Update manifest version to 2.4.2 [▶️]

README.md

@@ -1,19 +1,6 @@
 # ICC Meta Redirect plugin for YOURLS
 This YOURLS plugin make it possible to change logo, title, page footer, add custom CSS, and customize favicon lines into your YOURLS installation.
 
-<!-- buttons -->
-[![Stars](https://img.shields.io/github/stars/ivancarlosti/yourlsiccwebmastersettings?label=⭐%20Stars&color=gold&style=flat)](https://github.com/ivancarlosti/yourlsiccwebmastersettings/stargazers)
-[![Watchers](https://img.shields.io/github/watchers/ivancarlosti/yourlsiccwebmastersettings?label=Watchers&style=flat&color=red)](https://github.com/sponsors/ivancarlosti)
-[![Forks](https://img.shields.io/github/forks/ivancarlosti/yourlsiccwebmastersettings?label=Forks&style=flat&color=ff69b4)](https://github.com/sponsors/ivancarlosti)
-[![GitHub commit activity](https://img.shields.io/github/commit-activity/m/ivancarlosti/yourlsiccwebmastersettings?label=Activity)](https://github.com/ivancarlosti/yourlsiccwebmastersettings/pulse)
-[![GitHub Issues](https://img.shields.io/github/issues/ivancarlosti/yourlsiccwebmastersettings?label=Issues&color=orange)](https://github.com/ivancarlosti/yourlsiccwebmastersettings/issues)
-[![License](https://img.shields.io/github/license/ivancarlosti/yourlsiccwebmastersettings?label=License)](LICENSE)  
-[![GitHub last commit](https://img.shields.io/github/last-commit/ivancarlosti/yourlsiccwebmastersettings?label=Last%20Commit)](https://github.com/ivancarlosti/yourlsiccwebmastersettings/commits)
-[![Security](https://img.shields.io/badge/Security-View%20Here-purple)](https://github.com/ivancarlosti/yourlsiccwebmastersettings/security)
-[![Code of Conduct](https://img.shields.io/badge/Code%20of%20Conduct-2.1-4baaaa)](https://github.com/ivancarlosti/yourlsiccwebmastersettings?tab=coc-ov-file)
-[![GitHub Sponsors](https://img.shields.io/github/sponsors/ivancarlosti?label=GitHub%20Sponsors&color=ffc0cb)][sponsor]
-<!-- endbuttons -->
-
 ## Inspiration
 * Project inspired by [YOURLS-GWallChangeLogo](https://github.com/gioxx/YOURLS-GWallChangeLogo), [YOURLS-GWallChangeTitle](https://github.com/gioxx/YOURLS-GWallChangeTitle),.
 
@@ -57,13 +44,10 @@ input {
 * For personal support and queries, please submit a new issue to have it addressed.
 * For commercial related questions, please [**contact me**][ivancarlos] for consulting costs. 
 
-## 🩷 Project support
+| 🩷 Project support |
-| If you found this project helpful, consider |
 | :---: |
-[**buying me a coffee**][buymeacoffee], [**donate by paypal**][paypal], [**sponsor this project**][sponsor] or just [**leave a star**](../..)⭐
+If you found this project helpful, consider [**buying me a coffee**][buymeacoffee]
 |Thanks for your support, it is much appreciated!|
 
 [ivancarlos]: https://ivancarlos.me
 [buymeacoffee]: https://www.buymeacoffee.com/ivancarlos
-[paypal]: https://icc.gg/donate
-[sponsor]: https://github.com/sponsors/ivancarlosti

