node/deps/npm/node_modules/npm-registry-client/lib/authify.js

module.exports = authify

function authify (authed, parsed, headers, credentials) {
  if (credentials && credentials.token) {
    this.log.verbose("request", "using bearer token for auth")
    headers.authorization = "Bearer " + credentials.token

    return null
  }

  if (authed) {
    if (credentials && credentials.username && credentials.password) {
      var username = encodeURIComponent(credentials.username)
      var password = encodeURIComponent(credentials.password)
      parsed.auth = username + ":" + password
    }
    else {
      return new Error(
        "This request requires auth credentials. Run `npm login` and repeat the request."
      )
    }
  }
}