest.java

@@ -60,6 +60,8 @@
 import org.hisp.dhis.http.HttpStatus;
 import org.hisp.dhis.jsontree.JsonArray;
 import org.hisp.dhis.jsontree.JsonMixed;
+import org.hisp.dhis.jsontree.JsonObject;
+import org.hisp.dhis.jsontree.JsonString;
 import org.hisp.dhis.security.Authorities;
 import org.hisp.dhis.test.config.TestDhisConfigurationProvider;
 import org.hisp.dhis.test.webapi.H2ControllerIntegrationTestBase;
@@ -117,6 +119,25 @@ void cleanUp() {
     DELETE("/userSettings/keyUiLocale/?userId=" + ADMIN_USER_UID);
   }
 
+  @Test
+  void testGetAppMenuWhenInstalledAppWithoutIconInManifest() throws IOException {
+    appManager.installApp(new ClassPathResource("app/test-app-wihout-icon.zip").getFile());
+
+    HttpResponse response = GET("/apps/menu");
+    JsonArray apps = response.content(HttpStatus.OK);
+    String icon =
+        apps.asObject()
+            .get("modules")
+            .asList(JsonObject.class)
+            .get(0)
+            .get("icon")
+            .as(JsonString.class)
+            .string();
+    assertTrue(
+        icon.equals("http://localhost/api/apps/test/icons/test.png")
+            || icon.equals("http://localhost/api/apps/myapp/dhis2-app-icon.png"));
+  }
+
   @Test
   void testGetInstalledAppIndexHtml() throws IOException {
     appManager.installApp(new ClassPathResource("app/test-app-with-index-html.zip").getFile());