mirror of
https://github.com/vichan-devel/vichan.git
synced 2024-11-24 07:30:10 +01:00
358 lines
8.6 KiB
PHP
358 lines
8.6 KiB
PHP
<?php
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class CzaksCaptcha {
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var $content = array();
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var $width, $height, $color, $charset, $style;
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function __construct($text, $left, $top, $charset=false) {
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if (!$charset) {
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$charset = 'abcdefghijklmnopqrstuvwxyz';
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}
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$len = mb_strlen($text, 'utf-8');
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$this->width = $left;
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$this->height = $top;
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$this->charset = preg_split('//u', $charset);
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$this->style = "";
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for ($i = 0; $i < $len; $i++) {
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$this->content[] = array(mb_substr($text, $i, 1, 'utf-8'), "top" => $top / 2 - $top / 4,
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"left" => $left/10 + 9*$left*$i/10/$len,
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"position" => "absolute");
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}
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$this->color = "hsla(".rand(1,360).", 76%, 78%, 1)";
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$this->add_junk();
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$this->mutate_sizes();
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$this->mutate_positions();
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$this->mutate_transform();
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$this->mutate_anchors();
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$this->randomize();
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$this->mutate_containers();
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$this->mutate_margins();
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$this->mutate_styles();
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$this->randomize();
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}
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function mutate_sizes() {
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foreach ($this->content as &$v) {
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if (!isset ($v['font-size']))
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$v['font-size'] = rand($this->height/3 - 4, $this->height/3 + 8);
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}
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}
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function mutate_positions() {
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foreach ($this->content as &$v) {
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$v['top'] += rand(-10,10);
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$v['left'] += rand(-10,10);
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}
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}
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function mutate_transform() {
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$fromto = array('6'=>'9', '9'=>'6', '8'=>'8', '0'=>'0',
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'z'=>'z', 's'=>'s', 'n'=>'u', 'u'=>'n',
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'a'=>'ɐ', 'e'=>'ə', 'p'=>'d', 'd'=>'p',
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'A'=>'∀', 'E'=>'∃', 'H'=>'H', 'o'=>'o',
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'O'=>'O');
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foreach ($this->content as &$v) {
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$basefrom = -20;
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$baseto = 20;
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if (isset($fromto[$v[0]]) && rand(0,1)) {
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$v[0] = $fromto[$v[0]];
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$basefrom = 160;
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$baseto = 200;
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}
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$v['transform'] = 'rotate('.rand($basefrom,$baseto).'deg)';
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$v['-ms-transform'] = 'rotate('.rand($basefrom,$baseto).'deg)';
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$v['-webkit-transform'] = 'rotate('.rand($basefrom,$baseto).'deg)';
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}
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}
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function randomize(&$a = false) {
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if ($a === false) {
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$a = &$this->content;
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}
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shuffle($a);
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foreach ($a as &$v) {
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$this->shuffle_assoc($v);
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if (is_array ($v[0])) {
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$this->randomize($v[0]);
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}
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}
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}
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function add_junk() {
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$count = rand(200, 300);
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while ($count--) {
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$elem = array();
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$elem['top'] = rand(0, $this->height);
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$elem['left'] = rand(0, $this->width);
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$elem['position'] = 'absolute';
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$elem[0] = $this->charset[rand(0, count($this->charset)-1)];
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switch($t = rand (0,9)) {
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case 0:
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$elem['display'] = 'none'; break;
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case 1:
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$elem['top'] = rand(-60, -90); break;
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case 2:
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$elem['left'] = rand(-40, -70); break;
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case 3:
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$elem['top'] = $this->height + rand(10, 60); break;
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case 4:
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$elem['left'] = $this->width + rand(10, 60); break;
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case 5:
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$elem['color'] = $this->color; break;
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case 6:
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$elem['visibility'] = 'hidden'; break;
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case 7:
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$elem['height'] = rand(0,2);
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$elem['overflow'] = 'hidden'; break;
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case 8:
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$elem['width'] = rand(0,1);
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$elem['overflow'] = 'hidden'; break;
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case 9:
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$elem['font-size'] = rand(2, 6); break;
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}
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$this->content[] = $elem;
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}
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}
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function mutate_anchors() {
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foreach ($this->content as &$elem) {
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if (rand(0,1)) {
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$elem['right'] = $this->width - $elem['left'] - (int)(0.5*$elem['font-size']);
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unset($elem['left']);
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}
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if (rand(0,1)) {
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$elem['bottom'] = $this->height - $elem['top'] - (int)(1.5*$elem['font-size']);
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unset($elem['top']);
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}
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}
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}
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function mutate_containers() {
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for ($i = 0; $i <= 80; $i++) {
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$new = [];
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$new['width'] = rand(0, $this->width*2);
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$new['height'] = rand(0, $this->height*2);
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$new['top'] = rand(-$this->height * 2, $this->height * 2);
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$new['bottom'] = $this->height - ($new['top'] + $new['height']);
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$new['left'] = rand(-$this->width * 2, $this->width * 2);
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$new['right'] = $this->width - ($new['left'] + $new['width']);
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$new['position'] = 'absolute';
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$new[0] = [];
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$cnt = rand(0,10);
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for ($j = 0; $j < $cnt; $j++) {
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$elem = array_pop($this->content);
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if (!$elem) break;
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if (isset($elem['top'])) $elem['top'] -= $new['top'];
