Refactor entire project (#39)

- Use more modern TypeScript conventions
- Use JavaScript Kubernetes Client
- Add unit tests
- Add integration tests
- Add TypeScript compile verify workflow
- Switch codeowners

src/kubeconfigs/default.ts

@@ -0,0 +1,82 @@
+import * as core from "@actions/core";
+import * as jsyaml from "js-yaml";
+import { K8sSecret, parseK8sSecret } from "../types/k8sSecret";
+import { Method, parseMethod } from "../types/method";
+
+/**
+ * Gets the kubeconfig based on provided method for a default Kubernetes cluster
+ * @returns The kubeconfig
+ */
+export function getDefaultKubeconfig(): string {
+  const method: Method | undefined = parseMethod(
+    core.getInput("method", { required: true })
+  );
+
+  switch (method) {
+    case Method.SERVICE_ACCOUNT: {
+      const clusterUrl = core.getInput("k8s-url", { required: true });
+      core.debug(
+        "Found clusterUrl. Creating kubeconfig using certificate and token"
+      );
+
+      const k8sSecret: string = core.getInput("k8s-secret", {
+        required: true,
+      });
+      const parsedK8sSecret: K8sSecret = parseK8sSecret(jsyaml.load(k8sSecret));
+      const certAuth: string = parsedK8sSecret.data["ca.crt"];
+      const token: string = Buffer.from(
+        parsedK8sSecret.data.token,
+        "base64"
+      ).toString();
+
+      return createKubeconfig(certAuth, token, clusterUrl);
+    }
+    case Method.SERVICE_PRINCIPAL: {
+      core.warning(
+        "Service Principal method not supported for default cluster type"
+      );
+    }
+    case undefined: {
+      core.warning("Defaulting to kubeconfig method");
+    }
+    default: {
+      core.debug("Setting context using kubeconfig");
+      return core.getInput("kubeconfig", { required: true });
+    }
+  }
+}
+
+/**
+ * Creates a kubeconfig and returns the string representation
+ * @param certAuth The certificate authentication of the cluster
+ * @param token The user token
+ * @param clusterUrl The server url of the cluster
+ * @returns The kubeconfig as a string
+ */
+export function createKubeconfig(
+  certAuth: string,
+  token: string,
+  clusterUrl: string
+): string {
+  const kubeconfig = {
+    apiVersion: "v1",
+    kind: "Config",
+    clusters: [
+      {
+        cluster: {
+          "certificate-authority-data": certAuth,
+          server: clusterUrl,
+        },
+      },
+    ],
+    users: [
+      {
+        user: {
+          token: token,
+        },
+      },
+    ],
+  };
+
+  return JSON.stringify(kubeconfig);
+}