diff options
Diffstat (limited to 'src/captcha.php')
| -rw-r--r-- | src/captcha.php | 151 |
1 files changed, 151 insertions, 0 deletions
diff --git a/src/captcha.php b/src/captcha.php new file mode 100644 index 0000000..d6d2547 --- /dev/null +++ b/src/captcha.php @@ -0,0 +1,151 @@ +<?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 ; +}
\ No newline at end of file |