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|
<?php
if(
isset($_GET["v"]) === false ||
is_array($_GET["v"]) === true ||
preg_match(
'/^c[0-9]+\.[A-Za-z0-9_]{20}$/',
$_GET["v"]
) === 0
){
http_response_code(401);
header("Content-Type: text/plain");
echo "Fuck my feathered cloaca";
die();
}
//header("Content-Type: image/jpeg");
include "data/config.php";
if(config::BOT_PROTECTION !== 1){
header("Content-Type: text/plain");
echo "The IQ test is disabled";
die();
}
$grid = apcu_fetch($_GET["v"]);
if($grid !== false){
// captcha already generated
http_response_code(304); // not modified
die();
}
header("Content-Type: image/jpeg");
header("Last-Modified: Thu, 01 Oct 1970 00:00:00 GMT");
// ** generate captcha data
// get the positions for the answers
// will return between 3 and 6 answer positions
$range = range(0, 15);
$answer_pos = [];
array_splice($range, 0, 1);
$picks = random_int(3, 6);
for($i=0; $i<$picks; $i++){
$answer_pos_tmp =
array_splice(
$range,
random_int(
0,
14 - $i
),
1
);
$answer_pos[] = $answer_pos_tmp[0];
}
// choose a dataset
$c = count(config::CAPTCHA_DATASET);
$choosen = config::CAPTCHA_DATASET[random_int(0, $c - 1)];
$choices = [];
for($i=0; $i<$c; $i++){
if(config::CAPTCHA_DATASET[$i][0] == $choosen[0]){
continue;
}
$choices[] = config::CAPTCHA_DATASET[$i];
}
// generate grid data
$grid = [];
for($i=0; $i<16; $i++){
if(in_array($i, $answer_pos)){
$grid[] = $choosen;
}else{
$grid[] = $choices[random_int(0, count($choices) - 1)];
}
}
// store grid data for form validation on captcha_gen.php
apcu_store(
$_GET["v"],
$answer_pos,
60 // we give user 1 minute 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, 427, $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/" . $grid[$i][0] . "/" . random_int(1, $grid[$i][1]) . ".png");
// convert transparency correctly
$tmp->setImageBackgroundColor("black");
$tmp->setImageAlphaChannel(Imagick::ALPHACHANNEL_REMOVE);
// randomly mirror
if(random_int(0,1) === 1){
$tmp->flopImage();
}
// 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
);
$tmp->addNoiseImage($noise[random_int(0, 1)]);
// append image
$im->compositeImage($tmp->getImage(), Imagick::COMPOSITE_DEFAULT, $x * 100, ($y * 100) + 27);
$i++;
}
}
// add text
$draw = new ImagickDraw();
$draw->setFontSize(20);
$draw->setFillColor($theme["fg"]);
//$draw->setTextAntialias(false);
$draw->setFont("./data/captcha/font.ttf");
$text = "Pick " . $picks . " images of " . str_replace("_", " ", $choosen[0]);
$pos = 200 - ($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);
echo $im->getImageBlob();
|
