From cdf958d29333d448f4521f4d2faa2592b58e9b27 Mon Sep 17 00:00:00 2001
From: lolcat <will@lolcat.ca>
Date: Sun, 10 Aug 2025 21:55:15 -0400
Subject: fix wikipedia crash

---
 captcha.php | 203 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 203 insertions(+)
 create mode 100755 captcha.php

(limited to 'captcha.php')

diff --git a/captcha.php b/captcha.php
new file mode 100755
index 0000000..286a277
--- /dev/null
+++ b/captcha.php
@@ -0,0 +1,203 @@
+<?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);
+$draw->setFont("./data/fonts/captcha.ttf");
+
+$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();
-- 
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