friendica/mod/item.php

<?php
/**
 * @copyright Copyright (C) 2010-2022, the Friendica project
 *
 * @license GNU AGPL version 3 or any later version
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 *
 * This is the POST destination for most all locally posted
 * text stuff. This function handles status, wall-to-wall status,
 * local comments, and remote coments that are posted on this site
 * (as opposed to being delivered in a feed).
 * Also processed here are posts and comments coming through the
 * statusnet/twitter API.
 *
 * All of these become an "item" which is our basic unit of
 * information.
 */

use Friendica\App;
use Friendica\Content\PageInfo;
use Friendica\Content\Text\BBCode;
use Friendica\Core\Hook;
use Friendica\Core\Logger;
use Friendica\Core\Protocol;
use Friendica\Core\System;
use Friendica\Core\Worker;
use Friendica\Database\DBA;
use Friendica\DI;
use Friendica\Model\Attach;
use Friendica\Model\Contact;
use Friendica\Model\Conversation;
use Friendica\Model\FileTag;
use Friendica\Model\Item;
use Friendica\Model\ItemURI;
use Friendica\Model\Notification;
use Friendica\Model\Photo;
use Friendica\Model\Post;
use Friendica\Model\Tag;
use Friendica\Model\User;
use Friendica\Network\HTTPException;
use Friendica\Object\EMail\ItemCCEMail;
use Friendica\Protocol\Activity;
use Friendica\Security\Security;
use Friendica\Util\DateTimeFormat;
use Friendica\Util\ParseUrl;

function item_post(App $a) {
	if (!DI::userSession()->isAuthenticated()) {
		throw new HTTPException\ForbiddenException();
	}

	$uid = DI::userSession()->getLocalUserId();

	if (!empty($_REQUEST['dropitems'])) {
		$arr_drop = explode(',', $_REQUEST['dropitems']);
		foreach ($arr_drop as $item) {
			Item::deleteForUser(['id' => $item], $uid);
		}

		$json = ['success' => 1];
		System::jsonExit($json);
	}

	Hook::callAll('post_local_start', $_REQUEST);

	Logger::debug('postvars', ['_REQUEST' => $_REQUEST]);

	$api_source = $_REQUEST['api_source'] ?? false;

	$return_path = $_REQUEST['return'] ?? '';
	$preview = intval($_REQUEST['preview'] ?? 0);

	/*
	 * Check for doubly-submitted posts, and reject duplicates
	 * Note that we have to ignore previews, otherwise nothing will post
	 * after it's been previewed
	 */
	if (!$preview && !empty($_REQUEST['post_id_random'])) {
		if (!empty($_SESSION['post-random']) && $_SESSION['post-random'] == $_REQUEST['post_id_random']) {
			Logger::warning('duplicate post');
			item_post_return(DI::baseUrl(), $api_source, $return_path);
		} else {
			$_SESSION['post-random'] = $_REQUEST['post_id_random'];
		}
	}

	// Is this a reply to something?
	$parent_item_id = intval($_REQUEST['parent'] ?? 0);
	$thr_parent_uri = trim($_REQUEST['parent_uri'] ?? '');

	$parent_item = null;
	$toplevel_item = null;
	$toplevel_item_id = 0;
	$toplevel_user_id = null;

	$objecttype = null;
	$profile_uid = ($_REQUEST['profile_uid'] ?? 0) ?: DI::userSession()->getLocalUserId();
	$posttype = ($_REQUEST['post_type'] ?? '') ?: Item::PT_ARTICLE;

	if ($parent_item_id || $thr_parent_uri) {
		if ($parent_item_id) {
			$parent_item = Post::selectFirst(Item::ITEM_FIELDLIST, ['id' => $parent_item_id]);
		} elseif ($thr_parent_uri) {
			$parent_item = Post::selectFirst(Item::ITEM_FIELDLIST, ['uri' => $thr_parent_uri, 'uid' => $profile_uid]);
		}

