noalyss
Version-6.7.2
|
Public Member Functions | |
addSignature () | |
Print signature text on image. | |
allocateColors () | |
Allocate all colors that will be used in the CAPTCHA image. | |
check ($code) | |
Validate the code entered by the user. | |
checkCode () | |
Check if the user entered code was correct. | |
clearCodeFromDatabase () | |
Delete a code from the database by ip address hash. | |
createCode () | |
Create a code and save to the session. | |
distortedCopy () | |
Warp text from temporary image onto final image. | |
doImage () | |
Generate and output the image. | |
drawLines () | |
Draw random curvy lines over the image Modified code from HKCaptcha. | |
drawWord () | |
Draw the CAPTCHA code over the image. | |
frand () | |
Generate random number less than 1. | |
generateCode ($len) | |
Generate a code. | |
generateMP3 ($letters) | |
Generate an mp3 file by concatenating individual files. | |
generateWAV ($letters) | |
Generate a wav file by concatenating individual files. | |
getAudibleCode ($format= 'wav') | |
Get WAV or MP3 file data of the spoken code. | |
getBackgroundFromDirectory () | |
Return the full path to a random gif, jpg, or png from the background directory. | |
getCode () | |
Get the captcha code. | |
getCodeFromDatabase () | |
Get stored captcha code from sqlite database based on ip address hash. | |
getIPHash () | |
Get hashed IP address of remote user. | |
isCodeExpired ($creation_time) | |
Check a code to see if it is expired based on creation time. | |
openDatabase () | |
Open SQLite database. | |
output () | |
Output image to the browser. | |
outputAudioFile () | |
Output audio file with HTTP headers to browser. | |
purgeOldCodesFromDatabase () | |
Purge codes over a day old from database. | |
readCodeFromFile () | |
Reads a word list file to get a code. | |
saveCodeToDatabase () | |
Save captcha code to sqlite database. | |
saveData () | |
Save the code in the session. | |
scrambleAudioData (&$data, $format) | |
Randomly modify the audio data to scramble sound and prevent binary recognition. | |
Securimage () | |
Class constructor. | |
setAudioPath ($audio_directory) | |
Set the path to the audio directory. | |
setBackground () | |
Set the background of the CAPTCHA image. | |
show ($background_image="") | |
Generate a code and output the image to the browser. | |
validate () | |
Validate the code to the user code. | |
Data Fields | |
$audio_format | |
$audio_path | |
$background_directory = null | |
$bgimg | |
$charset | |
$code | |
$code_entered | |
$code_length | |
$correct_code | |
$draw_lines_over_text | |
$expiry_time | |
$gd_font_file | |
$gd_font_size | |
$gdbgcolor | |
$gdlinecolor | |
$gdmulticolor | |
$gdsignaturecolor | |
$gdtextcolor | |
$im | |
$image_bg_color | |
$image_height | |
$image_signature | |
$image_type | |
$image_width | |
$iscale | |
$line_color | |
$multi_text_color | |
$num_lines | |
$perturbation | |
$session_name = '' | |
$signature_color | |
$sqlite_database | |
$sqlite_handle | |
$text_angle_maximum | |
$text_angle_minimum | |
$text_color | |
$text_transparency_percentage | |
$text_x_start | |
$tmpimg | |
$ttf_file | |
$use_gd_font | |
$use_multi_text | |
$use_sqlite_db | |
Use an SQLite database for storing codes as a backup to sessions. | |
$use_transparent_text | |
$use_wordlist = false | |
$wordlist_file |
Definition at line 107 of file securimage.php.
Print signature text on image.
Definition at line 1357 of file securimage.php.
References image_height, image_signature, and image_width.
Referenced by doImage().
{ if ($this->use_gd_font) { imagestring($this->im, 5, $this->image_width - (strlen($this->image_signature) * 10), $this->image_height - 20, $this->image_signature, $this->gdsignaturecolor); } else { $bbox = imagettfbbox(10, 0, $this->signature_font, $this->image_signature); $textlen = $bbox[2] - $bbox[0]; $x = $this->image_width - $textlen - 5; $y = $this->image_height - 3; imagettftext($this->im, 10, 0, $x, $y, $this->gdsignaturecolor, $this->signature_font, $this->image_signature); } }
Allocate all colors that will be used in the CAPTCHA image.
Definition at line 692 of file securimage.php.
References image_bg_color, line_color, multi_text_color, signature_color, text_color, text_transparency_percentage, use_multi_text, and use_transparent_text.
Referenced by doImage().
