Authorization header code sometimes invokes `new Buffer(undefined)`

[paulmelnikow]

Hi, I'm seeing this exception in Shields:

NodeError: The first argument must be one of type string, Buffer, ArrayBuffer, Array, or Array-like Object. Received type undefined
  File "buffer.js", line 195, in Function.from
  File "buffer.js", line 170, in new Buffer
  File "/home/m/shields/node_modules/camp/lib/camp.js", line 63, in augmentReqRes
    var up = new Buffer(authComponent[1], 'base64').toString().split(':');
  File "/home/m/shields/node_modules/camp/lib/camp.js", line 398, in listener
    augmentReqRes(req, res, server);
  File "/home/m/shields/node_modules/camp/lib/camp.js", line 364, in SecureCamp.<anonymous>
    server.on('request', function(req, res) { listener(server, req, res) });
...
(3 additional frame(s) were not displayed)

NodeError: The first argument must be one of type string, Buffer, ArrayBuffer, Array, or Array-like Object. Received type undefined

This is the line of code:

sc/lib/camp.js

Line 64 in 2d0e916

var up = new Buffer(authComponent[1], 'base64').toString().split(':');

Shields is running camp 17.2.1 in production, though it doesn't look like this code has been touched recently.

[paulmelnikow]

Sentry link for Shields: https://sentry.io/shields/shields/issues/561620553

Added: This issue still exists as of 17.2.2.