204 lines
3.5 KiB
PHP
Executable File
204 lines
3.5 KiB
PHP
Executable File
<?php
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if(
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isset($_GET["v"]) === false ||
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is_array($_GET["v"]) === true ||
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preg_match(
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'/^c[0-9]+\.[A-Za-z0-9_]{20}$/',
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$_GET["v"]
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) === 0
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){
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http_response_code(401);
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header("Content-Type: text/plain");
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echo "Fuck my feathered cloaca";
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die();
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}
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//header("Content-Type: image/jpeg");
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include "data/config.php";
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if(config::BOT_PROTECTION !== 1){
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header("Content-Type: text/plain");
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echo "The IQ test is disabled";
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die();
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}
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$grid = apcu_fetch($_GET["v"]);
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if($grid !== false){
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// captcha already generated
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http_response_code(304); // not modified
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die();
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}
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header("Content-Type: image/jpeg");
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header("Last-Modified: Thu, 01 Oct 1970 00:00:00 GMT");
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// ** generate captcha data
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// get the positions for the answers
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// will return between 3 and 6 answer positions
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$range = range(0, 15);
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$answer_pos = [];
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array_splice($range, 0, 1);
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$picks = random_int(3, 6);
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for($i=0; $i<$picks; $i++){
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$answer_pos_tmp =
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array_splice(
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$range,
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random_int(
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0,
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14 - $i
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),
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1
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);
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$answer_pos[] = $answer_pos_tmp[0];
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}
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// choose a dataset
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$c = count(config::CAPTCHA_DATASET);
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$choosen = config::CAPTCHA_DATASET[random_int(0, $c - 1)];
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$choices = [];
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for($i=0; $i<$c; $i++){
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if(config::CAPTCHA_DATASET[$i][0] == $choosen[0]){
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continue;
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}
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$choices[] = config::CAPTCHA_DATASET[$i];
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}
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// generate grid data
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$grid = [];
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for($i=0; $i<16; $i++){
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if(in_array($i, $answer_pos)){
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$grid[] = $choosen;
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}else{
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$grid[] = $choices[random_int(0, count($choices) - 1)];
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}
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}
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// store grid data for form validation on captcha_gen.php
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apcu_store(
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$_GET["v"],
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$answer_pos,
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60 // we give user 1 minute 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, 427, $theme["bg"]);
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$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/" . $grid[$i][0] . "/" . random_int(1, $grid[$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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// randomly mirror
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if(random_int(0,1) === 1){
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$tmp->flopImage();
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}
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// distort $tmp
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$tmp->distortImage(
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$distort[random_int(0,1)],
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[
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0, 0,
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random_int(-15, 15), random_int(-15, 15),
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100, 0,
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random_int(80, 120), random_int(-15, 15),
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100, 100,
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random_int(80, 120), random_int(80, 120),
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0, 100,
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random_int(-15, 15), random_int(80, 120)
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],
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false
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);
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$tmp->addNoiseImage($noise[random_int(0, 1)]);
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// append image
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$im->compositeImage($tmp->getImage(), Imagick::COMPOSITE_DEFAULT, $x * 100, ($y * 100) + 27);
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$i++;
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}
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}
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// add text
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$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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$draw->setFont("./data/fonts/captcha.ttf");
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$text = "Pick " . $picks . " images of " . str_replace("_", " ", $choosen[0]);
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$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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echo $im->getImageBlob();
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