{ // allocate bg color first for imagecreate $this->gdbgcolor = imagecolorallocate($this->im, $this->image_bg_color->r, $this->image_bg_color->g, $this->image_bg_color->b); $alpha = intval($this->text_transparency_percentage / 100 * 127); if ($this->use_transparent_text == true) { $this->gdtextcolor = imagecolorallocatealpha($this->im, $this->text_color->r, $this->text_color->g, $this->text_color->b, $alpha); $this->gdlinecolor = imagecolorallocatealpha($this->im, $this->line_color->r, $this->line_color->g, $this->line_color->b, $alpha); } else { $this->gdtextcolor = imagecolorallocate($this->im, $this->text_color->r, $this->text_color->g, $this->text_color->b); $this->gdlinecolor = imagecolorallocate($this->im, $this->line_color->r, $this->line_color->g, $this->line_color->b); } $this->gdsignaturecolor = imagecolorallocate($this->im, $this->signature_color->r, $this->signature_color->g, $this->signature_color->b); if ($this->use_multi_text == true) { $this->gdmulticolor = array(); foreach($this->multi_text_color as $color) { if ($this->use_transparent_text == true) { $this->gdmulticolor[] = imagecolorallocatealpha($this->im, $color->r, $color->g, $color->b, $alpha); } else { $this->gdmulticolor[] = imagecolorallocate($this->im, $color->r, $color->g, $color->b); } } } }
Securimage::check | ( | $ | code | ) |
Validate the code entered by the user.
$code = $_POST['code']; if ($securimage->check($code) == false) { die("Sorry, the code entered did not match."); } else { $valid = true; }
string | $code | The code the user entered |
Definition at line 605 of file securimage.php.
References $code, and validate().
Check if the user entered code was correct.
private
Definition at line 1196 of file securimage.php.
{
return $this->correct_code;
}
Delete a code from the database by ip address hash.
private
Definition at line 1467 of file securimage.php.
References getIPHash().
Referenced by validate().
{ if ($this->sqlite_handle !== false) { $ip = $this->getIPHash(); sqlite_query($this->sqlite_handle, "DELETE FROM codes WHERE iphash = '$ip'"); } }
Create a code and save to the session.
private
Definition at line 978 of file securimage.php.
References code_length, generateCode(), readCodeFromFile(), saveData(), and use_wordlist.
Referenced by doImage(), and getAudibleCode().
{ $this->code = false; if ($this->use_wordlist && is_readable($this->wordlist_file)) { $this->code = $this->readCodeFromFile(); } if ($this->code == false) { $this->code = $this->generateCode($this->code_length); } $this->saveData(); }
Warp text from temporary image onto final image.
Modified for securimage
private
Definition at line 918 of file securimage.php.
References $r, $rad, $tmp, frand(), image_height, image_width, and perturbation.
Referenced by doImage().
{ $numpoles = 3; // distortion factor // make array of poles AKA attractor points for ($i = 0; $i < $numpoles; ++$i) { $px[$i] = rand($this->image_width * 0.3, $this->image_width * 0.7); $py[$i] = rand($this->image_height * 0.3, $this->image_height * 0.7); $rad[$i] = rand($this->image_width * 0.4, $this->image_width * 0.7); $tmp = -$this->frand() * 0.15 - 0.15; $amp[$i] = $this->perturbation * $tmp; } $bgCol = imagecolorat($this->tmpimg, 0, 0); $width2 = $this->iscale * $this->image_width; $height2 = $this->iscale * $this->image_height; imagepalettecopy($this->im, $this->tmpimg); // copy palette to final image so text colors come across // loop over $img pixels, take pixels from $tmpimg with distortion field for ($ix = 0; $ix < $this->image_width; ++$ix) { for ($iy = 0; $iy < $this->image_height; ++$iy) { $x = $ix; $y = $iy; for ($i = 0; $i < $numpoles; ++$i) { $dx = $ix - $px[$i]; $dy = $iy - $py[$i]; if ($dx == 0 && $dy == 0) continue; $r = sqrt($dx * $dx + $dy * $dy); if ($r > $rad[$i]) continue; $rscale = $amp[$i] * sin(3.14 * $r / $rad[$i]); $x += $dx * $rscale; $y += $dy * $rscale; } $c = $bgCol; $x *= $this->iscale; $y *= $this->iscale; if ($x >= 0 && $x < $width2 && $y >= 0 && $y < $height2) { $c = imagecolorat($this->tmpimg, $x, $y); } if ($c != $bgCol) { // only copy pixels of letters to preserve any background image imagesetpixel($this->im, $ix, $iy, $c); } } } }
Generate and output the image.
private
Definition at line 652 of file securimage.php.
References addSignature(), allocateColors(), bgimg, createCode(), distortedCopy(), drawLines(), drawWord(), image_height, image_signature, image_width, num_lines, output(), setBackground(), trim(), and use_transparent_text.
