]> git.mxchange.org Git - friendica.git/blobdiff - mod/display.php
Fix for not being able to delete items
[friendica.git] / mod / display.php
index 570582343afb9156c239c881d0f944302b238ed2..80e913d204beacb73be0e56a929755bf04650172 100644 (file)
@@ -1,19 +1,30 @@
 <?php
+/**
+ * @file mod/display.php
+ */
 
 use Friendica\App;
+use Friendica\Content\Text\BBCode;
+use Friendica\Content\Text\HTML;
+use Friendica\Core\ACL;
 use Friendica\Core\Config;
+use Friendica\Core\L10n;
+use Friendica\Core\Protocol;
 use Friendica\Core\System;
 use Friendica\Database\DBM;
+use Friendica\Model\Contact;
+use Friendica\Model\Group;
+use Friendica\Model\Profile;
 use Friendica\Protocol\DFRN;
 
-function display_init(App $a) {
-
-       if ((Config::get('system','block_public')) && (! local_user()) && (! remote_user())) {
+function display_init(App $a)
+{
+       if (Config::get('system', 'block_public') && !local_user() && !remote_user()) {
                return;
        }
 
        $nick = (($a->argc > 1) ? $a->argv[1] : '');
-       $profiledata = array();
+       $profiledata = [];
 
        if ($a->argc == 3) {
                if (substr($a->argv[2], -5) == '.atom') {
@@ -29,10 +40,11 @@ function display_init(App $a) {
                }
        }
 
+       $r = false;
+
        // If there is only one parameter, then check if this parameter could be a guid
        if ($a->argc == 2) {
                $nick = "";
-               $itemuid = 0;
                $r = false;
 
                // Does the local user have this item?
@@ -43,7 +55,6 @@ function display_init(App $a) {
                                        AND `guid` = ? AND `uid` = ? LIMIT 1", $a->argv[1], local_user());
                        if (DBM::is_result($r)) {
                                $nick = $a->user["nickname"];
-                               $itemuid = local_user();
                        }
                }
 
@@ -52,71 +63,61 @@ function display_init(App $a) {
                        $r = dba::fetch_first("SELECT `id`, `parent`, `author-name`, `author-link`,
                                                `author-avatar`, `network`, `body`, `uid`, `owner-link`
                                FROM `item` WHERE `visible` AND NOT `deleted` AND NOT `moderated`
-                                       AND `allow_cid` = ''  AND `allow_gid` = ''
-                                       AND `deny_cid`  = '' AND `deny_gid`  = ''
                                        AND NOT `private` AND `uid` = 0
                                        AND `guid` = ? LIMIT 1", $a->argv[1]);
                }
 
-               // Or is it anywhere on the server?
                if (!DBM::is_result($r)) {
-                       $r = dba::fetch_first("SELECT `item`.`id`, `item`.`parent`, `item`.`author-name`, `item`.`author-link`,
-                               `item`.`author-avatar`, `item`.`network`, `item`.`body`, `item`.`uid`, `item`.`owner-link`
-                               FROM `item` STRAIGHT_JOIN `user` ON `user`.`uid` = `item`.`uid`
-                               WHERE `item`.`visible` AND NOT `item`.`deleted` AND NOT `item`.`moderated`
-                                       AND `item`.`allow_cid` = ''  AND `item`.`allow_gid` = ''
-                                       AND `item`.`deny_cid`  = '' AND `item`.`deny_gid`  = ''
-                                       AND NOT `item`.`private` AND NOT `user`.`hidewall`
-                                       AND `item`.`guid` = ? LIMIT 1", $a->argv[1]);
+                       $a->error = 404;
+                       notice(L10n::t('Item not found.') . EOL);
+                       return;
                }
+       } elseif (($a->argc == 3) && ($nick == 'feed-item')) {
+               $r = dba::fetch_first("SELECT `id`, `parent`, `author-name`, `author-link`,
+                                       `author-avatar`, `network`, `body`, `uid`, `owner-link`
+                       FROM `item` WHERE `visible` AND NOT `deleted` AND NOT `moderated`
+                               AND NOT `private` AND `uid` = 0
+                               AND `id` = ? LIMIT 1", $a->argv[2]);
+       }
 
