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<?php
namespace Zotlabs\Lib;
/**
* Class for dealing with fetching ActivityStreams collections (ordered or unordered, normal or paged).
* Construct with either an existing object or url and an optional channel to sign requests.
* $direction is 0 (default) to fetch from the beginning, and 1 to fetch from the end and reverse order the resultant array.
* An optional limit to the number of records returned may also be specified.
* Use $class->get() to return an array of collection members.
*/
class ASCollection {
private $channel = null;
private $nextpage = null;
private $limit = 0;
private $direction = 0; // 0 = forward, 1 = reverse
private $data = [];
private $history = [];
function __construct($obj, $channel = null, $direction = 0, $limit = 0) {
$this->channel = $channel;
$this->direction = $direction;
$this->limit = $limit;
$data = null;
if (is_array($obj)) {
$data = $obj;
}
if (is_string($obj)) {
$data = Activity::fetch($obj, $channel);
$this->history[] = $obj;
}
if (!is_array($data)) {
return;
}
if (!in_array($data['type'], ['Collection', 'OrderedCollection', 'OrderedCollectionPage'])) {
return false;
}
if ($this->direction) {
if (array_key_exists('last', $data) && $data['last']) {
$this->nextpage = $data['last'];
}
}
else {
if (array_key_exists('first', $data) && $data['first']) {
$this->nextpage = $data['first'];
}
}
if (isset($data['items']) && is_array($data['items'])) {
$this->data = (($this->direction) ? array_reverse($data['items']) : $data['items']);
}
elseif (isset($data['orderedItems']) && is_array($data['orderedItems'])) {
$this->data = (($this->direction) ? array_reverse($data['orderedItems']) : $data['orderedItems']);
}
if ($this->limit) {
if (count($this->data) > $limit) {
$this->data = array_slice($this->data, 0, $limit);
return;
}
}
do {
$x = $this->next();
} while ($x);
}
function get() {
return $this->data;
}
function next() {
if (!$this->nextpage) {
return false;
}
if (is_array($this->nextpage)) {
$data = $this->nextpage;
}
if (is_string($this->nextpage)) {
if (in_array($this->nextpage, $this->history)) {
// recursion detected
return false;
}
$data = Activity::fetch($this->nextpage, $this->channel);
$this->history[] = $this->nextpage;
}
if (!is_array($data)) {
return false;
}
if (!in_array($data['type'], ['CollectionPage', 'OrderedCollectionPage'])) {
return false;
}
$this->setnext($data);
if (isset($data['items']) && is_array($data['items'])) {
$this->data = array_merge($this->data, (($this->direction) ? array_reverse($data['items']) : $data['items']));
}
elseif (isset($data['orderedItems']) && is_array($data['orderedItems'])) {
$this->data = array_merge($this->data, (($this->direction) ? array_reverse($data['orderedItems']) : $data['orderedItems']));
}
if ($this->limit) {
if (count($this->data) > $this->limit) {
$this->data = array_slice($this->data, 0, $this->limit);
$this->nextpage = false;
return true;
}
}
return true;
}
function setnext($data) {
if ($this->direction) {
if (array_key_exists('prev', $data) && $data['prev']) {
$this->nextpage = $data['prev'];
}
elseif (array_key_exists('first', $data) && $data['first']) {
$this->nextpage = $data['first'];
}
else {
$this->nextpage = false;
}
}
else {
if (array_key_exists('next', $data) && $data['next']) {
$this->nextpage = $data['next'];
}
elseif (array_key_exists('last', $data) && $data['last']) {
$this->nextpage = $data['last'];
}
else {
$this->nextpage = false;
}
}
logger('nextpage: ' . $this->nextpage, LOGGER_DEBUG);
}
}
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