Referenced by show().
{ if ($this->use_gd_font == true) { $this->iscale = 1; } if($this->use_transparent_text == true || $this->bgimg != "") { $this->im = imagecreatetruecolor($this->image_width, $this->image_height); $this->tmpimg = imagecreatetruecolor($this->image_width * $this->iscale, $this->image_height * $this->iscale); } else { //no transparency $this->im = imagecreate($this->image_width, $this->image_height); $this->tmpimg = imagecreate($this->image_width * $this->iscale, $this->image_height * $this->iscale); } $this->allocateColors(); imagepalettecopy($this->tmpimg, $this->im); $this->setBackground(); $this->createCode(); if (!$this->draw_lines_over_text && $this->num_lines > 0) $this->drawLines(); $this->drawWord(); if ($this->use_gd_font == false && is_readable($this->ttf_file)) $this->distortedCopy(); if ($this->draw_lines_over_text && $this->num_lines > 0) $this->drawLines(); if (trim($this->image_signature) != '') $this->addSignature(); $this->output(); }
Draw random curvy lines over the image
Modified code from HKCaptcha.
Definition at line 795 of file securimage.php.
References $line, $step, $w, frand(), image_height, image_width, and num_lines.
Referenced by doImage().
{ for ($line = 0; $line < $this->num_lines; ++$line) { $x = $this->image_width * (1 + $line) / ($this->num_lines + 1); $x += (0.5 - $this->frand()) * $this->image_width / $this->num_lines; $y = rand($this->image_height * 0.1, $this->image_height * 0.9); $theta = ($this->frand()-0.5) * M_PI * 0.7; $w = $this->image_width; $len = rand($w * 0.4, $w * 0.7); $lwid = rand(0, 2); $k = $this->frand() * 0.6 + 0.2; $k = $k * $k * 0.5; $phi = $this->frand() * 6.28; $step = 0.5; $dx = $step * cos($theta); $dy = $step * sin($theta); $n = $len / $step; $amp = 1.5 * $this->frand() / ($k + 5.0 / $len); $x0 = $x - 0.5 * $len * cos($theta); $y0 = $y - 0.5 * $len * sin($theta); $ldx = round(-$dy * $lwid); $ldy = round($dx * $lwid); for ($i = 0; $i < $n; ++$i) { $x = $x0 + $i * $dx + $amp * $dy * sin($k * $i * $step + $phi); $y = $y0 + $i * $dy - $amp * $dx * sin($k * $i * $step + $phi); imagefilledrectangle($this->im, $x, $y, $x + $lwid, $y + $lwid, $this->gdlinecolor); } } }
Draw the CAPTCHA code over the image.
private
Definition at line 835 of file securimage.php.
References image_height, image_width, multi_text_color, text_angle_maximum, text_angle_minimum, and use_multi_text.
Referenced by doImage().
{ $width2 = $this->image_width * $this->iscale; $height2 = $this->image_height * $this->iscale; if ($this->use_gd_font == true || !is_readable($this->ttf_file)) { if (!is_int($this->gd_font_file)) { //is a file name $font = @imageloadfont($this->gd_font_file); if ($font == false) { trigger_error("Failed to load GD Font file {$this->gd_font_file} ", E_USER_WARNING); return; } } else { //gd font identifier $font = $this->gd_font_file; } imagestring($this->im, $font, $this->text_x_start, ($this->image_height / 2) - ($this->gd_font_size / 2), $this->code, $this->gdtextcolor); } else { //ttf font $font_size = $height2 * .35; $bb = imagettfbbox($font_size, 0, $this->ttf_file, $this->code); $tx = $bb[4] - $bb[0]; $ty = $bb[5] - $bb[1]; $x = floor($width2 / 2 - $tx / 2 - $bb[0]); $y = round($height2 / 2 - $ty / 2 - $bb[1]); $strlen = strlen($this->code); if (!is_array($this->multi_text_color)) $this->use_multi_text = false; if ($this->use_multi_text == false && $this->text_angle_minimum == 0 && $this->text_angle_maximum == 0) { // no angled or multi-color characters imagettftext($this->tmpimg, $font_size, 0, $x, $y, $this->gdtextcolor, $this->ttf_file, $this->code); } else { for($i = 0; $i < $strlen; ++$i) { $angle = rand($this->text_angle_minimum, $this->text_angle_maximum); $y = rand($y - 5, $y + 5); if ($this->use_multi_text == true) { $font_color = $this->gdmulticolor[rand(0, sizeof($this->gdmulticolor) - 1)]; } else { $font_color = $this->gdtextcolor; } $ch = $this->code{$i}; imagettftext($this->tmpimg, $font_size, $angle, $x, $y, $font_color, $this->ttf_file, $ch); // estimate character widths to increment $x without creating spaces that are too large or too small // these are best estimates to align text but may vary between fonts // for optimal character widths, do not use multiple text colors or character angles and the complete string will be written by imagettftext if (strpos('abcdeghknopqsuvxyz', $ch) !== false) { $min_x = $font_size - ($this->iscale * 6); $max_x = $font_size - ($this->iscale * 6); } else if (strpos('ilI1', $ch) !== false) { $min_x = $font_size / 5; $max_x = $font_size / 3; } else if (strpos('fjrt', $ch) !== false) { $min_x = $font_size - ($this->iscale * 12); $max_x = $font_size - ($this->iscale * 12); } else if ($ch == 'wm') { $min_x = $font_size; $max_x = $font_size + ($this->iscale * 3); } else { // numbers, capitals or unicode $min_x = $font_size + ($this->iscale * 2); $max_x = $font_size + ($this->iscale * 5); } $x += rand($min_x, $max_x); } //for loop } // angled or multi-color } //else ttf font //$this->im = $this->tmpimg; //$this->output(); } //function
Generate random number less than 1.
