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DiffusionInternalAncestorsConduitAPIMethod.php
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			<?php

			final class DiffusionInternalAncestorsConduitAPIMethod
			extends DiffusionQueryConduitAPIMethod {

			public function isInternalAPI() {
			return true;
			}

			public function getAPIMethodName() {
			return 'diffusion.internal.ancestors';
			}

			public function getMethodDescription() {
			return pht('Internal method for filtering ref ancestors.');
			}

			protected function defineReturnType() {
			return 'list<string>';
			}

			protected function defineCustomParamTypes() {
			return array(
			'ref' => 'required string',
			'commits' => 'required list<string>',
			);
			}

			protected function getResult(ConduitAPIRequest $request) {
			$drequest = $this->getDiffusionRequest();
			$repository = $drequest->getRepository();

			$commits = $request->getValue('commits');
			$ref = $request->getValue('ref');

			$graph = new PhabricatorGitGraphStream($repository, $ref);

			$keep = array();
			foreach ($commits as $identifier) {
			try {
			$graph->getCommitDate($identifier);
			$keep[] = $identifier;
			} catch (Exception $ex) {
			// Not an ancestor.
			}
			}

			return $keep;
			}

			}