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<?php
/**
** A base module for [captchac] and [captchar]
**/
/* Shortcode handler */
add_action( 'wpcf7_init', 'wpcf7_add_shortcode_captcha' );
function wpcf7_add_shortcode_captcha() {
wpcf7_add_shortcode( array( 'captchac', 'captchar' ),
'wpcf7_captcha_shortcode_handler', true );
}
function wpcf7_captcha_shortcode_handler( $tag ) {
$tag = new WPCF7_Shortcode( $tag );
if ( 'captchac' == $tag->type && ! class_exists( 'ReallySimpleCaptcha' ) )
return '<em>' . __( 'To use CAPTCHA, you need <a href="http://wordpress.org/extend/plugins/really-simple-captcha/">Really Simple CAPTCHA</a> plugin installed.', 'contact-form-7' ) . '</em>';
if ( empty( $tag->name ) )
return '';
$validation_error = wpcf7_get_validation_error( $tag->name );
$class = wpcf7_form_controls_class( $tag->type );
if ( 'captchac' == $tag->type ) { // CAPTCHA-Challenge (image)
$class .= ' wpcf7-captcha-' . $tag->name;
$atts = array();
$atts['class'] = $tag->get_class_option( $class );
$atts['id'] = $tag->get_id_option();
$op = array( // Default
'img_size' => array( 72, 24 ),
'base' => array( 6, 18 ),
'font_size' => 14,
'font_char_width' => 15 );
$op = array_merge( $op, wpcf7_captchac_options( $tag->options ) );
if ( ! $filename = wpcf7_generate_captcha( $op ) )
return '';
if ( ! empty( $op['img_size'] ) ) {
if ( isset( $op['img_size'][0] ) )
$atts['width'] = $op['img_size'][0];
if ( isset( $op['img_size'][1] ) )
$atts['height'] = $op['img_size'][1];
}
$atts['alt'] = 'captcha';
$atts['src'] = wpcf7_captcha_url( $filename );
$atts = wpcf7_format_atts( $atts );
$prefix = substr( $filename, 0, strrpos( $filename, '.' ) );
$html = sprintf(
'<input type="hidden" name="_wpcf7_captcha_challenge_%1$s" value="%2$s" /><img %3$s />',
$tag->name, $prefix, $atts );
return $html;
} elseif ( 'captchar' == $tag->type ) { // CAPTCHA-Response (input)
if ( $validation_error )
$class .= ' wpcf7-not-valid';
$atts = array();
$atts['size'] = $tag->get_size_option( '40' );
$atts['maxlength'] = $tag->get_maxlength_option();
$atts['minlength'] = $tag->get_minlength_option();
if ( $atts['maxlength'] && $atts['minlength']
&& $atts['maxlength'] < $atts['minlength'] ) {
unset( $atts['maxlength'], $atts['minlength'] );
}
$atts['class'] = $tag->get_class_option( $class );
$atts['id'] = $tag->get_id_option();
$atts['tabindex'] = $tag->get_option( 'tabindex', 'int', true );
$atts['aria-invalid'] = $validation_error ? 'true' : 'false';
$value = (string) reset( $tag->values );
if ( wpcf7_is_posted() )
$value = '';
if ( $tag->has_option( 'placeholder' ) || $tag->has_option( 'watermark' ) ) {
$atts['placeholder'] = $value;
$value = '';
}
$atts['value'] = $value;
$atts['type'] = 'text';
$atts['name'] = $tag->name;
$atts = wpcf7_format_atts( $atts );
$html = sprintf(
'<span class="wpcf7-form-control-wrap %1$s"><input %2$s />%3$s</span>',
sanitize_html_class( $tag->name ), $atts, $validation_error );
return $html;
}
}
/* Validation filter */
add_filter( 'wpcf7_validate_captchar', 'wpcf7_captcha_validation_filter', 10, 2 );
function wpcf7_captcha_validation_filter( $result, $tag ) {
$tag = new WPCF7_Shortcode( $tag );
$type = $tag->type;
$name = $tag->name;
$captchac = '_wpcf7_captcha_challenge_' . $name;
$prefix = isset( $_POST[$captchac] ) ? (string) $_POST[$captchac] : '';
$response = isset( $_POST[$name] ) ? (string) $_POST[$name] : '';
