DiffusionLowLevelCommitFieldsQuery.php
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	<?php

	final class DiffusionLowLevelCommitFieldsQuery
	extends DiffusionLowLevelQuery {

	private $ref;
	private $revisionMatchData = array(
	'usedURI' => null,
	'foundURI' => null,
	'validDomain' => null,
	'matchHashType' => null,
	'matchHashValue' => null,
	);

	public function withCommitRef(DiffusionCommitRef $ref) {
	$this->ref = $ref;
	return $this;
	}

	public function getRevisionMatchData() {
	return $this->revisionMatchData;
	}

	private function setRevisionMatchData($key, $value) {
	$this->revisionMatchData[$key] = $value;
	return $this;
	}

	protected function executeQuery() {
	$ref = $this->ref;
	$message = $ref->getMessage();
	$hashes = $ref->getHashes();

	$params = array(
	'corpus' => $message,
	'partial' => true,
	);

	$result = id(new ConduitCall('differential.parsecommitmessage', $params))
	->setUser(PhabricatorUser::getOmnipotentUser())
	->execute();
	$fields = $result['fields'];

	$revision_id = idx($fields, 'revisionID');
	if ($revision_id) {
	$this->setRevisionMatchData('usedURI', true);
	} else {
	$this->setRevisionMatchData('usedURI', false);
	}
	$revision_id_info = $result['revisionIDFieldInfo'];
	$this->setRevisionMatchData('foundURI', $revision_id_info['value']);
	$this->setRevisionMatchData(
	'validDomain',
	$revision_id_info['validDomain']);

	// If there is no "Differential Revision:" field in the message, try to
	// identify the revision by doing a hash lookup.

	if (!$revision_id && $hashes) {
	$hash_list = array();
	foreach ($hashes as $hash) {
	$hash_list[] = array($hash->getHashType(), $hash->getHashValue());
	}
	$revisions = id(new DifferentialRevisionQuery())
	->setViewer(PhabricatorUser::getOmnipotentUser())
	->needHashes(true)
	->withCommitHashes($hash_list)
	->execute();

	if ($revisions) {
	$revision = $this->pickBestRevision($revisions);

	$fields['revisionID'] = $revision->getID();
	$revision_hashes = $revision->getHashes();

	$revision_hashes = DiffusionCommitHash::convertArrayToObjects(
	$revision_hashes);
	$revision_hashes = mpull($revision_hashes, null, 'getHashType');

	// sort the hashes in the order the mighty
	// @{class:ArcanstDifferentialRevisionHash} does; probably unnecessary
	// but should future proof things nicely.
	$revision_hashes = array_select_keys(
	$revision_hashes,
	ArcanistDifferentialRevisionHash::getTypes());

	foreach ($hashes as $hash) {
	$revision_hash = idx($revision_hashes, $hash->getHashType());
	if (!$revision_hash) {
	continue;
	}
	if ($revision_hash->getHashValue() == $hash->getHashValue()) {
	$this->setRevisionMatchData(
	'matchHashType',
	$hash->getHashType());
	$this->setRevisionMatchData(
	'matchHashValue',
	$hash->getHashValue());
	break;
	}
	}
	}
	}

	return $fields;
	}


	/**
	* When querying for revisions by hash, more than one revision may be found.
	* This function identifies the "best" revision from such a set. Typically,
	* there is only one revision found. Otherwise, we try to pick an accepted
	* revision first, followed by an open revision, and otherwise we go with a
	* closed or abandoned revision as a last resort.
	*/
	private function pickBestRevision(array $revisions) {
	assert_instances_of($revisions, 'DifferentialRevision');

	// If we have more than one revision of a given status, choose the most
	// recently updated one.
	$revisions = msort($revisions, 'getDateModified');
	$revisions = array_reverse($revisions);

	// Try to find an accepted revision first.
	foreach ($revisions as $revision) {
	if ($revision->isAccepted()) {
	return $revision;
	}
	}

	// Try to find an open revision.
	foreach ($revisions as $revision) {
	if (!$revision->isClosed()) {
	return $revision;
	}
	}

	// Settle for whatever's left.
	return head($revisions);
	}

	}

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