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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());
			}

			}