-               if (DBM::is_result($r)) {
+       if (DBM::is_result($r)) {
+               if (strstr($_SERVER['HTTP_ACCEPT'], 'application/atom+xml')) {
+                       logger('Directly serving XML for id '.$r["id"], LOGGER_DEBUG);
+                       displayShowFeed($r["id"], false);
+               }
 
-                       if (strstr($_SERVER['HTTP_ACCEPT'], 'application/atom+xml')) {
-                               logger('Directly serving XML for id '.$r["id"], LOGGER_DEBUG);
-                               displayShowFeed($r["id"], false);
-                       }
+               if ($r["id"] != $r["parent"]) {
+                       $r = dba::fetch_first("SELECT `id`, `author-name`, `author-link`, `author-avatar`, `network`, `body`, `uid`, `owner-link` FROM `item`
+                               WHERE `item`.`visible` AND NOT `item`.`deleted` AND NOT `item`.`moderated`
+                                       AND `id` = ?", $r["parent"]);
+               }
 
-                       if ($r["id"] != $r["parent"]) {
-                               $r = dba::fetch_first("SELECT `id`, `author-name`, `author-link`, `author-avatar`, `network`, `body`, `uid`, `owner-link` FROM `item`
-                                       WHERE `item`.`visible` AND NOT `item`.`deleted` AND NOT `item`.`moderated`
-                                               AND `id` = ?", $r["parent"]);
-                       }
+               $profiledata = display_fetchauthor($a, $r);
 
-                       $profiledata = display_fetchauthor($a, $r);
-
-                       if (strstr(normalise_link($profiledata["url"]), normalise_link(System::baseUrl()))) {
-                               $nickname = str_replace(normalise_link(System::baseUrl())."/profile/", "", normalise_link($profiledata["url"]));
-
-                               if (($nickname != $a->user["nickname"])) {
-                                       $r = dba::fetch_first("SELECT `profile`.`uid` AS `profile_uid`, `profile`.* , `contact`.`avatar-date` AS picdate, `user`.* FROM `profile`
-                                               INNER JOIN `contact` on `contact`.`uid` = `profile`.`uid` INNER JOIN `user` ON `profile`.`uid` = `user`.`uid`
-                                               WHERE `user`.`nickname` = ? AND `profile`.`is-default` AND `contact`.`self` LIMIT 1",
-                                               $nickname
-                                       );
-                                       if (DBM::is_result($r)) {
-                                               $profiledata = $r;
-                                       }
-                                       $profiledata["network"] = NETWORK_DFRN;
-                               } else {
-                                       $profiledata = array();
+               if (strstr(normalise_link($profiledata["url"]), normalise_link(System::baseUrl()))) {
+                       $nickname = str_replace(normalise_link(System::baseUrl())."/profile/", "", normalise_link($profiledata["url"]));
+
+                       if (($nickname != $a->user["nickname"])) {
+                               $r = dba::fetch_first("SELECT `profile`.`uid` AS `profile_uid`, `profile`.* , `contact`.`avatar-date` AS picdate, `user`.* FROM `profile`
+                                       INNER JOIN `contact` on `contact`.`uid` = `profile`.`uid` INNER JOIN `user` ON `profile`.`uid` = `user`.`uid`
+                                       WHERE `user`.`nickname` = ? AND `profile`.`is-default` AND `contact`.`self` LIMIT 1",
+                                       $nickname
+                               );
+                               if (DBM::is_result($r)) {
+                                       $profiledata = $r;
                                }
+                               $profiledata["network"] = NETWORK_DFRN;
+                       } else {
+                               $profiledata = [];
                        }
-               } else {
-                       $a->error = 404;
-                       notice(t('Item not found.') . EOL);
-                       return;
                }
        }
 
-       profile_load($a, $nick, 0, $profiledata);
+       Profile::load($a, $nick, 0, $profiledata);
 }
 
 function display_fetchauthor($a, $item) {
-
-       require_once("include/Contact.php");
-
-       $profiledata = array();
+       $profiledata = [];
        $profiledata["uid"] = -1;
        $profiledata["nickname"] = $item["author-name"];
        $profiledata["name"] = $item["author-name"];
@@ -175,18 +176,18 @@ function display_fetchauthor($a, $item) {
                        $profiledata["photo"] = $matches[1];
                }
                $profiledata["nickname"] = $profiledata["name"];
-               $profiledata["network"] = GetProfileUsername($profiledata["url"], "", false, true);
+               $profiledata["network"] = Protocol::matchByProfileUrl($profiledata["url"]);
 
