//.........这里部分代码省略.........
        activity_sanitise($arr['object']);
        $arr['object'] = json_encode($arr['object']);
    }
    if (x($arr, 'target') && is_array($arr['target'])) {
        activity_sanitise($arr['target']);
        $arr['target'] = json_encode($arr['target']);
    }
    if (x($arr, 'attach') && is_array($arr['attach'])) {
        activity_sanitise($arr['attach']);
        $arr['attach'] = json_encode($arr['attach']);
    }
    unset($arr['id']);
    unset($arr['uid']);
    unset($arr['aid']);
    unset($arr['mid']);
    unset($arr['parent']);
    unset($arr['parent_mid']);
    unset($arr['created']);
    unset($arr['author_xchan']);
    unset($arr['owner_xchan']);
    unset($arr['thr_parent']);
    unset($arr['llink']);
    $arr['edited'] = x($arr, 'edited') !== false ? datetime_convert('UTC', 'UTC', $arr['edited']) : datetime_convert();
    $arr['expires'] = x($arr, 'expires') !== false ? datetime_convert('UTC', 'UTC', $arr['expires']) : $orig[0]['expires'];
    if (array_key_exists('comments_closed', $arr) && $arr['comments_closed'] != NULL_DATE) {
        $arr['comments_closed'] = datetime_convert('UTC', 'UTC', $arr['comments_closed']);
    } else {
        $arr['comments_closed'] = $orig[0]['comments_closed'];
    }
    $arr['commented'] = $orig[0]['commented'];
    $arr['received'] = datetime_convert();
    $arr['changed'] = datetime_convert();
    $arr['route'] = array_key_exists('route', $arr) ? trim($arr['route']) : $orig[0]['route'];
    $arr['diaspora_meta'] = x($arr, 'diaspora_meta') ? $arr['diaspora_meta'] : $orig[0]['diaspora_meta'];
    $arr['location'] = x($arr, 'location') ? notags(trim($arr['location'])) : $orig[0]['location'];
    $arr['coord'] = x($arr, 'coord') ? notags(trim($arr['coord'])) : $orig[0]['coord'];
    $arr['verb'] = x($arr, 'verb') ? notags(trim($arr['verb'])) : $orig[0]['verb'];
    $arr['obj_type'] = x($arr, 'obj_type') ? notags(trim($arr['obj_type'])) : $orig[0]['obj_type'];
    $arr['object'] = x($arr, 'object') ? trim($arr['object']) : $orig[0]['object'];
    $arr['tgt_type'] = x($arr, 'tgt_type') ? notags(trim($arr['tgt_type'])) : $orig[0]['tgt_type'];
    $arr['target'] = x($arr, 'target') ? trim($arr['target']) : $orig[0]['target'];
    $arr['plink'] = x($arr, 'plink') ? notags(trim($arr['plink'])) : $orig[0]['plink'];
    $arr['allow_cid'] = array_key_exists('allow_cid', $arr) ? trim($arr['allow_cid']) : $orig[0]['allow_cid'];
    $arr['allow_gid'] = array_key_exists('allow_gid', $arr) ? trim($arr['allow_gid']) : $orig[0]['allow_gid'];
    $arr['deny_cid'] = array_key_exists('deny_cid', $arr) ? trim($arr['deny_cid']) : $orig[0]['deny_cid'];
    $arr['deny_gid'] = array_key_exists('deny_gid', $arr) ? trim($arr['deny_gid']) : $orig[0]['deny_gid'];
    $arr['item_private'] = array_key_exists('item_private', $arr) ? intval($arr['item_private']) : $orig[0]['item_private'];
    $arr['title'] = array_key_exists('title', $arr) ? trim($arr['title']) : $orig[0]['title'];
    $arr['body'] = array_key_exists('body', $arr) ? trim($arr['body']) : $orig[0]['body'];
    $arr['attach'] = x($arr, 'attach') ? notags(trim($arr['attach'])) : $orig[0]['attach'];
    $arr['app'] = x($arr, 'app') ? notags(trim($arr['app'])) : $orig[0]['app'];
    //	$arr['item_restrict'] = ((x($arr,'item_restrict')) ? intval($arr['item_restrict'])       : $orig[0]['item_restrict'] );
    //	$arr['item_flags']    = ((x($arr,'item_flags'))    ? intval($arr['item_flags'])          : $orig[0]['item_flags'] );
    $arr['sig'] = x($arr, 'sig') ? $arr['sig'] : '';
    $arr['layout_mid'] = array_key_exists('layout_mid', $arr) ? dbesc($arr['layout_mid']) : $orig[0]['layout_mid'];
    $arr['public_policy'] = x($arr, 'public_policy') ? notags(trim($arr['public_policy'])) : $orig[0]['public_policy'];
    $arr['comment_policy'] = x($arr, 'comment_policy') ? notags(trim($arr['comment_policy'])) : $orig[0]['comment_policy'];
    call_hooks('post_remote_update', $arr);
    if (x($arr, 'cancel')) {
        logger('item_store_update: post cancelled by plugin.');
        $ret['message'] = 'cancelled.';
        return $ret;
    }
    // pull out all the taxonomy stuff for separate storage
    $terms = null;
    if (array_key_exists('term', $arr)) {
        $terms = $arr['term'];
        unset($arr['term']);
    }
    dbesc_array($arr);
    logger('item_store_update: ' . print_r($arr, true), LOGGER_DATA);
    $str = '';
    foreach ($arr as $k => $v) {
        if ($str) {
            $str .= ",";
        }
        $str .= " `" . $k . "` = '" . $v . "' ";
    }
    $r = dbq("update `item` set " . $str . " where id = " . $orig_post_id);
    if ($r) {
        logger('item_store_update: updated item ' . $orig_post_id, LOGGER_DEBUG);
    } else {
        logger('item_store_update: could not update item');
        $ret['message'] = 'DB update failed.';
        return $ret;
    }
    $r = q("delete from term where oid = %d and otype = %d", intval($orig_post_id), intval(TERM_OBJ_POST));
    if (is_array($terms)) {
        foreach ($terms as $t) {
            q("insert into term (uid,oid,otype,type,term,url)\n\t\t\t\tvalues(%d,%d,%d,%d,'%s','%s') ", intval($uid), intval($orig_post_id), intval(TERM_OBJ_POST), intval($t['type']), dbesc($t['term']), dbesc($t['url']));
        }
        $arr['term'] = $terms;
    }
    call_hooks('post_remote_update_end', $arr);
    send_status_notifications($orig_post_id, $arr);
    tag_deliver($uid, $orig_post_id);
    $ret['success'] = true;
    $ret['item_id'] = $orig_post_id;
    return $ret;
}

/**
 * @brief Deletes an imported item.
