PassphraseAbstractKey.php
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	<?php

	abstract class PassphraseAbstractKey extends Phobject {

	private $credential;

	protected function requireCredential() {
	if (!$this->credential) {
	throw new Exception(pht('Credential is required!'));
	}
	return $this->credential;
	}

	private function loadCredential(
	$phid,
	PhabricatorUser $viewer) {

	$credential = id(new PassphraseCredentialQuery())
	->setViewer($viewer)
	->withPHIDs(array($phid))
	->needSecrets(true)
	->executeOne();

	if (!$credential) {
	throw new Exception(pht('Failed to load credential "%s"!', $phid));
	}

	return $credential;
	}

	private function validateCredential(
	PassphraseCredential $credential,
	$provides_type) {

	$type = $credential->getImplementation();

	if (!$type) {
	throw new Exception(
	pht(
	'Credential "%s" is of unknown type "%s"!',
	$credential->getMonogram(),
	$credential->getCredentialType()));
	}

	if ($type->getProvidesType() !== $provides_type) {
	throw new Exception(
	pht(
	'Credential "%s" must provide "%s", but provides "%s"!',
	$credential->getMonogram(),
	$provides_type,
	$type->getProvidesType()));
	}
	}

	protected function loadAndValidateFromPHID(
	$phid,
	PhabricatorUser $viewer,
	$type) {

	$credential = $this->loadCredential($phid, $viewer);

	$this->validateCredential($credential, $type);

	$this->credential = $credential;

	return $this;
	}

	public function getUsernameEnvelope() {
	$credential = $this->requireCredential();
	return new PhutilOpaqueEnvelope($credential->getUsername());
	}

	}