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PassphraseCredentialPublicController.php
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			<?php

			final class PassphraseCredentialPublicController
			extends PassphraseController {

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

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

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

			if (!$type->hasPublicKey()) {
			throw new Exception(pht('Credential has no public key!'));
			}

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

			$public_key = $type->getPublicKey($viewer, $credential);

			$body = id(new PHUIFormLayoutView())
			->appendChild(
			id(new AphrontFormTextAreaControl())
			->setLabel(pht('Public Key'))
			->setReadOnly(true)
			->setValue($public_key));

			return $this->newDialog()
			->setWidth(AphrontDialogView::WIDTH_FORM)
			->setTitle(pht('Public Key (%s)', $credential->getMonogram()))
			->appendChild($body)
			->addCancelButton($view_uri, pht('Done'));

			}

			}