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PassphraseCredentialDestroyController.php
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			<?php

			final class PassphraseCredentialDestroyController
			extends PassphraseController {

			public function handleRequest(AphrontRequest $request) {
			$viewer = $request->getViewer();
			$id = $request->getURIData('id');

			$credential = id(new PassphraseCredentialQuery())
			->setViewer($viewer)
			->withIDs(array($id))
			->requireCapabilities(
			array(
			PhabricatorPolicyCapability::CAN_VIEW,
			PhabricatorPolicyCapability::CAN_EDIT,
			))
			->executeOne();
			if (!$credential) {
			return new Aphront404Response();
			}

			$type = PassphraseCredentialType::getTypeByConstant(
			$credential->getCredentialType());
			if (!$type) {
			throw new Exception(pht('Credential has invalid type "%s"!', $type));
			}

			$view_uri = '/K'.$credential->getID();

			if ($request->isFormPost()) {

			$xactions = array();
			$xactions[] = id(new PassphraseCredentialTransaction())
			->setTransactionType(
			PassphraseCredentialDestroyTransaction::TRANSACTIONTYPE)
			->setNewValue(1);

			$editor = id(new PassphraseCredentialTransactionEditor())
			->setActor($viewer)
			->setContinueOnMissingFields(true)
			->setContentSourceFromRequest($request)
			->applyTransactions($credential, $xactions);

			return id(new AphrontRedirectResponse())->setURI($view_uri);
			}

			return $this->newDialog()
			->setUser($viewer)
			->setTitle(pht('Really destroy credential?'))
			->appendChild(
			pht(
			'This credential will be deactivated and the secret will be '.
			'unrecoverably destroyed. Anything relying on this credential '.
			'will cease to function. This operation can not be undone.'))
			->addSubmitButton(pht('Destroy Credential'))
			->addCancelButton($view_uri);
			}

			}