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+<?php
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+
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+/**
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+ * This file contains liking posts and displaying the list of who liked a post.
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+ *
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+ * Simple Machines Forum (SMF)
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+ *
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+ * @package SMF
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+ * @author Simple Machines http://www.simplemachines.org
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+ * @copyright 2013 Simple Machines and individual contributors
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+ * @license http://www.simplemachines.org/about/smf/license.php BSD
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+ *
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+ * @version 2.1 Alpha 1
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+ */
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+
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+if (!defined('SMF'))
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+ die('No direct access...');
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+
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+/**
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+ * The main handler. Verifies permissions (whether the user can see the content in question)
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+ * before either liking/unliking or spitting out the list of likers.
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+ * Accessed from index.php?action=likes
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+ */
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+function Likes()
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+{
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+ global $context, $smcFunc;
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+
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+ // Zerothly, they did indicate some kind of content to like, right?
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+ $like_type = isset($_GET['ltype']) ? $_GET['ltype'] : '';
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+ preg_match('~^([a-z0-9\-\_]{1,6})~i', $like_type, $matches);
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+ $like_type = isset($matches[1]) ? $matches[1] : '';
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+ $like_content = isset($_GET['like']) ? (int) $_GET['like'] : 0;
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+
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+ if ($like_type == '' || $like_content <= 0)
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+ fatal_lang_error(isset($_GET['view']) ? 'cannot_view_likes' : 'cannot_like_content', false);
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+
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+ // First we need to verify if the user can see the type of content or not. This is set up to be extensible,
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+ // so we'll check for the one type we do know about, and if it's not that, we'll defer to any hooks.
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+ if ($like_type == 'msg')
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+ {
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+ // So we're doing something off a like. We need to verify that it exists, and that the current user can see it.
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+ // Fortunately for messages, this is quite easy to do - and we'll get the topic id while we're at it, because
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+ // we need this later for other things.
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+ $request = $smcFunc['db_query']('', '
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+ SELECT m.id_topic
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+ FROM {db_prefix}messages AS m
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+ INNER JOIN {db_prefix}boards AS b ON (m.id_board = b.id_board)
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+ WHERE {query_see_board}
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+ AND m.id_msg = {int:msg}',
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+ array(
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+ 'msg' => $like_content,
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+ )
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+ );
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+ if ($smcFunc['db_num_rows']($request) == 1)
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+ list ($id_topic) = $smcFunc['db_fetch_row']($request);
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+
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+ $smcFunc['db_free_result']($request);
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+ if (empty($id_topic))
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+ fatal_lang_error(isset($_GET['view']) ? 'cannot_view_likes' : 'cannot_like_content', false);
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+
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+ // So we know what topic it's in and more importantly we know the user can see it.
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+ // If we're not viewing, we need some info set up.
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+ if (!isset($_GET['view']))
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+ {
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+ $context['flush_cache'] = 'likes_topic_' . $id_topic . '_' . $context['user']['id'];
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+ $context['redirect_from_like'] = 'topic=' . $id_topic . '.msg' . $like_content . '#msg' . $like_content;
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+ add_integration_function('integrate_issue_like', 'msg_issue_like', '', false);
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+ }
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+ }
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+ else
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+ {
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+ // Modders: This will give you whatever the user offers up in terms of liking, e.g. $like_type=msg, $like_content=1
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+ // When you hook this, check $like_type first. If it is not something your mod worries about, return false.
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+ // Otherwise, determine (however you need to) that the user can see the relevant liked content (and it exists).
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+ // If the user cannot see it, return false. If the user can see it and can like it, you MUST return your $like_type back.
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+ // See also issueLike() for further notes.
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+ $can_like = call_integration_hook('integrate_valid_likes', array($like_type, $like_content));
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+
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+ $found = false;
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+ if (!empty($can_like))
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+ {
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+ $can_like = (array) $can_like;
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+ foreach ($can_like as $result)
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+ {
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+ if ($result !== false)
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+ {
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+ $like_type = $result;
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+ $found = true;
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+ break;
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+ }
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+ }
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+ }
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+
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+ if (!$found)
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+ fatal_lang_error(isset($_GET['view']) ? 'cannot_view_likes' : 'cannot_like_content', false);
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+ }
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+
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+ // So at this point, whatever type of like the user supplied and the item of content in question,
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+ // we know it exists, now we need to figure out what we're doing with that.
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+
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+ if (isset($_GET['view']))
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+ viewLikes($like_type, $like_content);
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+ else
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+ {
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+ // Only registered users may actually like content.
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+ is_not_guest();
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+ issueLike($like_type, $like_content);
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+ }
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+}
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+
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+function issueLike($like_type, $like_content)
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+{
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+ global $context, $smcFunc;
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+
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+ // Do we already like this?
