Missing certificate authentication mechanism

[sudiptosarkar]

We are missing TLS based authentication here. The documentation for the same can be found here: TLS Certificates - Auth Methods.

This is needed to get the token. Right now, we can create the client to use the client certificate and private key, but there's nothing to get the token:

const client = vault({ apiVersion: 'v1', endpoint: 'https://localhost:8200', requestOptions: { key: fs.readFileSync('./config/vaultClientAuthKey.pem'), cert: fs.readFileSync('./config/vaultClientAuthCert.pem'), ca: fs.readFileSync('./config/vaultCaCert.pem') } });

We need to add support for certAuth, so we can get the token, something like this:

client.certLogin(res => client.token = res.auth.client_token);

[aviadhahami]

Hey @sudiptosarkar
Saw your PR, lgtm

We're in the middle of a handover so this will get merged asap; Thx for yur contribution!