 *
 * @param array $sender
 *   * \e string \b hash a xchan_hash
 * @param array $item
 * @param int $uid
 * @param boolean $relay
 * @return boolean|int post_id
 */
function delete_imported_item($sender, $item, $uid, $relay)
{
    logger('delete_imported_item invoked', LOGGER_DEBUG);
    $ownership_valid = false;
    $item_found = false;
    $post_id = 0;
    $r = q("select id, author_xchan, owner_xchan, source_xchan, item_deleted from item where ( author_xchan = '%s' or owner_xchan = '%s' or source_xchan = '%s' )\n\t\tand mid = '%s' and uid = %d limit 1", dbesc($sender['hash']), dbesc($sender['hash']), dbesc($sender['hash']), dbesc($item['mid']), intval($uid));
    if ($r) {
        if ($r[0]['author_xchan'] === $sender['hash'] || $r[0]['owner_xchan'] === $sender['hash'] || $r[0]['source_xchan'] === $sender['hash']) {
            $ownership_valid = true;
        }
        $post_id = $r[0]['id'];
        $item_found = true;
    } else {
        // perhaps the item is still in transit and the delete notification got here before the actual item did. Store it with the deleted flag set.
        // item_store() won't try to deliver any notifications or start delivery chains if this flag is set.
        // This means we won't end up with potentially even more delivery threads trying to push this delete notification.
        // But this will ensure that if the (undeleted) original post comes in at a later date, we'll reject it because it will have an older timestamp.
        logger('delete received for non-existent item - storing item data.');
        /** @BUG $arr is undefined here, so this is dead code */
        if ($arr['author_xchan'] === $sender['hash'] || $arr['owner_xchan'] === $sender['hash'] || $arr['source_xchan'] === $sender['hash']) {
            $ownership_valid = true;
            $item_result = item_store($arr);
            $post_id = $item_result['item_id'];
        }
    }
    if ($ownership_valid === false) {
        logger('delete_imported_item: failed: ownership issue');
        return false;
    }
    require_once 'include/items.php';
    if ($item_found) {
        if (intval($r[0]['item_deleted'])) {
            logger('delete_imported_item: item was already deleted');
            if (!$relay) {
                return false;
            }
            // This is a bit hackish, but may have to suffice until the notification/delivery loop is optimised
            // a bit further. We're going to strip the ITEM_ORIGIN on this item if it's a comment, because
            // it was already deleted, and we're already relaying, and this ensures that no other process or
            // code path downstream can relay it again (causing a loop). Since it's already gone it's not coming
            // back, and we aren't going to (or shouldn't at any rate) delete it again in the future - so losing
            // this information from the metadata should have no other discernible impact.
            if ($r[0]['id'] != $r[0]['parent'] && intval($r[0]['item_origin'])) {
                q("update item set item_origin = 0 where id = %d and uid = %d", intval($r[0]['id']), intval($r[0]['uid']));
            }
        }
        require_once 'include/items.php';
        // Use phased deletion to set the deleted flag, call both tag_deliver and the notifier to notify downstream channels
        // and then clean up after ourselves with a cron job after several days to do the delete_item_lowlevel() (DROPITEM_PHASE2).
        drop_item($post_id, false, DROPITEM_PHASE1);
        tag_deliver($uid, $post_id);
    }
    return $post_id;
}

//.........这里部分代码省略.........
            if ($isforum) {
                $update = true;
            }
        }
        if ($update) {
            q("UPDATE `contact` SET `success_update` = '%s', `last-item` = '%s' WHERE `id` = %d", dbesc($arr['received']), dbesc($arr['received']), intval($arr['contact-id']));
        }
    } else {
        logger('item_store: could not locate created item');
        return 0;
    }
    if (!$parent_id || $arr['parent-uri'] === $arr['uri']) {
        $parent_id = $current_post;
    }
    if (strlen($allow_cid) || strlen($allow_gid) || strlen($deny_cid) || strlen($deny_gid)) {
        $private = 1;
    } else {
        $private = $arr['private'];
    }
    // Set parent id - and also make sure to inherit the parent's ACLs.