authenticator.php

@@ -0,0 +1,243 @@
+<?php
+
+class PHPGangsta_GoogleAuthenticator
+{
+    protected $_codeLength = 6;
+
+    /**
+     * Create new secret.
+     * 16 characters, randomly chosen from the allowed base32 characters.
+     *
+     * @param int $secretLength
+     *
+     * @return string
+     */
+    public function createSecret($secretLength = 16)
+    {
+        $validChars = $this->_getBase32LookupTable();
+
+        // Valid secret lengths are 80 to 640 bits
+        if ($secretLength < 16 || $secretLength > 128) {
+            throw new Exception('Bad secret length');
+        }
+        $secret = '';
+        $rnd = false;
+        if (function_exists('random_bytes')) {
+            $rnd = random_bytes($secretLength);
+        } elseif (function_exists('mcrypt_create_iv')) {
+            $rnd = mcrypt_create_iv($secretLength, MCRYPT_DEV_URANDOM);
+        } elseif (function_exists('openssl_random_pseudo_bytes')) {
+            $rnd = openssl_random_pseudo_bytes($secretLength, $cryptoStrong);
+            if (!$cryptoStrong) {
+                $rnd = false;
+            }
+        }
+        if ($rnd !== false) {
+            for ($i = 0; $i < $secretLength; ++$i) {
+                $secret .= $validChars[ord($rnd[$i]) & 31];
+            }
+        } else {
+            throw new Exception('No source of secure random');
+        }
+
+        return $secret;
+    }
+
+    /**
+     * Calculate the code, with given secret and point in time.
+     *
+     * @param string   $secret
+     * @param int|null $timeSlice
+     *
+     * @return string
+     */
+    public function getCode($secret, $timeSlice = null)
+    {
+        if ($timeSlice === null) {
+            $timeSlice = floor(time() / 30);
+        }
+
+        $secretkey = $this->_base32Decode($secret);
+
+        // Pack time into binary string
+        $time = chr(0).chr(0).chr(0).chr(0).pack('N*', $timeSlice);
+        // Hash it with users secret key
+        $hm = hash_hmac('SHA1', $time, $secretkey, true);
+        // Use last nipple of result as index/offset
+        $offset = ord(substr($hm, -1)) & 0x0F;
+        // grab 4 bytes of the result
+        $hashpart = substr($hm, $offset, 4);
+
+        // Unpak binary value
+        $value = unpack('N', $hashpart);
+        $value = $value[1];
+        // Only 32 bits
+        $value = $value & 0x7FFFFFFF;
+
+        $modulo = pow(10, $this->_codeLength);
+
+        return str_pad($value % $modulo, $this->_codeLength, '0', STR_PAD_LEFT);
+    }
+
+    /**
+     * Get QR-Code URL for image, from google charts.
+     *
+     * @param string $name
+     * @param string $secret
+     * @param string $title
+     * @param array  $params
+     *
+     * @return string
+     */
+    public function getQRCodeGoogleUrl($name, $secret, $title = null, $params = array())
+    {
+        $width = !empty($params['width']) && (int) $params['width'] > 0 ? (int) $params['width'] : 200;
+        $height = !empty($params['height']) && (int) $params['height'] > 0 ? (int) $params['height'] : 200;
+        $level = !empty($params['level']) && array_search($params['level'], array('L', 'M', 'Q', 'H')) !== false ? $params['level'] : 'M';
+
+        $urlencoded = urlencode('otpauth://totp/'.$name.'?secret='.$secret.'');
+        if (isset($title)) {
+            $urlencoded .= urlencode('&issuer='.urlencode($title));
+        }
+
+        return "https://api.qrserver.com/v1/create-qr-code/?data=$urlencoded&size=${width}x${height}&ecc=$level";
+    }
+
+    /**
+     * Check if the code is correct. This will accept codes starting from $discrepancy*30sec ago to $discrepancy*30sec from now.
+     *
+     * @param string   $secret
+     * @param string   $code
+     * @param int      $discrepancy      This is the allowed time drift in 30 second units (8 means 4 minutes before or after)
+     * @param int|null $currentTimeSlice time slice if we want use other that time()
+     *
+     * @return bool
+     */
+    public function verifyCode($secret, $code, $discrepancy = 1, $currentTimeSlice = null)
+    {
+        if ($currentTimeSlice === null) {
+            $currentTimeSlice = floor(time() / 30);
+        }
+
+        if (strlen($code) != 6) {
+            return false;
+        }
+
+        for ($i = -$discrepancy; $i <= $discrepancy; ++$i) {
+            $calculatedCode = $this->getCode($secret, $currentTimeSlice + $i);
+            if ($this->timingSafeEquals($calculatedCode, $code)) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+    /**
+     * Set the code length, should be >=6.
+     *
+     * @param int $length
+     *
+     * @return PHPGangsta_GoogleAuthenticator
+     */
+    public function setCodeLength($length)
+    {
+        $this->_codeLength = $length;
+
+        return $this;
+    }
+
+    /**
+     * Helper class to decode base32.
+     *
+     * @param $secret
+     *
+     * @return bool|string
+     */
+    protected function _base32Decode($secret)
+    {
+        if (empty($secret)) {
+            return '';
+        }
+
+        $base32chars = $this->_getBase32LookupTable();
+        $base32charsFlipped = array_flip($base32chars);
+
+        $paddingCharCount = substr_count($secret, $base32chars[32]);
+        $allowedValues = array(6, 4, 3, 1, 0);
+        if (!in_array($paddingCharCount, $allowedValues)) {
+            return false;
+        }
+        for ($i = 0; $i < 4; ++$i) {
+            if ($paddingCharCount == $allowedValues[$i] &&
+                substr($secret, -($allowedValues[$i])) != str_repeat($base32chars[32], $allowedValues[$i])) {
+                return false;
+            }
+        }
+        $secret = str_replace('=', '', $secret);
+        $secret = str_split($secret);
+        $binaryString = '';
+        for ($i = 0; $i < count($secret); $i = $i + 8) {
+            $x = '';
+            if (!in_array($secret[$i], $base32chars)) {
+                return false;
+            }
+            for ($j = 0; $j < 8; ++$j) {
+                $x .= str_pad(base_convert(@$base32charsFlipped[@$secret[$i + $j]], 10, 2), 5, '0', STR_PAD_LEFT);
+            }
+            $eightBits = str_split($x, 8);
+            for ($z = 0; $z < count($eightBits); ++$z) {
+                $binaryString .= (($y = chr(base_convert($eightBits[$z], 2, 10))) || ord($y) == 48) ? $y : '';
+            }
+        }
+
+        return $binaryString;
+    }
+
+    /**
+     * Get array with all 32 characters for decoding from/encoding to base32.
+     *
+     * @return array
+     */
+    protected function _getBase32LookupTable()
+    {
+        return array(
+            'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', //  7
+            'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', // 15
+            'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', // 23
+            'Y', 'Z', '2', '3', '4', '5', '6', '7', // 31
+            '=',  // padding char
+        );
+    }
+
+    /**
+     * A timing safe equals comparison
+     * more info here: http://blog.ircmaxell.com/2014/11/its-all-about-time.html.
+     *
+     * @param string $safeString The internal (safe) value to be checked
+     * @param string $userString The user submitted (unsafe) value
+     *
+     * @return bool True if the two strings are identical
+     */
+    private function timingSafeEquals($safeString, $userString)
+    {
+        if (function_exists('hash_equals')) {
+            return hash_equals($safeString, $userString);
+        }
+        $safeLen = strlen($safeString);
+        $userLen = strlen($userString);
+
+        if ($userLen != $safeLen) {
+            return false;
+        }
+
+        $result = 0;
+
+        for ($i = 0; $i < $userLen; ++$i) {
+            $result |= (ord($safeString[$i]) ^ ord($userString[$i]));
+        }
+
+        // They are only identical strings if $result is exactly 0...
+        return $result === 0;
+    }
+}

