initial activitystreams2 parser

Zotlabs/Lib/ActivityStreams2.php

@@ -0,0 +1,86 @@
+<?php
+
+namespace Zotlabs\Lib;
+
+
+class ActivityStreams2 {
+
+	public $data;
+	public $valid = false;
+	public $id    = '';
+	public $type  = '';
+	public $actor = null;
+	public $obj   = null;
+	public $tgt   = null;
+
+	function __construct($string) {
+
+		$this->data = json_decode($string,true);
+		if($this->data) {
+			$this->valid = true;
+		}
+
+		if($this->is_valid()) {
+			$this->id    = $this->get_property_obj('id');
+			$this->type  = $this->get_primary_type();
+			$this->actor = $this->get_compound_property('actor');
+			$this->obj   = $this->get_compound_property('object');
+			$this->tgt   = $this->get_compound_property('target');
+		}
+	}
+
+	function is_valid() {
+		return $this->valid;
+	}
+
+	function get_property_obj($property,$base = '') {
+		if(! $base) {
+			$base = $this->data;
+		}
+		return $base[$property];
+	}
+
+	function fetch_property($url) {
+		$redirects = 0;
+		$x = z_fetch_url($url,true,$redirects,
+			['headers' => [ 'Accept' => 'application/ld+json; profile="https://www.w3.org/ns/activitystreams"']]);
+		if($x['success'])
+			return json_decode($x['body'],true);
+		return null;
+	}
+
+	function get_compound_property($property,$base = '') {
+		$x = $this->get_property_obj($property,$base);
+		if($this->is_url($x)) {
+			$x = $this->fetch_property($x); 	
+		}
+		return $x;
+	}
+
+	function is_url($url) {
+		if(($url) && (! is_array($url)) && (strpos($url,'http') === 0)) {
+			return true;
+		}
+		return false;
+	}
+
+	function get_primary_type($base = '') {
+		if(! $base)
+			$base = $this->data;
+		$x = $this->get_property_obj('type',$base);
+		if(is_array($x)) {
+			foreach($x as $y) {
+				if(strpos($y,':') === false) {
+					return $y;
+				}
+			}
+		}
+		return $x;
+	}
+
+	function debug() {
+		$x = var_export($this,true);
+		return $x;
+	}
+
+}