<?php

/*
 * This file is part of Psy Shell.
 *
 * (c) 2012-2023 Justin Hileman
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Psy\Util;

/**
 * String utility methods.
 *
 * @author ju1ius
 */
class Str
{
    const UNVIS_RX = <<<'EOS'
/
    \\(?:
        ((?:040)|s)
        | (240)
        | (?: M-(.) )
        | (?: M\^(.) )
        | (?: \^(.) )
    )
/xS
EOS;

    /**
     * Decodes a string encoded by libsd's strvis.
     *
     * From `man 3 vis`:
     *
     * Use an ‘M’ to represent meta characters (characters with the 8th bit set),
     * and use a caret ‘^’ to represent control characters (see iscntrl(3)).
     * The following formats are used:
     *
     *      \040    Represents ASCII space.
     *
     *      \240    Represents Meta-space (&nbsp in HTML).
     *
     *      \M-C    Represents character ‘C’ with the 8th bit set.
     *              Spans characters ‘\241’ through ‘\376’.
     *
     *      \M^C    Represents control character ‘C’ with the 8th bit set.
     *              Spans characters ‘\200’ through ‘\237’, and ‘\377’ (as ‘\M^?’).
     *
     *      \^C     Represents the control character ‘C’.
     *              Spans characters ‘\000’ through ‘\037’, and ‘\177’ (as ‘\^?’).
     *
     * The other formats are supported by PHP's stripcslashes,
     * except for the \s sequence (ASCII space).
     *
     * @param string $input The string to decode
     */
    public static function unvis(string $input): string
    {
        $output = \preg_replace_callback(self::UNVIS_RX, [self::class, 'unvisReplace'], $input);

        // other escapes & octal are handled by stripcslashes
        return \stripcslashes($output);
    }

    /**
     * Callback for Str::unvis.
     *
     * @param array $match The matches passed by preg_replace_callback
     */
    protected static function unvisReplace(array $match): string
    {
        // \040, \s
        if (!empty($match[1])) {
            return "\x20";
        }
        // \240
        if (!empty($match[2])) {
            return "\xa0";
        }
        // \M-(.)
        if (isset($match[3]) && $match[3] !== '') {
            $chr = $match[3];
            // unvis S_META1
            $cp = 0200;
            $cp |= \ord($chr);

            return \chr($cp);
        }
        // \M^(.)
        if (isset($match[4]) && $match[4] !== '') {
            $chr = $match[4];
            // unvis S_META | S_CTRL
            $cp = 0200;
            $cp |= ($chr === '?') ? 0177 : \ord($chr) & 037;

            return \chr($cp);
        }
        // \^(.)
        if (isset($match[5]) && $match[5] !== '') {
            $chr = $match[5];
            // unvis S_CTRL
            $cp = 0;
            $cp |= ($chr === '?') ? 0177 : \ord($chr) & 037;

            return \chr($cp);
        }
    }
}

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                        Request Example (guzzle)
                        

                        
                            
<?php
                            
 require_once('vendor/autoload.php');
                            
 $client = new \GuzzleHttp\Client();
                            
 $response = $client->request('POST', $base_url. 'v1/generate-token', [
                            
'headers' => [
                            
  'accept' => 'application/json',
                            
  'content-type' => 'application/json',
                            
 ],
                            
'form_params' => [
                            
  'client_id'     => '$client_id',
                            
  'secret_id'     => 'secret_id',
                            
  'env'           => 'env',
                            
  'merchant_id'   => 'merchant_id',
                            
 ],
                            
                            
]);
                            
echo $response->getBody();
                        
                    
                

                    
                        
**Response: SUCCESS (200 OK)**
                        
{
                        
 "message": {
                        
 "success": [
                        
  "Successfully token is generated"
                        
 ]
                        
},
                        
"data": {
                        
 "token":"eyJpdiI6InpkczhjTjhQdVhUL2lKQ0pSUUx6aUE9P
SIsInZhbHVlIjoiVGVBTVBDTXltbjNZcEIvdEJveGpTSno3TU5NRUtn
VkhCZ1pHTFNCUnZGQ2UxMnYxN202cEE1YVRDTEFsc0ZERExoTjdtL0dTL2x
oU3QzeUJJOExiMUx5T0w1L0llUXhTUkU1cWVLWEdEbEplb0dKNXcwbTNRM0
VxdkUwYzZuNFdtNkhMQ0pRZysyNWkvdzBxSlBoSVBSOGFTekNnR2RXNHVtc
G9lMGZOTmNCcm1hR3c5Sk9KTnB4Y3ltZDl6cm90MThrR21Ca3B1azc3bXRi
Q0J6SW96UVo1elNkU1ZqeE05bTcwWGp1MEUxWlJFdnNWTmpSbnVpeW92b2U
4dXZkUGgyb1VmK0luaGdyaFlsVTZlcVpVRnZlTG1DeFF6Ykk2T2h6Z3Jzbn
IyNHpNdHowSE5JdDR0Y0pZT20zUm1XYW8iLCJtYWMiOiJlY2M4NGE1OGUzYz
kzYzk0YzljNmVmNjE0YWI0ZDIwOGI3NDQ2YWEyY2ZhNzc0NzE4ZmY1ZmYyMz

                        IyZmQzNDY1IiwidGFnIjoiIn0=",
                        
},
                        
"type": "success"
                        
}
                    
                

                    
                        
**Response: ERROR (400 FAILED)**
                        
{
                        
 "message": {
                        
 "error": [
                        
  "Invalid credentials."
                        
 ]
                        
},
                        
"data": null,
                        
"type": "error"
                        
}