    $r = q("UPDATE `item` SET `parent` = %d, `allow_cid` = '%s', `allow_gid` = '%s',\n\t\t`deny_cid` = '%s', `deny_gid` = '%s', `private` = %d, `deleted` = %d WHERE `id` = %d", intval($parent_id), dbesc($allow_cid), dbesc($allow_gid), dbesc($deny_cid), dbesc($deny_gid), intval($private), intval($parent_deleted), intval($current_post));
    $arr['id'] = $current_post;
    $arr['parent'] = $parent_id;
    $arr['allow_cid'] = $allow_cid;
    $arr['allow_gid'] = $allow_gid;
    $arr['deny_cid'] = $deny_cid;
    $arr['deny_gid'] = $deny_gid;
    $arr['private'] = $private;
    $arr['deleted'] = $parent_deleted;
    // update the commented timestamp on the parent
    // Only update "commented" if it is really a comment
    if ($arr['verb'] == ACTIVITY_POST or !get_config("system", "like_no_comment")) {
        q("UPDATE `item` SET `commented` = '%s', `changed` = '%s' WHERE `id` = %d", dbesc(datetime_convert()), dbesc(datetime_convert()), intval($parent_id));
    } else {
        q("UPDATE `item` SET `changed` = '%s' WHERE `id` = %d", dbesc(datetime_convert()), intval($parent_id));
    }
    if ($dsprsig) {
        q("insert into sign (`iid`,`signed_text`,`signature`,`signer`) values (%d,'%s','%s','%s') ", intval($current_post), dbesc($dsprsig->signed_text), dbesc($dsprsig->signature), dbesc($dsprsig->signer));
    }
    /**
     * If this is now the last-child, force all _other_ children of this parent to *not* be last-child
     */
    if ($arr['last-child']) {
        $r = q("UPDATE `item` SET `last-child` = 0 WHERE `parent-uri` = '%s' AND `uid` = %d AND `id` != %d", dbesc($arr['uri']), intval($arr['uid']), intval($current_post));
    }
    $deleted = tag_deliver($arr['uid'], $current_post);
    // current post can be deleted if is for a community page and no mention are
    // in it.
    if (!$deleted and !$dontcache) {
        $r = q('SELECT * FROM `item` WHERE id = %d', intval($current_post));
        if (count($r) == 1) {
            if ($notify) {
                call_hooks('post_local_end', $r[0]);
            } else {
                call_hooks('post_remote_end', $r[0]);
            }
        } else {
            logger('item_store: new item not found in DB, id ' . $current_post);
        }
    }
    // Add every contact of the post to the global contact table
    poco_store($arr);
    create_tags_from_item($current_post);
    create_files_from_item($current_post);
    // Only check for notifications on start posts
    if ($arr['parent-uri'] === $arr['uri']) {
        add_thread($current_post);
        logger('item_store: Check notification for contact ' . $arr['contact-id'] . ' and post ' . $current_post, LOGGER_DEBUG);
        // Send a notification for every new post?
        $r = q("SELECT `notify_new_posts` FROM `contact` WHERE `id` = %d AND `uid` = %d AND `notify_new_posts` LIMIT 1", intval($arr['contact-id']), intval($arr['uid']));
        $send_notification = count($r);
        if (!$send_notification) {
            $tags = q("SELECT `url` FROM `term` WHERE `otype` = %d AND `oid` = %d AND `type` = %d AND `uid` = %d", intval(TERM_OBJ_POST), intval($current_post), intval(TERM_MENTION), intval($arr['uid']));
            if (count($tags)) {
                foreach ($tags as $tag) {
                    $r = q("SELECT `id` FROM `contact` WHERE `nurl` = '%s' AND `uid` = %d AND `notify_new_posts`", normalise_link($tag["url"]), intval($arr['uid']));
                    if (count($r)) {
                        $send_notification = true;
                    }
                }
            }
        }
        if ($send_notification) {
            logger('item_store: Send notification for contact ' . $arr['contact-id'] . ' and post ' . $current_post, LOGGER_DEBUG);
            $u = q("SELECT * FROM user WHERE uid = %d LIMIT 1", intval($arr['uid']));
            $item = q("SELECT * FROM `item` WHERE `id` = %d AND `uid` = %d", intval($current_post), intval($arr['uid']));
            $a = get_app();
            require_once 'include/enotify.php';
            notification(array('type' => NOTIFY_SHARE, 'notify_flags' => $u[0]['notify-flags'], 'language' => $u[0]['language'], 'to_name' => $u[0]['username'], 'to_email' => $u[0]['email'], 'uid' => $u[0]['uid'], 'item' => $item[0], 'link' => $a->get_baseurl() . '/display/' . urlencode($arr['guid']), 'source_name' => $item[0]['author-name'], 'source_link' => $item[0]['author-link'], 'source_photo' => $item[0]['author-avatar'], 'verb' => ACTIVITY_TAG, 'otype' => 'item', 'parent' => $arr['parent']));
            logger('item_store: Notification sent for contact ' . $arr['contact-id'] . ' and post ' . $current_post, LOGGER_DEBUG);
        }
    } else {
        update_thread($parent_id);
        add_shadow_entry($arr);
    }
    if ($notify) {
        proc_run('php', "include/notifier.php", $notify_type, $current_post);
    }
    return $current_post;
}

function item_content(&$a)
{
    if (!local_channel() && !remote_channel()) {
        return;
    }
    require_once 'include/security.php';
    if (argc() == 3 && argv(1) === 'drop' && intval(argv(2))) {
        require_once 'include/items.php';
        $i = q("select id, uid, author_xchan, owner_xchan, source_xchan, item_restrict from item where id = %d limit 1", intval(argv(2)));
        if ($i) {
            $can_delete = false;
            $local_delete = false;
            if (local_channel() && local_channel() == $i[0]['uid']) {
                $local_delete = true;
            }
            $sys = get_sys_channel();
            if (is_site_admin() && $sys['channel_id'] == $i[0]['uid']) {
                $can_delete = true;
            }
            $ob_hash = get_observer_hash();
            if ($ob_hash && ($ob_hash === $i[0]['author_xchan'] || $ob_hash === $i[0]['owner_xchan'] || $ob_hash === $i[0]['source_xchan'])) {
                $can_delete = true;
            }
            if (!($can_delete || $local_delete)) {
                notice(t('Permission denied.') . EOL);
                return;
            }
            // if this is a different page type or it's just a local delete
            // but not by the item author or owner, do a simple deletion
            if ($i[0]['item_restrict'] || $local_delete && !$can_delete) {
                drop_item($i[0]['id']);
            } else {
                // complex deletion that needs to propagate and be performed in phases
                drop_item($i[0]['id'], true, DROPITEM_PHASE1);
                tag_deliver($i[0]['uid'], $i[0]['id']);
            }
        }
    }
}

//.........这里部分代码省略.........
