JWT Client throws PEM_read_bio:no start line

[justinmanley]

I'm trying to authenticate to the Fusion Tables API using the JWT client. I generated a .p12 file from developers.google.com, and followed the instructions here. Whenever I try to authenticate, I get the following: [Error: error:0906D06C:PEM routines:PEM_read_bio:no start line].

I've trimmed the code down to a minimal example:

#!/usr/bin/env node

var cwd = process.cwd(),
    google = require('googleapis');

var jwtClient = new google.auth.JWT(
    'email@developer.gserviceaccount.com',
    null,
    cwd + '/key.pem',
    ['https://www.googleapis.com/auth/fusiontables'],
    'myemail@gmail.com'
);

jwtClient.authorize(function(authErr) {
    if (authErr) { throw authErr; }
});

I've checked - the path above is correct, and the contents of the .pem file are:

Bag Attributes
    friendlyName: privatekey
    localKeyID: redacted
Key Attributes: <No Attributes>
-----BEGIN PRIVATE KEY-----
redacted
-----END PRIVATE KEY-----

I thought this issue might have to do with an encoding issue, and I looked through some of the auth-token dependencies of this library - but adding { encoding: 'utf8' } to calls to fs.readFile didn't fix the issue.

Any idea what might be causing this?

[justinmanley]

Resolved; I was misusing the .pem arguments.

It would be nice to make clearer in the documentation that the second argument is a path to a .pem file, that the third argument is the body of a .pem file, and that the two should not be used concurrently.

[iwarner]

For completeness - its easier to use the JSON that can also be downloaded

// Key
const key = require('../resources/JSON.json');

// Google JWT Authentication
const jwtClient = new google.auth.JWT(
  key.client_email,
  null,
  key.private_key,
  [scope1],
  null);