                $profiledata["address"] = "";
                $profiledata["about"] = "";
        }
 
-       $profiledata = get_contact_details_by_url($profiledata["url"], local_user(), $profiledata);
+       $profiledata = Contact::getDetailsByURL($profiledata["url"], local_user(), $profiledata);
 
        $profiledata["photo"] = System::removedBaseUrl($profiledata["photo"]);
 
        if (local_user()) {
-               if (in_array($profiledata["network"], array(NETWORK_DFRN, NETWORK_DIASPORA, NETWORK_OSTATUS))) {
+               if (in_array($profiledata["network"], [NETWORK_DFRN, NETWORK_DIASPORA, NETWORK_OSTATUS])) {
                        $profiledata["remoteconnect"] = System::baseUrl()."/follow?url=".urlencode($profiledata["url"]);
                }
        } elseif ($profiledata["network"] == NETWORK_DFRN) {
@@ -197,112 +198,87 @@ function display_fetchauthor($a, $item) {
        return($profiledata);
 }
 
-function display_content(App $a, $update = 0) {
-
-       if ((Config::get('system','block_public')) && (! local_user()) && (! remote_user())) {
-               notice(t('Public access denied.') . EOL);
+function display_content(App $a, $update = false, $update_uid = 0) {
+       if (Config::get('system','block_public') && !local_user() && !remote_user()) {
+               notice(L10n::t('Public access denied.') . EOL);
                return;
        }
 
-       require_once('include/security.php');
-       require_once('include/conversation.php');
-       require_once('include/acl_selectors.php');
-
+       require_once 'include/security.php';
+       require_once 'include/conversation.php';
 
        $o = '';
 
-       if ($update) {
-               $nick = $_REQUEST['nick'];
-       } else {
-               $nick = (($a->argc > 1) ? $a->argv[1] : '');
-       }
-
        if ($update) {
                $item_id = $_REQUEST['item_id'];
-               $a->profile = array('uid' => intval($update), 'profile_uid' => intval($update));
+               $item = dba::selectFirst('item', ['uid', 'parent', 'parent-uri'], ['id' => $item_id]);
+               if ($item['uid'] != 0) {
+                       $a->profile = ['uid' => intval($item['uid']), 'profile_uid' => intval($item['uid'])];
+               } else {
+                       $a->profile = ['uid' => intval($update_uid), 'profile_uid' => intval($update_uid)];
+               }
+               $item_parent = $item['parent'];
+               $item_parent_uri = $item['parent-uri'];
        } else {
                $item_id = (($a->argc > 2) ? $a->argv[2] : 0);
 
                if ($a->argc == 2) {
-                       $nick = "";
+                       $item_parent = 0;
 
                        if (local_user()) {
-                               $r = dba::fetch_first("SELECT `id`, `parent` FROM `item`
+                               $r = dba::fetch_first("SELECT `id`, `parent`, `parent-uri` FROM `item`
                                        WHERE `item`.`visible` AND NOT `item`.`deleted` AND NOT `item`.`moderated`
                                                AND `guid` = ? AND `uid` = ?", $a->argv[1], local_user());
                                if (DBM::is_result($r)) {
                                        $item_id = $r["id"];
                                        $item_parent = $r["parent"];
-                                       $nick = $a->user["nickname"];
+                                       $item_parent_uri = $r['parent-uri'];
                                }
                        }
 
