PhragmentSnapshotDeleteController.php
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	<?php

	final class PhragmentSnapshotDeleteController extends PhragmentController {

	private $id;

	public function willProcessRequest(array $data) {
	$this->id = $data['id'];
	}

	public function processRequest() {
	$request = $this->getRequest();
	$viewer = $request->getUser();

	$snapshot = id(new PhragmentSnapshotQuery())
	->setViewer($viewer)
	->requireCapabilities(array(
	PhabricatorPolicyCapability::CAN_VIEW,
	PhabricatorPolicyCapability::CAN_EDIT))
	->withIDs(array($this->id))
	->executeOne();
	if ($snapshot === null) {
	return new Aphront404Response();
	}

	if ($request->isDialogFormPost()) {
	$fragment_uri = $snapshot->getPrimaryFragment()->getURI();

	$snapshot->delete();

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

	return $this->createDialog();
	}

	function createDialog() {
	$request = $this->getRequest();
	$viewer = $request->getUser();

	$dialog = id(new AphrontDialogView())
	->setTitle(pht('Really delete this snapshot?'))
	->setUser($request->getUser())
	->addSubmitButton(pht('Delete'))
	->addCancelButton(pht('Cancel'))
	->appendParagraph(pht(
	'Deleting this snapshot is a permanent operation. You can not '.
	'recover the state of the snapshot.'));
	return id(new AphrontDialogResponse())->setDialog($dialog);
	}

	}