Add URL_STRIP_EXTENSION constant (#2)

This small update allows users to remove the file extension from
the resulting URL, as requested. This is useful for instances using
a rewrite rule in order to automatically find the corresponsing file.

Be careful, as the filename generator only checks against existing
files of the same extension. It is therefore possible to have two files
with the exact same name, as long as they have a different extension.

Version bumped to 2.3.0

sharexen.php

@@ -64,6 +64,10 @@
 // Example: ['Mario', 'Toad'] (sorry Luigi)
 define('ADMINS', []);
 
+// Strip file extensions from generated URLs
+// This is only useful if you have a rewrite rule
+define('URL_STRIP_EXTENSION', false);
+
 // Log requests to Discord using a webhook
 // If you do not know what this is about, please ignore
 // It is not recommended to set this if your API is heavily used
@@ -180,6 +184,16 @@ function check_constants()
 			'Invalid ADMINS constant, must be an array.');
 	}
 
+	if (!defined('URL_STRIP_EXTENSION'))
+	{
+		define('URL_STRIP_EXTENSION', false);
+	}
+	if (gettype(URL_STRIP_EXTENSION) !== 'boolean')
+	{
+		error_die($data, 500, 'invalid_server_configuration',
+			'Invalid URL_STRIP_EXTENSION constant, must be a boolean.');
+	}
+
 	if (!defined('DISCORD_WEBHOOK_URL'))
 	{
 		define('DISCORD_WEBHOOK_URL', '');
@@ -466,6 +480,11 @@ function generate_all_urls(&$data, $deletion = true)
 
 	$data['url'] = "$protocol$domain$sub$name";
 
+	if (URL_STRIP_EXTENSION)
+	{
+		$data['url'] = preg_replace('/\.[^.]+$/', '', $data['url']);
+	}
+
 	if (!$deletion)
 	{
 		return;
@@ -741,7 +760,7 @@ function info_endpoint(&$data)
 	}
 }
 
-define('VERSION', '2.2.1');
+define('VERSION', '2.3.0');
 define('SOURCE', 'https://github.com/Xenthys/ShareXen');
 
 $data = [