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if (isset($elem['bottom'])) $elem['bottom'] -= $new['bottom'];
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if (isset($elem['left'])) $elem['left'] -= $new['left'];
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if (isset($elem['right'])) $elem['right'] -= $new['right'];
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$new[0][] = $elem;
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}
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if (rand (0,1)) unset($new['top']);
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else unset($new['bottom']);
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if (rand (0,1)) unset($new['left']);
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else unset($new['right']);
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$this->content[] = $new;
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shuffle($this->content);
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}
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}
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function mutate_margins(&$a = false) {
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if ($a === false) {
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$a = &$this->content;
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}
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foreach ($a as &$v) {
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$ary = ['top', 'left', 'bottom', 'right'];
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shuffle($ary);
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$cnt = rand(0,4);
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$ary = array_slice($ary, 0, $cnt);
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foreach ($ary as $prop) {
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$margin = rand(-1000, 1000);
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$v['margin-'.$prop] = $margin;
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if (isset($v[$prop])) {
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$v[$prop] -= $margin;
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}
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}
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if (is_array($v[0])) {
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$this->mutate_margins($v[0]);
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}
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}
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}
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function mutate_styles(&$a = false) {
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if ($a === false) {
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$a = &$this->content;
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}
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foreach ($a as &$v) {
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$content = $v[0];
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unset($v[0]);
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$styles = array_splice($v, 0, rand(0, 6));
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$v[0] = $content;
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$id_or_class = rand(0,1);
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$param = $id_or_class ? "id" : "class";
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$prefix = $id_or_class ? "#" : ".";
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$genname = "zz-".base_convert(rand(1,999999999), 10, 36);
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if ($styles || rand(0,1)) {
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$this->style .= $prefix.$genname."{";
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$this->style .= $this->rand_whitespace();
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foreach ($styles as $k => $val) {
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if (is_int($val)) {
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$val = "".$val."px";
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}
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$this->style .= "$k:";
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$this->style .= $this->rand_whitespace();
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$this->style .= "$val;";
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$this->style .= $this->rand_whitespace();
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}
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$this->style .= "}";
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$this->style .= $this->rand_whitespace();
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}
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$v[$param] = $genname;
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if (is_array($v[0])) {
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$this->mutate_styles($v[0]);
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}
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}
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}
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function to_html(&$a = false) {
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$inside = true;
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if ($a === false) {
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if ($this->style) {
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echo "<style type='text/css'>";
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echo $this->style;
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echo "</style>";
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}
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echo "<div style='position: relative; width: ".$this->width."px; height: ".$this->height."px; overflow: hidden; background-color: ".$this->color."'>";
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$a = &$this->content;
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$inside = false;
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}
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foreach ($a as &$v) {
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$letter = $v[0];
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unset ($v[0]);
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echo "<div";
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echo $this->rand_whitespace(1);
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if (isset ($v['id'])) {
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echo "id='$v[id]'";
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echo $this->rand_whitespace(1);
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unset ($v['id']);
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}
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if (isset ($v['class'])) {
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echo "class='$v[class]'";
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echo $this->rand_whitespace(1);
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unset ($v['class']);
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}
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echo "style='";
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foreach ($v as $k => $val) {
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if (is_int($val)) {
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$val = "".$val."px";
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}
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echo "$k:";
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echo $this->rand_whitespace();
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echo "$val;";
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echo $this->rand_whitespace();
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}
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echo "'>";
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echo $this->rand_whitespace();
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if (is_array ($letter)) {
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$this->to_html($letter);
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}
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else {
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echo $letter;
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}
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echo "</div>";
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}
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if (!$inside) {
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echo "</div>";
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}
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}
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function rand_whitespace($r = 0) {
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switch (rand($r,4)) {
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case 0:
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return "";
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case 1:
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return "\n";
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case 2:
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return "\t";
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case 3:
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return " ";
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case 4:
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return " ";
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}
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}
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function shuffle_assoc(&$array) {
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$keys = array_keys($array);
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shuffle($keys);
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foreach($keys as $key) {
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$new[$key] = $array[$key];
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}
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$array = $new;
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return true;
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}
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}
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//$charset = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789卐";
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//(new CzaksCaptcha("hotwheels", 300, 80, $charset))->to_html();
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?>
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