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DifferentialGetRawDiffConduitAPIMethod.php
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			<?php

			final class DifferentialGetRawDiffConduitAPIMethod
			extends DifferentialConduitAPIMethod {

			public function getAPIMethodName() {
			return 'differential.getrawdiff';
			}

			public function getMethodDescription() {
			return pht('Retrieve a raw diff');
			}

			protected function defineParamTypes() {
			return array(
			'diffID' => 'required diffID',
			);
			}

			protected function defineReturnType() {
			return 'nonempty string';
			}

			protected function defineErrorTypes() {
			return array(
			'ERR_NOT_FOUND' => pht('Diff not found.'),
			);
			}

			protected function execute(ConduitAPIRequest $request) {
			$diff_id = $request->getValue('diffID');

			$viewer = $request->getUser();

			$diff = id(new DifferentialDiffQuery())
			->withIDs(array($diff_id))
			->setViewer($viewer)
			->needChangesets(true)
			->executeOne();

			if (!$diff) {
			throw new ConduitException('ERR_NOT_FOUND');
			}

			$renderer = id(new DifferentialRawDiffRenderer())
			->setChangesets($diff->getChangesets())
			->setViewer($viewer)
			->setFormat('git');

			return $renderer->buildPatch();
			}

			}