From eb770fdc6d809bc7c28d499f897c0ab2c449f669 Mon Sep 17 00:00:00 2001
From: George Petculescu <gxgpet@gmail.com>
Date: Sun, 28 Feb 2021 20:10:00 +0200
Subject: Initial implementation of samesite for CI_Input::set_cookie

---
 system/core/Input.php | 25 ++++++++++++++++++++++---
 1 file changed, 22 insertions(+), 3 deletions(-)

(limited to 'system')

diff --git a/system/core/Input.php b/system/core/Input.php
index 30d528b89..a7f4edee9 100644
--- a/system/core/Input.php
+++ b/system/core/Input.php
@@ -300,14 +300,15 @@ class CI_Input {
 	 * @param	string		$prefix		Cookie name prefix
 	 * @param	bool		$secure		Whether to only transfer cookies via SSL
 	 * @param	bool		$httponly	Whether to only makes the cookie accessible via HTTP (no javascript)
+	 * @param	string		$samesite	SameSite attribute. NULL will avoid sending the attribute
 	 * @return	void
 	 */
-	public function set_cookie($name, $value = '', $expire = 0, $domain = '', $path = '/', $prefix = '', $secure = NULL, $httponly = NULL)
+	public function set_cookie($name, $value = '', $expire = 0, $domain = '', $path = '/', $prefix = '', $secure = NULL, $httponly = NULL, $samesite = NULL)
 	{
 		if (is_array($name))
 		{
 			// always leave 'name' in last place, as the loop will break otherwise, due to $$item
-			foreach (array('value', 'expire', 'domain', 'path', 'prefix', 'secure', 'httponly', 'name') as $item)
+			foreach (array('value', 'expire', 'domain', 'path', 'prefix', 'secure', 'httponly', 'name', 'samesite') as $item)
 			{
 				if (isset($name[$item]))
 				{
@@ -348,7 +349,25 @@ class CI_Input {
 			$expire = ($expire > 0) ? time() + $expire : 0;
 		}
 
-		setcookie($prefix.$name, $value, $expire, $path, $domain, $secure, $httponly);
+		if ($samesite === NULL && config_item('cookie_samesite') !== NULL)
+		{
+			$samesite = strtolower(config_item('cookie_samesite'));
+		}
+		elseif ($samesite !== NULL)
+		{
+			$samesite = strtolower($samesite);
+		}
+
+		if ( ! in_array($samesite, array('lax', 'strict', 'none', NULL), TRUE))
+		{
+			$samesite = NULL;
+		}
+
+		$cookie_header = 'Set-Cookie: '.$prefix.$name.'='.rawurlencode($value);
+		$cookie_header .= ($expire === 0 ? '' : '; expires='.gmdate('D, d-M-Y H:i:s T', 0));
+		$cookie_header .= '; path='.$path.($domain !== '' ? '; domain='.$domain : '');
+		$cookie_header .= ($secure ? '; secure' : '').($httponly ? '; HttpOnly' : '').($samesite !== NULL ? '; SameSite='.$samesite : '');
+		header($cookie_header);
 	}
 
 	// --------------------------------------------------------------------
-- 
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