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PassphraseSSHKey.php
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			<?php

			final class PassphraseSSHKey extends PassphraseAbstractKey {

			private $keyFile;

			public static function loadFromPHID($phid, PhabricatorUser $viewer) {
			$key = new PassphraseSSHKey();
			return $key->loadAndValidateFromPHID(
			$phid,
			$viewer,
			PassphraseSSHPrivateKeyCredentialType::PROVIDES_TYPE);
			}

			public function getKeyfileEnvelope() {
			$credential = $this->requireCredential();

			$file_type = PassphraseSSHPrivateKeyFileCredentialType::CREDENTIAL_TYPE;
			if ($credential->getCredentialType() != $file_type) {
			// If the credential does not store a file, write the key text out to a
			// temporary file so we can pass it to `ssh`.
			if (!$this->keyFile) {
			$secret = $credential->getSecret();
			if (!$secret) {
			throw new Exception(
			pht(
			'Attempting to use a credential ("%s") but the credential '.
			'secret has been destroyed!',
			$credential->getMonogram()));
			}

			$temporary_file = new TempFile('passphrase-ssh-key');
			Filesystem::changePermissions($temporary_file, 0600);
			Filesystem::writeFile($temporary_file, $secret->openEnvelope());

			$this->keyFile = $temporary_file;
			}

			return new PhutilOpaqueEnvelope((string)$this->keyFile);
			}

			return $credential->getSecret();
			}

			}