Guestbook

Source Code

<!DOCTYPE html>
<html lang="en">
<head>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Simple Guestbook</title>
<style>
body {
	font-family: Arial, sans-serif;
	max-width: 800px;
	margin: 0 auto;
	padding: 20px;
	line-height: 1.6;
	tab-size: 4;
}
h1 {
	text-align: center;
	font-size: 2.5rem;
	margin-bottom: 20px;
}

ul {
	list-style-type: none;
	padding: 0;
}

ul li {
	border-bottom: 1px solid #ccc;
	padding: 10px 0;
}

ul li:last-child {
	border-bottom: none;
}

ul li h3 {
	font-size: 1.2rem;
	margin: 0 0 5px;
}

ul li p {
	margin: 0;
}

ul li small {
	display: block;
	font-size: 0.8rem;
	color: #777;
	margin-top: 5px;
}

form {
	margin-top: 20px;
}

label {
	display: block;
	margin-bottom: 5px;
}

input, textarea {
	width: 100%;
	font-family: inherit;
	padding: 5px;
	margin-bottom: 15px;
}

input[type="submit"] {
	width: auto;
	cursor: pointer;
}
</style>
</head>
<?

postgres(PG) :-
	(  getenv("POSTGRES_URL", URL)
	-> postgres_open_url(URL, PG)
	;  postgres_open("localhost", PG, [port(32768), user("postgres"), password("password"), dbname("postgres")])
	),
	postgres_execute(PG, "CREATE TABLE IF NOT EXISTS guestbook (id serial primary key, time timestamp default CURRENT_TIMESTAMP, author text, msg text);", [], _).
	%true.

posts(Posts) :-
	postgres(PG),
	postgres_query(PG, "SELECT author, msg, to_char(time, 'YYYY-MM-DD HH24:MM:SS') FROM guestbook ORDER BY id DESC;", [], Posts, _).

spamlike  --> ..., spam_word, ... .
spam_word --> "www." | "https:" | "http:".
spam_word --> { banned_Word(Word) }, Word.

banned_Word(Word) :-
	getenv("BANNED_WORDS", Banned),
	split_string(Banned, ",", "", Words),
	member(Word, Words).

spamlike(Cs) :-
	once(phrase(spamlike, Cs)).

add_post :-
	current_http_method(post),
	form_value(author, Author),
	form_value(message, Message),
	\+spamlike(Author),
	\+spamlike(Message),
	postgres(PG),
	postgres_execute(PG, "INSERT INTO guestbook (author, msg) VALUES($1, $2)", [string(Author), string(Message)], _).

:- ignore(add_post).

?>
<body>
<h1>Guestbook</h1>

<section>
<form method="POST">
	<label for="author">Your Name:</label>
	<input type="text" id="author" name="author" required>
	<label for="message">Message:</label>
	<textarea id="message" name="message" rows="4" required></textarea>
	<input type="submit" name="submit" value="Submit">
</form>
</section>

<ul>
<?findall posts(Posts), member(row(string(Name), string(Msg), string(Date)), Posts). ?>
	<li>
		<h3><?=Name ?></h3>
		<p><?=Msg ?></p>
		<small><?=Date ?></small>
	</li>
<?end ?>
</ul>

<section>
	<h2>Source Code</h2>
	<pre><?=Source current_file(File), read_file_to_string(File, Source, []). ?></pre>
</section>
</body>
</html>