		// if this isn't the top-level parent of the conversation, find it
		if (DBA::isResult($parent_item)) {
			// The URI and the contact is taken from the direct parent which needn't to be the top parent
			$thr_parent_uri = $parent_item['uri'];
			$toplevel_item = $parent_item;

			if ($parent_item['gravity'] != Item::GRAVITY_PARENT) {
				$toplevel_item = Post::selectFirst(Item::ITEM_FIELDLIST, ['id' => $toplevel_item['parent']]);
			}
		}

		if (!DBA::isResult($toplevel_item)) {
			DI::sysmsg()->addNotice(DI::l10n()->t('Unable to locate original post.'));
			if ($return_path) {
				DI::baseUrl()->redirect($return_path);
			}
			throw new HTTPException\NotFoundException(DI::l10n()->t('Unable to locate original post.'));
		}

		// When commenting on a public post then store the post for the current user
		// This enables interaction like starring and saving into folders
		if ($toplevel_item['uid'] == 0) {
			$stored = Item::storeForUserByUriId($toplevel_item['uri-id'], DI::userSession()->getLocalUserId(), ['post-reason' => Item::PR_ACTIVITY]);
			Logger::info('Public item stored for user', ['uri-id' => $toplevel_item['uri-id'], 'uid' => $uid, 'stored' => $stored]);
			if ($stored) {
				$toplevel_item = Post::selectFirst(Item::ITEM_FIELDLIST, ['id' => $stored]);
			}
		}

		$toplevel_item_id = $toplevel_item['id'];
		$toplevel_user_id = $toplevel_item['uid'];

		$objecttype = Activity\ObjectType::COMMENT;
	}

	if ($toplevel_item_id) {
		Logger::info('mod_item: item_post', ['parent' => $toplevel_item_id]);
	}

	$post_id     = intval($_REQUEST['post_id'] ?? 0);
	$app         = strip_tags($_REQUEST['source'] ?? '');
	$extid       = strip_tags($_REQUEST['extid'] ?? '');
	$object      = $_REQUEST['object'] ?? '';

	// Don't use "defaults" here. It would turn 0 to 1
	if (!isset($_REQUEST['wall'])) {
		$wall = 1;
	} else {
		$wall = $_REQUEST['wall'];
	}

	// Ensure that the user id in a thread always stay the same
	if (!is_null($toplevel_user_id) && in_array($toplevel_user_id, [DI::userSession()->getLocalUserId(), 0])) {
		$profile_uid = $toplevel_user_id;
	}

	// Allow commenting if it is an answer to a public post
	$allow_comment = DI::userSession()->getLocalUserId() && $toplevel_item_id && in_array($toplevel_item['private'], [Item::PUBLIC, Item::UNLISTED]) && in_array($toplevel_item['network'], Protocol::FEDERATED);

	// Now check that valid personal details have been provided
	if (!Security::canWriteToUserWall($profile_uid) && !$allow_comment) {
		Logger::warning('Permission denied.', ['local' => DI::userSession()->getLocalUserId(), 'profile_uid' => $profile_uid, 'toplevel_item_id' => $toplevel_item_id, 'network' => $toplevel_item['network']]);
		DI::sysmsg()->addNotice(DI::l10n()->t('Permission denied.'));
		if ($return_path) {
			DI::baseUrl()->redirect($return_path);
		}

		throw new HTTPException\ForbiddenException(DI::l10n()->t('Permission denied.'));
	}

	// Init post instance
	$orig_post = null;

	// is this an edited post?
	if ($post_id > 0) {
		$orig_post = Post::selectFirst(Item::ITEM_FIELDLIST, ['id' => $post_id]);
	}

	$user = User::getById($profile_uid, ['allow_cid', 'allow_gid', 'deny_cid', 'deny_gid']);
	if (!DBA::isResult($user) && !$toplevel_item_id) {
		return 0;
	}

	$categories = '';
	$postopts = '';
	$emailcc = '';
	$body = $_REQUEST['body'] ?? '';
	$has_attachment = $_REQUEST['has_attachment'] ?? 0;

	// If we have a speparate attachment, we need to add it to the body.
	if (!empty($has_attachment)) {
		$attachment_type  = $_REQUEST['attachment_type'] ??  '';
		$attachment_title = $_REQUEST['attachment_title'] ?? '';
		$attachment_text  = $_REQUEST['attachment_text'] ??  '';

		$attachment_url     = hex2bin($_REQUEST['attachment_url'] ??     '');
		$attachment_img_src = hex2bin($_REQUEST['attachment_img_src'] ?? '');

		$attachment_img_width  = $_REQUEST['attachment_img_width'] ??  0;
		$attachment_img_height = $_REQUEST['attachment_img_height'] ?? 0;