manifest.json

@@ -1,4 +1,4 @@
 {
-  "version": "1.4.0",
+  "version": "2.4.2",
   "author": "Ivan Carlos"
 }

plugin.php

@@ -1,25 +1,35 @@
 <?php
 /*
 Plugin Name: ICC Webmaster Settings
-Plugin URI: https://github.com/ivancarlosti/yourlsiccwebmastersettings
+Plugin URI: https://git.icc.gg/ivancarlos/yourlsiccwebmastersettings
-Description: Change Logo, Title, Page Footer, add custom CSS, and customize favicon lines
+Description: Customize logo, title, footer, CSS, favicons, add 2FA & reCAPTCHA, HTTP, 301/302 redirects, allow dash/underscore, force lowercase, remove share buttons.
-Version: 1.01
+Version: 3.0
 Author: Ivan Carlos
 Author URI: https://ivancarlos.com.br/
 */
 
 // No direct call
-if( !defined( 'YOURLS_ABSPATH' ) ) die();
+if (!defined('YOURLS_ABSPATH'))
+    die();
+
+// Default redirect delay in seconds (used when option unset)
+define('ICC_MRDR_DEFAULT_DELAY', 1);
+
+// Load 2FA library
+require_once 'authenticator.php';
 
 // Register unified config page
 yourls_add_action('plugins_loaded', 'icc_config_add_page');
-function icc_config_add_page() {
+function icc_config_add_page()
+{
     yourls_register_plugin_page('icc_logo_title_footer_favicon_config', 'Webmaster Settings', 'icc_config_do_page');
 }
 
 // Handle and display unified config page
-function icc_config_do_page() {
+function icc_config_do_page()
-    if( isset( $_POST['icc_submit'] ) ) icc_config_update_option();
+{
+    if (isset($_POST['icc_submit']))
+        icc_config_update_option();
 
     // Options
     $icc_logo_imageurl = yourls_get_option('icc_logo_imageurl');
@@ -27,12 +37,14 @@ function icc_config_do_page() {
     $icc_logo_imageurl_title = yourls_get_option('icc_logo_imageurl_title');
     $icc_title_custom = yourls_get_option('icc_title_custom');
     $icc_footer_text = yourls_get_option('icc_footer_text');
-    if ($icc_footer_text === false) $icc_footer_text = '';
+    if ($icc_footer_text === false)
+        $icc_footer_text = '';
     $footer_text_escaped = htmlspecialchars($icc_footer_text);
 
     // Custom CSS option
     $icc_custom_css = yourls_get_option('icc_custom_css');
-    if ($icc_custom_css === false) $icc_custom_css = '';
+    if ($icc_custom_css === false)
+        $icc_custom_css = '';
     $custom_css_escaped = htmlspecialchars($icc_custom_css);
 
     $defaults = [
@@ -43,13 +55,111 @@ function icc_config_do_page() {
     $favicon_options = [];
     foreach ($defaults as $key => $default_value) {
         $val = yourls_get_option($key);
-        if ($val === false) $val = $default_value;
+        if ($val === false)
+            $val = $default_value;
         $favicon_options[$key] = $val;
     }
+
+    // reCAPTCHA options
+    $icc_recaptcha_enabled = yourls_get_option('icc_recaptcha_enabled');
+    $icc_recaptcha_site_key = yourls_get_option('icc_recaptcha_site_key');
+    $icc_recaptcha_secret_key = yourls_get_option('icc_recaptcha_secret_key');
+
+    $recaptcha_checked = $icc_recaptcha_enabled ? 'checked' : '';
     $escape_attr = function ($str) {
         return htmlspecialchars($str, ENT_QUOTES | ENT_HTML5);
     };
 