$response = wpcf7_canonicalize( $response );
if ( 0 == strlen( $prefix ) || ! wpcf7_check_captcha( $prefix, $response ) ) {
$result->invalidate( $tag, wpcf7_get_message( 'captcha_not_match' ) );
}
if ( 0 != strlen( $prefix ) ) {
wpcf7_remove_captcha( $prefix );
}
return $result;
}
/* Ajax echo filter */
add_filter( 'wpcf7_ajax_onload', 'wpcf7_captcha_ajax_refill' );
add_filter( 'wpcf7_ajax_json_echo', 'wpcf7_captcha_ajax_refill' );
function wpcf7_captcha_ajax_refill( $items ) {
if ( ! is_array( $items ) )
return $items;
$fes = wpcf7_scan_shortcode( array( 'type' => 'captchac' ) );
if ( empty( $fes ) )
return $items;
$refill = array();
foreach ( $fes as $fe ) {
$name = $fe['name'];
$options = $fe['options'];
if ( empty( $name ) )
continue;
$op = wpcf7_captchac_options( $options );
if ( $filename = wpcf7_generate_captcha( $op ) ) {
$captcha_url = wpcf7_captcha_url( $filename );
$refill[$name] = $captcha_url;
}
}
if ( ! empty( $refill ) )
$items['captcha'] = $refill;
return $items;
}
/* Messages */
add_filter( 'wpcf7_messages', 'wpcf7_captcha_messages' );
function wpcf7_captcha_messages( $messages ) {
return array_merge( $messages, array( 'captcha_not_match' => array(
'description' => __( "The code that sender entered does not match the CAPTCHA", 'contact-form-7' ),
'default' => __( 'Your entered code is incorrect.', 'contact-form-7' )
) ) );
}
/* Tag generator */
add_action( 'admin_init', 'wpcf7_add_tag_generator_captcha', 45 );
function wpcf7_add_tag_generator_captcha() {
if ( ! function_exists( 'wpcf7_add_tag_generator' ) )
return;
wpcf7_add_tag_generator( 'captcha', __( 'CAPTCHA', 'contact-form-7' ),
'wpcf7-tg-pane-captcha', 'wpcf7_tg_pane_captcha' );
}
function wpcf7_tg_pane_captcha( $contact_form ) {
?>
<div id="wpcf7-tg-pane-captcha" class="hidden">
<form action="">
<table>
<?php if ( ! class_exists( 'ReallySimpleCaptcha' ) ) : ?>
<tr><td colspan="2"><strong style="color: #e6255b"><?php echo esc_html( __( "Note: To use CAPTCHA, you need Really Simple CAPTCHA plugin installed.", 'contact-form-7' ) ); ?></strong><br /><a href="http://wordpress.org/extend/plugins/really-simple-captcha/">http://wordpress.org/extend/plugins/really-simple-captcha/</a></td></tr>
<?php endif; ?>
<tr><td><?php echo esc_html( __( 'Name', 'contact-form-7' ) ); ?><br /><input type="text" name="name" class="tg-name oneline" /></td><td></td></tr>
</table>
<table class="scope captchac">
<caption><?php echo esc_html( __( "Image settings", 'contact-form-7' ) ); ?></caption>
<tr>
<td><code>id</code> (<?php echo esc_html( __( 'optional', 'contact-form-7' ) ); ?>)<br />
<input type="text" name="id" class="idvalue oneline option" /></td>
<td><code>class</code> (<?php echo esc_html( __( 'optional', 'contact-form-7' ) ); ?>)<br />
<input type="text" name="class" class="classvalue oneline option" /></td>
</tr>
<tr>
<td><?php echo esc_html( __( "Foreground color", 'contact-form-7' ) ); ?> (<?php echo esc_html( __( 'optional', 'contact-form-7' ) ); ?>)<br />
<input type="text" name="fg" class="color oneline option" /></td>
<td><?php echo esc_html( __( "Background color", 'contact-form-7' ) ); ?> (<?php echo esc_html( __( 'optional', 'contact-form-7' ) ); ?>)<br />
<input type="text" name="bg" class="color oneline option" /></td>
</tr>
<tr><td colspan="2"><?php echo esc_html( __( "Image size", 'contact-form-7' ) ); ?> (<?php echo esc_html( __( 'optional', 'contact-form-7' ) ); ?>)<br />