		// Fetch the basic attachment data
		$attachment = ParseUrl::getSiteinfoCached($attachment_url);
		unset($attachment['keywords']);

		// Overwrite the basic data with possible changes from the frontend
		$attachment['type'] = $attachment_type;
		$attachment['title'] = $attachment_title;
		$attachment['text'] = $attachment_text;
		$attachment['url'] = $attachment_url;

		if (!empty($attachment_img_src)) {
			$attachment['images'] = [
				0 => [
					'src'    => $attachment_img_src,
					'width'  => $attachment_img_width,
					'height' => $attachment_img_height
				]
			];
		} else {
			unset($attachment['images']);
		}

		$att_bbcode = "\n" . PageInfo::getFooterFromData($attachment);
		$body .= $att_bbcode;
	}

	// Convert links with empty descriptions to links without an explicit description
	$body = preg_replace('#\[url=([^\]]*?)\]\[/url\]#ism', '[url]$1[/url]', $body);

	if (!empty($orig_post)) {
		$str_group_allow   = $orig_post['allow_gid'];
		$str_contact_allow = $orig_post['allow_cid'];
		$str_group_deny    = $orig_post['deny_gid'];
		$str_contact_deny  = $orig_post['deny_cid'];
		$location          = $orig_post['location'];
		$coord             = $orig_post['coord'];
		$verb              = $orig_post['verb'];
		$objecttype        = $orig_post['object-type'];
		$app               = $orig_post['app'];
		$categories        = Post\Category::getTextByURIId($orig_post['uri-id'], $orig_post['uid']);
		$title             = trim($_REQUEST['title'] ?? '');
		$body              = trim($body);
		$private           = $orig_post['private'];
		$pubmail_enabled   = $orig_post['pubmail'];
		$network           = $orig_post['network'];
		$guid              = $orig_post['guid'];
		$extid             = $orig_post['extid'];
	} else {
		$aclFormatter = DI::aclFormatter();
		$str_contact_allow = isset($_REQUEST['contact_allow']) ? $aclFormatter->toString($_REQUEST['contact_allow']) : $user['allow_cid'] ?? '';
		$str_group_allow   = isset($_REQUEST['group_allow'])   ? $aclFormatter->toString($_REQUEST['group_allow'])   : $user['allow_gid'] ?? '';
		$str_contact_deny  = isset($_REQUEST['contact_deny'])  ? $aclFormatter->toString($_REQUEST['contact_deny'])  : $user['deny_cid']  ?? '';
		$str_group_deny    = isset($_REQUEST['group_deny'])    ? $aclFormatter->toString($_REQUEST['group_deny'])    : $user['deny_gid']  ?? '';

		$visibility = $_REQUEST['visibility'] ?? '';
		if ($visibility === 'public') {
			// The ACL selector introduced in version 2019.12 sends ACL input data even when the Public visibility is selected
			$str_contact_allow = $str_group_allow = $str_contact_deny = $str_group_deny = '';
		} else if ($visibility === 'custom') {
			// Since we know from the visibility parameter the item should be private, we have to prevent the empty ACL
			// case that would make it public. So we always append the author's contact id to the allowed contacts.
			// See https://github.com/friendica/friendica/issues/9672
			$str_contact_allow .= $aclFormatter->toString(Contact::getPublicIdByUserId($uid));
		}

		$title             = trim($_REQUEST['title']    ?? '');
		$location          = trim($_REQUEST['location'] ?? '');
		$coord             = trim($_REQUEST['coord']    ?? '');
		$verb              = trim($_REQUEST['verb']     ?? '');
		$emailcc           = trim($_REQUEST['emailcc']  ?? '');
		$body              = trim($body);
		$network           = trim(($_REQUEST['network']  ?? '') ?: Protocol::DFRN);
		$guid              = System::createUUID();

		$postopts = $_REQUEST['postopts'] ?? '';

		if (strlen($str_group_allow) || strlen($str_contact_allow) || strlen($str_group_deny) || strlen($str_contact_deny)) {
			$private = Item::PRIVATE;
		} elseif (DI::pConfig()->get($profile_uid, 'system', 'unlisted')) {
			$private = Item::UNLISTED;
		} else {
			$private = Item::PUBLIC;
		}

		// If this is a comment, set the permissions from the parent.

