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<?php
include_once './includes/Session.php';
include_once './includes/Database.php';
include_once './includes/model/User.php';
include_once './includes/model/Thread.php';
// Utility functions for building the post HTML
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);
}
class Post
{
public $id;
public $content;
public $date_created;
public $thread_id;
public $author_id;
private $has_value = false;
public function __construct($id)
{
$sql = "SELECT post_content, post_date_created, post_thread, post_author FROM posts WHERE post_id = ?;";
$result = Database::get()->query($sql, "i", $id);
if (empty($result)) {
return;
}
$this->id = $id;
$this->content = $result[0]['post_content'];
$this->date_created = $result[0]['post_date_created'];
$this->thread_id = $result[0]['post_thread'];
$this->author_id = $result[0]['post_author'];
$this->has_value = true;
}
public function has_value(): bool
{
return $this->has_value;
}
public function get_parent_thread(): ?Thread
{
return new Thread($this->thread_id);
}
public function get_author(): ?User
{
$result = new User();
$result->get_by_id($this->author_id);
return $result;
}
/**
* Get the post content from the database and return it as a string ready for HTML display
*/
function get_content(): string
{
// Build the header
$author = $this->get_author();
$result = '<p class="header" id="p' . $this->id . '"><b>#' . $this->id . '</b>';
$result .= ' Posted by <a href="viewuser.php?id=' . $author->id . '">' . $author->name . '</a>';
$result .= ' on ' . date('m/d/Y g:ia', strtotime($this->date_created));
if (Session::get()->is_signed_in() && Session::get()->get_current_user()->level == USER_LEVEL_MODERATOR) {
$result .= '<a href="moderate.php?type=post&id=' . $this->id . '" style="float:right;">[Options]</a>';
}
$result .= '</p>';
// Append the formatted post content
$result .= '<span class="post-content">' . format_post_content($this->content) . '</span>';
return $result;
}
function set_content(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 != $this->author_id) {
trigger_error("You don't have sufficient permissions to edit this post.");
return;
}
// Set the post content and the post edit date
$sql = "UPDATE posts SET post_content = ? WHERE post_id = ?;";
Database::get()->query($sql, "si", $post_content, $this->id);
}
function delete()
{
// 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
if (Session::get()->get_current_user()->level != USER_LEVEL_MODERATOR) {
trigger_error("You don't have sufficient permissions to delete this post.");
return;
}
// Delete the post from the database
Database::get()->query("DELETE FROM posts WHERE post_id = ?", "i", $this->id);
// Decrement the post count of the category
Database::get()->query("UPDATE categories SET `category_post_count` = `category_post_count` - '1' WHERE category_id = ?", "i", $this->get_parent_thread()->category_id);
}
public static function create($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
$sql = "UPDATE categories SET `category_post_count` = `category_post_count` + '1' WHERE category_id = ?;";
Database::get()->query($sql, "i", $post_category);
// Set the last post date of the parent thread
$sql = "UPDATE threads SET thread_last_post_date = CONVERT_TZ(NOW(), 'SYSTEM', '+00:00') WHERE thread_id = ?;";
Database::get()->query($sql, "i", $post_thread);
}
public static function get_all_posts(): array
{
$sql = "SELECT post_id FROM posts";
$result = Database::get()->query($sql);
$posts = array();
foreach ($result as $row) {
$post = new Post($row['post_id']);
array_push($posts, $post);
}
return $posts;
}
}
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