<input type="checkbox" name="size:s" class="exclusive option" /> <?php echo esc_html( __( "Small", 'contact-form-7' ) ); ?> 
<input type="checkbox" name="size:m" class="exclusive option" /> <?php echo esc_html( __( "Medium", 'contact-form-7' ) ); ?> 
<input type="checkbox" name="size:l" class="exclusive option" /> <?php echo esc_html( __( "Large", 'contact-form-7' ) ); ?>
</td></tr>
</table>
<table class="scope captchar">
<caption><?php echo esc_html( __( "Input field settings", 'contact-form-7' ) ); ?></caption>
<tr>
<td><code>id</code> (<?php echo esc_html( __( 'optional', 'contact-form-7' ) ); ?>)<br />
<input type="text" name="id" class="idvalue oneline option" /></td>
<td><code>class</code> (<?php echo esc_html( __( 'optional', 'contact-form-7' ) ); ?>)<br />
<input type="text" name="class" class="classvalue oneline option" /></td>
</tr>
<tr>
<td><code>size</code> (<?php echo esc_html( __( 'optional', 'contact-form-7' ) ); ?>)<br />
<input type="number" name="size" class="numeric oneline option" min="1" /></td>
<td><code>maxlength</code> (<?php echo esc_html( __( 'optional', 'contact-form-7' ) ); ?>)<br />
<input type="number" name="maxlength" class="numeric oneline option" min="1" /></td>
</tr>
</table>
<div class="tg-tag"><?php echo esc_html( __( "Copy this code and paste it into the form left.", 'contact-form-7' ) ); ?>
<br />1) <?php echo esc_html( __( "For image", 'contact-form-7' ) ); ?>
<input type="text" name="captchac" class="tag wp-ui-text-highlight code" readonly="readonly" onfocus="this.select()" />
<br />2) <?php echo esc_html( __( "For input field", 'contact-form-7' ) ); ?>
<input type="text" name="captchar" class="tag wp-ui-text-highlight code" readonly="readonly" onfocus="this.select()" />
</div>
</form>
</div>
<?php
}
/* Warning message */
add_action( 'wpcf7_admin_notices', 'wpcf7_captcha_display_warning_message' );
function wpcf7_captcha_display_warning_message() {
if ( ! $contact_form = wpcf7_get_current_contact_form() ) {
return;
}
$has_tags = (bool) $contact_form->form_scan_shortcode(
array( 'type' => array( 'captchac' ) ) );
if ( ! $has_tags )
return;
if ( ! class_exists( 'ReallySimpleCaptcha' ) )
return;
$uploads_dir = wpcf7_captcha_tmp_dir();
wpcf7_init_captcha();
if ( ! is_dir( $uploads_dir ) || ! wp_is_writable( $uploads_dir ) ) {
$message = sprintf( __( 'This contact form contains CAPTCHA fields, but the temporary folder for the files (%s) does not exist or is not writable. You can create the folder or change its permission manually.', 'contact-form-7' ), $uploads_dir );
echo '<div class="error"><p><strong>' . esc_html( $message ) . '</strong></p></div>';
}
if ( ! function_exists( 'imagecreatetruecolor' ) || ! function_exists( 'imagettftext' ) ) {
$message = __( 'This contact form contains CAPTCHA fields, but the necessary libraries (GD and FreeType) are not available on your server.', 'contact-form-7' );
echo '<div class="error"><p><strong>' . esc_html( $message ) . '</strong></p></div>';
}
}
/* CAPTCHA functions */
function wpcf7_init_captcha() {
static $captcha = null;
if ( $captcha ) {
return $captcha;
}
if ( class_exists( 'ReallySimpleCaptcha' ) ) {
$captcha = new ReallySimpleCaptcha();
} else {
return false;
}
$dir = trailingslashit( wpcf7_captcha_tmp_dir() );
$captcha->tmp_dir = $dir;
if ( is_callable( array( $captcha, 'make_tmp_dir' ) ) ) {
