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<?php
include_once './includes/Session.php';
include_once './includes/Database.php';
include_once './includes/model/User.php';
function get_all_posts(): array
{
$sql = "SELECT post_id FROM posts";
$result = Database::get()->query($sql);
$posts = array();
foreach ($result as $row) {
$post = new Post();
$post->get_from_database($row['post_id']);
array_push($posts, $post);
}
return $posts;
}
function create_post($post_content, $post_thread, $post_category)
{
// User must be signed in
if (!Session::get()->is_signed_in()) {
trigger_error('You must be signed in to create a post');
return;
}
$user = Session::get()->get_current_user();
// Insert the post into the database
$sql = "INSERT INTO posts(post_content, post_date_created, post_thread, post_author) VALUES (?, CONVERT_TZ(NOW(), 'SYSTEM', '+00:00'), ?, ?);";
Database::get()->query($sql, "sii", $post_content, $post_thread, $user->id);
// Increment the category's post count
$sql = "UPDATE categories SET `cat_post_count` = `cat_post_count` + '1' WHERE cat_id = ?;";
Database::get()->query($sql, "i", $post_category);
// Set the last post date of the parent thread
$sql = "UPDATE threads SET thread_date_lastpost = CONVERT_TZ(NOW(), 'SYSTEM', '+00:00') WHERE thread_id = ?;";
Database::get()->query($sql, "i", $post_thread);
}
function create_quote(int $id): string
{
$sql = "SELECT post_content, post_author, post_thread, user_name FROM posts LEFT JOIN users ON post_author = user_id WHERE post_id = ?;";
$result = Database::get()->query($sql, "i", $id);
$reply = $result[0];
if (empty($reply)) {
return '<blockquote><span style="color:red;">This post has been deleted</span></blockquote>';
}
return '<blockquote><a href="/viewthread.php?id=' . $reply['post_thread'] . '#p' . $id . '">Quote from ' . $reply['user_name'] . '</a><br>' . $reply['post_content'] . '</blockquote>';
}
function format_post_content(string $post_content)
{
$post_content = preg_replace_callback('/>#\d+/', function ($matches) {
$result = "";
foreach ($matches as $match) {
$id = (int) filter_var($match, FILTER_SANITIZE_NUMBER_INT);
$result .= create_quote($id);
}
return $result;
}, $post_content);
$result = $post_content;
// Replace newline characters with HTML <br> tags
$result = nl2br($result);
// Replace YouTube URLs with embedded YouTube videos.
$result = preg_replace(
"/\s*[a-zA-Z\/:]*youtu(be.com\/watch\?v=|.be\/)([a-zA-Z0-9\-_]+)([a-zA-Z0-9\/*-_?&;%=.]*)/i",
'<br><iframe class="youtube-embed" src="//www.youtube.com/embed/$2" allowfullscreen></iframe>', $result);
// Replace Image URLs with embedded images.
$result = preg_replace('@\b(http(s)?://)([^\s]*?(?:\.[a-z\d?=/_-]+)+(?:\.jpg|\.png|\.gif))(?![^<]*?(?:</\w+>|/?>))@i', '<img class="image-embed" src="http$2://$3" alt="http$2://$3" />', $result);
// Replace other URLs with links.
return preg_replace('@\b(http(s)?://)([^\s]*?(?:\.[a-z\d?=/_-]+)+)(?![^<]*?(?:</\w+>|/?>))@i', '<a href="http$2://$3">$0</a>', $result);
}
/**
* Get the post content from the database and return it as a string ready for HTML display
*/
function get_post_content(Post $post): string
{
// Build the header
$result = '<div class="header" id="p' . $post->id . '"><b>#' . $post->id . '</b>';
$result .= ' Posted by <a href="viewuser.php?id=' . $post->author->id . '">' . $post->author->name . '</a>';
$result .= ' on ' . date('m/d/Y g:ia', strtotime($post->date_created));
// If the post has a edit date, display it
if (!is_null($post->date_edited)) {
$result .= ' <small>edited ' . date('m/d/Y g:ia', strtotime($post->date_edited)) . '</small>';
}
// Append a manage post button if the user is signed in and is the post's creator
if (Session::get()->is_signed_in() && Session::get()->get_current_user()->id == $post->author->id) {
$result .= '<span style="float:right;">';
$result .= '[<a href="manage_post.php?id=' . $post->id . '">Edit/Delete</a>]';
$result .= '</span>';
}
$result .= '</div>';
// Append the formatted post content
$result .= '<span class="post-content">' . format_post_content($post->content) . '</span>';
return $result;
}
function edit_post(Post $post, string $post_content)
{
// User must be signed in
if (!Session::get()->is_signed_in()) {
trigger_error('You must be signed in to edit this post!');
return;
}
// User must have permission to edit the post
$current_user = Session::get()->get_current_user();
if ($current_user->id != $post->author->id) {
trigger_error("You don't have sufficient permissions to edit this post.");
return;
}
// Set the post content and the post edit date
$sql = "UPDATE posts SET post_content = ?, post_date_edited = CONVERT_TZ(NOW(), 'SYSTEM', '+00:00') WHERE post_id = ?;";
Database::get()->query($sql, "si", $post_content, $post->id);
}
function delete_post(Post $post)
{
// User must be signed in
if (!Session::get()->is_signed_in()) {
trigger_error('You must be signed in to delete a post!');
return;
}
// User must have permission to delete the post
$current_user = Session::get()->get_current_user();
if ($current_user->id != $post->author->id || $current_user->level != USER_LEVEL_MODERATOR) {
trigger_error("You don't have sufficient permissions to delete this post.");
return;
}
// TODO: The post must not be locked
// TODO: The post must have not been around for a certain amount of time
// Delete the post from the database
Database::get()->query("DELETE FROM posts WHERE post_id = ?", "i", $post->id);
// Decrement the post count of the category
Database::get()->query("UPDATE categories SET `cat_post_count` = `cat_post_count` - '1' WHERE cat_id = ?", "i", $post->thread->category->id);
}
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