    $arr['allow_cid'] = array_key_exists('allow_cid', $arr) ? trim($arr['allow_cid']) : $orig[0]['allow_cid'];
    $arr['allow_gid'] = array_key_exists('allow_gid', $arr) ? trim($arr['allow_gid']) : $orig[0]['allow_gid'];
    $arr['deny_cid'] = array_key_exists('deny_cid', $arr) ? trim($arr['deny_cid']) : $orig[0]['deny_cid'];
    $arr['deny_gid'] = array_key_exists('deny_gid', $arr) ? trim($arr['deny_gid']) : $orig[0]['deny_gid'];
    $arr['item_private'] = array_key_exists('item_private', $arr) ? intval($arr['item_private']) : $orig[0]['item_private'];
    $arr['title'] = array_key_exists('title', $arr) && strlen($arr['title']) ? trim($arr['title']) : '';
    $arr['body'] = array_key_exists('body', $arr) && strlen($arr['body']) ? trim($arr['body']) : '';
    $arr['html'] = array_key_exists('html', $arr) && strlen($arr['html']) ? trim($arr['html']) : '';
    $arr['attach'] = array_key_exists('attach', $arr) ? notags(trim($arr['attach'])) : $orig[0]['attach'];
    $arr['app'] = array_key_exists('app', $arr) ? notags(trim($arr['app'])) : $orig[0]['app'];
    $arr['item_origin'] = array_key_exists('item_origin', $arr) ? intval($arr['item_origin']) : $orig[0]['item_origin'];
    $arr['item_unseen'] = array_key_exists('item_unseen', $arr) ? intval($arr['item_unseen']) : $orig[0]['item_unseen'];
    $arr['item_starred'] = array_key_exists('item_starred', $arr) ? intval($arr['item_starred']) : $orig[0]['item_starred'];
    $arr['item_uplink'] = array_key_exists('item_uplink', $arr) ? intval($arr['item_uplink']) : $orig[0]['item_uplink'];
    $arr['item_consensus'] = array_key_exists('item_consensus', $arr) ? intval($arr['item_consensus']) : $orig[0]['item_consensus'];
    $arr['item_wall'] = array_key_exists('item_wall', $arr) ? intval($arr['item_wall']) : $orig[0]['item_wall'];
    $arr['item_thread_top'] = array_key_exists('item_thread_top', $arr) ? intval($arr['item_thread_top']) : $orig[0]['item_thread_top'];
    $arr['item_notshown'] = array_key_exists('item_notshown', $arr) ? intval($arr['item_notshown']) : $orig[0]['item_notshown'];
    $arr['item_nsfw'] = array_key_exists('item_nsfw', $arr) ? intval($arr['item_nsfw']) : $orig[0]['item_nsfw'];
    $arr['item_relay'] = array_key_exists('item_relay', $arr) ? intval($arr['item_relay']) : $orig[0]['item_relay'];
    $arr['item_mentionsme'] = array_key_exists('item_mentionsme', $arr) ? intval($arr['item_mentionsme']) : $orig[0]['item_mentionsme'];
    $arr['item_nocomment'] = array_key_exists('item_nocomment', $arr) ? intval($arr['item_nocomment']) : $orig[0]['item_nocomment'];
    $arr['item_obscured'] = array_key_exists('item_obscured', $arr) ? intval($arr['item_obscured']) : $orig[0]['item_obscured'];
    $arr['item_verified'] = array_key_exists('item_verified', $arr) ? intval($arr['item_verified']) : $orig[0]['item_verified'];
    $arr['item_retained'] = array_key_exists('item_retained', $arr) ? intval($arr['item_retained']) : $orig[0]['item_retained'];
    $arr['item_rss'] = array_key_exists('item_rss', $arr) ? intval($arr['item_rss']) : $orig[0]['item_rss'];
    $arr['item_deleted'] = array_key_exists('item_deleted', $arr) ? intval($arr['item_deleted']) : $orig[0]['item_deleted'];
    $arr['item_type'] = array_key_exists('item_type', $arr) ? intval($arr['item_type']) : $orig[0]['item_type'];
    $arr['item_hidden'] = array_key_exists('item_hidden', $arr) ? intval($arr['item_hidden']) : $orig[0]['item_hidden'];
    $arr['item_unpublished'] = array_key_exists('item_unpublished', $arr) ? intval($arr['item_unpublished']) : $orig[0]['item_unpublished'];
    $arr['item_delayed'] = array_key_exists('item_delayed', $arr) ? intval($arr['item_delayed']) : $orig[0]['item_delayed'];
    $arr['item_pending_remove'] = array_key_exists('item_pending_remove', $arr) ? intval($arr['item_pending_remove']) : $orig[0]['item_pending_remove'];
    $arr['item_blocked'] = array_key_exists('item_blocked', $arr) ? intval($arr['item_blocked']) : $orig[0]['item_blocked'];
    $arr['sig'] = x($arr, 'sig') ? $arr['sig'] : '';
    $arr['layout_mid'] = array_key_exists('layout_mid', $arr) ? dbesc($arr['layout_mid']) : $orig[0]['layout_mid'];
    $arr['public_policy'] = x($arr, 'public_policy') ? notags(trim($arr['public_policy'])) : $orig[0]['public_policy'];
