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var npm = require('./npm.js')
var output = require('./utils/output.js')

module.exports = whoami

whoami.usage = 'npm whoami [--registry <registry>]\n(just prints username according to given registry)'

function whoami (args, silent, cb) {
  // FIXME: need tighter checking on this, but is a breaking change
  if (typeof cb !== 'function') {
    cb = silent
    silent = false
  }

  var registry = npm.config.get('registry')
  if (!registry) return cb(new Error('no default registry set'))

  var auth = npm.config.getCredentialsByURI(registry)
  if (auth) {
    if (auth.username) {
      if (!silent) output(auth.username)
      return process.nextTick(cb.bind(this, null, auth.username))
    } else if (auth.token) {
      return npm.registry.whoami(registry, { auth: auth }, function (er, username) {
        if (er) return cb(er)
        if (!username) {
          var needNewSession = new Error(
            'Your auth token is no longer valid. Please log in again.'
          )
          needNewSession.code = 'ENEEDAUTH'
          return cb(needNewSession)
        }

        if (!silent) output(username)
        cb(null, username)
      })
    }
  }

  // At this point, if they have a credentials object, it doesn't have a token
  // or auth in it.  Probably just the default registry.
  var needAuth = new Error(
    'this command requires you to be logged in.'
  )
  needAuth.code = 'ENEEDAUTH'
  process.nextTick(cb.bind(this, needAuth))
}