captcha, filtering

new captcha
new zalgo filtering because old one was messing up the format

assets/css/Yotsuba B.css

@@ -147,10 +147,6 @@ div.post video {
 	max-height: 480px;
 }
 
-.post-content, .post-info {
-    overflow: hidden;
-}
-
 p {
 	margin: 0;
 	padding: 0;

assets/fonts/sfautomaton.txt

@@ -0,0 +1 @@
+no fucking clue what the license is for this font

captcha.php

@@ -1,8 +1,11 @@
 <?php
 session_start();
- 
-$permitted_chars = '3456ABCDEFGHJKLMNPQRSRUVWXY';
-  
+
+//
+if (!isset($permitted_chars)) { //allow for changing this in config.php i guess
+  $permitted_chars = '1234567ACDEFGHJKLMNPRSRUVWXY';
+}
+
 function generate_string($input, $strength = 10) {
     $input_length = strlen($input);
     $random_string = '';
@@ -13,48 +16,83 @@ function generate_string($input, $strength = 10) {
     $random_string = strtolower($random_string);
     return $random_string;
 }
- 
-$image = imagecreatetruecolor(200, 50);
- 
-imageantialias($image, true);
- 
-$colors = [];
- 
-$red = rand(125, 175);
-$green = rand(125, 175);
-$blue = rand(125, 175);
- 
-for($i = 0; $i < 5; $i++) {
-  $colors[] = imagecolorallocate($image, $red - 20*$i, $green - 20*$i, $blue - 20*$i);
-}
- 
-imagefill($image, 0, 0, $colors[0]);
- 
-for($i = 0; $i < 10; $i++) {
-  imagesetthickness($image, rand(2, 10));
-  $line_color = $colors[rand(1, 4)];
-  imagerectangle($image, rand(-10, 190), rand(-10, 10), rand(-10, 190), rand(40, 60), $line_color);
-}
- 
-$black = imagecolorallocate($image, 0, 0, 0);
-$white = imagecolorallocate($image, 255, 255, 255);
-$textcolors = [$white, $white];
- 
-$fonts = [__dir__ .'/assets/fonts/captcha0.ttf', __dir__ .'/assets/fonts/captcha0.ttf', __dir__ .'/assets/fonts/captcha0.ttf', __dir__ .'/assets/fonts/captcha0.ttf'];
- 
+
 $string_length = 6;
 $captcha_string = generate_string($permitted_chars, $string_length);
- 
+
+//$fonts = [__dir__ .'/assets/fonts/sfautomaton-regular.ttf', __dir__ .'/assets/fonts/sfautomaton-oblique.ttf', __dir__ .'/assets/fonts/sfautomaton-bold.ttf', __dir__ .'/assets/fonts/sfautomaton-boldoblique.ttf',];
+$fonts = [__dir__ .'/assets/fonts/atarist8x16systemfont.ttf', __dir__ .'/assets/fonts/atarist8x16systemfont.ttf'];
+
 $_SESSION['captcha_text'] = $captcha_string;
- 
+
+$captcha_string = strtoupper($captcha_string); //this shit gets converted to lower in the post.php anyways
+
+
+$captcha_width = 198;
+$captcha_height = 50;
+$captcha_image = imagecreatetruecolor($captcha_width, $captcha_height);
+$captcha_bg_color = imagecolorallocate($captcha_image, 249, 249, 249); //#F9F9F9
+imagefill($captcha_image, 0, 0, $captcha_bg_color);
+
+$black = imagecolorallocate($captcha_image, 0, 0, 0);
+$white = imagecolorallocate($captcha_image, 255, 255, 255);
+$textcolors = [$black, $black];
+
+//annoying lines
+for ($i = 0; $i < 30; $i++) {
+    imagesetthickness($captcha_image, rand(1, 2));
+    imagearc(
+        $captcha_image,
+        rand(1, 300), // x-coordinate of the center.
+        rand(1, 300), // y-coordinate of the center.
+        rand(1, 200), // The arc width.
+        rand(1, 200), // The arc height.
+        rand(1, 300), // The arc start angle, in degrees.
+        rand(1, 300), // The arc end angle, in degrees.
+        (rand(0, 1) ? $black : $white) // A color identifier.
+    );
+}
+
+//noise background
+$color1 = imagecolorallocate($captcha_image,0,0,0);
+$color2 = imagecolorallocate($captcha_image,0,0,0);
+for($i = 0; $i < $captcha_width; $i++) {
+    if ($i % 2 == 0) {
+        continue;
+      }
+    for($j = 0; $j < $captcha_height; $j++) {
+      if ($j % 3 == 0) {
+        continue;
+      }
+        if (mt_rand(0,1) == 1) imagesetpixel($captcha_image, $i, $j, $color2);
+    }
+}
+
+//text
 for($i = 0; $i < $string_length; $i++) {
   $letter_space = 170/$string_length;
-  $initial = 15;
-   
-  imagettftext($image, 24, rand(-15, 15), $initial + $i*$letter_space, rand(25, 45), $textcolors[rand(0, 1)], $fonts[array_rand($fonts)], $captcha_string[$i]);
+  $initial = 15; 
+  imagettftext($captcha_image, 30, rand(-15, 15), $initial + $i*$letter_space, rand(35, 45), $textcolors[rand(0, 1)], $fonts[array_rand($fonts)], $captcha_string[$i]);
 }
- 
+
+//noise foreground
+$color1 = imagecolorallocate($captcha_image, 200, 240, 242);
+$color2 = imagecolorallocate($captcha_image,220,220,220);
+for($i = 0; $i < $captcha_width; $i++) {
+    if ($i % 2 == 0) {
+        continue;
+      }
+    for($j = 0; $j < $captcha_height; $j++) {
+      if ($j % 3 == 0) {
+        continue;
+      }
+        if (mt_rand(0,1) == 1) imagesetpixel($captcha_image, $i, $j, $color2);
+    }
+}
+
+
 header('Content-type: image/png');
-imagepng($image);
-imagedestroy($image);
+imagepng($captcha_image);
+imagedestroy($captcha_image);
+
 ?>

includes/default.php

@@ -134,6 +134,7 @@ $config['reply_body_max'] = 4000; //maximum characters
 $config['max_lines'] = 40;
 
 $config['linkify_urls'] = true; //converts http/https to links
+$config['filter_zalgo'] = true; //you want this, trust me
 $config['wordfilters'][] = array('/little sister/i', 'imouto'); //regex
 
 

post.php

@@ -102,6 +102,14 @@ if (($config['mod']['thread_autosage'] <= $mod_level) && isset($_POST['autosage'
 	$post_subject = phpClean($_POST['subject']);
 	$post_body = phpClean($_POST['body']);
 
+	//filter zalgo from all
+	if ($config['filter_zalgo'] == true) {
+		$post_name = preg_replace("~(?:[\p{M}]{1})([\p{M}])~uis","", $post_name);
+		$post_email = preg_replace("~(?:[\p{M}]{1})([\p{M}])~uis","", $post_email);
+		$post_subject = preg_replace("~(?:[\p{M}]{1})([\p{M}])~uis","", $post_subject);
+		$post_body = preg_replace("~(?:[\p{M}]{1})([\p{M}])~uis","", $post_body);
+	}
+
 
 //CHECK SOME REQS BEFORE BODY EDIT, length. Check newlines after by scanning <br>'s
 //IF NEW REPLY

version

@@ -1 +1 @@
-0.105-dev
+0.106-dev