Created
September 21, 2013 20:39
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Escaping Challenge: Make a PHP script that (Z:) generates JavaScript code that generates an HTML page containing a PHP script that (goto Z)...
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| <?php | |
| /* Escaping Challenge: Make a PHP script that (Z:) generates JavaScript code | |
| * that generates an HTML page containing a PHP script that (goto Z) */ | |
| /* The purpose of this challenge is to demonstrate how complicated escaping can | |
| * get when you're trying to combine 4 different languages (PHP, JavaScript, | |
| * HTML, and string literals). */ | |
| function js_string_escape($data) | |
| { | |
| $safe = ""; | |
| for($i = 0; $i < strlen($data); $i++) | |
| { | |
| if(ctype_alnum($data[$i])) | |
| $safe .= $data[$i]; | |
| else | |
| $safe .= sprintf("\\x%02X", ord($data[$i])); | |
| } | |
| return $safe; | |
| } | |
| function javascriptify($str) { | |
| return $script; | |
| } | |
| echo "<html><body><script>\n"; | |
| echo "var x = \"<pre>" . js_string_escape(htmlentities(file_get_contents(__FILE__), ENT_QUOTES)) . "</pre>\";\n"; | |
| echo "document.body.innerHTML = x;\n"; | |
| echo "</script></body></html>"; | |
| ?> |
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