    $arr['comment_policy'] = x($arr, 'comment_policy') ? notags(trim($arr['comment_policy'])) : $orig[0]['comment_policy'];
    call_hooks('post_remote_update', $arr);
    if (x($arr, 'cancel')) {
        logger('item_store_update: post cancelled by plugin.');
        $ret['message'] = 'cancelled.';
        return $ret;
    }
    // pull out all the taxonomy stuff for separate storage
    $terms = null;
    if (array_key_exists('term', $arr)) {
        $terms = $arr['term'];
        unset($arr['term']);
    }
    $meta = null;
    if (array_key_exists('iconfig', $arr)) {
        $meta = $arr['iconfig'];
        unset($arr['iconfig']);
    }
    dbesc_array($arr);
    logger('item_store_update: ' . print_r($arr, true), LOGGER_DATA);
    $str = '';
    foreach ($arr as $k => $v) {
        if ($str) {
            $str .= ",";
        }
        $str .= " `" . $k . "` = '" . $v . "' ";
    }
    $r = dbq("update `item` set " . $str . " where id = " . $orig_post_id);
    if ($r) {
        logger('item_store_update: updated item ' . $orig_post_id, LOGGER_DEBUG);
    } else {
        logger('item_store_update: could not update item');
        $ret['message'] = 'DB update failed.';
        return $ret;
    }
    // fetch an unescaped complete copy of the stored item
    $r = q("select * from item where id = %d", intval($orig_post_id));
    if ($r) {
        $arr = $r[0];
    }
    $r = q("delete from term where oid = %d and otype = %d", intval($orig_post_id), intval(TERM_OBJ_POST));
    if (is_array($terms)) {
        foreach ($terms as $t) {
            q("insert into term (uid,oid,otype,ttype,term,url)\n\t\t\t\tvalues(%d,%d,%d,%d,'%s','%s') ", intval($uid), intval($orig_post_id), intval(TERM_OBJ_POST), intval($t['ttype']), dbesc($t['term']), dbesc($t['url']));
        }
        $arr['term'] = $terms;
    }
    $r = q("delete from iconfig where iid = %d", intval($orig_post_id));
    if ($meta) {
        foreach ($meta as $m) {
            set_iconfig($orig_post_id, $m['cat'], $m['k'], $m['v'], $m['sharing']);
        }
        $arr['iconfig'] = $meta;
    }
    $ret['item'] = $arr;
    call_hooks('post_remote_update_end', $arr);
    if ($deliver) {
        send_status_notifications($orig_post_id, $arr);
        tag_deliver($uid, $orig_post_id);
    }
    $ret['success'] = true;
    $ret['item_id'] = $orig_post_id;
    return $ret;
}

//.........这里部分代码省略.........
    $arr['attach'] = x($arr, 'attach') ? notags(trim($arr['attach'])) : '';
    $arr['app'] = x($arr, 'app') ? notags(trim($arr['app'])) : '';
    $arr['origin'] = x($arr, 'origin') ? intval($arr['origin']) : 0;
    $arr['guid'] = x($arr, 'guid') ? notags(trim($arr['guid'])) : get_guid();
    if ($arr['parent-uri'] === $arr['uri']) {
        $parent_id = 0;
        $parent_deleted = 0;
        $allow_cid = $arr['allow_cid'];
        $allow_gid = $arr['allow_gid'];
        $deny_cid = $arr['deny_cid'];
        $deny_gid = $arr['deny_gid'];
    } else {
        // find the parent and snarf the item id and ACL's
        // and anything else we need to inherit
        $r = q("SELECT * FROM `item` WHERE `uri` = '%s' AND `uid` = %d ORDER BY `id` ASC LIMIT 1", dbesc($arr['parent-uri']), intval($arr['uid']));
        if (count($r)) {
            // is the new message multi-level threaded?
            // even though we don't support it now, preserve the info
            // and re-attach to the conversation parent.
            if ($r[0]['uri'] != $r[0]['parent-uri']) {
                $arr['thr-parent'] = $arr['parent-uri'];
                $arr['parent-uri'] = $r[0]['parent-uri'];
                $z = q("SELECT `id` FROM `item` WHERE `uri` = '%s' AND `parent-uri` = '%s' AND `uid` = %d \n\t\t\t\t\tORDER BY `id` ASC LIMIT 1", dbesc($r[0]['parent-uri']), dbesc($r[0]['parent-uri']), intval($arr['uid']));
                if ($z && count($z)) {
                    $r = $z;
                }
            }
            $parent_id = $r[0]['id'];
            $parent_deleted = $r[0]['deleted'];
            $allow_cid = $r[0]['allow_cid'];
            $allow_gid = $r[0]['allow_gid'];
            $deny_cid = $r[0]['deny_cid'];
            $deny_gid = $r[0]['deny_gid'];
            $arr['wall'] = $r[0]['wall'];
        } else {
            // Allow one to see reply tweets from status.net even when
            // we don't have or can't see the original post.