-                       if ($nick == "") {
-                               $r = dba::fetch_first("SELECT `user`.`nickname`, `item`.`id`, `item`.`parent` FROM `item` STRAIGHT_JOIN `user` ON `user`.`uid` = `item`.`uid`
-                                       WHERE `item`.`visible` AND NOT `item`.`deleted` AND NOT `item`.`moderated`
-                                               AND `item`.`allow_cid` = ''  AND `item`.`allow_gid` = ''
-                                               AND `item`.`deny_cid`  = '' AND `item`.`deny_gid`  = ''
-                                               AND NOT `item`.`private` AND NOT `user`.`hidewall`
-                                               AND `item`.`guid` = ?", $a->argv[1]);
-                               if (DBM::is_result($r)) {
-                                       $item_id = $r["id"];
-                                       $item_parent = $r["parent"];
-                                       $nick = $r["nickname"];
-                               }
-                       }
-                       if ($nick == "") {
-                               $r = dba::fetch_first("SELECT `item`.`id`, `item`.`parent` FROM `item`
+                       if ($item_parent == 0) {
+                               $r = dba::fetch_first("SELECT `item`.`id`, `item`.`parent`, `item`.`parent-uri` FROM `item`
                                        WHERE `item`.`visible` AND NOT `item`.`deleted` AND NOT `item`.`moderated`
-                                               AND `item`.`allow_cid` = ''  AND `item`.`allow_gid` = ''
-                                               AND `item`.`deny_cid`  = '' AND `item`.`deny_gid`  = ''
                                                AND NOT `item`.`private` AND `item`.`uid` = 0
                                                AND `item`.`guid` = ?", $a->argv[1]);
                                if (DBM::is_result($r)) {
                                        $item_id = $r["id"];
                                        $item_parent = $r["parent"];
+                                       $item_parent_uri = $r['parent-uri'];
                                }
                        }
                }
        }
 
-       if ($item_id && !is_numeric($item_id)) {
-               $r = dba::select('item', array('id', 'parent'), array('uri' => $item_id, 'uid' => $a->profile['uid']), array('limit' => 1));
-               if (DBM::is_result($r)) {
-                       $item_id = $r["id"];
-                       $item_parent = $r["parent"];
-               } else {
-                       $item_id = false;
-               }
-       }
-
        if (!$item_id) {
                $a->error = 404;
-               notice(t('Item not found.').EOL);
+               notice(L10n::t('Item not found.').EOL);
                return;
        }
 
        // We are displaying an "alternate" link if that post was public. See issue 2864
-       $is_public = dba::exists('item', array('id' => $item_id, 'private' => false));
+       $is_public = dba::exists('item', ['id' => $item_id, 'private' => false]);
        if ($is_public) {
-               $alternate = System::baseUrl().'/display/'.$nick.'/'.$item_id.'.atom';
-               $conversation = System::baseUrl().'/display/'.$nick.'/'.$item_parent.'/conversation.atom';
+               // For the atom feed the nickname doesn't matter at all, we only need the item id.
+               $alternate = System::baseUrl().'/display/feed-item/'.$item_id.'.atom';
+               $conversation = System::baseUrl().'/display/feed-item/'.$item_parent.'/conversation.atom';
        } else {
                $alternate = '';
                $conversation = '';
        }
 
        $a->page['htmlhead'] .= replace_macros(get_markup_template('display-head.tpl'),
-                               array('$alternate' => $alternate,
-                                       '$conversation' => $conversation));
+                               ['$alternate' => $alternate,
+                                       '$conversation' => $conversation]);
 
-       $groups = array();
+       $groups = [];
 
        $contact = null;
        $remote_contact = false;
 
        $contact_id = 0;
 
-       if (is_array($_SESSION['remote'])) {
+       if (x($_SESSION, 'remote') && is_array($_SESSION['remote'])) {
                foreach ($_SESSION['remote'] as $v) {
                        if ($v['uid'] == $a->profile['uid']) {
                                $contact_id = $v['cid'];
@@ -312,7 +288,7 @@ function display_content(App $a, $update = 0) {
        }
 
        if ($contact_id) {
-               $groups = init_groups_visitor($contact_id);
+               $groups = Group::getIdsByContactId($contact_id);
                $r = dba::fetch_first("SELECT * FROM `contact` WHERE `id` = ? AND `uid` = ? LIMIT 1",
                        $contact_id,
                        $a->profile['uid']
@@ -334,167 +310,126 @@ function display_content(App $a, $update = 0) {
        if (DBM::is_result($r)) {
                $a->page_contact = $r;
        }
-       $is_owner = ((local_user()) && (local_user() == $a->profile['profile_uid']) ? true : false);
+       $is_owner = (local_user() && (in_array($a->profile['profile_uid'], [local_user(), 0])) ? true : false);
 
-       if ($a->profile['hidewall'] && (! $is_owner) && (! $remote_contact)) {
-               notice(t('Access to this profile has been restricted.') . EOL);
+       if (x($a->profile, 'hidewall') && !$is_owner && !$remote_contact) {
+               notice(L10n::t('Access to this profile has been restricted.') . EOL);
                return;
        }
 
