wordpress-activitypub/includes/activity/class-base-object.php
André Menrath 6c6d9076a8
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WIP: Rewrite of transformer management
2023-12-22 16:18:18 +01:00

818 lines
19 KiB
PHP

<?php
/**
* Inspired by the PHP ActivityPub Library by @Landrok
*
* @link https://github.com/landrok/activitypub
*/
namespace Activitypub\Activity;
use WP_Error;
use ReflectionClass;
use function Activitypub\camel_to_snake_case;
use function Activitypub\snake_to_camel_case;
/**
* Base_Object is an implementation of one of the
* Activity Streams Core Types.
*
* The Object is the primary base type for the Activity Streams
* vocabulary.
*
* Note: Object is a reserved keyword in PHP. It has been suffixed with
* 'Base_' for this reason.
*
* @see https://www.w3.org/TR/activitystreams-core/#object
*/
class Base_Object {
const CONTEXT_ACTIVITYSTREAMS = 'https://www.w3.org/ns/activitystreams';
const CONTEXT_SECURITY = 'https://w3id.org/security/v1';
/**
* The object's unique global identifier
*
* @see https://www.w3.org/TR/activitypub/#obj-id
*
* @var string
*/
protected $id;
/**
* @var string
*/
protected $type = 'Object';
/**
* A resource attached or related to an object that potentially
* requires special handling.
* The intent is to provide a model that is at least semantically
* similar to attachments in email.
*
* @see https://www.w3.org/TR/activitystreams-vocabulary/#dfn-attachment
*
* @var string
* | ObjectType
* | Link
* | array<ObjectType>
* | array<Link>
* | null
*/
protected $attachment;
/**
* One or more entities to which this object is attributed.
* The attributed entities might not be Actors. For instance, an
* object might be attributed to the completion of another activity.
*
* @see https://www.w3.org/TR/activitystreams-vocabulary/#dfn-attributedto
*
* @var string
* | ObjectType
* | Link
* | array<ObjectType>
* | array<Link>
* | null
*/
protected $attributed_to;
/**
* One or more entities that represent the total population of
* entities for which the object can considered to be relevant.
*
* @see https://www.w3.org/TR/activitystreams-vocabulary/#dfn-audience
*
* @var string
* | ObjectType
* | Link
* | array<ObjectType>
* | array<Link>
* | null
*/
protected $audience;
/**
* The content or textual representation of the Object encoded as a
* JSON string. By default, the value of content is HTML.
* The mediaType property can be used in the object to indicate a
* different content type.
*
* The content MAY be expressed using multiple language-tagged
* values.
*
* @see https://www.w3.org/TR/activitystreams-vocabulary/#dfn-content
*
* @var string|null
*/
protected $content;
/**
* The context within which the object exists or an activity was
* performed.
* The notion of "context" used is intentionally vague.
* The intended function is to serve as a means of grouping objects
* and activities that share a common originating context or
* purpose. An example could be all activities relating to a common
* project or event.
*
* @see https://www.w3.org/TR/activitystreams-vocabulary/#dfn-context
*
* @var string
* | ObjectType
* | Link
* | null
*/
protected $context;
/**
* The content MAY be expressed using multiple language-tagged
* values.
*
* @see https://www.w3.org/TR/activitystreams-vocabulary/#dfn-content
*
* @var array|null
*/
protected $content_map;
/**
* A simple, human-readable, plain-text name for the object.
* HTML markup MUST NOT be included.
*
* @see https://www.w3.org/TR/activitystreams-vocabulary/#dfn-name
*
* @var string|null xsd:string
*/
protected $name;
/**
* The name MAY be expressed using multiple language-tagged values.
*
* @see https://www.w3.org/TR/activitystreams-vocabulary/#dfn-name
*
* @var array|null rdf:langString
*/
protected $name_map;
/**
* The date and time describing the actual or expected ending time
* of the object.
* When used with an Activity object, for instance, the endTime
* property specifies the moment the activity concluded or
* is expected to conclude.
*
* @see https://www.w3.org/TR/activitystreams-vocabulary/#dfn-endtime
*
* @var string|null
*/
protected $end_time;
/**
* The entity (e.g. an application) that generated the object.
*
* @var string|null
*/
protected $generator;
/**
* An entity that describes an icon for this object.
* The image should have an aspect ratio of one (horizontal)
* to one (vertical) and should be suitable for presentation
* at a small size.
*
* @see https://www.w3.org/TR/activitystreams-vocabulary/#dfn-icon
*
* @var string
* | Image
* | Link
* | array<Image>
* | array<Link>
* | null
*/
protected $icon;
/**
* An entity that describes an image for this object.
* Unlike the icon property, there are no aspect ratio
* or display size limitations assumed.
