From c480f4b886dee68089fa9ae71c09a0f3aadc8c3e Mon Sep 17 00:00:00 2001
From: ls-brentsmith <brent.smith@lightspeedhq.com>
Date: Thu, 26 Apr 2018 20:08:46 -0400
Subject: [PATCH 1/2] Add kubernetes auth method

---
 lib/vault/api/auth.rb | 35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)

diff --git a/lib/vault/api/auth.rb b/lib/vault/api/auth.rb
index 7a0b0eea..161821e7 100644
--- a/lib/vault/api/auth.rb
+++ b/lib/vault/api/auth.rb
@@ -264,6 +264,41 @@ def gcp(role, jwt, path = 'gcp')
       return secret
     end
 
+    # Authenticate via the kubernetes authentication method. If authentication is
+    # successful, the resulting token will be stored on the client and used
+    # for future requests.
+    #
+    # @example
+    #   Vault.auth.kubernetes("default", "/var/run/secrets/kubernetes.io/serviceaccount/token")
+    #   #=> #<Vault::Secret lease_id="">
+    #
+    # @param [String] role
+    # @param [String] service_account_path optional
+    #   Path on filesystem of service account token secret.
+    # @param [String] route optional
+    #
+    # @return [Secret]
+    def kubernetes(role, service_account_path = nil, route = nil)
+      route ||= '/v1/auth/kubernetes/login'
+      service_account_path ||=
+        '/var/run/secrets/kubernetes.io/serviceaccount/token'
+
+      payload = {
+        role: role,
+        jwt: File.read(service_account_path)
+      }
+
+      json = client.post(
+        route,
+        JSON.fast_generate(payload)
+      )
+
+      secret = Secret.decode(json)
+      client.token = secret.auth.client_token
+
+      return secret
+    end
+
     # Authenticate via a TLS authentication method. If authentication is
     # successful, the resulting token will be stored on the client and used
     # for future requests.

From 5219a2b6c0f9a7219b7422f0680688ea515aa496 Mon Sep 17 00:00:00 2001
From: Austin Heiman <atheimanksu@gmail.com>
Date: Fri, 7 Jun 2019 12:18:57 -0500
Subject: [PATCH 2/2] tried to add a spec

---
 spec/unit/auth_spec.rb | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/spec/unit/auth_spec.rb b/spec/unit/auth_spec.rb
index 74b0f63f..4323e6df 100644
--- a/spec/unit/auth_spec.rb
+++ b/spec/unit/auth_spec.rb
@@ -2,7 +2,22 @@
 
 module Vault
   describe Authenticate do
-    let(:auth) { Authenticate.new(client: nil) }
+    let(:client) { double('client') }
+    let(:auth) { Authenticate.new(client: client) }
+
+    describe '#kubernetes' do
+      before do
+        allow(::File).to receive(:read).with(
+          '/var/run/secrets/kubernetes.io/serviceaccount/token'
+        ).and_return('abc123')
+      end
+
+      it 'authenticates with Kubernetes Auth method' do
+        expect(client).to receive(:post).with('/v1/auth/kubernetes/login', '{"blah": "wrong"}')
+        expect(auth.kubernetes('test-role')).to eq('secret')
+      end
+    end
+
     describe "#region_from_sts_endpoint" do
       subject { auth.send(:region_from_sts_endpoint, sts_endpoint) }