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PhabricatorRateLimitRequestExceptionHandler.php
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			<?php

			final class PhabricatorRateLimitRequestExceptionHandler
			extends PhabricatorRequestExceptionHandler {

			public function getRequestExceptionHandlerPriority() {
			return 300000;
			}

			public function getRequestExceptionHandlerDescription() {
			return pht(
			'Handles action rate limiting exceptions which occur when a user '.
			'does something too frequently.');
			}

			public function canHandleRequestThrowable(
			AphrontRequest $request,
			$throwable) {

			if (!$this->isPhabricatorSite($request)) {
			return false;
			}

			return ($throwable instanceof PhabricatorSystemActionRateLimitException);
			}

			public function handleRequestThrowable(
			AphrontRequest $request,
			$throwable) {

			$viewer = $this->getViewer($request);

			return id(new AphrontDialogView())
			->setTitle(pht('Slow Down!'))
			->setUser($viewer)
			->setErrors(array(pht('You are being rate limited.')))
			->appendParagraph($throwable->getMessage())
			->appendParagraph($throwable->getRateExplanation())
			->addCancelButton('/', pht('Okaaaaaaaaaaaaaay...'));
			}

			}