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PhabricatorMacroFileTransaction.php
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			<?php

			final class PhabricatorMacroFileTransaction
			extends PhabricatorMacroTransactionType {

			const TRANSACTIONTYPE = 'macro:file';

			public function generateOldValue($object) {
			return $object->getFilePHID();
			}

			public function applyInternalEffects($object, $value) {
			$object->setFilePHID($value);
			}

			public function extractFilePHIDs($object, $value) {
			return array($value);
			}

			public function getTitle() {
			return pht(
			'%s changed the image for this macro.',
			$this->renderAuthor());
			}

			public function getTitleForFeed() {
			return pht(
			'%s changed the image for %s.',
			$this->renderAuthor(),
			$this->renderObject());
			}

			public function validateTransactions($object, array $xactions) {
			$errors = array();
			$viewer = $this->getActor();

			$old_phid = $object->getFilePHID();

			foreach ($xactions as $xaction) {
			$file_phid = $xaction->getNewValue();

			if (!$old_phid) {
			if ($this->isEmptyTextTransaction($file_phid, $xactions)) {
			$errors[] = $this->newRequiredError(
			pht('Image macros must have a file.'));
			return $errors;
			}
			}

			// Only validate if file was uploaded
			if ($file_phid) {
			$file = id(new PhabricatorFileQuery())
			->setViewer($viewer)
			->withPHIDs(array($file_phid))
			->executeOne();

			if (!$file) {
			$errors[] = $this->newInvalidError(
			pht('"%s" is not a valid file PHID.',
			$file_phid));
			} else {
			if (!$file->isViewableImage()) {
			$mime_type = $file->getMimeType();
			$errors[] = $this->newInvalidError(
			pht('File mime type of "%s" is not a valid viewable image.',
			$mime_type));
			}
			}
			}

			}

			return $errors;
			}

			public function getIcon() {
			return 'fa-file-image-o';
			}

			}