From 0fc754ad67b9c67b578c8b4ecb1618cf3f21a380 Mon Sep 17 00:00:00 2001
From: Betsy George <144842468+betsygeo@users.noreply.github.com>
Date: Thu, 17 Jul 2025 14:27:04 -0400
Subject: [PATCH] #146 Adding optional kubeconfig encoding variable (#164)

* encoding input variable added

* encoding input variable added

* encoding input variable added

* corrected unit tests

* corrected unit tests

* prettier edits

* working on tests

* working on tests

* working on tests

* minor edits

* minor edits

* better logic structure

* added tests for edge cases

* edited to enum
---
 action.yml                      |  4 ++++
 src/kubeconfigs/default.test.ts | 42 +++++++++++++++++++++++++++++++++
 src/kubeconfigs/default.ts      | 22 ++++++++++++++++-
 3 files changed, 67 insertions(+), 1 deletion(-)

diff --git a/action.yml b/action.yml
index a4e773d..62ddedb 100644
--- a/action.yml
+++ b/action.yml
@@ -13,6 +13,10 @@ inputs:
    kubeconfig:
       description: 'Contents of kubeconfig file'
       required: false
+   kubeconfig-encoding:
+      description: 'Encoding of the kubeconfig input. Accepts "plaintext" (default) or "base64".'
+      required: false
+      default: 'plaintext'
    context:
       description: 'If your kubeconfig has multiple contexts, use this field to use a specific context, otherwise the default one would be chosen'
       required: false
diff --git a/src/kubeconfigs/default.test.ts b/src/kubeconfigs/default.test.ts
index 2cb80a5..e1bf4db 100644
--- a/src/kubeconfigs/default.test.ts
+++ b/src/kubeconfigs/default.test.ts
@@ -1,4 +1,5 @@
 import * as fs from 'fs'
+import * as core from '@actions/core'
 import {getRequiredInputError} from '../../tests/util'
 import {createKubeconfig, getDefaultKubeconfig} from './default'
 
@@ -62,6 +63,47 @@ describe('Default kubeconfig', () => {
 
          expect(getDefaultKubeconfig()).toBe(kc)
       })
+
+      test('returns kubeconfig as plaintext when encoding is plaintext', () => {
+         const kc = 'example kc'
+         jest.spyOn(core, 'getInput').mockImplementation((name: string) => {
+            if (name === 'method') return 'default'
+            if (name === 'kubeconfig-encoding') return 'plaintext'
+            if (name === 'kubeconfig') return kc
+            return ''
+         })
+         expect(getDefaultKubeconfig()).toBe(kc)
+      })
+
+      test('it gets default config through base64 kubeconfig input', () => {
+         const kc = 'example kc'
+         const base64Kc = Buffer.from(kc, 'utf-8').toString('base64')
+
+         jest.spyOn(core, 'getInput').mockImplementation((name: string) => {
+            if (name === 'method') return 'default'
+            if (name === 'kubeconfig-encoding') return 'base64'
+            if (name === 'kubeconfig') return base64Kc
+            return ''
+         })
+
+         expect(getDefaultKubeconfig()).toBe(kc)
+      })
+
+      test('it throws error for unknown kubeconfig-encoding', () => {
+         const kc = 'example kc'
+         const unknownEncoding = 'foobar'
+
+         jest.spyOn(core, 'getInput').mockImplementation((name: string) => {
+            if (name === 'method') return 'default'
+            if (name === 'kubeconfig-encoding') return unknownEncoding
+            if (name === 'kubeconfig') return kc
+            return ''
+         })
+
+         expect(() => getDefaultKubeconfig()).toThrow(
+            "Invalid kubeconfig-encoding: 'foobar'. Must be 'plaintext' or 'base64'."
+         )
+      })
    })
 
    test('it defaults to default method', () => {
diff --git a/src/kubeconfigs/default.ts b/src/kubeconfigs/default.ts
index c98278e..9c19a93 100644
--- a/src/kubeconfigs/default.ts
+++ b/src/kubeconfigs/default.ts
@@ -44,7 +44,27 @@ export function getDefaultKubeconfig(): string {
       }
       default: {
          core.debug('Setting context using kubeconfig')
-         return core.getInput('kubeconfig', {required: true})
+         enum Encoding {
+            Base64 = 'base64',
+            Plaintext = 'plaintext'
+         }
+
+         const rawKubeconfig = core.getInput('kubeconfig', {required: true})
+         const encoding =
+            core.getInput('kubeconfig-encoding')?.toLowerCase() ||
+            Encoding.Plaintext
+
+         if (encoding !== Encoding.Base64 && encoding !== Encoding.Plaintext) {
+            throw new Error(
+               `Invalid kubeconfig-encoding: '${encoding}'. Must be 'plaintext' or 'base64'.`
+            )
+         }
+         const kubeconfig =
+            encoding === Encoding.Base64
+               ? Buffer.from(rawKubeconfig, 'base64').toString('utf-8')
+               : rawKubeconfig
+
+         return kubeconfig
       }
    }
 }