*
* @see https://www.w3.org/TR/activitystreams-vocabulary/#dfn-image-term
*
* @var string
* | Image
* | Link
* | array<Image>
* | array<Link>
* | null
*/
protected $image;
/**
* One or more entities for which this object is considered a
* response.
*
* @see https://www.w3.org/TR/activitystreams-vocabulary/#dfn-inreplyto
*
* @var string
* | ObjectType
* | Link
* | array<ObjectType>
* | array<Link>
* | null
*/
protected $in_reply_to;
/**
* One or more physical or logical locations associated with the
* object.
*
* @see https://www.w3.org/TR/activitystreams-vocabulary/#dfn-location
*
* @var string
* | ObjectType
* | Link
* | array<ObjectType>
* | array<Link>
* | null
*/
protected $location;
/**
* An entity that provides a preview of this object.
*
* @see https://www.w3.org/TR/activitystreams-vocabulary/#dfn-preview
*
* @var string
* | ObjectType
* | Link
* | null
*/
protected $preview;
/**
* The date and time at which the object was published
*
* @see https://www.w3.org/TR/activitystreams-vocabulary/#dfn-published
*
* @var string|null xsd:dateTime
*/
protected $published;
/**
* The date and time describing the actual or expected starting time
* of the object.
* When used with an Activity object, for instance, the startTime
* property specifies the moment the activity began
* or is scheduled to begin.
*
* @see https://www.w3.org/TR/activitystreams-vocabulary/#dfn-starttime
*
* @var string|null xsd:dateTime
*/
protected $start_time;
/**
* A natural language summarization of the object encoded as HTML.
* Multiple language tagged summaries MAY be provided.
*
* @see https://www.w3.org/TR/activitystreams-vocabulary/#dfn-summary
*
* @var string
* | ObjectType
* | Link
* | null
*/
protected $summary;
/**
* The content MAY be expressed using multiple language-tagged
* values.
*
* @see https://www.w3.org/TR/activitystreams-vocabulary/#dfn-summary
*
* @var array<string>|null
*/
protected $summary_map;
/**
* One or more "tags" that have been associated with an objects.
* A tag can be any kind of Object.
* The key difference between attachment and tag is that the former
* implies association by inclusion, while the latter implies
* associated by reference.
*
* @see https://www.w3.org/TR/activitystreams-vocabulary/#dfn-tag
*
* @var string
* | ObjectType
* | Link
* | array<ObjectType>
* | array<Link>
* | null
*/
protected $tag;
/**
* The date and time at which the object was updated
*
* @see https://www.w3.org/TR/activitystreams-vocabulary/#dfn-updated
*
* @var string|null xsd:dateTime
*/
protected $updated;
/**
* One or more links to representations of the object.
*
* @var string
* | array<string>
* | Link
* | array<Link>
* | null
*/
protected $url;
/**
* An entity considered to be part of the public primary audience
* of an Object
*
* @see https://www.w3.org/TR/activitystreams-vocabulary/#dfn-to
*
* @var string
* | ObjectType
* | Link
* | array<ObjectType>
* | array<Link>
* | null
*/
protected $to;
/**
* An Object that is part of the private primary audience of this
* Object.
*
* @see https://www.w3.org/TR/activitystreams-vocabulary/#dfn-bto
*
* @var string
* | ObjectType
* | Link
* | array<ObjectType>
* | array<Link>
* | null
*/
protected $bto;
/**
* An Object that is part of the public secondary audience of this
* Object.
*
* @see https://www.w3.org/TR/activitystreams-vocabulary/#dfn-cc
*
* @var string
* | ObjectType
* | Link
* | array<ObjectType>
* | array<Link>
* | null
*/
protected $cc;
/**
* One or more Objects that are part of the private secondary
* audience of this Object.
*
* @see https://www.w3.org/TR/activitystreams-vocabulary/#dfn-bcc
*
* @var string
* | ObjectType
* | Link
* | array<ObjectType>
* | array<Link>
* | null
*/
protected $bcc;
/**
* The MIME media type of the value of the content property.
* If not specified, the content property is assumed to contain
* text/html content.
*
* @see https://www.w3.org/TR/activitystreams-vocabulary/#dfn-mediatype
*
* @var string|null
*/
protected $media_type;
/**
* When the object describes a time-bound resource, such as an audio
* or video, a meeting, etc, the duration property indicates the
* object's approximate duration.
* The value MUST be expressed as an xsd:duration as defined by
* xmlschema11-2, section 3.3.6 (e.g. a period of 5 seconds is
* represented as "PT5S").
*
* @see https://www.w3.org/TR/activitystreams-vocabulary/#dfn-duration
*
* @var string|null
*/
protected $duration;
/**
* Intended to convey some sort of source from which the content
* markup was derived, as a form of provenance, or to support
* future editing by clients.