Definition at line 1345 of file securimage.php.
Referenced by distortedCopy(), and drawLines().
{
return 0.0001*rand(0,9999);
}
Securimage::generateCode | ( | $ | len | ) |
Generate a code.
private
int | $len | The code length |
Definition at line 1000 of file securimage.php.
References $code.
Referenced by createCode().
Securimage::generateMP3 | ( | $ | letters | ) |
Generate an mp3 file by concatenating individual files.
array | $letters | Array of letters to build a file from |
Definition at line 1317 of file securimage.php.
References $data, $filename, $letter, and scrambleAudioData().
Referenced by getAudibleCode().
{ $data_len = 0; $files = array(); $out_data = ''; foreach ($letters as $letter) { $filename = $this->audio_path . strtoupper($letter) . '.mp3'; $fp = fopen($filename, 'rb'); $data = fread($fp, filesize($filename)); // read file in $this->scrambleAudioData($data, 'mp3'); $out_data .= $data; fclose($fp); } return $out_data; }
Securimage::generateWAV | ( | $ | letters | ) |
Generate a wav file by concatenating individual files.
array | $letters | Array of letters to build a file from |
Definition at line 1209 of file securimage.php.
References $data, $file, $filename, $header, $letter, and scrambleAudioData().
Referenced by getAudibleCode().
{ $data_len = 0; $files = array(); $out_data = ''; foreach ($letters as $letter) { $filename = $this->audio_path . strtoupper($letter) . '.wav'; $fp = fopen($filename, 'rb'); $file = array(); $data = fread($fp, filesize($filename)); // read file in $header = substr($data, 0, 36); $body = substr($data, 44); $data = unpack('NChunkID/VChunkSize/NFormat/NSubChunk1ID/VSubChunk1Size/vAudioFormat/vNumChannels/VSampleRate/VByteRate/vBlockAlign/vBitsPerSample', $header); $file['sub_chunk1_id'] = $data['SubChunk1ID']; $file['bits_per_sample'] = $data['BitsPerSample']; $file['channels'] = $data['NumChannels']; $file['format'] = $data['AudioFormat']; $file['sample_rate'] = $data['SampleRate']; $file['size'] = $data['ChunkSize'] + 8; $file['data'] = $body; if ( ($p = strpos($file['data'], 'LIST')) !== false) { // If the LIST data is not at the end of the file, this will probably break your sound file $info = substr($file['data'], $p + 4, 8); $data = unpack('Vlength/Vjunk', $info); $file['data'] = substr($file['data'], 0, $p); $file['size'] = $file['size'] - (strlen($file['data']) - $p); } $files[] = $file; $data = null; $header = null; $body = null; $data_len += strlen($file['data']); fclose($fp); } $out_data = ''; for($i = 0; $i < sizeof($files); ++$i) { if ($i == 0) { // output header $out_data .= pack('C4VC8', ord('R'), ord('I'), ord('F'), ord('F'), $data_len + 36, ord('W'), ord('A'), ord('V'), ord('E'), ord('f'), ord('m'), ord('t'), ord(' ')); $out_data .= pack('VvvVVvv', 16, $files[$i]['format'], $files[$i]['channels'], $files[$i]['sample_rate'], $files[$i]['sample_rate'] * (($files[$i]['bits_per_sample'] * $files[$i]['channels']) / 8), ($files[$i]['bits_per_sample'] * $files[$i]['channels']) / 8, $files[$i]['bits_per_sample'] ); $out_data .= pack('C4', ord('d'), ord('a'), ord('t'), ord('a')); $out_data .= pack('V', $data_len); } $out_data .= $files[$i]['data']; } $this->scrambleAudioData($out_data, 'wav'); return $out_data; }
Securimage::getAudibleCode | ( | $ | format = 'wav' | ) |
Get WAV or MP3 file data of the spoken code.
