<?php

namespace ActivityPhp\Server\Actor;

use ActivityPhp\Server;
use ActivityPhp\Server\Activity\HandlerInterface;
use ActivityPhp\Server\Actor;
use ActivityPhp\Server\Helper;
use ActivityPhp\Server\Http\Request as HttpRequest;
use ActivityPhp\Type;
use ActivityPhp\Type\Core\AbstractActivity;
use ActivityPhp\Type\Util;
use Exception;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Response;

/**
 * A server-side outbox
 */
class Outbox extends AbstractBox
{
    /**
     * Outbox constructor
     *
     * @param  \ActivityPhp\Server\Actor $actor An actor
     * @param  \ActivityPhp\Server $server
     */
    public function __construct(Actor $actor, Server $server)
    {
        $server->logger()->info(
            $actor->get()->preferredUsername . ':' . __METHOD__
        );
        parent::__construct($actor, $server);
    }

    /**
     * Get items from an outbox
     *
     * @param  string $page
     * @return array
     */
    public function getPage(string $url)
    {
        $this->server->logger()->info(
            $this->actor->webfinger()->getHandle() . ':' . __METHOD__,
            [$url]
        );

        return Type::create(Helper::fetch($url));
    }

    /**
     * Fetch an outbox
     *
     * @return \ActivityPhp\Type\Core\OrderedCollection
     */
    public function get()
    {
        if (!is_null($this->orderedCollection)) {
            return $this->orderedCollection;
        }

        $this->server->logger()->info(
            $this->actor->webfinger()->getHandle() . ':' . __METHOD__
        );

        $url = $this->actor->get('outbox');

        if (is_null($url)) {
            $this->server->logger()->warning(
                $this->actor->webfinger()->getHandle()
                . ': Outbox is not defined'
            );
            return;
        }

        $this->orderedCollection = Type::create(
            Helper::fetch($url)
        );

        return $this->orderedCollection;
    }

    /**
     * Post a message to the world
     *
     * @param  \Symfony\Component\HttpFoundation\Request $request
     * @return \Symfony\Component\HttpFoundation\Response
     */
    public function post(Request $request)
    {
        try {
            // Check accept header
            Helper::validateAcceptHeader(
                $request->headers->get('accept'),
                true
            );

            // Check current actor can post


            // Get content
            $payload = Util::decodeJson(
                (string)$request->getContent()
            );

            // Cast as an ActivityStreams type
            $activity = Type::create($payload);

        } catch (Exception $exception) {
            $this->getServer()->logger()->error(
                $this->actor->get()->preferredUsername. ':' . __METHOD__, [
                    $exception->getMessage()
                ]
            );

            return new Response('', 400);
        }

        // Log
        $this->getServer()->logger()->debug(
            $this->actor->get()->preferredUsername. ':' . __METHOD__ . '(starting)',
            $activity->toArray()
        );

        // If it's not an activity, wrap into a Create activity
        if (!Util::subclassOf($activity, AbstractActivity::class)) {
            $activity = $this->wrapObject($activity);
        }

        // Clients submitting the following activities to an outbox MUST
        // provide the object property in the activity:
        //  Create, Update, Delete, Follow,
        //  Add, Remove, Like, Block, Undo
        if (!isset($activity->object)) {
            throw new Exception(
                "A posted activity must have an 'object' property"
            );
        }

        // Prepare an activity handler
        $handler = sprintf(
            '\ActivityPhp\Server\Activity\%sHandler',
            $activity->type
        );

        if (!class_exists($handler)) {
            throw new Exception(
                "No handler has been defined for this activity "
                . "'{$activity->type}'"
            );
        }

        // Handle activity
        $handler = new $handler($activity);

        if (!($handler instanceof HandlerInterface)) {
            throw new Exception(
                "An activity handler must implement "
                . HandlerInterface::class
            );
        }

        // Log
        $this->getServer()->logger()->debug(
            $this->actor->get()->preferredUsername. ':' . __METHOD__ . '(posted)',
            $activity->toArray()
        );

        // Return a standard HTTP Response
        return $handler->handle()->getResponse();
    }
}
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