            if ($force_parent) {
                logger('item_store: $force_parent=true, reply converted to top-level post.');
                $parent_id = 0;
                $arr['thr-parent'] = $arr['parent-uri'];
                $arr['parent-uri'] = $arr['uri'];
                $arr['gravity'] = 0;
            } else {
                logger('item_store: item parent was not found - ignoring item');
                return 0;
            }
            $parent_deleted = 0;
        }
    }
    $r = q("SELECT `id` FROM `item` WHERE `uri` = '%s' AND `uid` = %d LIMIT 1", dbesc($arr['uri']), intval($arr['uid']));
    if ($r && count($r)) {
        logger('item-store: duplicate item ignored. ' . print_r($arr, true));
        return 0;
    }
    call_hooks('post_remote', $arr);
    if (x($arr, 'cancel')) {
        logger('item_store: post cancelled by plugin.');
        return 0;
    }
    dbesc_array($arr);
    logger('item_store: ' . print_r($arr, true), LOGGER_DATA);
    $r = dbq("INSERT INTO `item` (`" . implode("`, `", array_keys($arr)) . "`) VALUES ('" . implode("', '", array_values($arr)) . "')");
    // find the item we just created
    $r = q("SELECT `id` FROM `item` WHERE `uri` = '%s' AND `uid` = %d ORDER BY `id` ASC ", $arr['uri'], intval($arr['uid']));
    if (count($r)) {
        $current_post = $r[0]['id'];
        logger('item_store: created item ' . $current_post);
    } else {
        logger('item_store: could not locate created item');
        return 0;
    }
    if (count($r) > 1) {
        logger('item_store: duplicated post occurred. Removing duplicates.');
        q("DELETE FROM `item` WHERE `uri` = '%s' AND `uid` = %d AND `id` != %d ", $arr['uri'], intval($arr['uid']), intval($current_post));
    }
    if (!$parent_id || $arr['parent-uri'] === $arr['uri']) {
        $parent_id = $current_post;
    }
    if (strlen($allow_cid) || strlen($allow_gid) || strlen($deny_cid) || strlen($deny_gid)) {
        $private = 1;
    } else {
        $private = $arr['private'];
    }
    // Set parent id - and also make sure to inherit the parent's ACL's.
    $r = q("UPDATE `item` SET `parent` = %d, `allow_cid` = '%s', `allow_gid` = '%s',\n\t\t`deny_cid` = '%s', `deny_gid` = '%s', `private` = %d, `deleted` = %d WHERE `id` = %d LIMIT 1", intval($parent_id), dbesc($allow_cid), dbesc($allow_gid), dbesc($deny_cid), dbesc($deny_gid), intval($private), intval($parent_deleted), intval($current_post));
    // update the commented timestamp on the parent
    q("UPDATE `item` set `commented` = '%s', `changed` = '%s' WHERE `id` = %d LIMIT 1", dbesc(datetime_convert()), dbesc(datetime_convert()), intval($parent_id));
    if ($dsprsig) {
        q("insert into sign (`iid`,`signed_text`,`signature`,`signer`) values (%d,'%s','%s','%s') ", intval($current_post), dbesc($dsprsig->signed_text), dbesc($dsprsig->signature), dbesc($dsprsig->signer));
    }
    /**
     * If this is now the last-child, force all _other_ children of this parent to *not* be last-child
     */
    if ($arr['last-child']) {
        $r = q("UPDATE `item` SET `last-child` = 0 WHERE `parent-uri` = '%s' AND `uid` = %d AND `id` != %d", dbesc($arr['uri']), intval($arr['uid']), intval($current_post));
    }
    tag_deliver($arr['uid'], $current_post);
    return $current_post;
}

//.........这里部分代码省略.........
            // The original author commented, but as this is a comment, the permissions
            // weren't fixed up so it will still show the comment as private unless we fix it here.
            if (intval($r[0]['forum_mode']) == 1 && !$r[0]['private']) {
                $arr['private'] = 0;
            }
        } else {
            // Allow one to see reply tweets from status.net even when
            // we don't have or can't see the original post.
            if ($force_parent) {
                logger('item_store: $force_parent=true, reply converted to top-level post.');
                $parent_id = 0;
                $arr['parent-uri'] = $arr['uri'];
                $arr['gravity'] = 0;
            } else {
                logger('item_store: item parent was not found - ignoring item');
                return 0;
            }
            $parent_deleted = 0;
        }
    }
    $r = q("SELECT `id` FROM `item` WHERE `uri` = '%s' AND `uid` = %d LIMIT 1", dbesc($arr['uri']), intval($arr['uid']));
    if ($r && count($r)) {
        logger('item-store: duplicate item ignored. ' . print_r($arr, true));
        return 0;
    }
    call_hooks('post_remote', $arr);
    if (x($arr, 'cancel')) {
        logger('item_store: post cancelled by plugin.');
        return 0;
    }
    dbesc_array($arr);
    logger('item_store: ' . print_r($arr, true), LOGGER_DATA);
    $r = dbq("INSERT INTO `item` (`" . implode("`, `", array_keys($arr)) . "`) VALUES ('" . implode("', '", array_values($arr)) . "')");
    // find the item we just created
    $r = q("SELECT `id` FROM `item` WHERE `uri` = '%s' AND `uid` = %d ORDER BY `id` ASC ", $arr['uri'], intval($arr['uid']));
    if (count($r)) {
        $current_post = $r[0]['id'];
        logger('item_store: created item ' . $current_post);
        create_tags_from_item($r[0]['id']);
    } else {
        logger('item_store: could not locate created item');
        return 0;
    }
    if (count($r) > 1) {
        logger('item_store: duplicated post occurred. Removing duplicates.');
        q("DELETE FROM `item` WHERE `uri` = '%s' AND `uid` = %d AND `id` != %d ", $arr['uri'], intval($arr['uid']), intval($current_post));
    }
    if (!$parent_id || $arr['parent-uri'] === $arr['uri']) {
        $parent_id = $current_post;
    }
    if (strlen($allow_cid) || strlen($allow_gid) || strlen($deny_cid) || strlen($deny_gid)) {
        $private = 1;
    } else {
        $private = $arr['private'];
    }
    // Set parent id - and also make sure to inherit the parent's ACL's.