This is appropriate for output to the browser as audio/x-wav or audio/mpeg
Definition at line 1086 of file securimage.php.
References $code, createCode(), generateMP3(), generateWAV(), and getCode().
Referenced by outputAudioFile().
{ $letters = array(); $code = $this->getCode(); if ($code == '') { $this->createCode(); $code = $this->getCode(); } for($i = 0; $i < strlen($code); ++$i) { $letters[] = $code{$i}; } if ($format == 'mp3') { return $this->generateMP3($letters); } else { return $this->generateWAV($letters); } }
Return the full path to a random gif, jpg, or png from the background directory.
private
Definition at line 768 of file securimage.php.
References $file, and background_directory.
Referenced by setBackground().
{ $images = array(); if ($dh = opendir($this->background_directory)) { while (($file = readdir($dh)) !== false) { if (preg_match('/(jpg|gif|png)$/i', $file)) $images[] = $file; } closedir($dh); if (sizeof($images) > 0) { return rtrim($this->background_directory, '/') . '/' . $images[rand(0, sizeof($images)-1)]; } } return false; }
Get the captcha code.
Definition at line 1179 of file securimage.php.
References getCodeFromDatabase(), and openDatabase().
Referenced by getAudibleCode().
{ if (isset($_SESSION['securimage_code_value']) && !empty($_SESSION['securimage_code_value'])) { return strtolower($_SESSION['securimage_code_value']); } else { if ($this->sqlite_handle == false) $this->openDatabase(); return $this->getCodeFromDatabase(); // attempt to get from database, returns empty string if sqlite is not available or disabled } }
Get stored captcha code from sqlite database based on ip address hash.
private
Definition at line 1441 of file securimage.php.
References $code, $res, getIPHash(), and isCodeExpired().
Referenced by getCode(), and validate().
{ $code = ''; if ($this->use_sqlite_db && $this->sqlite_handle !== false) { $ip = $this->getIPHash(); $res = sqlite_query($this->sqlite_handle, "SELECT * FROM codes WHERE iphash = '$ip'"); if ($res && sqlite_num_rows($res) > 0) { $res = sqlite_fetch_array($res); if ($this->isCodeExpired($res['created']) == false) { $code = $res['code']; } } } return $code; }
Get hashed IP address of remote user.
private
Definition at line 1379 of file securimage.php.
Referenced by clearCodeFromDatabase(), getCodeFromDatabase(), and saveCodeToDatabase().
{ return strtolower(md5($_SERVER['REMOTE_ADDR'])); }
Securimage::isCodeExpired | ( | $ | creation_time | ) |
Check a code to see if it is expired based on creation time.
private
$creation_time | unix timestamp of code creation time |
Definition at line 1500 of file securimage.php.
Referenced by getCodeFromDatabase(), and validate().
{ $expired = true; if (!is_numeric($this->expiry_time) || $this->expiry_time < 1) { $expired = false; } else if (time() - $creation_time < $this->expiry_time) { $expired = false; } return $expired; }
Open SQLite database.
private
Definition at line 1391 of file securimage.php.
References $res.
Referenced by getCode(), saveCodeToDatabase(), and validate().
{ $this->sqlite_handle = false; if ($this->use_sqlite_db && function_exists('sqlite_open')) { $this->sqlite_handle = sqlite_open($this->sqlite_database, 0666, $error); if ($this->sqlite_handle !== false) { $res = sqlite_query($this->sqlite_handle, "PRAGMA table_info(codes)"); if (sqlite_num_rows($res) == 0) { sqlite_query($this->sqlite_handle, "CREATE TABLE codes (iphash VARCHAR(32) PRIMARY KEY, code VARCHAR(32) NOT NULL, created INTEGER)"); } } return $this->sqlite_handle != false; } return $this->sqlite_handle; }
Output image to the browser.
private
Definition at line 1048 of file securimage.php.
References exit, and image_type.
Referenced by doImage().
