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File: aksara/Helpers/captcha_helper.php

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File: aksara/Helpers/captcha_helper.php
Role: Auxiliary script
Content type: text/plain
Description: Auxiliary script
Class: Aksara
A CodeIgniter based API and CRUD generator
Author: By
Last change: Initial commit for update 5.0.0
Date: 4 months ago
Size: 7,449 bytes
 

Contents

Class file image Download
<?php

/**
 * This file is part of Aksara CMS, both framework and publishing
 * platform.
 *
 * @author Aby Dahana <abydahana@gmail.com>
 * @copyright (c) Aksara Laboratory <https://aksaracms.com>
 * @license MIT License
 *
 * This source file is subject to the MIT license that is bundled
 * with this source code in the LICENSE.txt file.
 *
 * When the signs is coming, those who don't believe at "that time"
 * have only two choices, commit suicide or become brutal.
 */

/**
 * CodeIgniter CAPTCHA Helper
 *
 * @category Helpers
 * @author EllisLab Dev Team
 * @see https://codeigniter.com/user_guide/helpers/captcha_helper.html
 */

// ------------------------------------------------------------------------

if (! function_exists('create_captcha')) {
   
/**
     * Create CAPTCHA
     *
     * @param array $data Data for the CAPTCHA
     * @param string $img_path Path to create the image in (deprecated)
     * @param string $img_url URL to the CAPTCHA image folder (deprecated)
     * @param string $font_path Server path to font (deprecated)
     *
     * @return string
     */
   
function create_captcha($data = '', $img_path = '', $img_url = '', $font_path = '')
    {
       
$defaults = [
           
'word' => '',
           
'img_path' => '',
           
'img_url' => '',
           
'img_width' => '150',
           
'img_height' => '30',
           
'font_path' => '',
           
'expiration' => 7200,
           
'word_length' => 8,
           
'font_size' => 16,
           
'img_id' => '',
           
'pool' => '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ',
           
'colors' => [
               
'background' => [255, 255, 255],
               
'border' => [153, 102, 102],
               
'text' => [204, 153, 153],
               
'grid' => [255, 182, 182]
            ]
        ];

        foreach (
$defaults as $key => $val) {
            if (!
is_array($data) && empty($$key)) {
                $
$key = $val;
            } else {
                $
$key = isset($data[$key]) ? $data[$key] : $val;
            }
        }

        if (
'' === $img_path or '' === $img_url
                            
or ! is_dir($img_path) or ! is_really_writable($img_path)
                             or !
extension_loaded('gd')) {
            return
false;
        }

       
// -----------------------------------
        // Remove old images
        // -----------------------------------

       
$now = microtime(true);

        try {
           
$current_dir = @opendir($img_path);
            while (
$filename = @readdir($current_dir)) {
                if (
in_array(substr($filename, -4), ['.jpg', '.png'])
                    && (
str_replace(['.jpg', '.png'], '', $filename) + $expiration) < $now) {
                    @
unlink($img_path.$filename);
                }
            }

            @
closedir($current_dir);
        } catch(\
Throwable $e) {
        }

        if (!
is_string($word)) {
           
$word = (string) $word;
        } elseif (empty(
$word)) {
           
$word = substr(str_shuffle(str_repeat($pool, ceil($word_length / strlen($pool)))), 1, $word_length);
        }

       
// -----------------------------------
        // Determine angle and position
        // -----------------------------------
       
$length = strlen($word);
       
$angle = ($length >= 6) ? mt_rand(-($length - 6), ($length - 6)) : 0;
       
$x_axis = mt_rand(6, (360 / $length) - 16);
       
$y_axis = ($angle >= 0) ? mt_rand($img_height, $img_width) : mt_rand(6, $img_height);

       
// Create image
        // PHP.net recommends imagecreatetruecolor(), but it isn't always available
       
$im = function_exists('imagecreatetruecolor')
            ?
imagecreatetruecolor($img_width, $img_height)
            :
imagecreate($img_width, $img_height);

       
// -----------------------------------
        // Assign colors
        // ----------------------------------

       
is_array($colors) or $colors = $defaults['colors'];

        foreach (
array_keys($defaults['colors']) as $key) {
           
// Check for a possible missing value
           
is_array($colors[$key]) or $colors[$key] = $defaults['colors'][$key];
           
$colors[$key] = imagecolorallocate($im, $colors[$key][0], $colors[$key][1], $colors[$key][2]);
        }

       
// Create the rectangle
       
ImageFilledRectangle($im, 0, 0, $img_width, $img_height, $colors['background']);

       
// -----------------------------------
        // Create the spiral pattern
        // -----------------------------------
       
$theta = 1;
       
$thetac = 7;
       
$radius = 16;
       
$circles = 20;
       
$points = 32;

        for (
$i = 0, $cp = ($circles * $points) - 1; $i < $cp; $i++) {
           
$theta += $thetac;
           
$rad = $radius * ($i / $points);
           
$x = (int) ($rad * cos($theta)) + $x_axis;
           
$y = (int) ($rad * sin($theta)) + $y_axis;
           
$theta += $thetac;
           
$rad1 = $radius * (($i + 1) / $points);
           
$x1 = (int) ($rad1 * cos($theta)) + $x_axis;
           
$y1 = (int) ($rad1 * sin($theta)) + $y_axis;
           
imageline($im, $x, $y, $x1, $y1, $colors['grid']);
           
$theta -= $thetac;
        }

       
// -----------------------------------
        // Write the text
        // -----------------------------------

       
$use_font = ('' !== $font_path && file_exists($font_path) && function_exists('imagettftext'));
        if (
false === $use_font) {
            (
$font_size > 5) && $font_size = 5;
           
$x = mt_rand(0, $img_width / ($length / 3));
           
$y = 0;
        } else {
            (
$font_size > 30) && $font_size = 30;
           
$x = mt_rand(0, $img_width / ($length / 1.5));
           
$y = $font_size + 2;
        }

        for (
$i = 0; $i < $length; $i++) {
            if (
false === $use_font) {
               
$y = mt_rand(0, $img_height / 2);
               
imagestring($im, $font_size, $x, $y, $word[$i], $colors['text']);
               
$x += ($font_size * 2);
            } else {
               
$y = mt_rand($img_height / 2, $img_height - 3);
               
imagettftext($im, $font_size, $angle, $x, $y, $colors['text'], $font_path, $word[$i]);
               
$x += $font_size;
            }
        }

       
// Create the border
       
imagerectangle($im, 0, 0, $img_width - 1, $img_height - 1, $colors['border']);

       
// -----------------------------------
        // Generate the image
        // -----------------------------------
       
$img_url = rtrim($img_url, '/').'/';

        if (
function_exists('imagejpeg')) {
           
$img_filename = $now.'.jpg';
           
imagejpeg($im, $img_path.$img_filename);
        } elseif (
function_exists('imagepng')) {
           
$img_filename = $now.'.png';
           
imagepng($im, $img_path.$img_filename);
        } else {
            return
false;
        }

       
$img = '<img '.('' === $img_id ? '' : 'id="'.$img_id.'"').' src="'.$img_url.$img_filename.'" style="width: '.$img_width.'px; height: '.$img_height .'px; border: 0;" alt=" " />';
       
ImageDestroy($im);

        return [
'word' => $word, 'time' => $now, 'image' => $img, 'filename' => $img_filename];
    }
}