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<?php
function ascii_art_captcha_help($path, $arg) {
switch ($path) {
case 'admin/config/people/captcha/ascii_art_captcha':
$output = '<p>' . t('The ASCII art CAPTCHA shows a random character code in ASCII art style. Example with current settings:') . '</p>';
$captcha = ascii_art_captcha_captcha('generate', 'ASCII art CAPTCHA');
$output .= $captcha['form']['ascii']['#markup'];
return $output;
}
}
function ascii_art_captcha_menu() {
$items = array();
$items['admin/config/people/captcha/ascii_art_captcha'] = array(
'title' => 'ASCII art CAPTCHA',
'file' => 'ascii_art_captcha.admin.inc',
'page callback' => 'drupal_get_form',
'page arguments' => array(
'ascii_art_captcha_settings_form',
),
'access arguments' => array(
'administer CAPTCHA settings',
),
'type' => MENU_LOCAL_TASK,
);
return $items;
}
function _ascii_art_captcha_get_allowed_characters() {
$allowed_chars = array();
$allowed_chars_settings = variable_get('ascii_art_captcha_allowed_characters', drupal_map_assoc(array(
'upper',
'lower',
'digit',
)));
if ($allowed_chars_settings['upper']) {
$allowed_chars = array_merge($allowed_chars, array(
'A',
'B',
'C',
'D',
'E',
'F',
'G',
'H',
'I',
'J',
'K',
'L',
'M',
'N',
'P',
'Q',
'R',
'S',
'T',
'U',
'V',
'W',
'X',
'Y',
'Z',
));
}
if ($allowed_chars_settings['lower']) {
$allowed_chars = array_merge($allowed_chars, array(
'a',
'b',
'c',
'd',
'e',
'f',
'g',
'h',
'i',
'j',
'k',
'l',
'm',
'n',
'p',
'q',
'r',
's',
't',
'u',
'v',
'w',
'x',
'y',
'z',
));
}
if ($allowed_chars_settings['digit']) {
$allowed_chars += array_merge($allowed_chars, array(
'1',
'2',
'3',
'4',
'5',
'6',
'7',
'8',
'9',
));
}
return $allowed_chars;
}
function ascii_art_captcha_captcha($op, $captcha_type = '') {
switch ($op) {
case 'list':
return array(
'ASCII art CAPTCHA',
);
case 'generate':
if ($captcha_type == "ASCII art CAPTCHA") {
$allowed_chars = _ascii_art_captcha_get_allowed_characters();
$code_length = (int) variable_get('ascii_art_captcha_code_length', 6);
$font_name = variable_get('ascii_art_captcha_font', 'standard');
if (!(include_once 'fonts/ascii_art_captcha_font_' . $font_name . '.inc')) {
return;
}
$font = call_user_func('ascii_art_captcha_font_' . $font_name);
if (!$font) {
return;
}
$solution = '';
$ascii_lines = array();
for ($i = 0; $i < $font['height']; $i++) {
$ascii_lines[$i] = '';
}
for ($i = 0; $i < $code_length; $i++) {
$character = $allowed_chars[array_rand($allowed_chars)];
$solution .= $character;
foreach ($font[$character] as $l => $cline) {
$ascii_lines[$l] .= ' ' . check_plain($cline);
}
}
$captcha = array();
$captcha['solution'] = $solution;
$style = 'line-height:1.1;';
if (variable_get('ascii_art_captcha_font_size', 0)) {
$style .= 'font-size:' . variable_get('ascii_art_captcha_font_size', 0) . 'pt;';
}
$captcha['form']['ascii'] = array(
'#markup' => '<pre class="ascii_art_captcha" style="' . $style . '">' . implode('<br />', $ascii_lines) . '</pre>',
);
$captcha['form']['captcha_response'] = array(
'#type' => 'textfield',
'#title' => t('Enter the code above'),
'#size' => 10,
'#maxlength' => 10,
'#required' => TRUE,
'#description' => t('Enter the code depicted in ASCII art style.'),
);
return $captcha;
}
break;
}
}