*
* @see https://www.w3.org/TR/activitypub/#source-property
*
* @var ObjectType
*/
protected $source;
/**
* A Collection containing objects considered to be responses to
* this object.
*
* @see https://www.w3.org/TR/activitystreams-vocabulary/#dfn-replies
*
* @var string
* | Collection
* | Link
* | null
*/
protected $replies;
/**
* Magic function to implement getter and setter
*
* @param string $method The method name.
* @param string $params The method params.
*
* @return void
*/
public function __call( $method, $params ) {
$var = \strtolower( \substr( $method, 4 ) );
if ( \strncasecmp( $method, 'get', 3 ) === 0 ) {
if ( ! $this->has( $var ) ) {
return new WP_Error( 'invalid_key', __( 'Invalid key', 'activitypub' ), array( 'status' => 404 ) );
}
return $this->$var;
}
if ( \strncasecmp( $method, 'set', 3 ) === 0 ) {
return $this->set( $var, $params[0] );
}
if ( \strncasecmp( $method, 'add', 3 ) === 0 ) {
$this->add( $var, $params[0] );
}
}
/**
* The ActivityPub object typicallly can define it's own JSON-LD context.
*/
public function __construct() {
$this->context = $this->get_context();
}
/**
* Magic function, to transform the object to string.
*
* @return string The object id.
*/
public function __toString() {
return $this->to_string();
}
/**
* Function to transform the object to string.
*
* @return string The object id.
*/
public function to_string() {
return $this->get_id();
}
/**
* Generic getter.
*
* @param string $key The key to get.
*
* @return mixed The value.
*/
public function get( $key ) {
if ( ! $this->has( $key ) ) {
return new WP_Error( 'invalid_key', __( 'Invalid key', 'activitypub' ), array( 'status' => 404 ) );
}
return call_user_func( array( $this, 'get_' . $key ) );
}
/**
* Check if the object has a key
*
* @param string $key The key to check.
*
* @return boolean True if the object has the key.
*/
public function has( $key ) {
if ( $key === 'actor ') {
$key = 'actor';
}
return property_exists( $this, $key );
}
/**
* Generic setter.
*
* @param string $key The key to set.
* @param string $value The value to set.
*
* @return mixed The value.
*/
public function set( $key, $value ) {
if ( ! $this->has( $key ) ) {
if ( $key === 'actor' ) {
$key = 'actor';
}
return new WP_Error( 'invalid_key', __( 'Invalid key', 'activitypub' ), array( 'status' => 404 ) );
}
$this->$key = $value;
return $this;
}
/**
* Generic adder.
*
* @param string $key The key to set.
* @param mixed $value The value to add.
*
* @return mixed The value.
*/
public function add( $key, $value ) {
if ( ! $this->has( $key ) ) {
return new WP_Error( 'invalid_key', __( 'Invalid key', 'activitypub' ), array( 'status' => 404 ) );
}
if ( ! isset( $this->$key ) ) {
$this->$key = array();
}
$attributes = $this->$key;
$attributes[] = $value;
$this->$key = $attributes;
return $this->$key;
}
/**
* Convert JSON input to an array.
*
* @return string The JSON string.
*
* @return \Activitypub\Activity\Base_Object An Object built from the JSON string.
*/
public static function init_from_json( $json ) {
$array = \json_decode( $json, true );
if ( ! is_array( $array ) ) {
$array = array();
}
return self::init_from_array( $array );
}
/**
* Convert JSON input to an array.
*
* @return string The object array.
*
* @return \Activitypub\Activity\Base_Object An Object built from the JSON string.
*/
public static function init_from_array( $array ) {
if ( ! is_array( $array ) ) {
return new WP_Error( 'invalid_array', __( 'Invalid array', 'activitypub' ), array( 'status' => 404 ) );
}
$object = new static();
foreach ( $array as $key => $value ) {
$key = camel_to_snake_case( $key );
call_user_func( array( $object, 'set_' . $key ), $value );
}
return $object;
}
/**
* Convert JSON input to an array and pre-fill the object.
*
* @param string $json The JSON string.
*/
public function from_json( $json ) {
$array = \json_decode( $json, true );
$this->from_array( $array );
}
/**
* Convert JSON input to an array and pre-fill the object.
*
* @param array $array The array.
*/
public function from_array( $array ) {
foreach ( $array as $key => $value ) {
if ( $value ) {
$key = camel_to_snake_case( $key );
call_user_func( array( $this, 'set_' . $key ), $value );
}
}
}
/**
* Convert Object to an array.
*
* It tries to get the object attributes if they exist
* and falls back to the getters. Empty values are ignored.
*
* @return array An array built from the Object.
