1 files changed, 94 insertions, 0 deletions
diff --git a/Zotlabs/Lib/ActivityStreams.php b/Zotlabs/Lib/ActivityStreams.php
new file mode 100644
index 000000000..2b610c7a4
--- /dev/null
+++ b/Zotlabs/Lib/ActivityStreams.php
@@ -0,0 +1,94 @@
+<?php
+
+namespace Zotlabs\Lib;
+
+class ActivityStreams {
+
+	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');
+			$this->origin = $this->get_compound_property('origin');
+
+			if(($this->type === 'Note') && (! $this->obj)) {
+				$this->obj = $this->data;
+				$this->type = 'Create';
+			}
+		}
+	}
+
+	function is_valid() {
+		return $this->valid;
+	}
+
+	function get_property_obj($property,$base = '') {
+		$base = (($base) ? $base : $this->data);
+		return ((array_key_exists($property,$base)) ? $base[$property] : null);
+	}
+
+	function fetch_property($url) {
+		$redirects = 0;
+		if(! check_siteallowed($url)) {
+			logger('blacklisted: ' . $url);
+			return null;
+		}
+
+		$x = z_fetch_url($url,true,$redirects,
+			['headers' => [ 'Accept: application/activity+json, application/ld+json; profile="https://www.w3.org/ns/activitystreams"']]);
+		if($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;
+	}
+
+}
+\ No newline at end of file