mirror of
https://github.com/ithrts/ImoutoIB.git
synced 2025-01-17 16:08:15 +01:00
98 lines
3.1 KiB
PHP
98 lines
3.1 KiB
PHP
<?php
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session_start();
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//
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if (!isset($permitted_chars)) { //allow for changing this in config.php i guess
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$permitted_chars = '1234567ACDEFGHJKLMNPRSRUVWXY';
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}
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function generate_string($input, $strength = 10) {
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$input_length = strlen($input);
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$random_string = '';
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for($i = 0; $i < $strength; $i++) {
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$random_character = $input[mt_rand(0, $input_length - 1)];
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$random_string .= $random_character;
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}
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$random_string = strtolower($random_string);
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return $random_string;
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}
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$string_length = 6;
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$captcha_string = generate_string($permitted_chars, $string_length);
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//$fonts = [__dir__ .'/assets/fonts/sfautomaton-regular.ttf', __dir__ .'/assets/fonts/sfautomaton-oblique.ttf', __dir__ .'/assets/fonts/sfautomaton-bold.ttf', __dir__ .'/assets/fonts/sfautomaton-boldoblique.ttf',];
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$fonts = [__dir__ .'/assets/fonts/atarist8x16systemfont.ttf', __dir__ .'/assets/fonts/atarist8x16systemfont.ttf'];
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$_SESSION['captcha_text'] = $captcha_string;
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$captcha_string = strtoupper($captcha_string); //this shit gets converted to lower in the post.php anyways
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$captcha_width = 198;
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$captcha_height = 50;
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$captcha_image = imagecreatetruecolor($captcha_width, $captcha_height);
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$captcha_bg_color = imagecolorallocate($captcha_image, 249, 249, 249); //#F9F9F9
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imagefill($captcha_image, 0, 0, $captcha_bg_color);
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$black = imagecolorallocate($captcha_image, 0, 0, 0);
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$white = imagecolorallocate($captcha_image, 255, 255, 255);
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$textcolors = [$black, $black];
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//annoying lines
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for ($i = 0; $i < 30; $i++) {
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imagesetthickness($captcha_image, rand(1, 2));
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imagearc(
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$captcha_image,
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rand(1, 300), // x-coordinate of the center.
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rand(1, 300), // y-coordinate of the center.
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rand(1, 200), // The arc width.
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rand(1, 200), // The arc height.
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rand(1, 300), // The arc start angle, in degrees.
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rand(1, 300), // The arc end angle, in degrees.
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(rand(0, 1) ? $black : $white) // A color identifier.
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);
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}
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//noise background
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$color1 = imagecolorallocate($captcha_image,0,0,0);
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$color2 = imagecolorallocate($captcha_image,0,0,0);
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for($i = 0; $i < $captcha_width; $i++) {
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if ($i % 2 == 0) {
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continue;
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}
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for($j = 0; $j < $captcha_height; $j++) {
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if ($j % 3 == 0) {
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continue;
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}
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if (mt_rand(0,1) == 1) imagesetpixel($captcha_image, $i, $j, $color2);
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}
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}
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//text
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for($i = 0; $i < $string_length; $i++) {
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$letter_space = 170/$string_length;
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$initial = 15;
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imagettftext($captcha_image, 30, rand(-15, 15), $initial + $i*$letter_space, rand(35, 45), $textcolors[rand(0, 1)], $fonts[array_rand($fonts)], $captcha_string[$i]);
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}
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//noise foreground
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$color1 = imagecolorallocate($captcha_image, 200, 240, 242);
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$color2 = imagecolorallocate($captcha_image,220,220,220);
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for($i = 0; $i < $captcha_width; $i++) {
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if ($i % 2 == 0) {
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continue;
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}
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for($j = 0; $j < $captcha_height; $j++) {
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if ($j % 3 == 0) {
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continue;
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}
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if (mt_rand(0,1) == 1) imagesetpixel($captcha_image, $i, $j, $color2);
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}
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}
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header('Content-type: image/png');
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imagepng($captcha_image);
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imagedestroy($captcha_image);
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?>
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