From c26dede97f626b52b7bf8962ed55d1dbda86abe8 Mon Sep 17 00:00:00 2001
From: Hilmar R <u02@u29lx193>
Date: Sun, 28 Feb 2021 21:06:16 +0100
Subject: get dev

---
 Zotlabs/Lib/ASCollection.php | 150 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 150 insertions(+)
 create mode 100644 Zotlabs/Lib/ASCollection.php

(limited to 'Zotlabs/Lib/ASCollection.php')

diff --git a/Zotlabs/Lib/ASCollection.php b/Zotlabs/Lib/ASCollection.php
new file mode 100644
index 000000000..392dd5d4e
--- /dev/null
+++ b/Zotlabs/Lib/ASCollection.php
@@ -0,0 +1,150 @@
+<?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     = $limit;
+
+		if (is_array($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);
+	}
+}
\ No newline at end of file
-- 
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