		if ($toplevel_item) {
			// for non native networks use the network of the original post as network of the item
			if (($toplevel_item['network'] != Protocol::DIASPORA)
				&& ($toplevel_item['network'] != Protocol::OSTATUS)
				&& ($network == '')) {
				$network = $toplevel_item['network'];
			}

			$str_contact_allow = $toplevel_item['allow_cid'] ?? '';
			$str_group_allow   = $toplevel_item['allow_gid'] ?? '';
			$str_contact_deny  = $toplevel_item['deny_cid'] ?? '';
			$str_group_deny    = $toplevel_item['deny_gid'] ?? '';
			$private           = $toplevel_item['private'];

			$wall              = $toplevel_item['wall'];
		}

		$pubmail_enabled = ($_REQUEST['pubmail_enable'] ?? false) && !$private;

		// if using the API, we won't see pubmail_enable - figure out if it should be set
		if ($api_source && $profile_uid && $profile_uid == DI::userSession()->getLocalUserId() && !$private) {
			if (function_exists('imap_open') && !DI::config()->get('system', 'imap_disabled')) {
				$pubmail_enabled = DBA::exists('mailacct', ["`uid` = ? AND `server` != ? AND `pubmail`", DI::userSession()->getLocalUserId(), '']);
			}
		}

		if (!strlen($body)) {
			if ($preview) {
				System::jsonExit(['preview' => '']);
			}

			DI::sysmsg()->addNotice(DI::l10n()->t('Empty post discarded.'));
			if ($return_path) {
				DI::baseUrl()->redirect($return_path);
			}

			throw new HTTPException\BadRequestException(DI::l10n()->t('Empty post discarded.'));
		}
	}

	if (!empty($categories)) {
		// get the "fileas" tags for this post
		$filedas = FileTag::fileToArray($categories);
	}

	$list_array = explode(',', trim($_REQUEST['category'] ?? ''));
	$categories = FileTag::arrayToFile($list_array, 'category');

	if (!empty($filedas) && is_array($filedas)) {
		// append the fileas stuff to the new categories list
		$categories .= FileTag::arrayToFile($filedas);
	}

	// get contact info for poster

	$author = null;
	$self   = false;
	$contact_id = 0;

	if (DI::userSession()->getLocalUserId() && ((DI::userSession()->getLocalUserId() == $profile_uid) || $allow_comment)) {
		$self = true;
		$author = DBA::selectFirst('contact', [], ['uid' => DI::userSession()->getLocalUserId(), 'self' => true]);
	} elseif (!empty(DI::userSession()->getRemoteContactID($profile_uid))) {
		$author = DBA::selectFirst('contact', [], ['id' => DI::userSession()->getRemoteContactID($profile_uid)]);
	}

	if (DBA::isResult($author)) {
		$contact_id = $author['id'];
	}

	// get contact info for owner
	if ($profile_uid == DI::userSession()->getLocalUserId() || $allow_comment) {
		$contact_record = $author ?: [];
	} else {
		$contact_record = DBA::selectFirst('contact', [], ['uid' => $profile_uid, 'self' => true]) ?: [];
	}

	// Personal notes must never be altered to a forum post.
	if ($posttype != Item::PT_PERSONAL_NOTE) {
		// Look for any tags and linkify them
		$item = [
			'uid'       => DI::userSession()->getLocalUserId() ? DI::userSession()->getLocalUserId() : $profile_uid,
			'gravity'   => $toplevel_item_id ? Item::GRAVITY_COMMENT : Item::GRAVITY_PARENT,
			'network'   => $network,
			'body'      => $body,
			'postopts'  => $postopts,
			'private'   => $private,
			'allow_cid' => $str_contact_allow,
			'allow_gid' => $str_group_allow,
			'deny_cid'  => $str_contact_deny,
			'deny_gid'  => $str_group_deny,
		];

		$item = DI::contentItem()->expandTags($item);

		$body              = $item['body'];
		$inform            = $item['inform'];
		$postopts          = $item['postopts'];
		$private           = $item['private'];
		$str_contact_allow = $item['allow_cid'];
		$str_group_allow   = $item['allow_gid'];
		$str_contact_deny  = $item['deny_cid'];
		$str_group_deny    = $item['deny_gid'];
	} else {
		$inform   = '';
	}