+    // Meta Redirect options
+    $icc_mrdr_url_prefix = yourls_get_option('icc_mrdr_url_prefix');
+    if ($icc_mrdr_url_prefix === false)
+        $icc_mrdr_url_prefix = '.';
+
+    $icc_mrdr_delay = yourls_get_option('icc_mrdr_delay');
+    if ($icc_mrdr_delay === false || !is_numeric($icc_mrdr_delay) || (int) $icc_mrdr_delay < 0) {
+        $icc_mrdr_delay = ICC_MRDR_DEFAULT_DELAY;
+    }
+    $escaped_delay = (int) $icc_mrdr_delay;
+
+    // 302 Redirect options
+    $icc_302_redirect_enabled = yourls_get_option('icc_302_redirect_enabled');
+    // 302 Redirect options
+    $icc_302_redirect_enabled = yourls_get_option('icc_302_redirect_enabled');
+    $redirect_302_checked = $icc_302_redirect_enabled ? 'checked' : '';
+
+    // Remove Share options
+    $icc_remove_share_enabled = yourls_get_option('icc_remove_share_enabled');
+    $remove_share_checked = $icc_remove_share_enabled ? 'checked' : '';
+
+    // Allow Dash/Underscore options
+    $icc_allow_dash_underscore_enabled = yourls_get_option('icc_allow_dash_underscore_enabled');
+    $allow_dash_underscore_checked = $icc_allow_dash_underscore_enabled ? 'checked' : '';
+
+    // Force Lowercase options
+    $icc_force_lowercase_enabled = yourls_get_option('icc_force_lowercase_enabled');
+    $force_lowercase_checked = $icc_force_lowercase_enabled ? 'checked' : '';
+
+    // 2FA options
+    $icc_2fa_tokens = json_decode(yourls_get_option('icc_2fa_tokens', '{}'), true);
+    $user_2fa = isset($icc_2fa_tokens[YOURLS_USER]) ? $icc_2fa_tokens[YOURLS_USER] : ['active' => false, 'secret' => '', 'type' => ''];
+    $is_2fa_active = $user_2fa['active'];
+
+    // Handle 2FA Actions
+    $twofa_message = '';
+    if (isset($_POST['icc_2fa_activate'])) {
+        $ga = new PHPGangsta_GoogleAuthenticator();
+        $secret = $ga->createSecret();
+        $icc_2fa_tokens[YOURLS_USER] = [
+            'active' => false,
+            'secret' => $secret,
+            'type' => 'otp'
+        ];
+        yourls_update_option('icc_2fa_tokens', json_encode($icc_2fa_tokens));
+        $user_2fa = $icc_2fa_tokens[YOURLS_USER];
+    } elseif (isset($_POST['icc_2fa_verify'])) {
+        $token = isset($_POST['icc_2fa_token']) ? trim($_POST['icc_2fa_token']) : '';
+        $ga = new PHPGangsta_GoogleAuthenticator();
+        if ($ga->verifyCode($user_2fa['secret'], $token, 2)) {
+            $icc_2fa_tokens[YOURLS_USER]['active'] = true;
+            yourls_update_option('icc_2fa_tokens', json_encode($icc_2fa_tokens));
+            $is_2fa_active = true;
+            $twofa_message = '<p style="color:green;">2FA Activated successfully!</p>';
+        } else {
+            $twofa_message = '<p style="color:red;">Invalid token. Please try again.</p>';
+        }
+    } elseif (isset($_POST['icc_2fa_deactivate'])) {
+        $icc_2fa_tokens[YOURLS_USER]['active'] = false;
+        $icc_2fa_tokens[YOURLS_USER]['secret'] = '';
+        yourls_update_option('icc_2fa_tokens', json_encode($icc_2fa_tokens));
+        $is_2fa_active = false;
+        $twofa_message = '<p style="color:blue;">2FA Deactivated.</p>';
+    }
+
+    $twofa_html = '';
+    if ($is_2fa_active) {
+        $twofa_html = '<p>2FA is currently <strong>enabled</strong>.</p>
+                       <form method="post">
+                           <input type="submit" name="icc_2fa_deactivate" value="Deactivate 2FA" class="button" />
+                       </form>';
+    } else {
+        if (isset($_POST['icc_2fa_activate']) || (isset($_POST['icc_2fa_verify']) && !$is_2fa_active)) {
+            $ga = new PHPGangsta_GoogleAuthenticator();
+            $qrCodeUrl = $ga->getQRCodeGoogleUrl('YOURLS (' . YOURLS_USER . ')', $user_2fa['secret']);
+            $twofa_html = '<p>1. Scan this QR code with your Authenticator app (Google Authenticator, Authy, etc.):</p>
+                           <p><img src="' . $qrCodeUrl . '" style="border:1px solid #ccc;" /></p>
+                           <p>2. Enter the 6-digit code from the app to verify:</p>
+                           <form method="post">
+                               <input type="text" name="icc_2fa_token" size="6" maxlength="6" autocomplete="off" />
+                               <input type="submit" name="icc_2fa_verify" value="Verify and Activate" class="button" />
+                           </form>';
+        } else {
+            $twofa_html = '<p>2FA is currently <strong>disabled</strong>.</p>
+                           <form method="post">
+                               <input type="submit" name="icc_2fa_activate" value="Setup 2FA" class="button" />
+                           </form>';
+        }
+    }
+
     echo <<<HTML
 <h2>Webmaster Settings</h2>
 <form method="post">
@@ -82,37 +192,143 @@ function icc_config_do_page() {
     <p><label for="favicon_shortcut_icon" style="display: inline-block; width: 200px;">Shortcut Icon (favicon.ico) URL</label>
     <input type="text" id="favicon_shortcut_icon" name="favicon_shortcut_icon" value="{$escape_attr($favicon_options['favicon_shortcut_icon'])}" size="80" /></p>
 
