ProjectsMap.php
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	<?php

	namespace Nasqueron\Notifications\Phabricator;

	use Cache;

	class ProjectsMap implements \IteratorAggregate, \ArrayAccess {

	///
	/// Private properties and constants

	/**
	* The maximum number of projects to fetch
	*/
	const LIMIT = 1000;

	/**
	* The projects as an array with phid as keys, project names as $value
	*
	* @var string[]
	*/
	private $map = [];

	/**
	* The Phabricator instance for this projects map
	*
	* @var map
	*/
	private $instance;

	///
	/// Constructor
	///

	/**
	* Initializes a new instance of ProjectsMap
	*
	* @param string $instance The Phabricator root URL without trailing slash
	*/
	public function __construct ($instance) {
	$this->instance = $instance;
	}

	///
	/// IteratorAggregate interface implementation
	///

	/**
	* Gets iterator
	*
	* @return Traversable
	*/
	public function getIterator ( ) {
	return new ArrayIterator($this->map);
	}

	///
	/// ArrayAccess interface implementation
	///

	/**
	* Determines whether an offset exists
	*
	* @param mixed $offset The offset
	*/
	public function offsetExists ($offset) {
	return array_key_exists($this->map[$offset]);
	}

	/**
	* Gets an offset
	*
	* @param mixed $offset The offset
	* @return mixed The value
	*/
	public function offsetGet ($offset) {
	return $this->map[$offset];
	}

	/**
	* Assigns a value to the specified offset
	*
	* @param mixed $offset The offset
	* @param mixed $value The value to assign
	*/
	public function offsetSet ($offset, $value) {
	$this->map[$offset] = $value;
	}

	/**
	* Unset an offset
	*
	* @param mixed $offset The offset
	*/
	public function offsetUnset ($offset) {
	unset($this->map[$offset]);
	}

	///
	/// Static constructors
	///

	/**
	* Gets a new ProjectsMap instance and queries Phabricator API to fill it.
	*
	* @param string $phabricatorURL The Phabricator URL (e.g. http://secure.phabricator.com)
	* @param string $apiToken The API token from .../settings/panel/apitokens/
	* @return ProjectsMap
	*/
	public static function fetch ($phabricatorURL, $apiToken) {
	$instance = new self($phabricatorURL);

	$api = new PhabricatorAPI($phabricatorURL, $apiToken);
	$reply = $api->call(
	'project.query',
	[ 'limit' => self::LIMIT ]
	);

	if (!$reply) {
	throw new \Exception("Empty reply calling project.query at $phabricatorURL API.");
	}

	if (!property_exists($reply, 'data')) {
	throw new \Exception("Invalid reply calling project.query at $phabricatorURL API.");
	}

	foreach ($reply->data as $phid => $projectInfo) {
	$instance[$phid] = $projectInfo->name;
	}

	return $instance;
	}

	///
	/// Cache
	///

	/**
	* Gets cache key
	*
	* @return string The cache key for the current projects map
	*/
	private function getCacheKey () {
	return class_basename(get_class($this)) . '-' . md5($this->instance);
	}

	public function isCached () {
	return Cache::has($this->getCacheKey());
	}

	public function save () {
	Cache::forever($this->getCacheKey(), $this->map);
	}

	public function load () {
	$this->map = Cache::get($this->getCacheKey());
	}

	///
	/// Output
	///

	/**
	* Returns the projects map as an array, each row ['PHID', 'project name']
	*
	* @return Array
	*/
	public function toArray () {
	$array = [];
	foreach ($this->map as $phid => $projectName) {
	$array[] = [$phid, $projectName];
	}
	return $array;
	}
	}

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