class GetRequestDataSniff

class GetRequestDataSniff implements Sniff {
    
    /**
     * Returns an array of tokens this test wants to listen for.
     *
     * @return array<int|string>
     */
    public function register() {
        return [
            T_VARIABLE,
        ];
    }
    
    //end register()
    
    /**
     * Processes this sniff, when one of its tokens is encountered.
     *
     * @param \PHP_CodeSniffer\Files\File $phpcsFile The file being scanned.
     * @param int                         $stackPtr  The position of the current token in
     *                                               the stack passed in $tokens.
     *
     * @return void
     */
    public function process(File $phpcsFile, $stackPtr) {
        $tokens = $phpcsFile->getTokens();
        $varName = $tokens[$stackPtr]['content'];
        if ($varName !== '$_REQUEST' && $varName !== '$_GET' && $varName !== '$_POST' && $varName !== '$_FILES') {
            return;
        }
        // The only place these super globals can be accessed directly is
        // in the getRequestData() method of the Security class.
        $inClass = false;
        foreach ($tokens[$stackPtr]['conditions'] as $i => $type) {
            if ($tokens[$i]['code'] === T_CLASS) {
                $className = $phpcsFile->findNext(T_STRING, $i);
                $className = $tokens[$className]['content'];
                if (strtolower($className) === 'security') {
                    $inClass = true;
                }
                else {
                    // We don't have nested classes.
                    break;
                }
            }
            else {
                if ($inClass === true && $tokens[$i]['code'] === T_FUNCTION) {
                    $funcName = $phpcsFile->findNext(T_STRING, $i);
                    $funcName = $tokens[$funcName]['content'];
                    if (strtolower($funcName) === 'getrequestdata') {
                        // This is valid.
                        return;
                    }
                    else {
                        // We don't have nested functions.
                        break;
                    }
                }
            }
            
            //end if
        }
        
        //end foreach
        // If we get to here, the super global was used incorrectly.
        // First find out how it is being used.
        $globalName = strtolower(substr($varName, 2));
        $usedVar = '';
        $openBracket = $phpcsFile->findNext(T_WHITESPACE, $stackPtr + 1, null, true);
        if ($tokens[$openBracket]['code'] === T_OPEN_SQUARE_BRACKET) {
            $closeBracket = $tokens[$openBracket]['bracket_closer'];
            $usedVar = $phpcsFile->getTokensAsString($openBracket + 1, $closeBracket - $openBracket - 1);
        }
        $type = 'SuperglobalAccessed';
        $error = 'The %s super global must not be accessed directly; use Security::getRequestData(';
        $data = [
            $varName,
        ];
        if ($usedVar !== '') {
            $type .= 'WithVar';
            $error .= '%s, \'%s\'';
            $data[] = $usedVar;
            $data[] = $globalName;
        }
        $error .= ') instead';
        $phpcsFile->addError($error, $stackPtr, $type, $data);
    }
    
    //end process()

}