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+ $request = $smcFunc['db_query']('', '
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+ SELECT content_id, content_type, id_member
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+ FROM {db_prefix}user_likes
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+ WHERE content_id = {int:like_content}
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+ AND content_type = {string:like_type}
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+ AND id_member = {int:id_member}',
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+ array(
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+ 'like_content' => $like_content,
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+ 'like_type' => $like_type,
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+ 'id_member' => $context['user']['id'],
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+ )
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+ );
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+ $already_liked = $smcFunc['db_num_rows']($request) != 0;
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+ $smcFunc['db_free_result']($request);
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+
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+ if ($already_liked)
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+ {
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+ $smcFunc['db_query']('', '
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+ DELETE FROM {db_prefix}user_likes
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+ WHERE content_id = {int:like_content}
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+ AND content_type = {string:like_type}
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+ AND id_member = {int:id_member}',
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+ array(
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+ 'like_content' => $like_content,
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+ 'like_type' => $like_type,
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+ 'id_member' => $context['user']['id'],
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+ )
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+ );
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+ }
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+ else
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+ {
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+ $smcFunc['db_insert']('insert',
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+ '{db_prefix}user_likes',
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+ array('content_id' => 'int', 'content_type' => 'string-6', 'id_member' => 'int', 'like_time' => 'int'),
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+ array($like_content, $like_type, $context['user']['id'], time()),
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+ array('content_id', 'content_type', 'id_member')
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+ );
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+ }
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+
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+ // Now, how many people like this content now? We *could* just +1 / -1 the relevant container but that has proven to become unstable.
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+ $request = $smcFunc['db_query']('', '
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+ SELECT COUNT(id_member)
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+ FROM {db_prefix}user_likes
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+ WHERE content_id = {int:like_content}
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+ AND content_type = {string:like_type}',
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+ array(
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+ 'like_content' => $like_content,
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+ 'like_type' => $like_type,
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+ )
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+ );
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+ list ($num_likes) = $smcFunc['db_fetch_row']($request);
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+ $smcFunc['db_free_result']($request);
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+
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+ // Sometimes there might be other things that need updating after we do this like.
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+ call_integration_hook('integrate_issue_like', array($like_type, $like_content, $num_likes));
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+
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+ // Now some clean up. This is provided here for any like handlers that want to do any cache flushing.
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+ // This way a like handler doesn't need to explicitly declare anything in integrate_issue_like, but do so
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+ // in integrate_valid_likes where it absolutely has to exist.
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+ if (!empty($context['flush_cache']))
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+ cache_put_data($context['flush_cache'], null);
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+
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+ if (!empty($context['redirect_from_like']))
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+ redirectexit($context['redirect_from_like']);
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+ else
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+ redirectexit(); // Because we have to go *somewhere*.
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+}
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+
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+/**
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+ * Callback attached to integrate_issue_like.
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+ * Partly it indicates how it's supposed to work and partly it deals with updating the count of likes
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+ * attached to this message now.
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+ */
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+function msg_issue_like($like_type, $like_content, $num_likes)
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+{
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+ global $smcFunc;
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+
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+ if ($like_type !== 'msg')
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+ return;
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+
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+ $smcFunc['db_query']('', '
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+ UPDATE {db_prefix}messages
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+ SET likes = {int:num_likes}
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+ WHERE id_msg = {int:id_msg}',
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+ array(
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+ 'id_msg' => $like_content,
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+ 'num_likes' => $num_likes,
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+ )
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+ );
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+
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+ // Note that we could just as easily have cleared the cache here, or set up the redirection address
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+ // but if your liked content doesn't need to do anything other than have the record in smf_user_likes,
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+ // there's no point in creating another function unnecessarily.
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+}
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+
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+/**
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+ * This is for viewing the people who liked a thing.
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+ * Accessed from index.php?action=likes;view and should generally load in a popup.
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+ * We use a template for this in case themers want to style it.
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+ */
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+function viewLikes($like_type, $like_content)
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+{
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+ global $smcFunc, $txt, $context, $memberContext;
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+
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+ // Firstly, load what we need. We already know we can see this, so that's something.
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+ $context['likers'] = array();
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+ $request = $smcFunc['db_query']('', '
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+ SELECT id_member, like_time
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+ FROM {db_prefix}user_likes
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+ WHERE content_id = {int:like_content}
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+ AND content_type = {string:like_type}
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+ ORDER BY like_time DESC',
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+ array(
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+ 'like_content' => $like_content,
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+ 'like_type' => $like_type,
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+ )
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+ );
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+ while ($row = $smcFunc['db_fetch_assoc']($request))
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+ $context['likers'][$row['id_member']] = array('timestamp' => $row['like_time']);
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+
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+ // Now to get member data, including avatars and so on.
