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var assert = require('assert')

var toNerfDart = require('./nerf-dart.js')

module.exports = getCredentialsByURI

function getCredentialsByURI (uri) {
  assert(uri && typeof uri === 'string', 'registry URL is required')
  var nerfed = toNerfDart(uri)
  var defnerf = toNerfDart(this.get('registry'))

  // hidden class micro-optimization
  var c = {
    scope: nerfed,
    token: undefined,
    password: undefined,
    username: undefined,
    email: undefined,
    auth: undefined,
    alwaysAuth: undefined
  }

  // used to override scope matching for tokens as well as legacy auth
  if (this.get(nerfed + ':always-auth') !== undefined) {
    var val = this.get(nerfed + ':always-auth')
    c.alwaysAuth = val === 'false' ? false : !!val
  } else if (this.get('always-auth') !== undefined) {
    c.alwaysAuth = this.get('always-auth')
  }

  if (this.get(nerfed + ':_authToken')) {
    c.token = this.get(nerfed + ':_authToken')
    // the bearer token is enough, don't confuse things
    return c
  }

  if (this.get(nerfed + ':-authtoken')) {
    c.token = this.get(nerfed + ':-authtoken')
    // the bearer token is enough, don't confuse things
    return c
  }

  // Handle the old-style _auth=<base64> style for the default
  // registry, if set.
  var authDef = this.get('_auth')
  var userDef = this.get('username')
  var passDef = this.get('_password')
  if (authDef && !(userDef && passDef)) {
    authDef = Buffer.from(authDef, 'base64').toString()
    authDef = authDef.split(':')
    userDef = authDef.shift()
    passDef = authDef.join(':')
  }

  if (this.get(nerfed + ':_password')) {
    c.password = Buffer.from(this.get(nerfed + ':_password'), 'base64').toString('utf8')
  } else if (nerfed === defnerf && passDef) {
    c.password = passDef
  }

  if (this.get(nerfed + ':username')) {
    c.username = this.get(nerfed + ':username')
  } else if (nerfed === defnerf && userDef) {
    c.username = userDef
  }

  if (this.get(nerfed + ':email')) {
    c.email = this.get(nerfed + ':email')
  } else if (this.get('email')) {
    c.email = this.get('email')
  }

  if (c.username && c.password) {
    c.auth = Buffer.from(c.username + ':' + c.password).toString('base64')
  }

  return c
}