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PHP Cross Reference of MyBB 1.8.37 |
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1 <?php 2 /** 3 * MyBB 1.8 4 * Copyright 2014 MyBB Group, All Rights Reserved 5 * 6 * Website: http://www.mybb.com 7 * License: http://www.mybb.com/about/license 8 * 9 */ 10 11 define("IN_MYBB", 1); 12 define("NO_ONLINE", 1); 13 define('THIS_SCRIPT', 'captcha.php'); 14 define("ALLOWABLE_PAGE", 1); 15 16 require_once "./global.php"; 17 18 $img_width = 200; 19 $img_height = 60; 20 21 // The following settings are only used for TTF fonts 22 $min_size = 20; 23 $max_size = 32; 24 25 $min_angle = -30; 26 $max_angle = 30; 27 28 $mybb->input['imagehash'] = $mybb->get_input('imagehash'); 29 if($mybb->input['imagehash']) 30 { 31 $query = $db->simple_select("captcha", "*", "imagehash='".$db->escape_string($mybb->get_input('imagehash'))."' AND used=0", array("limit" => 1)); 32 $regimage = $db->fetch_array($query); 33 if(!$regimage) 34 { 35 exit; 36 } 37 // Mark captcha as used 38 $db->update_query('captcha', array('used' => 1), "imagehash='".$db->escape_string($regimage['imagehash'])."'"); 39 $imagestring = $regimage['imagestring']; 40 } 41 else 42 { 43 exit; 44 } 45 46 $ttf_fonts = array(); 47 48 // We have support for true-type fonts (FreeType 2) 49 if(function_exists("imagefttext")) 50 { 51 // Get a list of the files in the 'catpcha_fonts' directory 52 $ttfdir = @opendir(MYBB_ROOT."inc/captcha_fonts"); 53 if($ttfdir !== false) 54 { 55 while(($file = readdir($ttfdir)) !== false) 56 { 57 // If this file is a ttf file, add it to the list 58 if(is_file(MYBB_ROOT."inc/captcha_fonts/".$file) && get_extension($file) == "ttf") 59 { 60 $ttf_fonts[] = MYBB_ROOT."inc/captcha_fonts/".$file; 61 } 62 } 63 closedir($ttfdir); 64 } 65 } 66 67 // Have one or more TTF fonts in our array, we can use TTF captha's 68 if(count($ttf_fonts) > 0) 69 { 70 $use_ttf = 1; 71 } 72 else 73 { 74 $use_ttf = 0; 75 } 76 77 // Check for GD >= 2, create base image 78 if(gd_version() >= 2) 79 { 80 $im = imagecreatetruecolor($img_width, $img_height); 81 } 82 else 83 { 84 $im = imagecreate($img_width, $img_height); 85 } 86 87 // No GD support, die. 88 if(!$im) 89 { 90 die("No GD support."); 91 } 92 93 // Fill the background with white 94 $bg_color = imagecolorallocate($im, 255, 255, 255); 95 imagefill($im, 0, 0, $bg_color); 96 97 // Draw random circles, squares or lines? 98 $to_draw = rand(0, 2); 99 if($to_draw == 1) 100 { 101 draw_circles($im); 102 } 103 else if($to_draw == 2) 104 { 105 draw_squares($im); 106 } 107 else 108 { 109 draw_lines($im); 110 } 111 112 // Draw dots on the image 113 draw_dots($im); 114 115 // Write the image string to the image 116 draw_string($im, $imagestring); 117 118 // Draw a nice border around the image 119 $border_color = imagecolorallocate($im, 0, 0, 0); 120 imagerectangle($im, 0, 0, $img_width-1, $img_height-1, $border_color); 121 122 // Output the image 123 header("Content-type: image/png"); 124 imagepng($im); 125 imagedestroy($im); 126 127 /** 128 * Draws a random number of lines on the image. 129 * 130 * @param resource $im The image. 131 */ 132 function draw_lines(&$im) 133 { 134 global $img_width, $img_height; 135 136 for($i = 10; $i < $img_width; $i += 10) 137 { 138 $color = imagecolorallocate($im, rand(150, 255), rand(150, 255), rand(150, 255)); 139 imageline($im, $i, 0, $i, $img_height, $color); 140 } 141 for($i = 10; $i < $img_height; $i += 10) 142 { 143 $color = imagecolorallocate($im, rand(150, 255), rand(150, 255), rand(150, 255)); 144 imageline($im, 0, $i, $img_width, $i, $color); 145 } 146 } 147 148 /** 149 * Draws a random number of circles on the image. 150 * 151 * @param resource $im The image. 152 */ 153 function draw_circles(&$im) 154 { 155 global $img_width, $img_height; 156 157 $circles = $img_width*$img_height / 100; 158 for($i = 0; $i <= $circles; ++$i) 159 { 160 $color = imagecolorallocate($im, rand(180, 255), rand(180, 255), rand(180, 255)); 161 $pos_x = rand(1, $img_width); 162 $pos_y = rand(1, $img_height); 163 $circ_width = ceil(rand(1, $img_width)/2); 164 $circ_height = rand(1, $img_height); 165 imagearc($im, $pos_x, $pos_y, $circ_width, $circ_height, 0, rand(200, 360), $color); 166 } 167 } 168 169 /** 170 * Draws a random number of dots on the image. 