148 lines
2.6 KiB
PHP
Executable File
148 lines
2.6 KiB
PHP
Executable File
<?php
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if(
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!isset($_GET["k"]) ||
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preg_match(
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'/^c\.[0-9]+$/',
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$_GET["k"]
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)
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){
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header("Content-Type: text/plain");
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echo "Fuck you";
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die();
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}
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header("Content-Type: image/jpeg");
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$grid = apcu_fetch($_GET["k"]);
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if(
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$grid === false ||
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$grid[3] === true // has already been generated
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){
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http_response_code(304); // not modified
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die();
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}
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header("Last-Modified: Thu, 01 Oct 1970 00:00:00 GMT");
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// only generate one captcha with this config
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apcu_store(
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$_GET["k"],
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[
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$grid[0],
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$grid[1],
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$grid[2],
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true // has captcha been generated?
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],
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120 // we give user another 2 minutes to solve
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);
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// generate image
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if(random_int(0,1) === 0){
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$theme = [
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"bg" => "#ebdbb2",
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"fg" => "#1d2021"
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];
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}else{
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$theme = [
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"bg" => "#1d2021",
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"fg" => "#ebdbb2"
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];
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}
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$im = new Imagick();
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$im->newImage(400, 400, $theme["bg"]);
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$im->setImageBackgroundColor($theme["bg"]);
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$im->setImageFormat("jpg");
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$noise = [
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imagick::NOISE_GAUSSIAN,
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imagick::NOISE_LAPLACIAN
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];
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$distort = [
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imagick::DISTORTION_AFFINE,
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imagick::DISTORTION_SHEPARDS
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];
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$i = 0;
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for($y=0; $y<4; $y++){
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for($x=0; $x<4; $x++){
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$tmp = new Imagick("./data/captcha/" . $grid[0][$i][0] . "/" . random_int(1, $grid[0][$i][1]) . ".png");
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// convert transparency correctly
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$tmp->setImageBackgroundColor("black");
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$tmp->setImageAlphaChannel(Imagick::ALPHACHANNEL_REMOVE);
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// distort $tmp
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$tmp->distortImage(
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$distort[random_int(0,1)],
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[
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0, 0,
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random_int(-15, 15), random_int(-15, 15),
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100, 0,
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random_int(80, 120), random_int(-15, 15),
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100, 100,
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random_int(80, 120), random_int(80, 120),
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0, 100,
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random_int(-15, 15), random_int(80, 120)
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],
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false
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);
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// append image
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$im->compositeImage($tmp->getImage(), Imagick::COMPOSITE_DEFAULT, $x * 100, $y * 100);
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$i++;
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}
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}
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// add noise
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$im->addNoiseImage($noise[random_int(0, 1)]);
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// expand top of image
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$im->setImageGravity(Imagick::GRAVITY_SOUTH);
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$im->chopImage(0, -27, 400, 400);
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$im->extentImage(0, 0, 0, -27);
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// add text
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$draw = new ImagickDraw();
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$draw->setFontSize(20);
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$draw->setFillColor($theme["fg"]);
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//$draw->setTextAntialias(false);
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$draw->setFont("./data/captcha/font.ttf");
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$text = "Pick " . $grid[1] . " images of " . str_replace("_", " ", $grid[2]);
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$pos = 200 - ($im->queryFontMetrics($draw, $text)["textWidth"] / 2);
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for($i=0; $i<strlen($text); $i++){
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$im->annotateImage(
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$draw,
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$pos,
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20,
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random_int(-15, 15),
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$text[$i]
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);
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$pos += $im->queryFontMetrics($draw, $text[$i])["textWidth"];
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}
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$im->setFormat("jpeg");
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$im->setImageCompressionQuality(90);
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$im->setImageCompression(Imagick::COMPRESSION_JPEG2000);
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echo $im->getImageBlob();
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