I wanted to create a really simple short url service for the permalinks on this website (priteshgupta.com) by using the domain prite.sh.
Here is what I came up with:
<?php
// Go to a URL like
// http://shorturl.com/short?url=https://priteshgupta.com/2016/05/sticky-css-footer/
// To generate a URL like http://shorturl.com/GwDJ
$data = file_get_contents('data.json');
$json = json_decode($data, true);
$short_url = substr($_SERVER['REQUEST_URI'], 1);
if ($json[$short_url]) {
// Cache the redirect in the browser
header('HTTP/1.0 301 Moved Permanently');
header("Location: $json[$short_url]");
header('Cache-Control: private');
header('Vary: User-Agent, Accept-Encoding');
} else if ($_GET['q'] === '/short' && $_GET['url']) {
// Generate the unqiue string for the short url
function generate_key() {
$chars = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
$random_key = '';
// For this, I am using 4 characters as the length of my short URLs
for ($i = 0; $i < 4; $i++) {
// 61 = length of $chars - 1
$random_key .= $chars[rand(0, 61)];
}
return $random_key;
}
if (!in_array($_GET['url'], array_values($json))) {
$url_key = generate_key();
while (in_array($random, array_keys($json))) {
$url_key = generate_key();
}
$json[$url_key] = $_GET['url'];
file_put_contents('data.json', json_encode($json, true));
} else {
$url_key = array_search($_GET['url'], $json);
}
echo "<input onClick='this.select();' readonly='true' value='http://shorturl.com/$url_key' />";
} else {
echo 'Read: https://github.com/priteshgupta/ShortURL';
}
The above PHP code uses a JSON file which would be located in the same folder as this PHP file. This also means that the JSON file needs to be initialized (echo '{}' >> 'data.json') and with the right permissions (chmod 666 data.json <- give every user read + write access).
n.b. Since it doesn’t use a database, but rather reads (and writes) to the JSON file for every operation, this isn’t exactly built to scale.
Additionally, this is the Nginx configuration file I use for routing at prite.sh (the error_page, fastcgi, etc, sections are irrelevant, but I’d rather share the entire file).
server {
listen 80 default_server;
listen [::]:80 default_server;
root /var/www/shorturl/html/;
index index.php index.html index.htm;
server_name shorturl.com www.shorturl.com;
location / {
try_files $uri $uri/ /index.php?q=$uri&$args;
}
error_page 404 /404.html;
error_page 500 502 503 504 /50x.html;
location = /50x.html {
root /usr/share/nginx/html;
}
location ~ \.php$ {
try_files $uri =404;
fastcgi_split_path_info ^(.+\.php)(/.+)$;
fastcgi_pass unix:/var/run/php/php7.0-fpm.sock;
fastcgi_index index.php;
include fastcgi_params;
}
}
Source also located at https://github.com/priteshgupta/ShortURL (for ZIP download, etc).