feat(kubernetes): support rancher with path prefix

Signed-off-by: Jeff Stein <jeff@jeffvstein.org>

.changeset/proud-coins-laugh.md

@@ -0,0 +1,5 @@
+---
+'@backstage/plugin-kubernetes': patch
+---
+
+Support Rancher urls with an existing path component

plugins/kubernetes/src/utils/clusterLinks/formatters/rancher.test.ts

@@ -99,4 +99,19 @@ describe('clusterLinks - rancher formatter', () => {
       'https://k8s.foo.com/explorer/autoscaling.horizontalpodautoscaler/bar/foobar',
     );
   });
+  it('should support subpaths in dashboardUrl', () => {
+    const url = rancherFormatter({
+      dashboardUrl: new URL('https://k8s.foo.com/dashboard/c/c-28a4b/'),
+      object: {
+        metadata: {
+          name: 'foobar',
+          namespace: 'bar',
+        },
+      },
+      kind: 'Deployment',
+    });
+    expect(url.href).toBe(
+      'https://k8s.foo.com/dashboard/c/c-28a4b/explorer/apps.deployment/bar/foobar',
+    );
+  });
 });

plugins/kubernetes/src/utils/clusterLinks/formatters/rancher.ts

@@ -28,9 +28,9 @@ export function rancherFormatter(options: ClusterLinksFormatterOptions): URL {
   const namespace = options.object.metadata?.namespace;
   const validKind = kindMappings[options.kind.toLocaleLowerCase('en-US')];
   if (validKind && name && namespace) {
-    result.pathname = `explorer/${validKind}/${namespace}/${name}`;
+    result.pathname += `explorer/${validKind}/${namespace}/${name}`;
   } else if (namespace) {
-    result.pathname = 'explorer/workload';
+    result.pathname += 'explorer/workload';
   }
   return result;
 }