	/*
	 * When a photo was uploaded into the message using the (profile wall) ajax
	 * uploader, The permissions are initially set to disallow anybody but the
	 * owner from seeing it. This is because the permissions may not yet have been
	 * set for the post. If it's private, the photo permissions should be set
	 * appropriately. But we didn't know the final permissions on the post until
	 * now. So now we'll look for links of uploaded messages that are in the
	 * post and set them to the same permissions as the post itself.
	 */

	$match = null;

	if (!$preview && Photo::setPermissionFromBody($body, $uid, $contact_id, $str_contact_allow, $str_group_allow, $str_contact_deny, $str_group_deny)) {
		$objecttype = Activity\ObjectType::IMAGE;
	}

	/*
	 * Next link in any attachment references we find in the post.
	 */
	$match = [];

	/// @todo these lines should be moved to Model/Attach (Once it exists)
	if (!$preview && preg_match_all("/\[attachment\](.*?)\[\/attachment\]/", $body, $match)) {
		$attaches = $match[1];
		if (count($attaches)) {
			foreach ($attaches as $attach) {
				// Ensure to only modify attachments that you own
				$srch = '<' . intval($contact_id) . '>';

				$condition = [
					'allow_cid' => $srch,
					'allow_gid' => '',
					'deny_cid' => '',
					'deny_gid' => '',
					'id' => $attach,
				];
				if (!Attach::exists($condition)) {
					continue;
				}

				$fields = ['allow_cid' => $str_contact_allow, 'allow_gid' => $str_group_allow,
						'deny_cid' => $str_contact_deny, 'deny_gid' => $str_group_deny];
				$condition = ['id' => $attach];
				Attach::update($fields, $condition);
			}
		}
	}

	// embedded bookmark or attachment in post? set bookmark flag

	$data = BBCode::getAttachmentData($body);
	$match = [];
	if ((preg_match_all("/\[bookmark\=([^\]]*)\](.*?)\[\/bookmark\]/ism", $body, $match, PREG_SET_ORDER) || isset($data['type']))
		&& ($posttype != Item::PT_PERSONAL_NOTE)) {
		$posttype = Item::PT_PAGE;
		$objecttype =  Activity\ObjectType::BOOKMARK;
	}

	$body = DI::bbCodeVideo()->transform($body);

	$body = BBCode::scaleExternalImages($body);

	// Setting the object type if not defined before
	if (!$objecttype) {
		$objecttype = Activity\ObjectType::NOTE; // Default value
		$objectdata = BBCode::getAttachedData($body);

		if ($objectdata['type'] == 'link') {
			$objecttype = Activity\ObjectType::BOOKMARK;
		} elseif ($objectdata['type'] == 'video') {
			$objecttype = Activity\ObjectType::VIDEO;
		} elseif ($objectdata['type'] == 'photo') {
			$objecttype = Activity\ObjectType::IMAGE;
		}

	}

	$attachments = '';
	$match = [];

	if (preg_match_all('/(\[attachment\]([0-9]+)\[\/attachment\])/',$body,$match)) {
		foreach ($match[2] as $mtch) {
			$fields = ['id', 'filename', 'filesize', 'filetype'];
			$attachment = Attach::selectFirst($fields, ['id' => $mtch]);
			if ($attachment !== false) {
				if (strlen($attachments)) {
					$attachments .= ',';
				}
				$attachments .= Post\Media::getAttachElement(DI::baseUrl() . '/attach/' . $attachment['id'],
					$attachment['filesize'], $attachment['filetype'], $attachment['filename'] ?? '');
			}
			$body = str_replace($match[1],'',$body);
		}
	}

	if (!strlen($verb)) {
		$verb = Activity::POST;
	}

	if ($network == '') {
		$network = Protocol::DFRN;
	}

	$gravity = ($toplevel_item_id ? Item::GRAVITY_COMMENT : Item::GRAVITY_PARENT);

	// even if the post arrived via API we are considering that it
	// originated on this site by default for determining relayability.

