Tests: Strip untypical callback parameter characters from PHP files

Only allow alphanumeric characters & underscores for callback parameters.
This is only test code so we're not fixing any security issue but it happens
often enough that the whole jQuery repository directory structure is deployed
onto the server with PHP enabled that it makes is easy to introduce security
issues if this cleanup is not done.

This is a 1.x/2.x version of PR gh-4871.

The change doesn't require a release; it's meant at installations testing
the latest state of `1.12-stable` & `2.2-stable` branches.

This change also fixes testing on Travis & on Chrome/Firefox.

Closes gh-4875
Ref gh-4764
Ref gh-4871

.travis.yml

@@ -1,8 +1,9 @@
 language: node_js
-sudo: false
+os: linux
 node_js:
-- "0.10"
-- "0.12"
 - "4"
-- "5"
 - "6"
+- "8"
+- "10"
+- "12"
+- "14"

test/data/jsonp.php

@@ -1,14 +1,15 @@
 <?php
 error_reporting(0);
+function cleanCallback( $callback ) {
+	return preg_replace( '/[^a-z0-9_]/i', '', $callback );
+}
 $callback = $_REQUEST['callback'];
 if ( ! $callback ) {
 	$callback = explode("?",end(explode("/",$_SERVER['REQUEST_URI'])));
 	$callback = $callback[0];
 }
-$json = $_REQUEST['json'];
-if($json) {
-	echo $callback . '([ {"name": "John", "age": 21}, {"name": "Peter", "age": 25 } ])';
-} else {
-	echo $callback . '({ "data": {"lang": "en", "length": 25} })';
-}
+$json = $_REQUEST['json'] ?
+	'[ { "name": "John", "age": 21 }, { "name": "Peter", "age": 25 } ]' :
+	'{ "data": { "lang": "en", "length": 25 } }';
+echo cleanCallback( $callback ) . '(' . $json . ')';
 ?>

test/data/with_fries_over_jsonp.php

@@ -1,7 +1,11 @@
 <?php
 error_reporting(0);
+function cleanCallback( $callback ) {
+	return preg_replace( '/[^a-z0-9_]/i', '', $callback );
+}
 $callback = $_REQUEST['callback'];
+$cleanCallback = cleanCallback( $callback );
 $json = $_REQUEST['json'];
 $text = json_encode(file_get_contents(dirname(__FILE__)."/with_fries.xml"));
-echo "$callback($text)";
+echo "$cleanCallback($text)\n";
 ?>

test/unit/ajax.js

@@ -1758,6 +1758,11 @@ if ( typeof window.ArrayBuffer === "undefined" || typeof new XMLHttpRequest().re
 		};
 	} );
 
+	// Chrome 78 dropped support for synchronous XHR requests inside of
+	// beforeunload, unload, pagehide, and visibilitychange event handlers.
+	// See https://bugs.chromium.org/p/chromium/issues/detail?id=952452
+	// Safari 13 did similar changes. The below check will catch them both.
+	if ( !/safari/i.test( navigator.userAgent ) ) {
 		testIframeWithCallback(
 			"#14379 - jQuery.ajax() on unload",
 			"ajax/onunload.html",
@@ -1766,6 +1771,7 @@ if ( typeof window.ArrayBuffer === "undefined" || typeof new XMLHttpRequest().re
 				assert.strictEqual( status, "success", "Request completed" );
 			}
 		);
+	}
 
 	ajaxTest( "#14683 - jQuery.ajax() - Exceptions thrown synchronously by xhr.send should be caught", 4, function( assert ) {
 		return [ {

test/unit/support.js

@@ -223,6 +223,7 @@ testIframeWithCallback(
 			"reliableMarginRight": true
 		};
 	} else if ( /firefox/i.test( userAgent ) ) {
+		version = userAgent.match( /firefox\/(\d+)/i )[ 1 ];
 		expected = {
 			"ajax": true,
 			"boxSizingReliable": true,
@@ -237,7 +238,7 @@ testIframeWithCallback(
 			"pixelMarginRight": true,
 			"pixelPosition": true,
 			"radioValue": true,
-			"reliableMarginLeft": false,
+			"reliableMarginLeft": version >= 61,
 			"reliableMarginRight": true
 		};
 	} else if ( /iphone os 9_/i.test( userAgent ) ) {