Kubeconfigs as file references (#466)

Signed-off-by: Jussi Nummelin <jussi.nummelin@gmail.com>
Co-authored-by: Lauri Nevala <lauri.nevala@gmail.com>
Co-authored-by: Jari Kolehmainen <jari.kolehmainen@gmail.com>

src/main/kubeconfig-manager.ts

@@ -2,14 +2,17 @@ import { app } from "electron"
 import fs from "fs"
 import { ensureDir, randomFileName} from "./file-helpers"
 import logger from "./logger"
+import { Cluster } from "./cluster"
+import * as k8s from "./k8s"
+import { KubeConfig } from "@kubernetes/client-node"
 
 export class KubeconfigManager {
   protected configDir = app.getPath("temp")
-  protected kubeconfig: string
   protected tempFile: string
+  protected cluster: Cluster
 
-  constructor(kubeconfig: string) {
-    this.kubeconfig = kubeconfig
+  constructor(cluster: Cluster) {
+    this.cluster = cluster
     this.tempFile = this.createTemporaryKubeconfig()
   }
 
@@ -17,11 +20,38 @@ export class KubeconfigManager {
     return this.tempFile
   }
 
+  /**
+   * Creates new "temporary" kubeconfig that point to the kubectl-proxy. 
+   * This way any user of the config does not need to know anything about the auth etc. details.
+   */
   protected createTemporaryKubeconfig(): string {
     ensureDir(this.configDir)
     const path = `${this.configDir}/${randomFileName("kubeconfig")}`
-    logger.debug('Creating temporary kubeconfig: ' + path)
-    fs.writeFileSync(path, this.kubeconfig)
+    const originalKc = new KubeConfig()
+    originalKc.loadFromFile(this.cluster.kubeConfigPath)
+    const kc = {
+      clusters: [
+        {
+          name: this.cluster.contextName,
+          server: `http://127.0.0.1:${this.cluster.contextHandler.proxyPort}`
+        }
+      ],
+      users: [
+        {
+          name: "proxy"
+        }
+      ],
+      contexts: [
+        {
+          name: this.cluster.contextName,
+          cluster: this.cluster.contextName,
+          namespace: originalKc.getContextObject(this.cluster.contextName).namespace,
+          user: "proxy"
+        }
+      ],
+      currentContext: this.cluster.contextName
+    } as KubeConfig
+    fs.writeFileSync(path, k8s.dumpConfigYaml(kc))
     return path
   }