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+ $members = array_keys($context['likers']);
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+ $loaded = loadMemberData($members);
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+ if (count($loaded) != count($members))
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+ {
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+ $members = array_diff($members, $loaded);
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+ foreach ($members as $not_loaded)
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+ unset ($context['likers'][$not_loaded]);
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+ }
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+
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+ foreach ($context['likers'] as $liker => $dummy)
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+ {
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+ $loaded = loadMemberContext($liker);
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+ if (!$loaded)
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+ {
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+ unset ($context['likers'][$liker]);
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+ continue;
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+ }
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+
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+ $context['likers'][$liker]['profile'] = &$memberContext[$liker];
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+ $context['likers'][$liker]['time'] = timeformat($dummy['timestamp']);
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+ }
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+
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+ $count = count($context['likers']);
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+ $title_base = isset($txt['likes_' . $count]) ? 'likes_' . $count : 'likes_n';
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+ $context['page_title'] = strip_tags(sprintf($txt[$title_base], '', comma_format($count)));
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+
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+ // Lastly, setting up for display
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+ loadTemplate('Likes');
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+ loadLanguage('Help'); // for the close window button
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+ $context['template_layers'] = array();
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+ $context['sub_template'] = 'popup';
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+}
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+
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+/**
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+ * What's this? I dunno, what are you talking about? Never seen this before, nope. No sir.
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+ */
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+function BookOfUnknown()
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+{
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+ global $context, $scripturl;
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+
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+ echo '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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+<html xmlns="http://www.w3.org/1999/xhtml"', $context['right_to_left'] ? ' dir="rtl"' : '', '>
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+ <head>
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+ <title>The Book of Unknown, ', @$_GET['verse'] == '2:18' ? '2:18' : '4:16', '</title>
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+ <style type="text/css">
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+ em
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+ {
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+ font-size: 1.3em;
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+ line-height: 0;
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+ }
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+ </style>
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+ </head>
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+ <body style="background-color: #444455; color: white; font-style: italic; font-family: serif;">
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+ <div style="margin-top: 12%; font-size: 1.1em; line-height: 1.4; text-align: center;">';
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+
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+ if (!isset($_GET['verse']) || ($_GET['verse'] != '2:18' && $_GET['verse'] != '22:1-2'))
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+ $_GET['verse'] = '4:16';
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+
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+ if ($_GET['verse'] == '2:18')
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+ echo '
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+ Woe, it was that his name wasn\'t <em>known</em>, that he came in mystery, and was recognized by none. And it became to be in those days <em>something</em>. Something not yet <em id="unknown" name="[Unknown]">unknown</em> to mankind. And thus what was to be known the <em>secret project</em> began into its existence. Henceforth the opposition was only <em>weary</em> and <em>fearful</em>, for now their match was at arms against them.';
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+ elseif ($_GET['verse'] == '4:16')
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+ echo '
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+ And it came to pass that the <em>unbelievers</em> dwindled in number and saw rise of many <em>proselytizers</em>, and the opposition found fear in the face of the <em>x</em> and the <em>j</em> while those who stood with the <em>something</em> grew stronger and came together. Still, this was only the <em>beginning</em>, and what lay in the future was <em id="unknown" name="[Unknown]">unknown</em> to all, even those on the right side.';
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+ elseif ($_GET['verse'] == '22:1-2')
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+ echo '
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+ <p>Now <em>behold</em>, that which was once the secret project was <em id="unknown" name="[Unknown]">unknown</em> no longer. Alas, it needed more than <em>only one</em>, but yet even thought otherwise. It became that the opposition <em>rumored</em> and lied, but still to no avail. Their match, though not <em>perfect</em>, had them outdone.</p>
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+ <p style="margin: 2ex 1ex 0 1ex; font-size: 1.05em; line-height: 1.5; text-align: center;">Let it continue. <em>The end</em>.</p>';
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+
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+ echo '
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+ </div>
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+ <div style="margin-top: 2ex; font-size: 2em; text-align: right;">';
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+
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+ if ($_GET['verse'] == '2:18')
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+ echo '
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+ from <span style="font-family: Georgia, serif;"><strong><a href="', $scripturl, '?action=about:unknown;verse=4:16" style="color: white; text-decoration: none; cursor: text;">The Book of Unknown</a></strong>, 2:18</span>';
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+ elseif ($_GET['verse'] == '4:16')
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+ echo '
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+ from <span style="font-family: Georgia, serif;"><strong><a href="', $scripturl, '?action=about:unknown;verse=22:1-2" style="color: white; text-decoration: none; cursor: text;">The Book of Unknown</a></strong>, 4:16</span>';
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+ elseif ($_GET['verse'] == '22:1-2')
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+ echo '
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+ from <span style="font-family: Georgia, serif;"><strong>The Book of Unknown</strong>, 22:1-2</span>';
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+
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+ echo '
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+ </div>
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+ </body>
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+</html>';
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+
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+ obExit(false);
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+}
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+
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+?>
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Peter Spicer