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DifferentialAsanaRepresentationField.php
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			<?php

			final class DifferentialAsanaRepresentationField
			extends DifferentialCustomField {

			public function getFieldKey() {
			return 'differential:asana-representation';
			}

			public function getFieldName() {
			return pht('In Asana');
			}

			public function canDisableField() {
			return false;
			}

			public function getFieldDescription() {
			return pht('Shows revision representation in Asana.');
			}

			public function shouldAppearInPropertyView() {
			return (bool)PhabricatorEnv::getEnvConfig('asana.workspace-id');
			}

			public function renderPropertyViewLabel() {
			return $this->getFieldName();
			}

			public function renderPropertyViewValue(array $handles) {
			$viewer = $this->getViewer();
			$src_phid = $this->getObject()->getPHID();
			$edge_type = PhabricatorObjectHasAsanaTaskEdgeType::EDGECONST;

			$query = id(new PhabricatorEdgeQuery())
			->withSourcePHIDs(array($src_phid))
			->withEdgeTypes(array($edge_type))
			->needEdgeData(true);

			$edges = $query->execute();
			if (!$edges) {
			return null;
			}

			$edge = head($edges[$src_phid][$edge_type]);

			if (!$edge) {
			return null;
			}

			if (!empty($edge['data']['gone'])) {
			return phutil_tag(
			'em',
			array(),
			pht('Asana Task Deleted'));
			}

			$ref = id(new DoorkeeperImportEngine())
			->setViewer($viewer)
			->withPHIDs(array($edge['dst']))
			->needLocalOnly(true)
			->executeOne();

			if (!$ref) {
			return null;
			}

			return id(new DoorkeeperTagView())
			->setExternalObject($ref->getExternalObject());
			}

			}