+    <h3>reCAPTCHA v3 Settings</h3>
+    <p>
+        <label for="icc_recaptcha_enabled" style="display: inline-block; width: 200px;">Enable reCAPTCHA v3</label>
+        <input type="checkbox" id="icc_recaptcha_enabled" name="icc_recaptcha_enabled" value="1" {$recaptcha_checked} />
+    </p>
+    <p><label for="icc_recaptcha_site_key" style="display: inline-block; width: 200px;">Site Key</label>
+    <input type="text" id="icc_recaptcha_site_key" name="icc_recaptcha_site_key" value="{$escape_attr($icc_recaptcha_site_key)}" size="80" placeholder="Required if enabled" /></p>
+    <p><label for="icc_recaptcha_secret_key" style="display: inline-block; width: 200px;">Secret Key</label>
+    <input type="text" id="icc_recaptcha_secret_key" name="icc_recaptcha_secret_key" value="{$escape_attr($icc_recaptcha_secret_key)}" size="80" placeholder="Required if enabled" /></p>
+
+    <h3>Meta Redirect Settings</h3>
+    <p>
+        <label for="icc_mrdr_url_prefix" style="display:inline-block; width:200px;">Redirect Prefix Character</label>
+        <input type="text" id="icc_mrdr_url_prefix" name="icc_mrdr_url_prefix" value="{$escape_attr($icc_mrdr_url_prefix)}" maxlength="1" size="80" />
+        <br><span style="padding-left: 205px;"><small>Single character prefix to trigger meta redirect. Default is a dot (.)</small></span>
+    </p>
+    <p>
+        <label for="icc_mrdr_delay" style="display:inline-block; width:200px;">Redirect Delay (seconds)</label>
+        <input type="number" id="icc_mrdr_delay" name="icc_mrdr_delay" value="{$escaped_delay}" min="0" step="1" size="80" />
+        <br><span style="padding-left: 205px;"><small>Delay before redirecting. Default is 1 second. Use 0 for immediate redirect.</small></span>
+    </p>
+
+    <h3>Redirect Code Settings</h3>
+    <p>
+        <label for="icc_302_redirect_enabled" style="display: inline-block; width: 200px;">Force 302 Redirect</label>
+        <input type="checkbox" id="icc_302_redirect_enabled" name="icc_302_redirect_enabled" value="1" {$redirect_302_checked} />
+        <br><span style="padding-left: 205px;"><small>Use 302 (Temporary) instead of 301 (Permanent) for standard redirects.</small></span>
+    </p>
+
+    <h3>Interface Settings</h3>
+    <p>
+        <label for="icc_remove_share_enabled" style="display: inline-block; width: 200px;">Remove Share Button</label>
+        <input type="checkbox" id="icc_remove_share_enabled" name="icc_remove_share_enabled" value="1" {$remove_share_checked} />
+        <br><span style="padding-left: 205px;"><small>Remove the Share button and box from the Admin Dashboard.</small></span>
+    </p>
+    <p>
+        <label for="icc_allow_dash_underscore_enabled" style="display: inline-block; width: 200px;">Allow Dash & Underscore</label>
+        <input type="checkbox" id="icc_allow_dash_underscore_enabled" name="icc_allow_dash_underscore_enabled" value="1" {$allow_dash_underscore_checked} />
+        <br><span style="padding-left: 205px;"><small>Allow dashes (-) and underscores (_) in custom short URLs.</small></span>
+    </p>
+    <p>
+        <label for="icc_force_lowercase_enabled" style="display: inline-block; width: 200px;">Force Lowercase</label>
+        <input type="checkbox" id="icc_force_lowercase_enabled" name="icc_force_lowercase_enabled" value="1" {$force_lowercase_checked} />
+        <br><span style="padding-left: 205px;"><small>Force uppercase keywords to be converted to lowercase (e.g., ABC -> abc).</small></span>
+    </p>
+
     <p><input type="submit" name="icc_submit" value="Update values" /></p>
 </form>
+
+<hr style="margin-top: 40px" />
+<h3>2FA (Two-Factor Authentication)</h3>
+{$twofa_message}
+{$twofa_html}
 <hr style="margin-top: 40px" />
 <p><strong><a href="https://ivancarlos.me/" target="_blank">Ivan Carlos</a></strong>  &raquo; 
-<a href="http://github.com/ivancarlosti/" target="_blank">GitHub</a> &raquo; 
 <a href="https://buymeacoffee.com/ivancarlos" target="_blank">Buy Me a Coffee</a></p>
 HTML;
 }
 