        // We need the editor here to be able to reshare an item.
-
        if ($is_owner) {
-               $x = array(
+               $x = [
                        'is_owner' => true,
                        'allow_location' => $a->user['allow_location'],
                        'default_location' => $a->user['default-location'],
                        'nickname' => $a->user['nickname'],
-                       'lockstate' => ( (is_array($a->user)) && ((strlen($a->user['allow_cid'])) || (strlen($a->user['allow_gid'])) || (strlen($a->user['deny_cid'])) || (strlen($a->user['deny_gid']))) ? 'lock' : 'unlock'),
-                       'acl' => populate_acl($a->user, true),
+                       'lockstate' => (is_array($a->user) && (strlen($a->user['allow_cid']) || strlen($a->user['allow_gid']) || strlen($a->user['deny_cid']) || strlen($a->user['deny_gid'])) ? 'lock' : 'unlock'),
+                       'acl' => ACL::getFullSelectorHTML($a->user, true),
                        'bang' => '',
                        'visitor' => 'block',
                        'profile_uid' => local_user(),
-                       'acl_data' => construct_acl_data($a, $a->user), // For non-Javascript ACL selector
-               );
-               $o .= status_editor($a,$x,0,true);
+               ];
+               $o .= status_editor($a, $x, 0, true);
        }
 
-       $sql_extra = item_permissions_sql($a->profile['uid'],$remote_contact,$groups);
+       $sql_extra = item_permissions_sql($a->profile['uid'], $remote_contact, $groups);
 
-       if ($update) {
-               $r = dba::p("SELECT `id` FROM `item` WHERE `item`.`uid` = ?
-                       AND `item`.`parent` = (SELECT `parent` FROM `item` WHERE `id` = ?)
-                       $sql_extra AND `unseen`",
-                       $a->profile['uid'],
-                       $item_id
-               );
+       if (local_user() && (local_user() == $a->profile['uid'])) {
+               $condition = ['parent-uri' => $item_parent_uri, 'uid' => local_user(), 'unseen' => true];
+               $unseen = dba::exists('item', $condition);
+       } else {
+               $unseen = false;
+       }
 
-               if (dba::num_rows($r) == 0) {
-                       return '';
-               }
+       if ($update && !$unseen) {
+               return '';
        }
 
-       $r = dba::p(item_query()."AND `item`.`parent` = (SELECT `parent` FROM `item` WHERE `id` = ?)
-               $sql_extra
-               ORDER BY `parent` DESC, `gravity` ASC, `id` ASC",
-               $item_id
+       $r = dba::p(item_query(local_user())."AND `item`.`parent-uri` = (SELECT `parent-uri` FROM `item` WHERE `id` = ?)
+               AND `item`.`uid` IN (0, ?) $sql_extra
+               ORDER BY `item`.`uid` ASC, `parent` DESC, `gravity` ASC, `id` ASC",
+               $item_id, local_user()
        );
 
-       if (!DBM::is_result($r) && local_user()) {
-               // Check if this is another person's link to a post that we have
-               $r = dba::fetch_first("SELECT `item`.uri FROM `item`
-                       WHERE (`item`.`id` = ? OR `item`.`uri` = ?)
-                       LIMIT 1",
-                       $item_id,
-                       $item_id
-               );
-               if (DBM::is_result($r)) {
-                       $item_uri = $r['uri'];
-
-                       $r = dba::p(item_query()." AND `item`.`uid` = ?
-                               AND `item`.`parent` = (SELECT `parent` FROM `item` WHERE `uri` = ? AND uid = ?)
-                               ORDER BY `parent` DESC, `gravity` ASC, `id` ASC",
-                               local_user(),
-                               $item_uri,
-                               local_user()
-                       );
-               }
+       if (!DBM::is_result($r)) {
+               notice(L10n::t('Item not found.') . EOL);
+               return $o;
        }
 
-       if (DBM::is_result($r)) {
-               $s = dba::inArray($r);
+       $s = dba::inArray($r);
 