	// Don't use "defaults" here. It would turn 0 to 1
	if (!isset($_REQUEST['origin'])) {
		$origin = 1;
	} else {
		$origin = $_REQUEST['origin'];
	}

	$uri = Item::newURI($guid);

	// Fallback so that we alway have a parent uri
	if (!$thr_parent_uri || !$toplevel_item_id) {
		$thr_parent_uri = $uri;
	}

	$datarray = [
		'uid'           => $profile_uid,
		'wall'          => $wall,
		'gravity'       => $gravity,
		'network'       => $network,
		'contact-id'    => $contact_id,
		'owner-name'    => $contact_record['name'] ?? '',
		'owner-link'    => $contact_record['url'] ?? '',
		'owner-avatar'  => $contact_record['thumb'] ?? '',
		'author-name'   => $author['name'],
		'author-link'   => $author['url'],
		'author-avatar' => $author['thumb'],
		'created'       => empty($_REQUEST['created_at']) ? DateTimeFormat::utcNow() : $_REQUEST['created_at'],
		'received'      => DateTimeFormat::utcNow(),
		'extid'         => $extid,
		'guid'          => $guid,
		'uri'           => $uri,
		'title'         => $title,
		'body'          => $body,
		'app'           => $app,
		'location'      => $location,
		'coord'         => $coord,
		'file'          => $categories,
		'inform'        => $inform,
		'verb'          => $verb,
		'post-type'     => $posttype,
		'object-type'   => $objecttype,
		'allow_cid'     => $str_contact_allow,
		'allow_gid'     => $str_group_allow,
		'deny_cid'      => $str_contact_deny,
		'deny_gid'      => $str_group_deny,
		'private'       => $private,
		'pubmail'       => $pubmail_enabled,
		'attach'        => $attachments,
		'thr-parent'    => $thr_parent_uri,
		'postopts'      => $postopts,
		'origin'        => $origin,
		'object'        => $object,
		'attachments'   => $_REQUEST['attachments'] ?? [],
		/*
		 * These fields are for the convenience of addons...
		 * 'self' if true indicates the owner is posting on their own wall
		 * If parent is 0 it is a top-level post.
		 */
		'parent'        => $toplevel_item_id,
		'self'          => $self,
		// This triggers posts via API and the mirror functions
		'api_source'    => $api_source,
		// This field is for storing the raw conversation data
		'protocol'      => Conversation::PARCEL_DIRECT,
		'direction'     => Conversation::PUSH,
	];

	// These cannot be part of above initialization ...
	$datarray['edited']    = $datarray['created'];
	$datarray['commented'] = $datarray['created'];
	$datarray['changed']   = $datarray['created'];
	$datarray['owner-id']  = Contact::getIdForURL($datarray['owner-link']);
	$datarray['author-id'] = Contact::getIdForURL($datarray['author-link']);

	$datarray['edit'] = $orig_post;

	// Check for hashtags in the body and repair or add hashtag links
	if ($preview || $orig_post) {
		$datarray['body'] = Item::setHashtags($datarray['body']);
	}

	// preview mode - prepare the body for display and send it via json
	if ($preview) {
		// We set the datarray ID to -1 because in preview mode the dataray
		// doesn't have an ID.
		$datarray['id'] = -1;
		$datarray['uri-id'] = -1;
		$datarray['author-network'] = Protocol::DFRN;
		$datarray['author-updated'] = '';
		$datarray['author-gsid'] = 0;
		$datarray['author-uri-id'] = ItemURI::getIdByURI($datarray['author-link']);
		$datarray['owner-updated'] = '';
		$datarray['has-media'] = false;
		$datarray['body'] = Item::improveSharedDataInBody($datarray);

		$o = DI::conversation()->create([array_merge($contact_record, $datarray)], 'search', false, true);

		System::jsonExit(['preview' => $o]);
	}

	Hook::callAll('post_local',$datarray);

	if (!empty($_REQUEST['scheduled_at'])) {
		$scheduled_at = DateTimeFormat::convert($_REQUEST['scheduled_at'], 'UTC', $a->getTimeZone());
		if ($scheduled_at > DateTimeFormat::utcNow()) {
			unset($datarray['created']);
			unset($datarray['edited']);
			unset($datarray['commented']);
			unset($datarray['received']);
			unset($datarray['changed']);
			unset($datarray['edit']);
			unset($datarray['self']);
			unset($datarray['api_source']);

			Post\Delayed::add($datarray['uri'], $datarray, Worker::PRIORITY_HIGH, Post\Delayed::PREPARED_NO_HOOK, $scheduled_at);
			item_post_return(DI::baseUrl(), $api_source, $return_path);
		}
	}

	if (!empty($datarray['cancel'])) {
		Logger::info('mod_item: post cancelled by addon.');
		if ($return_path) {
			DI::baseUrl()->redirect($return_path);
		}