 // Update options
-function icc_config_update_option() {
+function icc_config_update_option()
+{
     $fields_logo = ['icc_logo_imageurl', 'icc_logo_imageurl_tag', 'icc_logo_imageurl_title'];
     foreach ($fields_logo as $key) {
-        if (isset($_POST[$key])) yourls_update_option($key, strval($_POST[$key]));
+        if (isset($_POST[$key]))
+            yourls_update_option($key, strval($_POST[$key]));
     }
-    if (isset($_POST['icc_title_custom'])) yourls_update_option('icc_title_custom', strval($_POST['icc_title_custom']));
+    if (isset($_POST['icc_title_custom']))
-    if (isset($_POST['icc_footer_text'])) yourls_update_option('icc_footer_text', $_POST['icc_footer_text']);
+        yourls_update_option('icc_title_custom', strval($_POST['icc_title_custom']));
-    if (isset($_POST['icc_custom_css'])) yourls_update_option('icc_custom_css', $_POST['icc_custom_css']);
+    if (isset($_POST['icc_footer_text']))
+        yourls_update_option('icc_footer_text', $_POST['icc_footer_text']);
+    if (isset($_POST['icc_custom_css']))
+        yourls_update_option('icc_custom_css', $_POST['icc_custom_css']);
     $fields_favicon = ['favicon_icon32', 'favicon_icon16', 'favicon_shortcut_icon'];
     foreach ($fields_favicon as $key) {
-        if (isset($_POST[$key])) yourls_update_option($key, strval($_POST[$key]));
+        if (isset($_POST[$key]))
+            yourls_update_option($key, strval($_POST[$key]));
     }
+
+    // reCAPTCHA update
+    $recaptcha_enabled = isset($_POST['icc_recaptcha_enabled']);
+    $site_key = isset($_POST['icc_recaptcha_site_key']) ? trim($_POST['icc_recaptcha_site_key']) : '';
+    $secret_key = isset($_POST['icc_recaptcha_secret_key']) ? trim($_POST['icc_recaptcha_secret_key']) : '';
+
+    if ($recaptcha_enabled && (empty($site_key) || empty($secret_key))) {
+        echo '<div class="error"><p><strong>Error:</strong> both Site Key and Secret Key are required to enable reCAPTCHA.</p></div>';
+        // Do not update enabled status if validation fails
+    } else {
+        yourls_update_option('icc_recaptcha_enabled', $recaptcha_enabled);
+        yourls_update_option('icc_recaptcha_site_key', $site_key);
+        yourls_update_option('icc_recaptcha_secret_key', $secret_key);
+    }
+
+    // Meta Redirect update
+    if (isset($_POST['icc_mrdr_url_prefix'])) {
+        $prefix = substr(trim($_POST['icc_mrdr_url_prefix']), 0, 1);
+        if ($prefix === '') {
+            yourls_delete_option('icc_mrdr_url_prefix');
+        } else {
+            yourls_update_option('icc_mrdr_url_prefix', $prefix);
+        }
+    }
+    if (isset($_POST['icc_mrdr_delay'])) {
+        $delay = intval($_POST['icc_mrdr_delay']);
+        if ($delay < 0)
+            $delay = ICC_MRDR_DEFAULT_DELAY;
+        yourls_update_option('icc_mrdr_delay', $delay);
+    }
+
+    // 302 Redirect update
+    $redirect_302_enabled = isset($_POST['icc_302_redirect_enabled']);
+    yourls_update_option('icc_302_redirect_enabled', $redirect_302_enabled);
+    $redirect_302_enabled = isset($_POST['icc_302_redirect_enabled']);
+    yourls_update_option('icc_302_redirect_enabled', $redirect_302_enabled);
+
+    // Remove Share update
+    $remove_share_enabled = isset($_POST['icc_remove_share_enabled']);
+    yourls_update_option('icc_remove_share_enabled', $remove_share_enabled);
+
+    // Allow Dash/Underscore update
+    $allow_dash_underscore_enabled = isset($_POST['icc_allow_dash_underscore_enabled']);
+    yourls_update_option('icc_allow_dash_underscore_enabled', $allow_dash_underscore_enabled);
+
+    // Force Lowercase update
+    $force_lowercase_enabled = isset($_POST['icc_force_lowercase_enabled']);
+    yourls_update_option('icc_force_lowercase_enabled', $force_lowercase_enabled);
 }
 
 // Show custom logo
 yourls_add_filter('pre_html_logo', 'icc_hideoriginallogo');
-function icc_hideoriginallogo() {
+function icc_hideoriginallogo()
+{
     echo '<span id="hideYourlsLogo" style="display:none">';
 }
 yourls_add_filter('html_logo', 'icc_logo');
-function icc_logo() {
+function icc_logo()
+{
     echo '</span>';
     echo '<h1 id="yourls.logo">';
     echo '<a href="' . yourls_admin_url('index.php') . '" title="' . yourls_get_option('icc_logo_imageurl_title') . '"><span>';
@@ -122,23 +338,28 @@ function icc_logo() {
 
 // Show custom title
 yourls_add_filter('html_title', 'icc_change_title');
-function icc_change_title( $value ) {
+function icc_change_title($value)
+{
     $custom = yourls_get_option('icc_title_custom');
-    if ($custom !== '') return $custom;
+    if ($custom !== '')
+        return $custom;
     return $value;
 }
 
 // Replace footer text with custom footer from option
 yourls_add_filter('html_footer_text', 'icc_change_footer');
-function icc_change_footer( $value ) {
+function icc_change_footer($value)
+{
     $custom_footer = yourls_get_option('icc_footer_text');
-    if ( !empty($custom_footer) ) return $custom_footer;
+    if (!empty($custom_footer))
+        return $custom_footer;
     return $value;
 }
 
