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<?php
namespace Zotlabs\Lib;
class ActivityStreams {
public $data;
public $valid = false;
public $id = '';
public $type = '';
public $actor = null;
public $obj = null;
public $tgt = null;
public $origin = null;
public $owner = null;
function __construct($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');
$this->owner = $this->get_compound_property('owner','','http://purl.org/zot/protocol');
if(($this->type === 'Note') && (! $this->obj)) {
$this->obj = $this->data;
$this->type = 'Create';
}
}
}
function is_valid() {
return $this->valid;
}
function get_namespace($base,$namespace) {
$key = null;
foreach( [ $this->data, $base ] as $b ) {
if(! $b)
continue;
if(array_key_exists('@context',$b)) {
if(is_array($b['@context'])) {
foreach($b['@context'] as $ns) {
if(is_array($ns)) {
foreach($ns as $k => $v) {
if($namespace === $v)
$key = $k;
}
}
else {
if($namespace === $ns) {
$key = '';
}
}
}
}
else {
if($namespace === $b['@context']) {
$key = '';
}
}
}
}
return $key;
}
function get_property_obj($property,$base = '',$namespace = 'https://www.w3.org/ns/activitystreams') {
$prefix = $this->get_namespace($base,$namespace);
if($prefix === null)
return null;
$base = (($base) ? $base : $this->data);
$propname = (($prefix) ? $prefix . ':' : '') . $property;
return ((array_key_exists($propname,$base)) ? $base[$propname] : 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,$base = '',$namespace = 'https://www.w3.org/ns/activitystreams') {
$x = $this->get_property_obj($property,$base,$namespace);
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 = '',$namespace = 'https://www.w3.org/ns/activitystreams') {
if(! $base)
$base = $this->data;
$x = $this->get_property_obj('type',$base,$namespace);
if(is_array($x)) {
foreach($x as $y) {
if(strpos($y,':') === false) {
return $y;
}
}
}
return $x;
}
function debug() {
$x = var_export($this,true);
return $x;
}
}
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