DifferentialRevisionOperationController.php
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	<?php

	final class DifferentialRevisionOperationController
	extends DifferentialController {

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

	$revision = id(new DifferentialRevisionQuery())
	->withIDs(array($id))
	->setViewer($viewer)
	->needActiveDiffs(true)
	->executeOne();
	if (!$revision) {
	return new Aphront404Response();
	}

	$detail_uri = "/D{$id}";

	$op = new DrydockLandRepositoryOperation();
	$barrier = $op->getBarrierToLanding($viewer, $revision);
	if ($barrier) {
	return $this->newDialog()
	->setTitle($barrier['title'])
	->appendParagraph($barrier['body'])
	->addCancelButton($detail_uri);
	}

	$diff = $revision->getActiveDiff();
	$repository = $revision->getRepository();

	$default_ref = $this->loadDefaultRef($repository, $diff);

	if ($default_ref) {
	$v_ref = array($default_ref->getPHID());
	} else {
	$v_ref = array();
	}

	$e_ref = true;

	$errors = array();
	if ($request->isFormPost()) {

	$v_ref = $request->getArr('refPHIDs');
	$ref_phid = head($v_ref);
	if (!strlen($ref_phid)) {
	$e_ref = pht('Required');
	$errors[] = pht(
	'You must select a branch to land this revision onto.');
	} else {
	$ref = $this->newRefQuery($repository)
	->withPHIDs(array($ref_phid))
	->executeOne();
	if (!$ref) {
	$e_ref = pht('Invalid');
	$errors[] = pht(
	'You must select a branch from this repository to land this '.
	'revision onto.');
	}
	}

	if (!$errors) {
	// NOTE: The operation is locked to the current active diff, so if the
	// revision is updated before the operation applies nothing sneaky
	// occurs.

	$target = 'branch:'.$ref->getRefName();

	$operation = DrydockRepositoryOperation::initializeNewOperation($op)
	->setAuthorPHID($viewer->getPHID())
	->setObjectPHID($revision->getPHID())
	->setRepositoryPHID($repository->getPHID())
	->setRepositoryTarget($target)
	->setProperty('differential.diffPHID', $diff->getPHID());

	$operation->save();
	$operation->scheduleUpdate();

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

	$ref_datasource = id(new DiffusionRefDatasource())
	->setParameters(
	array(
	'repositoryPHIDs' => array($repository->getPHID()),
	'refTypes' => $this->getTargetableRefTypes(),
	));

	$form = id(new AphrontFormView())
	->setUser($viewer)
	->appendRemarkupInstructions(
	pht(
	'(NOTE) This feature is new and experimental.'))
	->appendControl(
	id(new AphrontFormTokenizerControl())
	->setLabel(pht('Onto Branch'))
	->setName('refPHIDs')
	->setLimit(1)
	->setError($e_ref)
	->setValue($v_ref)
	->setDatasource($ref_datasource));

	return $this->newDialog()
	->setWidth(AphrontDialogView::WIDTH_FORM)
	->setTitle(pht('Land Revision'))
	->setErrors($errors)
	->appendForm($form)
	->addCancelButton($detail_uri)
	->addSubmitButton(pht('Land Revision'));
	}

	private function newRefQuery(PhabricatorRepository $repository) {
	$viewer = $this->getViewer();

	return id(new PhabricatorRepositoryRefCursorQuery())
	->setViewer($viewer)
	->withRepositoryPHIDs(array($repository->getPHID()))
	->withRefTypes($this->getTargetableRefTypes());
	}

	private function getTargetableRefTypes() {
	return array(
	PhabricatorRepositoryRefCursor::TYPE_BRANCH,
	);
	}

	private function loadDefaultRef(
	PhabricatorRepository $repository,
	DifferentialDiff $diff) {
	$default_name = $this->getDefaultRefName($repository, $diff);

	if (!strlen($default_name)) {
	return null;
	}

	return $this->newRefQuery($repository)
	->withRefNames(array($default_name))
	->executeOne();
	}

	private function getDefaultRefName(
	PhabricatorRepository $repository,
	DifferentialDiff $diff) {

	$onto = $diff->loadTargetBranch();
	if ($onto !== null) {
	return $onto;
	}

	return $repository->getDefaultBranch();
	}

	}

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