function image_captcha_captcha in CAPTCHA 7
Same name and namespace in other branches
- 8 image_captcha/image_captcha.module \image_captcha_captcha()
- 5.3 image_captcha/image_captcha.module \image_captcha_captcha()
- 6.2 image_captcha/image_captcha.module \image_captcha_captcha()
- 6 image_captcha/image_captcha.module \image_captcha_captcha()
Implements hook_captcha().
File
- image_captcha/
image_captcha.module, line 205 - Implements image CAPTCHA for use with the CAPTCHA module
Code
function image_captcha_captcha($op, $captcha_type = '', $captcha_sid = NULL) {
switch ($op) {
case 'list':
// Only offer the image CAPTCHA if it is possible to generate an image on this setup.
if (!(_image_captcha_check_setup() & IMAGE_CAPTCHA_ERROR_NO_GDLIB)) {
return array(
'Image',
);
}
else {
return array();
}
break;
case 'generate':
if ($captcha_type == 'Image') {
// In maintenance mode, the image CAPTCHA does not work because the request
// for the image itself won't succeed (only ?q=user is permitted for
// unauthenticated users). We fall back to the Math CAPTCHA in that case.
global $user;
if (variable_get('maintenance_mode', 0) && $user->uid == 0) {
return captcha_captcha('generate', 'Math');
}
// Generate a CAPTCHA code.
$allowed_chars = _image_captcha_utf8_split(variable_get('image_captcha_image_allowed_chars', IMAGE_CAPTCHA_ALLOWED_CHARACTERS));
$code_length = (int) variable_get('image_captcha_code_length', 5);
$code = '';
for ($i = 0; $i < $code_length; $i++) {
$code .= $allowed_chars[array_rand($allowed_chars)];
}
// Build the result to return.
$result = array();
$result['solution'] = $code;
// Generate image source URL (add timestamp to avoid problems with
// client side caching: subsequent images of the same CAPTCHA session
// have the same URL, but should display a different code).
$options = array(
'query' => array(
'sid' => $captcha_sid,
'ts' => REQUEST_TIME,
),
);
$img_src = drupal_strip_dangerous_protocols(url("image_captcha", $options));
list($width, $height) = _image_captcha_image_size($code);
$result['form']['captcha_image'] = array(
'#theme' => 'image',
'#weight' => -2,
'#path' => $img_src,
'#width' => $width,
'#height' => $height,
'#title' => t('Image CAPTCHA'),
'#alt' => t('Image CAPTCHA'),
);
$result['form']['captcha_response'] = array(
'#type' => 'textfield',
'#title' => t('What code is in the image?'),
'#description' => t('Enter the characters shown in the image.'),
'#weight' => 0,
'#required' => TRUE,
'#size' => 15,
);
// Handle the case insensitive validation option combined with ignoring spaces.
switch (variable_get('captcha_default_validation', CAPTCHA_DEFAULT_VALIDATION_CASE_INSENSITIVE)) {
case CAPTCHA_DEFAULT_VALIDATION_CASE_SENSITIVE:
$result['captcha_validate'] = 'captcha_validate_ignore_spaces';
break;
case CAPTCHA_DEFAULT_VALIDATION_CASE_INSENSITIVE:
$result['captcha_validate'] = 'captcha_validate_case_insensitive_ignore_spaces';
break;
}
return $result;
}
break;
}
}