 // Output favicon lines (only if set)
 yourls_add_filter('shunt_html_favicon', 'icc_plugin_favicon');
-function icc_plugin_favicon() {
+function icc_plugin_favicon()
+{
     $opts = [
         'favicon_icon32' => yourls_get_option('favicon_icon32'),
         'favicon_icon16' => yourls_get_option('favicon_icon16'),
@@ -158,9 +379,256 @@ function icc_plugin_favicon() {
 
 // Output custom CSS if set
 yourls_add_action('html_head', 'icc_print_custom_css');
-function icc_print_custom_css() {
+function icc_print_custom_css()
+{
     $css = yourls_get_option('icc_custom_css');
     if ($css !== false && trim($css) !== '') {
         echo "<style>\n" . $css . "\n</style>\n";
     }
 }
+
+// reCAPTCHA v3 Integration
+yourls_add_action('html_head', 'icc_recaptcha_v3_html_head');
+
+function icc_recaptcha_v3_html_head()
+{
+    if (!yourls_get_option('icc_recaptcha_enabled'))
+        return;
+
+    $site_key = yourls_get_option('icc_recaptcha_site_key');
+    if ($site_key) {
+        echo '<script src="https://www.google.com/recaptcha/api.js?render=' . htmlspecialchars($site_key, ENT_QUOTES) . '"></script>';
+    }
+}
+
+yourls_add_action('login_form_bottom', 'icc_recaptcha_v3_login_form');
+function icc_recaptcha_v3_login_form()
+{
+    if (!yourls_get_option('icc_recaptcha_enabled'))
+        return;
+    echo '<div id="recaptcha"></div>';
+    echo '<input type="hidden" name="token" id="tokenInput">';
+}
+
+yourls_add_action('login_form_end', 'icc_recaptcha_v3_inject_script');
+function icc_recaptcha_v3_inject_script()
+{
+    if (!yourls_get_option('icc_recaptcha_enabled'))
+        return;
+    $site_key = yourls_get_option('icc_recaptcha_site_key');
+    if ($site_key) {
+        echo '<script>
+            grecaptcha.ready(function() {
+                grecaptcha.execute(\'' . htmlspecialchars($site_key, ENT_QUOTES) . '\', {action: \'submit\'}).then(function(token) {
+                    document.getElementById(\'tokenInput\').value = token;
+                });
+            });
+        </script>';
+    }
+}
+
+yourls_add_action('pre_login_username_password', 'icc_recaptcha_v3_validation');
+function icc_recaptcha_v3_validation()
+{
+    if (!yourls_get_option('icc_recaptcha_enabled'))
+        return;
+
+    $site_key = yourls_get_option('icc_recaptcha_site_key');
+    $secret_key = yourls_get_option('icc_recaptcha_secret_key');
+
+    if (empty($site_key) || empty($secret_key))
+        return; // Should not happen if validation works, but safety net
+
+    $token = isset($_POST['token']) ? $_POST['token'] : '';
+
+    // call curl to POST request
+    $ch = curl_init();
+    curl_setopt($ch, CURLOPT_URL, "https://www.google.com/recaptcha/api/siteverify");
+    curl_setopt($ch, CURLOPT_POST, 1);
+    curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query(array('secret' => $secret_key, 'response' => $token)));
+    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
+    $response = curl_exec($ch);
+    curl_close($ch);
+    $arrResponse = json_decode($response, true);
+
+    // verify the response
+    if (isset($arrResponse["success"]) && $arrResponse["success"] == '1' && isset($arrResponse["score"]) && $arrResponse["score"] >= 0.5) {
+        // reCAPTCHA succeeded
+        return true;
+    } else {
+        // reCAPTCHA failed
+        yourls_login_screen($error_msg = 'reCAPTCHA verification failed');
+        yourls_die('reCAPTCHA verification failed. Please try again.');
+        return false;
+    }
+}
+
+// Meta Redirect Logic
+yourls_add_action('loader_failed', 'icc_mrdr_redirect');
+function icc_mrdr_redirect($args)
+{
+    // Get prefix from option or fallback default
+    $prefix = yourls_get_option('icc_mrdr_url_prefix');
+    if ($prefix === false || $prefix === '') {
+        $prefix = '.';
+    }
+
+    // Get delay from option or fallback default
+    $delay = yourls_get_option('icc_mrdr_delay');
+    if ($delay === false || !is_numeric($delay) || (int) $delay < 0) {
+        $delay = ICC_MRDR_DEFAULT_DELAY;
+    }
+    $delay = (int) $delay;
+
+    // Escape prefix safely for regex
+    $escaped_prefix = preg_quote($prefix, '!');
+
+    // Check if requested keyword starts with prefix
+    if (isset($args[0]) && preg_match('!^' . $escaped_prefix . '(.*)!', $args[0], $matches)) {
+        $keyword = yourls_sanitize_keyword($matches[1]);
+
+        // Load YOURLS core to use the URL functions if not already available (usually available in this hook context)