*/
public function to_array() {
$array = array();
$vars = get_object_vars( $this );
foreach ( $vars as $key => $value ) {
// ignotre all _prefixed keys.
if ( '_' === substr( $key, 0, 1 ) ) {
continue;
}
// if value is empty, try to get it from a getter.
if ( ! $value ) {
$value = call_user_func( array( $this, 'get_' . $key ) );
}
if ( is_object( $value ) ) {
$value = $value->to_array();
}
// if value is still empty, ignore it for the array and continue.
if ( isset( $value ) ) {
$array[ snake_to_camel_case( $key ) ] = $value;
}
}
// replace 'context' key with '@context' and move it to the top.
if ( array_key_exists( 'context', $array ) ) {
$context = $array['context'];
unset( $array['context'] );
$array = array_merge( array( '@context' => $context ), $array );
}
$class = new ReflectionClass( $this );
$class = strtolower( $class->getShortName() );
$array = \apply_filters( 'activitypub_activity_object_array', $array, $class, $this->id, $this );
$array = \apply_filters( "activitypub_activity_{$class}_object_array", $array, $this->id, $this );
return $array;
}
/**
* Convert Object to JSON.
*
* @return string The JSON string.
*/
public function to_json() {
$array = $this->to_array();
$options = \JSON_HEX_TAG | \JSON_HEX_AMP | \JSON_HEX_QUOT;
/*
* Options to be passed to json_encode()
*
* @param int $options The current options flags
*/
$options = \apply_filters( 'activitypub_json_encode_options', $options );
return \wp_json_encode( $array, $options );
}
/**
* Returns the keys of the object vars.
*
* @return array The keys of the object vars.
*/
public function get_object_var_keys() {
return \array_keys( \get_object_vars( $this ) );
}
/**
* Get the context information for a property.
*
* @param string $property
*
* @return array|null
*/
private function get_property_context( string $property ) {
$reflection_class = new \ReflectionClass( $this );
if ( $reflection_class->hasProperty( $property ) ) {
$reflection_property = $reflection_class->getProperty( $property );
$doc_omment = $reflection_property->getDocComment();
// Extract context information from the doc comment.
preg_match( '/@context\s+([^\s]+)/', $doc_omment, $matches );
if ( ! empty( $matches[1] ) ) {
return $matches[1];
} else {
return self::CONTEXT_ACTIVITYSTREAMS;
}
}
return null;
}
/**
* Compact the context via the JSON-LD syntax.
*
* @param array $key_context A certain part of the whole context.
* @param array $array The full URIs of the contexts.
* @param array $abbreviation The short name of the context.
*
* @return array $key_kontext The compacted context.
*/
private static function compact_context( $key_context, $namespace, $abbreviation ) {
$abbreviation_added = false;
foreach ( $key_context as $key => $value ) {
// Check if the key starts with the namespace
if ( strpos( $value, $namespace ) === 0 ) {
// Replace the key
$key_context[ $key ] = $abbreviation . ':' . substr( $value, strlen( $namespace ) );
// Add abbreviation element for the namespace only once
if ( ! $abbreviation_added ) {
$key_context = array( $abbreviation => $namespace ) + $key_context;
$abbreviation_added = true;
}
}
}
return $key_context;
}
/**
* Builds the context of the ActivityPub object via the PHP docs.
*
* @return array $context A shortened and clean JSON-LD context for the ActivityPub object.
*/
public static function get_context() {
$class = static::class;
// Try to lookup the context from a transient.
$transient = "activitypub_json_context_object_{$class}";
$context = get_transient( $transient );
if ( $context ) {
return $context;
}
$reflection_class = new \ReflectionClass( static::class );
$context = array(
self::CONTEXT_ACTIVITYSTREAMS,
self::CONTEXT_SECURITY,
);
$key_context = array();
foreach ( $reflection_class->getProperties() as $property ) {
$doc_omment = $property->getDocComment();
// Extract context information from the doc comment.
preg_match( '/@context\s+([^\s]+)/', $doc_omment, $matches );
if ( ! empty( $matches[1] ) ) {
$key_context[ snake_to_camel_case( $property->name ) ] = $matches[1];
}
}
$namespace_abbreviations = array(
'https://joinpeertube.org/ns#' => 'pt',
'https://joinmobilizon.org/ns#' => 'mz',
'https://schema.org/' => 'sc',
'https://www.w3.org/2002/12/cal/ical#' => 'ical',
);
foreach ( $namespace_abbreviations as $namespace => $abbreviation ) {
$key_context = self::compact_context( $key_context, $namespace, $abbreviation );
}
if ( ! empty( $key_context ) ) {
$context[] = $key_context;
}
set_transient( $transient, $context );
return $context;
}
}