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