-               if ((local_user()) && (local_user() == $a->profile['uid'])) {
-                       $unseen = dba::select('item', array('id'), array('parent' => $s[0]['parent'], 'unseen' => true), array('limit' => 1));
-                       if (DBM::is_result($unseen)) {
-                               dba::update('item', array('unseen' => false), array('parent' => $s[0]['parent'], 'unseen' => true));
-                       }
-               }
-
-               $items = conv_sort($s, "`commented`");
-
-               if (!$update) {
-                       $o .= "<script> var netargs = '?f=&nick=" . $nick . "&item_id=" . $item_id . "'; </script>";
-               }
-               $o .= conversation($a, $items, 'display', $update);
-
-               // Preparing the meta header
-               require_once('include/bbcode.php');
-               require_once("include/html2plain.php");
-               $description = trim(html2plain(bbcode($s[0]["body"], false, false), 0, true));
-               $title = trim(html2plain(bbcode($s[0]["title"], false, false), 0, true));
-               $author_name = $s[0]["author-name"];
+       if ($unseen) {
+               $condition = ['parent-uri' => $item_parent_uri, 'uid' => local_user(), 'unseen' => true];
+               dba::update('item', ['unseen' => false], $condition);
+       }
 
-               $image = $a->remove_baseurl($s[0]["author-thumb"]);
+       $items = conv_sort($s, "`commented`");
 
-               if ($title == "") {
-                       $title = $author_name;
-               }
+       if (!$update) {
+               $o .= "<script> var netargs = '?f=&item_id=" . $item_id . "'; </script>";
+       }
+       $o .= conversation($a, $items, 'display', $update_uid);
 
-               // Limit the description to 160 characters
-               if (strlen($description) > 160) {
-                       $description = substr($description, 0, 157) . '...';
-               }
+       // Preparing the meta header
+       $description = trim(HTML::toPlaintext(BBCode::convert($s[0]["body"], false), 0, true));
+       $title = trim(HTML::toPlaintext(BBCode::convert($s[0]["title"], false), 0, true));
+       $author_name = $s[0]["author-name"];
 
-               $description = htmlspecialchars($description, ENT_COMPAT, 'UTF-8', true); // allow double encoding here
-               $title = htmlspecialchars($title, ENT_COMPAT, 'UTF-8', true); // allow double encoding here
-               $author_name = htmlspecialchars($author_name, ENT_COMPAT, 'UTF-8', true); // allow double encoding here
-
-               //<meta name="keywords" content="">
-               $a->page['htmlhead'] .= '<meta name="author" content="'.$author_name.'" />'."\n";
-               $a->page['htmlhead'] .= '<meta name="title" content="'.$title.'" />'."\n";
-               $a->page['htmlhead'] .= '<meta name="fulltitle" content="'.$title.'" />'."\n";
-               $a->page['htmlhead'] .= '<meta name="description" content="'.$description.'" />'."\n";
-
-               // Schema.org microdata
-               $a->page['htmlhead'] .= '<meta itemprop="name" content="'.$title.'" />'."\n";
-               $a->page['htmlhead'] .= '<meta itemprop="description" content="'.$description.'" />'."\n";
-               $a->page['htmlhead'] .= '<meta itemprop="image" content="'.$image.'" />'."\n";
-               $a->page['htmlhead'] .= '<meta itemprop="author" content="'.$author_name.'" />'."\n";
-
-               // Twitter cards
-               $a->page['htmlhead'] .= '<meta name="twitter:card" content="summary" />'."\n";
-               $a->page['htmlhead'] .= '<meta name="twitter:title" content="'.$title.'" />'."\n";
-               $a->page['htmlhead'] .= '<meta name="twitter:description" content="'.$description.'" />'."\n";
-               $a->page['htmlhead'] .= '<meta name="twitter:image" content="'.System::baseUrl().'/'.$image.'" />'."\n";
-               $a->page['htmlhead'] .= '<meta name="twitter:url" content="'.$s[0]["plink"].'" />'."\n";
-
-               // Dublin Core
-               $a->page['htmlhead'] .= '<meta name="DC.title" content="'.$title.'" />'."\n";
-               $a->page['htmlhead'] .= '<meta name="DC.description" content="'.$description.'" />'."\n";
-
-               // Open Graph
-               $a->page['htmlhead'] .= '<meta property="og:type" content="website" />'."\n";
-               $a->page['htmlhead'] .= '<meta property="og:title" content="'.$title.'" />'."\n";
-               $a->page['htmlhead'] .= '<meta property="og:image" content="'.System::baseUrl().'/'.$image.'" />'."\n";
-               $a->page['htmlhead'] .= '<meta property="og:url" content="'.$s[0]["plink"].'" />'."\n";
-               $a->page['htmlhead'] .= '<meta property="og:description" content="'.$description.'" />'."\n";
-               $a->page['htmlhead'] .= '<meta name="og:article:author" content="'.$author_name.'" />'."\n";
-               // article:tag
+       $image = $a->remove_baseurl($s[0]["author-thumb"]);
 