		$json = ['cancel' => 1];
		if (!empty($_REQUEST['jsreload'])) {
			$json['reload'] = DI::baseUrl() . '/' . $_REQUEST['jsreload'];
		}

		System::jsonExit($json);
	}

	$datarray['uri-id'] = ItemURI::getIdByURI($datarray['uri']);
	$datarray['body']   = Item::improveSharedDataInBody($datarray);

	if ($orig_post) {
		$fields = [
			'title'   => $datarray['title'],
			'body'    => $datarray['body'],
			'attach'  => $datarray['attach'],
			'file'    => $datarray['file'],
			'edited'  => DateTimeFormat::utcNow(),
			'changed' => DateTimeFormat::utcNow()
		];

		Item::update($fields, ['id' => $post_id]);
		Item::updateDisplayCache($datarray['uri-id']);

		if ($return_path) {
			DI::baseUrl()->redirect($return_path);
		}

		throw new HTTPException\OKException(DI::l10n()->t('Post updated.'));
	}

	unset($datarray['edit']);
	unset($datarray['self']);
	unset($datarray['api_source']);

	$post_id = Item::insert($datarray);

	if (!$post_id) {
		DI::sysmsg()->addNotice(DI::l10n()->t('Item wasn\'t stored.'));
		if ($return_path) {
			DI::baseUrl()->redirect($return_path);
		}

		throw new HTTPException\InternalServerErrorException(DI::l10n()->t('Item wasn\'t stored.'));
	}

	$datarray = Post::selectFirst(Item::ITEM_FIELDLIST, ['id' => $post_id]);

	if (!DBA::isResult($datarray)) {
		Logger::error('Item couldn\'t be fetched.', ['post_id' => $post_id]);
		if ($return_path) {
			DI::baseUrl()->redirect($return_path);
		}

		throw new HTTPException\InternalServerErrorException(DI::l10n()->t('Item couldn\'t be fetched.'));
	}

	Tag::storeFromBody($datarray['uri-id'], $datarray['body']);

	if (!\Friendica\Content\Feature::isEnabled($uid, 'explicit_mentions') && ($datarray['gravity'] == Item::GRAVITY_COMMENT)) {
		Tag::createImplicitMentions($datarray['uri-id'], $datarray['thr-parent-id']);
	}

	// These notifications are sent if someone else is commenting other your wall
	if ($contact_record != $author) {
		if ($toplevel_item_id) {
			DI::notify()->createFromArray([
				'type'  => Notification\Type::COMMENT,
				'otype' => Notification\ObjectType::ITEM,
				'verb'  => Activity::POST,
				'uid'   => $profile_uid,
				'cid'   => $datarray['author-id'],
				'item'  => $datarray,
				'link'  => DI::baseUrl() . '/display/' . urlencode($datarray['guid']),
			]);
		} elseif (empty($forum_contact)) {
			DI::notify()->createFromArray([
				'type'  => Notification\Type::WALL,
				'otype' => Notification\ObjectType::ITEM,
				'verb'  => Activity::POST,
				'uid'   => $profile_uid,
				'cid'   => $datarray['author-id'],
				'item'  => $datarray,
				'link'  => DI::baseUrl() . '/display/' . urlencode($datarray['guid']),
			]);
		}
	}

	Hook::callAll('post_local_end', $datarray);

	if (strlen($emailcc) && $profile_uid == DI::userSession()->getLocalUserId()) {
		$recipients = explode(',', $emailcc);
		if (count($recipients)) {
			foreach ($recipients as $recipient) {
				$address = trim($recipient);
				if (!strlen($address)) {
					continue;
				}
				DI::emailer()->send(new ItemCCEMail(DI::app(), DI::l10n(), DI::baseUrl(),
					$datarray, $address, $author['thumb'] ?? ''));
			}
		}
	}

	Logger::debug('post_complete');

	if ($api_source) {
		return $post_id;
	}

	item_post_return(DI::baseUrl(), $api_source, $return_path);
	// NOTREACHED
}

function item_post_return($baseurl, $api_source, $return_path)
{
	if ($api_source) {
		return;
	}

	if ($return_path) {
		DI::baseUrl()->redirect($return_path);
	}

	$json = ['success' => 1];
	if (!empty($_REQUEST['jsreload'])) {
		$json['reload'] = $baseurl . '/' . $_REQUEST['jsreload'];
	}