{ header("Expires: Mon, 26 Jul 1997 05:00:00 GMT"); header("Last-Modified: " . gmdate("D, d M Y H:i:s") . "GMT"); header("Cache-Control: no-store, no-cache, must-revalidate"); header("Cache-Control: post-check=0, pre-check=0", false); header("Pragma: no-cache"); switch($this->image_type) { case SI_IMAGE_JPEG: header("Content-Type: image/jpeg"); imagejpeg($this->im, null, 90); break; case SI_IMAGE_GIF: header("Content-Type: image/gif"); imagegif($this->im); break; default: header("Content-Type: image/png"); imagepng($this->im); break; } imagedestroy($this->im); exit; }
Output audio file with HTTP headers to browser.
$sound = new Securimage(); $sound->audio_format = 'mp3'; $sound->outputAudioFile();
Definition at line 623 of file securimage.php.
References $ext, audio_format, echo, exit, and getAudibleCode().
{ if (strtolower($this->audio_format) == 'wav') { header('Content-type: audio/x-wav'); $ext = 'wav'; } else { header('Content-type: audio/mpeg'); // default to mp3 $ext = 'mp3'; } header("Content-Disposition: attachment; filename=\"securimage_audio.{$ext}\""); header('Cache-Control: no-store, no-cache, must-revalidate'); header('Expires: Sun, 1 Jan 2000 12:00:00 GMT'); header('Last-Modified: ' . gmdate('D, d M Y H:i:s') . 'GMT'); $audio = $this->getAudibleCode($ext); header('Content-Length: ' . strlen($audio)); echo $audio; exit; }
Purge codes over a day old from database.
private
Definition at line 1482 of file securimage.php.
{ if ($this->use_sqlite_db && $this->sqlite_handle !== false) { $now = time(); $limit = (!is_numeric($this->expiry_time) || $this->expiry_time < 1) ? 86400 : $this->expiry_time; sqlite_query($this->sqlite_handle, "DELETE FROM codes WHERE $now - created > $limit"); } }
Reads a word list file to get a code.
private
Definition at line 1017 of file securimage.php.
References $data, $end, $max, and $start.
Referenced by createCode().
{ $fp = @fopen($this->wordlist_file, 'rb'); if (!$fp) return false; $fsize = filesize($this->wordlist_file); if ($fsize < 32) return false; // too small of a list to be effective if ($fsize < 128) { $max = $fsize; // still pretty small but changes the range of seeking } else { $max = 128; } fseek($fp, rand(0, $fsize - $max), SEEK_SET); $data = fread($fp, 128); // read a random 128 bytes from file fclose($fp); $data = preg_replace("/\r?\n/", "\n", $data); $start = strpos($data, "\n", rand(0, 100)) + 1; // random start position $end = strpos($data, "\n", $start); // find end of word return strtolower(substr($data, $start, $end - $start)); // return substring in 128 bytes }
Save captcha code to sqlite database.
private
Definition at line 1418 of file securimage.php.
References $code, getIPHash(), and openDatabase().
Referenced by saveData().
{ $success = false; $this->openDatabase(); if ($this->use_sqlite_db && $this->sqlite_handle !== false) { $ip = $this->getIPHash(); $time = time(); $code = $_SESSION['securimage_code_value']; // hash code for security - if cookies are disabled the session still exists at this point $success = sqlite_query($this->sqlite_handle, "INSERT OR REPLACE INTO codes(iphash, code, created) VALUES('$ip', '$code', $time)"); } return $success !== false; }
Save the code in the session.
private
Definition at line 1129 of file securimage.php.
References saveCodeToDatabase().
Referenced by createCode().
{ $_SESSION['securimage_code_value'] = strtolower($this->code); $_SESSION['securimage_code_ctime'] = time(); $this->saveCodeToDatabase(); }
Securimage::scrambleAudioData | ( | &$ | data, |
$ | format | ||
) |
Randomly modify the audio data to scramble sound and prevent binary recognition.
Take care not to "break" the audio file by leaving the header data intact.
$data | Sound data in mp3 of wav format |
Definition at line 1290 of file securimage.php.
Referenced by generateMP3(), and generateWAV().
{ if ($format == 'wav') { $start = strpos($data, 'data') + 4; // look for "data" indicator if ($start === false) $start = 44; // if not found assume 44 byte header } else { // mp3 $start = 4; // 4 byte (32 bit) frame header } $start += rand(1, 64); // randomize starting offset $datalen = strlen($data) - $start - 256; // leave last 256 bytes unchanged for ($i = $start; $i < $datalen; $i += 64) { $ch = ord($data{$i}); if ($ch < 9 || $ch > 119) continue; $data{$i} = chr($ch + rand(-8, 8)); } }
Class constructor.
Because the class uses sessions, this will attempt to start a session if there is no previous one.
If you do not start a session before calling the class, the constructor must be called before any output is sent to the browser.
$securimage = new Securimage();
Definition at line 506 of file securimage.php.