+        // require_once(dirname(__FILE__) . '/../../../includes/load-yourls.php'); // Not typically needed inside a plugin hook
+
+        $url = yourls_get_keyword_longurl($keyword);
+        if (!$url) {
+            return; // No redirect
+        }
+
+        // Output meta refresh redirect with configured delay
+        echo '<!DOCTYPE html><html><head><meta http-equiv="refresh" content="' . $delay . '; url=' . htmlspecialchars($url, ENT_QUOTES) . '"></head><body>';
+        echo 'You will be redirected to <a href="' . htmlspecialchars($url, ENT_QUOTES) . '">' . htmlspecialchars($url) . '</a>.';
+        echo '</body></html>';
+        exit;
+    }
+}
+
+// 302 Redirect Logic
+yourls_add_action('pre_redirect', 'icc_force_302_redirect');
+function icc_force_302_redirect($args)
+{
+    if (!yourls_get_option('icc_302_redirect_enabled'))
+        return;
+
+    $url = $args[0];
+    $code = $args[1];
+    if ($code != 302) {
+        // Redirect with 302 instead
+        yourls_redirect($url, 302);
+        die();
+    }
+}
+
+// Allow dash and underscore in custom short URLs
+if (yourls_get_option('icc_allow_dash_underscore_enabled')) {
+    yourls_add_filter('get_shorturl_charset', 'icc_custom_shorturl_charset');
+    yourls_add_filter('get_shorturl_charset_regex', 'icc_custom_shorturl_charset_regex');
+}
+
+function icc_custom_shorturl_charset($charset)
+{
+    return $charset . '-_';
+}
+
+function icc_custom_shorturl_charset_regex($pattern)
+{
+    return $pattern . '|[-_]';
+}
+
+// Force Lowercase Logic
+if (yourls_get_option('icc_force_lowercase_enabled')) {
+    // Redirection: http://sho.rt/ABC first converted to http://sho.rt/abc
+    yourls_add_filter('get_request', 'icc_break_the_web_lowercase');
+
+    // Short URL creation: custom keyword 'ABC' converted to 'abc'
+    yourls_add_action('add_new_link_custom_keyword', 'icc_break_the_web_add_filter');
+
+    // Force random keywords to be lowercase
+    yourls_add_filter('random_keyword', 'icc_break_the_web_lowercase');
+}
+
+function icc_break_the_web_lowercase($keyword)
+{
+    return strtolower($keyword);
+}
+
+function icc_break_the_web_add_filter()
+{
+    yourls_add_filter('get_shorturl_charset', 'icc_break_the_web_add_uppercase');
+    yourls_add_filter('custom_keyword', 'icc_break_the_web_lowercase');
+}
+
+function icc_break_the_web_add_uppercase($charset)
+{
+    return $charset . strtoupper($charset);
+}
+
+// Remove Share Functionality
+if (yourls_get_option('icc_remove_share_enabled')) {
+    // Dump the Share button
+    yourls_add_filter('table_add_row_action_array', 'icc_rmv_row_action_share');
+    // No Share Box either
+    yourls_add_filter('shunt_share_box', 'icc_shunt_share_box');
+}
+
+function icc_rmv_row_action_share($links)
+{
+    if (array_key_exists('share', $links))
+        unset($links['share']);
+
+    return $links;
+}
+
+function icc_shunt_share_box($shunt)
+{
+    return true;
+}
+
+// 2FA Support Logic
+
+// Add 2FA input to the login form
+yourls_add_action('login_form_bottom', 'icc_2fa_add_input');
+function icc_2fa_add_input()
+{
+    echo '<p>
+        <label for="icc_2fa_otp">' . yourls__('2FA Token') . '</label><br />
+        <input type="text" id="icc_2fa_otp" name="icc_2fa_otp" placeholder="' . yourls__('Leave empty if not enabled') . '" size="30" class="text" autocomplete="off" />
+    </p>';
+}
+
+// Attach 2FA validate function
+yourls_add_filter('is_valid_user', 'icc_2fa_validate');
+function icc_2fa_validate($is_valid)
+{
+    // If user failed to properly authenticate, return
+    if (!$is_valid) {
+        return false;
+    }
+
+    // If cookies are set, we are already logged in OR if this is an API request, skip 2fa
+    if (isset($_COOKIE[yourls_cookie_name()]) || yourls_is_API()) {
+        return $is_valid;
+    }
+
+    $icc_2fa_tokens = json_decode(yourls_get_option('icc_2fa_tokens', '{}'), true);
+
+    if (!isset($icc_2fa_tokens[YOURLS_USER]) || !$icc_2fa_tokens[YOURLS_USER]['active']) {
+        // User has not enabled 2fa
+        return $is_valid;
+    }
+
+    // User has enabled 2FA
+    if ($icc_2fa_tokens[YOURLS_USER]['type'] == 'otp') {
+        $token = isset($_REQUEST['icc_2fa_otp']) ? trim($_REQUEST['icc_2fa_otp']) : '';
+        if (empty($token)) {
+            return false;
+        }
+
+        $ga = new PHPGangsta_GoogleAuthenticator();
+        if ($ga->verifyCode($icc_2fa_tokens[YOURLS_USER]['secret'], $token, 2)) {
+            return true;
+        }
+    }
+
+    return false;
+}