	Logger::debug('post_json', ['json' => $json]);

	System::jsonExit($json);
}

function item_content(App $a)
{
	if (!DI::userSession()->isAuthenticated()) {
		throw new HTTPException\UnauthorizedException();
	}

	$args = DI::args();

	if (!$args->has(3)) {
		throw new HTTPException\BadRequestException();
	}

	$o = '';
	switch ($args->get(1)) {
		case 'drop':
			if (DI::mode()->isAjax()) {
				Item::deleteForUser(['id' => $args->get(2)], DI::userSession()->getLocalUserId());
				// ajax return: [<item id>, 0 (no perm) | <owner id>]
				System::jsonExit([intval($args->get(2)), DI::userSession()->getLocalUserId()]);
			} else {
				if (!empty($args->get(3))) {
					$o = drop_item($args->get(2), $args->get(3));
				} else {
					$o = drop_item($args->get(2));
				}
			}
			break;

		case 'block':
			$item = Post::selectFirstForUser(DI::userSession()->getLocalUserId(), ['guid', 'author-id', 'parent', 'gravity'], ['id' => $args->get(2)]);
			if (empty($item['author-id'])) {
				throw new HTTPException\NotFoundException('Item not found');
			}

			Contact\User::setBlocked($item['author-id'], DI::userSession()->getLocalUserId(), true);

			if (DI::mode()->isAjax()) {
				// ajax return: [<item id>, 0 (no perm) | <owner id>]
				System::jsonExit([intval($args->get(2)), DI::userSession()->getLocalUserId()]);
			} else {
				item_redirect_after_action($item, $args->get(3));
			}
			break;
	}

	return $o;
}

/**
 * @param int    $id
 * @param string $return
 * @return string
 * @throws HTTPException\InternalServerErrorException
 */
function drop_item(int $id, string $return = ''): string
{
	// Locate item to be deleted
	$item = Post::selectFirstForUser(DI::userSession()->getLocalUserId(), ['id', 'uid', 'guid', 'contact-id', 'deleted', 'gravity', 'parent'], ['id' => $id]);

	if (!DBA::isResult($item)) {
		DI::sysmsg()->addNotice(DI::l10n()->t('Item not found.'));
		DI::baseUrl()->redirect('network');
		//NOTREACHED
	}

	if ($item['deleted']) {
		return '';
	}

	$contact_id = 0;

	// check if logged in user is either the author or owner of this item
	if (DI::userSession()->getRemoteContactID($item['uid']) == $item['contact-id']) {
		$contact_id = $item['contact-id'];
	}

	if ((DI::userSession()->getLocalUserId() == $item['uid']) || $contact_id) {
		// delete the item
		Item::deleteForUser(['id' => $item['id']], DI::userSession()->getLocalUserId());

		item_redirect_after_action($item, $return);
		//NOTREACHED
	} else {
		Logger::warning('Permission denied.', ['local' => DI::userSession()->getLocalUserId(), 'uid' => $item['uid'], 'cid' => $contact_id]);
		DI::sysmsg()->addNotice(DI::l10n()->t('Permission denied.'));
		DI::baseUrl()->redirect('display/' . $item['guid']);
		//NOTREACHED
	}

	return '';
}

function item_redirect_after_action(array $item, string $returnUrlHex)
{
	$return_url = hex2bin($returnUrlHex);

	// removes update_* from return_url to ignore Ajax refresh
	$return_url = str_replace('update_', '', $return_url);

	// Check if delete a comment
	if ($item['gravity'] == Item::GRAVITY_COMMENT) {
		if (!empty($item['parent'])) {
			$parentitem = Post::selectFirstForUser(DI::userSession()->getLocalUserId(), ['guid'], ['id' => $item['parent']]);
		}

		// Return to parent guid
		if (!empty($parentitem)) {
			DI::baseUrl()->redirect('display/' . $parentitem['guid']);
			//NOTREACHED
		} // In case something goes wrong
		else {
			DI::baseUrl()->redirect('network');
			//NOTREACHED
		}
	} else {
		// if unknown location or deleting top level post called from display
		if (empty($return_url) || strpos($return_url, 'display') !== false) {
			DI::baseUrl()->redirect('network');
			//NOTREACHED
		} else {
			DI::baseUrl()->redirect($return_url);
			//NOTREACHED
		}
	}
}