References audio_format, code_length, image_bg_color, image_height, image_signature, image_type, image_width, line_color, multi_text_color, num_lines, perturbation, signature_color, text_angle_maximum, text_angle_minimum, text_color, text_transparency_percentage, trim(), use_multi_text, use_transparent_text, and use_wordlist.
{ // Initialize session or attach to existing if ( session_id() == '' ) { // no session has been started yet, which is needed for validation if (trim($this->session_name) != '') { session_name($this->session_name); // set session name if provided } session_start(); } // Set Default Values $this->image_width = 230; $this->image_height = 80; $this->image_type = SI_IMAGE_PNG; $this->code_length = 6; $this->charset = 'ABCDEFGHKLMNPRSTUVWYZabcdefghklmnprstuvwyz23456789'; $this->wordlist_file = './words/words.txt'; $this->use_wordlist = false; $this->gd_font_file = 'gdfonts/automatic.gdf'; $this->use_gd_font = false; $this->gd_font_size = 24; $this->text_x_start = 15; $this->ttf_file = './AHGBold.ttf'; $this->perturbation = 0.75; $this->iscale = 5; $this->text_angle_minimum = 0; $this->text_angle_maximum = 0; $this->image_bg_color = new Securimage_Color(0xff, 0xff, 0xff); $this->text_color = new Securimage_Color(0x3d, 0x3d, 0x3d); $this->multi_text_color = array(new Securimage_Color(0x0, 0x20, 0xCC), new Securimage_Color(0x0, 0x30, 0xEE), new Securimage_color(0x0, 0x40, 0xCC), new Securimage_Color(0x0, 0x50, 0xEE), new Securimage_Color(0x0, 0x60, 0xCC)); $this->use_multi_text = false; $this->use_transparent_text = false; $this->text_transparency_percentage = 30; $this->num_lines = 10; $this->line_color = new Securimage_Color(0x3d, 0x3d, 0x3d); $this->draw_lines_over_text = true; $this->image_signature = ''; $this->signature_color = new Securimage_Color(0x20, 0x50, 0xCC); $this->signature_font = './AHGBold.ttf'; $this->audio_path = './audio/'; $this->audio_format = 'mp3'; $this->session_name = ''; $this->expiry_time = 900; $this->sqlite_database = 'database/securimage.sqlite'; $this->use_sqlite_db = false; $this->sqlite_handle = false; }
Securimage::setAudioPath | ( | $ | audio_directory | ) |
Set the path to the audio directory.
Definition at line 1113 of file securimage.php.
{ if (is_dir($audio_directory) && is_readable($audio_directory)) { $this->audio_path = $audio_directory; return true; } else { return false; } }
Set the background of the CAPTCHA image.
private
Definition at line 728 of file securimage.php.
References $img, background_directory, bgimg, getBackgroundFromDirectory(), image_height, and image_width.
Referenced by doImage().
{ imagefilledrectangle($this->im, 0, 0, $this->image_width * $this->iscale, $this->image_height * $this->iscale, $this->gdbgcolor); imagefilledrectangle($this->tmpimg, 0, 0, $this->image_width * $this->iscale, $this->image_height * $this->iscale, $this->gdbgcolor); if ($this->bgimg == '') { if ($this->background_directory != null && is_dir($this->background_directory) && is_readable($this->background_directory)) { $img = $this->getBackgroundFromDirectory(); if ($img != false) { $this->bgimg = $img; } } } $dat = @getimagesize($this->bgimg); if($dat == false) { return; } switch($dat[2]) { case 1: $newim = @imagecreatefromgif($this->bgimg); break; case 2: $newim = @imagecreatefromjpeg($this->bgimg); break; case 3: $newim = @imagecreatefrompng($this->bgimg); break; case 15: $newim = @imagecreatefromwbmp($this->bgimg); break; case 16: $newim = @imagecreatefromxbm($this->bgimg); break; default: return; } if(!$newim) return; imagecopyresized($this->im, $newim, 0, 0, 0, 0, $this->image_width, $this->image_height, imagesx($newim), imagesy($newim)); }
Securimage::show | ( | $ | background_image = "" | ) |
Generate a code and output the image to the browser.
<?php include 'securimage.php'; $securimage = new Securimage(); $securimage->show('bg.jpg'); ?>
string | $background_image | The path to an image to use as the background for the CAPTCHA |
Definition at line 582 of file securimage.php.
Validate the code to the user code.
private
Definition at line 1143 of file securimage.php.
References $code, $code_entered, clearCodeFromDatabase(), getCodeFromDatabase(), isCodeExpired(), openDatabase(), and trim().
Referenced by check().