    $r = q("UPDATE `item` SET `parent` = %d, `allow_cid` = '%s', `allow_gid` = '%s',\n\t\t`deny_cid` = '%s', `deny_gid` = '%s', `private` = %d, `deleted` = %d WHERE `id` = %d LIMIT 1", intval($parent_id), dbesc($allow_cid), dbesc($allow_gid), dbesc($deny_cid), dbesc($deny_gid), intval($private), intval($parent_deleted), intval($current_post));
    create_tags_from_item($current_post);
    // Complete ostatus threads
    if ($ostatus_conversation) {
        complete_conversation($current_post, $ostatus_conversation);
    }
    $arr['id'] = $current_post;
    $arr['parent'] = $parent_id;
    $arr['allow_cid'] = $allow_cid;
    $arr['allow_gid'] = $allow_gid;
    $arr['deny_cid'] = $deny_cid;
    $arr['deny_gid'] = $deny_gid;
    $arr['private'] = $private;
    $arr['deleted'] = $parent_deleted;
    // update the commented timestamp on the parent
    q("UPDATE `item` set `commented` = '%s', `changed` = '%s' WHERE `id` = %d LIMIT 1", dbesc(datetime_convert()), dbesc(datetime_convert()), intval($parent_id));
    if ($dsprsig) {
        q("insert into sign (`iid`,`signed_text`,`signature`,`signer`) values (%d,'%s','%s','%s') ", intval($current_post), dbesc($dsprsig->signed_text), dbesc($dsprsig->signature), dbesc($dsprsig->signer));
    }
    /**
     * If this is now the last-child, force all _other_ children of this parent to *not* be last-child
     */
    if ($arr['last-child']) {
        $r = q("UPDATE `item` SET `last-child` = 0 WHERE `parent-uri` = '%s' AND `uid` = %d AND `id` != %d", dbesc($arr['uri']), intval($arr['uid']), intval($current_post));
    }
    tag_deliver($arr['uid'], $current_post);
    // Store the fresh generated item into the cache
    $cachefile = get_cachefile($arr["guid"] . "-" . hash("md5", $arr['body']));
    if ($cachefile != '' and !file_exists($cachefile)) {
        $s = prepare_text($arr['body']);
        $a = get_app();
        $stamp1 = microtime(true);
        file_put_contents($cachefile, $s);
        $a->save_timestamp($stamp1, "file");
        logger('item_store: put item ' . $current_post . ' into cachefile ' . $cachefile);
    }
    $r = q('SELECT * FROM `item` WHERE id = %d', intval($current_post));
    if (count($r) == 1) {
        call_hooks('post_remote_end', $r[0]);
    } else {
        logger('item_store: new item not found in DB, id ' . $current_post);
    }
    return $current_post;
}

//.........这里部分代码省略.........
    }
    call_hooks('post_remote', $arr);
    if (x($arr, 'cancel')) {
        logger('item_store: post cancelled by plugin.');
        return 0;
    }
    dbesc_array($arr);
    logger('item_store: ' . print_r($arr, true), LOGGER_DATA);
    $r = dbq("INSERT INTO `item` (`" . implode("`, `", array_keys($arr)) . "`) VALUES ('" . implode("', '", array_values($arr)) . "')");
    // find the item we just created
    $r = q("SELECT `id` FROM `item` WHERE `uri` = '%s' AND `uid` = %d ORDER BY `id` ASC ", $arr['uri'], intval($arr['uid']));
    if (count($r)) {
        $current_post = $r[0]['id'];
        logger('item_store: created item ' . $current_post);
        // Only check for notifications on start posts
        if ($arr['parent-uri'] === $arr['uri']) {
            add_thread($r[0]['id']);
            logger('item_store: Check notification for contact ' . $arr['contact-id'] . ' and post ' . $current_post, LOGGER_DEBUG);
            // Send a notification for every new post?