-               return $o;
+       if ($title == "") {
+               $title = $author_name;
        }
-       $r = dba::fetch_first("SELECT `id`,`deleted` FROM `item` WHERE `id` = ? OR `uri` = ? LIMIT 1",
-               $item_id,
-               $item_id
-       );
-       if (DBM::is_result($r)) {
-               if ($r['deleted']) {
-                       notice(t('Item has been removed.') . EOL);
-               } else {
-                       notice(t('Permission denied.') . EOL);
-               }
-       } else {
-               notice(t('Item not found.') . EOL);
+
+       // Limit the description to 160 characters
+       if (strlen($description) > 160) {
+               $description = substr($description, 0, 157) . '...';
        }
 
+       $description = htmlspecialchars($description, ENT_COMPAT, 'UTF-8', true); // allow double encoding here
+       $title = htmlspecialchars($title, ENT_COMPAT, 'UTF-8', true); // allow double encoding here
+       $author_name = htmlspecialchars($author_name, ENT_COMPAT, 'UTF-8', true); // allow double encoding here
+
+       //<meta name="keywords" content="">
+       $a->page['htmlhead'] .= '<meta name="author" content="'.$author_name.'" />'."\n";
+       $a->page['htmlhead'] .= '<meta name="title" content="'.$title.'" />'."\n";
+       $a->page['htmlhead'] .= '<meta name="fulltitle" content="'.$title.'" />'."\n";
+       $a->page['htmlhead'] .= '<meta name="description" content="'.$description.'" />'."\n";
+
+       // Schema.org microdata
+       $a->page['htmlhead'] .= '<meta itemprop="name" content="'.$title.'" />'."\n";
+       $a->page['htmlhead'] .= '<meta itemprop="description" content="'.$description.'" />'."\n";
+       $a->page['htmlhead'] .= '<meta itemprop="image" content="'.$image.'" />'."\n";
+       $a->page['htmlhead'] .= '<meta itemprop="author" content="'.$author_name.'" />'."\n";
+
+       // Twitter cards
+       $a->page['htmlhead'] .= '<meta name="twitter:card" content="summary" />'."\n";
+       $a->page['htmlhead'] .= '<meta name="twitter:title" content="'.$title.'" />'."\n";
+       $a->page['htmlhead'] .= '<meta name="twitter:description" content="'.$description.'" />'."\n";
+       $a->page['htmlhead'] .= '<meta name="twitter:image" content="'.System::baseUrl().'/'.$image.'" />'."\n";
+       $a->page['htmlhead'] .= '<meta name="twitter:url" content="'.$s[0]["plink"].'" />'."\n";
+
+       // Dublin Core
+       $a->page['htmlhead'] .= '<meta name="DC.title" content="'.$title.'" />'."\n";
+       $a->page['htmlhead'] .= '<meta name="DC.description" content="'.$description.'" />'."\n";
+
+       // Open Graph
+       $a->page['htmlhead'] .= '<meta property="og:type" content="website" />'."\n";
+       $a->page['htmlhead'] .= '<meta property="og:title" content="'.$title.'" />'."\n";
+       $a->page['htmlhead'] .= '<meta property="og:image" content="'.System::baseUrl().'/'.$image.'" />'."\n";
+       $a->page['htmlhead'] .= '<meta property="og:url" content="'.$s[0]["plink"].'" />'."\n";
+       $a->page['htmlhead'] .= '<meta property="og:description" content="'.$description.'" />'."\n";
+       $a->page['htmlhead'] .= '<meta name="og:article:author" content="'.$author_name.'" />'."\n";
+       // article:tag
+
        return $o;
 }
 
 function displayShowFeed($item_id, $conversation) {
        $xml = DFRN::itemFeed($item_id, $conversation);
        if ($xml == '') {
-               http_status_exit(500);
+               System::httpExit(500);
        }
        header("Content-type: application/atom+xml");
        echo $xml;