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FlagDeleteConduitAPIMethod.php
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			<?php

			final class FlagDeleteConduitAPIMethod extends FlagConduitAPIMethod {

			public function getAPIMethodName() {
			return 'flag.delete';
			}

			public function getMethodDescription() {
			return pht('Clear a flag.');
			}

			protected function defineParamTypes() {
			return array(
			'id' => 'optional id',
			'objectPHID' => 'optional phid',
			);
			}

			protected function defineReturnType() {
			return 'dict \| null';
			}

			protected function defineErrorTypes() {
			return array(
			'ERR_NOT_FOUND' => pht('Bad flag ID.'),
			'ERR_WRONG_USER' => pht('You are not the creator of this flag.'),
			'ERR_NEED_PARAM' => pht('Must pass an id or an objectPHID.'),
			);
			}

			protected function execute(ConduitAPIRequest $request) {
			$id = $request->getValue('id');
			$object = $request->getValue('objectPHID');
			if ($id) {
			$flag = id(new PhabricatorFlag())->load($id);
			if (!$flag) {
			throw new ConduitException('ERR_NOT_FOUND');
			}
			if ($flag->getOwnerPHID() != $request->getUser()->getPHID()) {
			throw new ConduitException('ERR_WRONG_USER');
			}
			} else if ($object) {
			$flag = id(new PhabricatorFlag())->loadOneWhere(
			'objectPHID = %s AND ownerPHID = %s',
			$object,
			$request->getUser()->getPHID());
			if (!$flag) {
			return null;
			}
			} else {
			throw new ConduitException('ERR_NEED_PARAM');
			}
			$this->attachHandleToFlag($flag, $request->getUser());
			$ret = $this->buildFlagInfoDictionary($flag);
			$flag->delete();
			return $ret;
			}

			}