            $r = q("SELECT `notify_new_posts` FROM `contact` WHERE `id` = %d AND `uid` = %d AND `notify_new_posts` LIMIT 1", intval($arr['contact-id']), intval($arr['uid']));
            if (count($r)) {
                logger('item_store: Send notification for contact ' . $arr['contact-id'] . ' and post ' . $current_post, LOGGER_DEBUG);
                $u = q("SELECT * FROM user WHERE uid = %d LIMIT 1", intval($arr['uid']));
                $item = q("SELECT * FROM `item` WHERE `id` = %d AND `uid` = %d", intval($current_post), intval($arr['uid']));
                $a = get_app();
                require_once 'include/enotify.php';
                notification(array('type' => NOTIFY_SHARE, 'notify_flags' => $u[0]['notify-flags'], 'language' => $u[0]['language'], 'to_name' => $u[0]['username'], 'to_email' => $u[0]['email'], 'uid' => $u[0]['uid'], 'item' => $item[0], 'link' => $a->get_baseurl() . '/display/' . urlencode($arr['guid']), 'source_name' => $item[0]['author-name'], 'source_link' => $item[0]['author-link'], 'source_photo' => $item[0]['author-avatar'], 'verb' => ACTIVITY_TAG, 'otype' => 'item'));
                logger('item_store: Notification sent for contact ' . $arr['contact-id'] . ' and post ' . $current_post, LOGGER_DEBUG);
            }
        }
    } else {
        logger('item_store: could not locate created item');
        return 0;
    }
    if (count($r) > 1) {
        logger('item_store: duplicated post occurred. Removing duplicates.');
        q("DELETE FROM `item` WHERE `uri` = '%s' AND `uid` = %d AND `id` != %d ", $arr['uri'], intval($arr['uid']), intval($current_post));
    }
    if (!$parent_id || $arr['parent-uri'] === $arr['uri']) {
        $parent_id = $current_post;
    }
    if (strlen($allow_cid) || strlen($allow_gid) || strlen($deny_cid) || strlen($deny_gid)) {
        $private = 1;
    } else {
        $private = $arr['private'];
    }
    // Set parent id - and also make sure to inherit the parent's ACLs.
    $r = q("UPDATE `item` SET `parent` = %d, `allow_cid` = '%s', `allow_gid` = '%s',\n\t\t`deny_cid` = '%s', `deny_gid` = '%s', `private` = %d, `deleted` = %d WHERE `id` = %d", intval($parent_id), dbesc($allow_cid), dbesc($allow_gid), dbesc($deny_cid), dbesc($deny_gid), intval($private), intval($parent_deleted), intval($current_post));
    // Complete ostatus threads
    if ($ostatus_conversation) {
        complete_conversation($current_post, $ostatus_conversation);
    }
    $arr['id'] = $current_post;
    $arr['parent'] = $parent_id;
    $arr['allow_cid'] = $allow_cid;
    $arr['allow_gid'] = $allow_gid;
    $arr['deny_cid'] = $deny_cid;
    $arr['deny_gid'] = $deny_gid;
    $arr['private'] = $private;
    $arr['deleted'] = $parent_deleted;
    // update the commented timestamp on the parent
    q("UPDATE `item` set `commented` = '%s', `changed` = '%s' WHERE `id` = %d", dbesc(datetime_convert()), dbesc(datetime_convert()), intval($parent_id));
    update_thread($parent_id);
    if ($dsprsig) {
        q("insert into sign (`iid`,`signed_text`,`signature`,`signer`) values (%d,'%s','%s','%s') ", intval($current_post), dbesc($dsprsig->signed_text), dbesc($dsprsig->signature), dbesc($dsprsig->signer));
    }
    /**
     * If this is now the last-child, force all _other_ children of this parent to *not* be last-child
     */
    if ($arr['last-child']) {
        $r = q("UPDATE `item` SET `last-child` = 0 WHERE `parent-uri` = '%s' AND `uid` = %d AND `id` != %d", dbesc($arr['uri']), intval($arr['uid']), intval($current_post));
    }
    $deleted = tag_deliver($arr['uid'], $current_post);
    // current post can be deleted if is for a communuty page and no mention are
    // in it.
    if (!$deleted) {
        // Store the fresh generated item into the cache
        $cachefile = get_cachefile($arr["guid"] . "-" . hash("md5", $arr['body']));
        if ($cachefile != '' and !file_exists($cachefile)) {
            $s = prepare_text($arr['body']);
            $a = get_app();
            $stamp1 = microtime(true);
            file_put_contents($cachefile, $s);
            $a->save_timestamp($stamp1, "file");
            logger('item_store: put item ' . $current_post . ' into cachefile ' . $cachefile);
        }
        $r = q('SELECT * FROM `item` WHERE id = %d', intval($current_post));
        if (count($r) == 1) {
            call_hooks('post_remote_end', $r[0]);
        } else {
            logger('item_store: new item not found in DB, id ' . $current_post);
        }
    }
    create_tags_from_item($current_post);
    create_files_from_item($current_post);
    if ($notify) {
        proc_run('php', "include/notifier.php", $notify_type, $current_post);
    }
    return $current_post;
}

function delete_imported_item($sender, $item, $uid)
{
    logger('delete_imported_item invoked', LOGGER_DEBUG);
    $r = q("select id, item_restrict from item where ( author_xchan = '%s' or owner_xchan = '%s' or source_xchan = '%s' )\n\t\tand mid = '%s' and uid = %d limit 1", dbesc($sender['hash']), dbesc($sender['hash']), dbesc($sender['hash']), dbesc($item['mid']), intval($uid));
    if (!$r) {
        logger('delete_imported_item: failed: ownership issue');
        return false;
    }
    if ($r[0]['item_restrict'] & ITEM_DELETED) {
        logger('delete_imported_item: item was already deleted');
        return false;
    }
    require_once 'include/items.php';
    // Use phased deletion to set the deleted flag, call both tag_deliver and the notifier to notify downstream channels
    // and then clean up after ourselves with a cron job after several days to do the delete_item_lowlevel() (DROPITEM_PHASE2).
    drop_item($r[0]['id'], false, DROPITEM_PHASE1);
    tag_deliver($uid, $r[0]['id']);
    return $r[0]['id'];
}