{ // retrieve code from session, if no code exists check sqlite database if supported. if (isset($_SESSION['securimage_code_value']) && trim($_SESSION['securimage_code_value']) != '') { if ($this->isCodeExpired($_SESSION['securimage_code_ctime']) == false) { $code = $_SESSION['securimage_code_value']; } } else if ($this->use_sqlite_db == true && function_exists('sqlite_open')) { // no code in session - may mean user has cookies turned off $this->openDatabase(); $code = $this->getCodeFromDatabase(); } else { // session code invalid or non-existant and code not found in sqlite db or sqlite is not available $code = ''; } $code = trim(strtolower($code)); $code_entered = trim(strtolower($this->code_entered)); $this->correct_code = false; if ($code != '') { if ($code == $code_entered) { $this->correct_code = true; $_SESSION['securimage_code_value'] = ''; $_SESSION['securimage_code_ctime'] = ''; $this->clearCodeFromDatabase(); } } }
Securimage::$audio_format |
Definition at line 348 of file securimage.php.
Securimage::$audio_path |
Definition at line 341 of file securimage.php.
Securimage::$background_directory = null |
Definition at line 248 of file securimage.php.
Securimage::$bgimg |
Definition at line 420 of file securimage.php.
Securimage::$charset |
Definition at line 145 of file securimage.php.
Securimage::$code |
Definition at line 428 of file securimage.php.
Referenced by check(), generateCode(), getAudibleCode(), getCodeFromDatabase(), saveCodeToDatabase(), and validate().
Securimage::$code_entered |
Definition at line 436 of file securimage.php.
Referenced by validate().
Securimage::$code_length |
Definition at line 136 of file securimage.php.
Securimage::$correct_code |
Definition at line 444 of file securimage.php.
Securimage::$draw_lines_over_text |
Definition at line 316 of file securimage.php.
Securimage::$expiry_time |
Definition at line 366 of file securimage.php.
Securimage::$gd_font_file |
Definition at line 169 of file securimage.php.
Securimage::$gd_font_size |
Definition at line 178 of file securimage.php.
Securimage::$gdbgcolor |
Definition at line 492 of file securimage.php.
Securimage::$gdlinecolor |
Definition at line 460 of file securimage.php.
Securimage::$gdmulticolor |
Definition at line 468 of file securimage.php.
Securimage::$gdsignaturecolor |
Definition at line 484 of file securimage.php.
Securimage::$gdtextcolor |
Definition at line 476 of file securimage.php.
Securimage::$im |
Definition at line 395 of file securimage.php.
Securimage::$image_bg_color |
Definition at line 237 of file securimage.php.
Securimage::$image_height |
Definition at line 121 of file securimage.php.
Securimage::$image_signature |
Definition at line 324 of file securimage.php.
Securimage::$image_type |
Definition at line 129 of file securimage.php.
Securimage::$image_width |
Definition at line 114 of file securimage.php.
Securimage::$iscale |
Definition at line 412 of file securimage.php.
Securimage::$line_color |
Definition at line 308 of file securimage.php.
Securimage::$multi_text_color |
Definition at line 273 of file securimage.php.
Securimage::$num_lines |
Definition at line 301 of file securimage.php.
Securimage::$perturbation |
Definition at line 202 of file securimage.php.
Securimage::$session_name = '' |
Definition at line 357 of file securimage.php.
Securimage::$signature_color |
Definition at line 332 of file securimage.php.
Securimage::$sqlite_database |
Definition at line 377 of file securimage.php.
Securimage::$sqlite_handle |
Definition at line 452 of file securimage.php.
Securimage::$text_angle_maximum |
Definition at line 221 of file securimage.php.
Securimage::$text_angle_minimum |
Definition at line 212 of file securimage.php.
Securimage::$text_color |
Definition at line 258 of file securimage.php.
Securimage::$text_transparency_percentage |
Definition at line 290 of file securimage.php.
Securimage::$text_x_start |
Definition at line 230 of file securimage.php.
Securimage::$tmpimg |
Definition at line 403 of file securimage.php.
Securimage::$ttf_file |
Definition at line 194 of file securimage.php.
Securimage::$use_gd_font |
Definition at line 185 of file securimage.php.
Securimage::$use_multi_text |
Definition at line 266 of file securimage.php.
Securimage::$use_sqlite_db |
Use an SQLite database for storing codes as a backup to sessions.
Note: Sessions will still be used
Definition at line 383 of file securimage.php.
Securimage::$use_transparent_text |
Definition at line 281 of file securimage.php.
Securimage::$use_wordlist = false |
Definition at line 159 of file securimage.php.
Securimage::$wordlist_file |
Definition at line 152 of file securimage.php.