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<?php
function generate_image_captcha(int $width, int $height, int $difficulty, string $file_name, string $file_folder): string
{
$image = imagecreatetruecolor($width, $height);
$background = imagecolorallocate($image, 0xDD, 0xDD, 0xDD);
imagefilledrectangle($image, 0, 0, $width, $height, $background);
$files = scandir($file_folder);
array_splice($files, 0, 2);
for ($i = 0; $i < 50 * $difficulty; $i++) {
$unprocessed = imagecreatefrompng("$file_folder/" . $files[random_int(0, count($files) - 1)]);
$oldw = imagesx($unprocessed);
$oldh = imagesy($unprocessed);
$w = random_int(round($oldw / 4), round($oldw / 2));
$h = random_int(round($oldh / 4), round($oldh / 2));
$file = imagecreatetruecolor($w, $h);
imagealphablending($file, false);
$transparent = imagecolorallocatealpha($file, 0, 0, 0, 127);
imagefill($file, 0, 0, $transparent);
imagesavealpha($file, true);
imagecopyresampled($file, $unprocessed, 0, 0, 0, 0, $w, $h, $oldw, $oldh);
$angle = random_int(0, 360);
$file = imagerotate($file, $angle, $transparent);
for ($j = 0; $j < random_int(2, 5 * $difficulty); $j++) {
imagefilter($file, IMG_FILTER_GAUSSIAN_BLUR);
}
if (random_int(0, 15) % 3 == 0) {
imagefilter($file, IMG_FILTER_NEGATE);
}
if (random_int(0, 20) % 4 == 0) {
imagefilter($file, IMG_FILTER_PIXELATE, 4);
}
$w = imagesx($file);
$h = imagesy($file);
imagecopy(
$image,
$file,
random_int(0, $width - $w),
random_int(0, $height - $h),
0,
0,
$w,
$h
);
}
$foreground = imagecreatefrompng("$file_folder/$file_name.png");
$transparent = imagecolorallocatealpha($foreground, 0, 0, 0, 127);
$angle = random_int(0, max: 180);
$foreground = imagerotate($foreground, $angle, $transparent);
$w = imagesx($foreground);
$h = imagesy($foreground);
imagecopy(
$image,
$foreground,
random_int(0, $width - $w),
random_int(0, $height - $h),
0,
0,
$w,
$h
);
ob_start();
imagepng($image);
$source = ob_get_contents();
ob_clean();
return "data:image/png;base64," . base64_encode($source);
}
function html_captcha_form()
{
echo '' ?>
<div class="box" id="form-captcha-wrapper" style="display: none;">
<div class="box navtab">
Solve captcha
</div>
<div class="box content">
<noscript>JavaScript is required for captcha!</noscript>
<form id="form-captcha">
<img src="" alt="Generating captcha..." id="form-captcha-img" width="256">
<div class="column small-gap">
<div class="row small-gap">
<input type="text" name="answer" placeholder="Enter emote name..." class="grow"
id="form-captcha-answer">
<button type="submit" class="green" id="form-captcha-solve">Solve</button>
</div>
</div>
</form>
</div>
</div>
<script>
const formElement = document.getElementById("form-captcha");
const formWrapper = document.getElementById("form-captcha-wrapper");
function get_captcha() {
fetch("/captcha.php")
.then((response) => response.json())
.then((json) => {
if (json.data == null) {
formWrapper.style.display = "none";
return;
}
document.getElementById("form-captcha-answer").value = null;
formWrapper.style.display = "flex";
document.getElementById("form-captcha-img").setAttribute("src", json.data);
});
}
get_captcha();
formElement.addEventListener("submit", (e) => {
e.preventDefault();
const answer = document.getElementById("form-captcha-answer");
const body = new FormData(formElement);
fetch("/captcha.php", {
"method": "POST",
"body": body
})
.then((response) => response.json())
.then((json) => {
if (json.status_code == 200 && json.data == null) {
formWrapper.style.display = "none";
return;
}
get_captcha();
});
});
</script>
<?php ;
}
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