danwin1210/le-chat-php
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Change simple and moderate captchas so that characters are no longer in

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fixed positions. Also avoid using fixed colours. In the moderate captcha,
use filled, blurred rectangles instead of dots and lines to obscure the
solution. In setup page, remove deprecation from both captchas.
This commit is contained in:
Daniel Winzen
2025-09-05 10:43:01 +02:00
parent 34655f82b9
commit 47d63a30d1
1 changed files with 27 additions and 24 deletions
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51
chat.php
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@@ -677,29 +677,34 @@ function send_captcha(): void
} else { } else {
echo _('Type the characters in the image:'); echo _('Type the characters in the image:');
} }
if($difficulty===1){ if($difficulty===1 || $difficulty===2){
$im=imagecreatetruecolor(55, 24); $fontwidth = imagefontwidth(5);
$bg=imagecolorallocate($im, 0, 0, 0); $fontheight = imagefontheight(5);
$fg=imagecolorallocate($im, 255, 255, 255); $CAPTCHAWIDTH = $fontwidth * 5 * 3;
$CAPTCHAHEIGHT = $fontheight * 3;
$im=imagecreatetruecolor($CAPTCHAWIDTH, $CAPTCHAHEIGHT);
$bg=imagecolorallocate($im, mt_rand(0, 255), mt_rand(0, 255), mt_rand(0, 255));
imagefill($im, 0, 0, $bg); imagefill($im, 0, 0, $bg);
imagestring($im, 5, 5, 5, $code, $fg); $margins = 0;
echo '<img alt="" width="55" height="24" src="data:image/png;base64,'; if($difficulty===2){
}elseif($difficulty===2){ for($i=0; $i<5; $i++){
$im=imagecreatetruecolor(55, 24); for($j=0; $j<2; $j++){
$bg=imagecolorallocate($im, 0, 0, 0); imagefilledrectangle($im, mt_rand($i * $CAPTCHAWIDTH / 5, ($i + 1) * $CAPTCHAWIDTH / 5), mt_rand(0, $CAPTCHAHEIGHT), mt_rand(($i + 0.5) * $CAPTCHAWIDTH / 5, ($i + 1.5) * $CAPTCHAWIDTH / 5), mt_rand(0, $CAPTCHAHEIGHT), imagecolorallocate($im, mt_rand(128, 255), mt_rand(128, 255), mt_rand(128, 255)));
$fg=imagecolorallocate($im, 255, 255, 255); }
imagefill($im, 0, 0, $bg); }
imagestring($im, 5, 5, 5, $code, $fg);
$line=imagecolorallocate($im, 255, 255, 255);
for($i=0;$i<2;++$i){
imageline($im, 0, mt_rand(0, 24), 55, mt_rand(0, 24), $line);
} }
$dots=imagecolorallocate($im, 255, 255, 255); imagefilter($im, IMG_FILTER_SMOOTH, 5);
for($i=0;$i<100;++$i){ $xoffset=0;
imagesetpixel($im, mt_rand(0, 55), mt_rand(0, 24), $dots); for($i=0; $i<5; $i++){
$xoffset+= mt_rand(0, ($CAPTCHAWIDTH - (5 * $fontwidth)) - $xoffset); // randomly shift characters to the right
imagechar($im, 5, $xoffset + $i * $fontwidth, mt_rand(0, $CAPTCHAHEIGHT - $fontheight), $code[$i], imagecolorallocate($im, mt_rand(224, 255), mt_rand(224, 255), mt_rand(224, 255)));
if($difficulty===2){
imagelayereffect($im,IMG_EFFECT_OVERLAY);
}
} }
echo '<img alt="" width="55" height="24" src="data:image/png;base64,';
}elseif($difficulty===3){ // hard }elseif($difficulty===3){ // hard
$CAPTCHAWIDTH=120;
$CAPTCHAHEIGHT=80;
$im=imagecreatetruecolor(55, 24); $im=imagecreatetruecolor(55, 24);
$bg=imagecolorallocatealpha($im, 0, 0, 0, 127); $bg=imagecolorallocatealpha($im, 0, 0, 0, 127);
$fg=imagecolorallocate($im, 255, 255, 255); $fg=imagecolorallocate($im, 255, 255, 255);
@@ -737,7 +742,6 @@ function send_captcha(): void
imagesetpixel($im, mt_rand(0, 120), mt_rand(0, 80), $dots); imagesetpixel($im, mt_rand(0, 120), mt_rand(0, 80), $dots);
} }
imagedestroy($char); imagedestroy($char);
echo '<img width="120" height="80" src="data:image/png;base64,';
}elseif($difficulty===4){ // extreme }elseif($difficulty===4){ // extreme
$CAPTCHAWIDTH = 300; $CAPTCHAWIDTH = 300;
$CAPTCHAHEIGHT = 300; $CAPTCHAHEIGHT = 300;
@@ -812,7 +816,6 @@ function send_captcha(): void
$follow=imagecolorallocate($im, mt_rand(10, 255), mt_rand(10, 255), mt_rand(10, 255)); $follow=imagecolorallocate($im, mt_rand(10, 255), mt_rand(10, 255), mt_rand(10, 255));
imageline($im, $chars[$i]['x']+ $fontwidth / 2, $chars[$i]['y']+ $fontheight / 2, $chars[$i+1]['x']+4, $chars[$i+1]['y']+8, IMG_COLOR_STYLED); imageline($im, $chars[$i]['x']+ $fontwidth / 2, $chars[$i]['y']+ $fontheight / 2, $chars[$i+1]['x']+4, $chars[$i+1]['y']+8, IMG_COLOR_STYLED);
} }
echo '<img alt="CAPTCHA" width="' . $CAPTCHAWIDTH . '" height="' . $CAPTCHAHEIGHT . '" src="data:image/png;base64,';
} elseif ($difficulty===5 || $difficulty===6 || $difficulty===7 || $difficulty===8 || $difficulty===9 || $difficulty===10){ // TrueType } elseif ($difficulty===5 || $difficulty===6 || $difficulty===7 || $difficulty===8 || $difficulty===9 || $difficulty===10){ // TrueType
$CAPTCHAWIDTH = 620; $CAPTCHAWIDTH = 620;
$CAPTCHAHEIGHT = 177; $CAPTCHAHEIGHT = 177;
@@ -943,8 +946,8 @@ function send_captcha(): void
} }
} }
} }
echo '<img alt="" width="' . $CAPTCHAWIDTH . '" height="' .$CAPTCHAHEIGHT . '" src="data:image/png;base64,';
} }
echo '<img alt="CAPTCHA" width="' . $CAPTCHAWIDTH . '" height="' . $CAPTCHAHEIGHT . '" src="data:image/png;base64,';
ob_start(); ob_start();
imagepng($im); imagepng($im);
imagedestroy($im); imagedestroy($im);
@@ -1079,12 +1082,12 @@ function send_setup(array $C): void
if($captcha===1){ if($captcha===1){
echo ' selected'; echo ' selected';
} }
echo '>'._('Simple (deprecated)').'</option>'; echo '>'._('Simple').'</option>';
echo '<option value="2"'; echo '<option value="2"';
if($captcha===2){ if($captcha===2){
echo ' selected'; echo ' selected';
} }
echo '>'._('Moderate (deprecated)').'</option>'; echo '>'._('Moderate').'</option>';
echo '<option value="3"'; echo '<option value="3"';
if($captcha===3){ if($captcha===3){
echo ' selected'; echo ' selected';