<?php
/**
* This file is part of Aksara CMS, both framework and publishing
* platform.
*
* @author Aby Dahana <[email protected]>
* @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];
}
}
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