171 * 172 * @param resource $im The image. 173 */ 174 function draw_dots(&$im) 175 { 176 global $img_width, $img_height; 177 178 $dot_count = $img_width*$img_height/5; 179 for($i = 0; $i <= $dot_count; ++$i) 180 { 181 $color = imagecolorallocate($im, rand(200, 255), rand(200, 255), rand(200, 255)); 182 imagesetpixel($im, rand(0, $img_width), rand(0, $img_height), $color); 183 } 184 } 185 186 /** 187 * Draws a random number of squares on the image. 188 * 189 * @param resource $im The image. 190 */ 191 function draw_squares(&$im) 192 { 193 global $img_width, $img_height; 194 195 $square_count = 30; 196 for($i = 0; $i <= $square_count; ++$i) 197 { 198 $color = imagecolorallocate($im, rand(150, 255), rand(150, 255), rand(150, 255)); 199 $pos_x = rand(1, $img_width); 200 $pos_y = rand(1, $img_height); 201 $sq_width = $sq_height = rand(10, 20); 202 $pos_x2 = $pos_x + $sq_height; 203 $pos_y2 = $pos_y + $sq_width; 204 imagefilledrectangle($im, $pos_x, $pos_y, $pos_x2, $pos_y2, $color); 205 } 206 } 207 208 /** 209 * Writes text to the image. 210 * 211 * @param resource $im The image. 212 * @param string $string The string to be written 213 * 214 * @return bool False if string is empty, true otherwise 215 */ 216 function draw_string(&$im, $string) 217 { 218 global $use_ttf, $min_size, $max_size, $min_angle, $max_angle, $ttf_fonts, $img_height, $img_width; 219 220 if(empty($string)) 221 { 222 return false; 223 } 224 225 $spacing = $img_width / my_strlen($string); 226 $string_length = my_strlen($string); 227 for($i = 0; $i < $string_length; ++$i) 228 { 229 // Using TTF fonts 230 if($use_ttf) 231 { 232 // Select a random font size 233 $font_size = rand($min_size, $max_size); 234 235 // Select a random font 236 $font = array_rand($ttf_fonts); 237 $font = $ttf_fonts[$font]; 238 239 // Select a random rotation 240 $rotation = rand($min_angle, $max_angle); 241 242 // Set the colour 243 $r = rand(0, 200); 244 $g = rand(0, 200); 245 $b = rand(0, 200); 246 $color = imagecolorallocate($im, $r, $g, $b); 247 248 // Fetch the dimensions of the character being added 249 $dimensions = imageftbbox($font_size, $rotation, $font, $string[$i], array()); 250 $string_width = $dimensions[2] - $dimensions[0]; 251 $string_height = $dimensions[3] - $dimensions[5]; 252 253 // Calculate character offsets 254 //$pos_x = $pos_x + $string_width + ($string_width/4); 255 $pos_x = $spacing / 4 + $i * $spacing; 256 $pos_y = ceil(($img_height-$string_height/2)); 257 258 // Draw a shadow 259 $shadow_x = rand(-3, 3) + $pos_x; 260 $shadow_y = rand(-3, 3) + $pos_y; 261 $shadow_color = imagecolorallocate($im, $r+20, $g+20, $b+20); 262 imagefttext($im, $font_size, $rotation, $shadow_x, $shadow_y, $shadow_color, $font, $string[$i], array()); 263 264 // Write the character to the image 265 imagefttext($im, $font_size, $rotation, $pos_x, $pos_y, $color, $font, $string[$i], array()); 266 } 267 else 268 { 269 // Get width/height of the character 270 $string_width = imagefontwidth(5); 271 $string_height = imagefontheight(5); 272 273 // Calculate character offsets 274 $pos_x = $spacing / 4 + $i * $spacing; 275 $pos_y = $img_height / 2 - $string_height -10 + rand(-3, 3); 276 277 // Create a temporary image for this character 278 if(gd_version() >= 2) 279 { 280 $temp_im = imagecreatetruecolor(15, 20); 281 } 282 else 283 { 284 $temp_im = imagecreate(15, 20); 285 } 286 $bg_color = imagecolorallocate($temp_im, 255, 255, 255); 287 imagefill($temp_im, 0, 0, $bg_color); 288 imagecolortransparent($temp_im, $bg_color); 289 290 // Set the colour 291 $r = rand(0, 200); 292 $g = rand(0, 200); 293 $b = rand(0, 200); 294 $color = imagecolorallocate($temp_im, $r, $g, $b); 295 296 // Draw a shadow 297 $shadow_x = rand(-1, 1); 298 $shadow_y = rand(-1, 1); 299 $shadow_color = imagecolorallocate($temp_im, $r+50, $g+50, $b+50); 300 imagestring($temp_im, 5, 1+$shadow_x, 1+$shadow_y, $string[$i], $shadow_color); 301 302 imagestring($temp_im, 5, 1, 1, $string[$i], $color); 303 304 // Copy to main image 305 imagecopyresized($im, $temp_im, $pos_x, $pos_y, 0, 0, 40, 55, 15, 20); 306 imagedestroy($temp_im); 307 } 308 } 309 return true; 310 } 311
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