$result = $captcha->make_tmp_dir();
if ( ! $result ) {
return false;
}
return $captcha;
}
if ( wp_mkdir_p( $dir ) ) {
$htaccess_file = $dir . '.htaccess';
if ( file_exists( $htaccess_file ) ) {
return $captcha;
}
if ( $handle = @fopen( $htaccess_file, 'w' ) ) {
fwrite( $handle, 'Order deny,allow' . "\n" );
fwrite( $handle, 'Deny from all' . "\n" );
fwrite( $handle, '<Files ~ "^[0-9A-Za-z]+\\.(jpeg|gif|png)$">' . "\n" );
fwrite( $handle, ' Allow from all' . "\n" );
fwrite( $handle, '</Files>' . "\n" );
fclose( $handle );
}
} else {
return false;
}
return $captcha;
}
function wpcf7_captcha_tmp_dir() {
if ( defined( 'WPCF7_CAPTCHA_TMP_DIR' ) )
return WPCF7_CAPTCHA_TMP_DIR;
else
return wpcf7_upload_dir( 'dir' ) . '/wpcf7_captcha';
}
function wpcf7_captcha_tmp_url() {
if ( defined( 'WPCF7_CAPTCHA_TMP_URL' ) )
return WPCF7_CAPTCHA_TMP_URL;
else
return wpcf7_upload_dir( 'url' ) . '/wpcf7_captcha';
}
function wpcf7_captcha_url( $filename ) {
$url = trailingslashit( wpcf7_captcha_tmp_url() ) . $filename;
if ( is_ssl() && 'http:' == substr( $url, 0, 5 ) ) {
$url = 'https:' . substr( $url, 5 );
}
return apply_filters( 'wpcf7_captcha_url', esc_url_raw( $url ) );
}
function wpcf7_generate_captcha( $options = null ) {
if ( ! $captcha = wpcf7_init_captcha() ) {
return false;
}
if ( ! is_dir( $captcha->tmp_dir ) || ! wp_is_writable( $captcha->tmp_dir ) )
return false;
$img_type = imagetypes();
if ( $img_type & IMG_PNG )
$captcha->img_type = 'png';
elseif ( $img_type & IMG_GIF )
$captcha->img_type = 'gif';
elseif ( $img_type & IMG_JPG )
$captcha->img_type = 'jpeg';
else
return false;
if ( is_array( $options ) ) {
if ( isset( $options['img_size'] ) )
$captcha->img_size = $options['img_size'];
if ( isset( $options['base'] ) )
$captcha->base = $options['base'];
if ( isset( $options['font_size'] ) )
$captcha->font_size = $options['font_size'];
if ( isset( $options['font_char_width'] ) )
$captcha->font_char_width = $options['font_char_width'];
if ( isset( $options['fg'] ) )
$captcha->fg = $options['fg'];
if ( isset( $options['bg'] ) )
$captcha->bg = $options['bg'];
}
$prefix = wp_rand();
$captcha_word = $captcha->generate_random_word();
return $captcha->generate_image( $prefix, $captcha_word );
}
function wpcf7_check_captcha( $prefix, $response ) {
if ( ! $captcha = wpcf7_init_captcha() ) {
return false;
}
return $captcha->check( $prefix, $response );
}
function wpcf7_remove_captcha( $prefix ) {
if ( ! $captcha = wpcf7_init_captcha() ) {
return false;
}
if ( preg_match( '/[^0-9]/', $prefix ) ) // Contact Form 7 generates $prefix with wp_rand()
return false;
$captcha->remove( $prefix );
}
add_action( 'template_redirect', 'wpcf7_cleanup_captcha_files', 20 );
function wpcf7_cleanup_captcha_files() {
if ( ! $captcha = wpcf7_init_captcha() ) {
return false;
}
if ( is_callable( array( $captcha, 'cleanup' ) ) )
return $captcha->cleanup();
$dir = trailingslashit( wpcf7_captcha_tmp_dir() );
if ( ! is_dir( $dir ) || ! is_readable( $dir ) || ! wp_is_writable( $dir ) )
return false;
if ( $handle = @opendir( $dir ) ) {
while ( false !== ( $file = readdir( $handle ) ) ) {
if ( ! preg_match( '/^[0-9]+\.(php|txt|png|gif|jpeg)$/', $file ) )
continue;
$stat = @stat( $dir . $file );
if ( $stat['mtime'] + 3600 < time() ) // 3600 secs == 1 hour
@unlink( $dir . $file );
}
closedir( $handle );
}
}
function wpcf7_captchac_options( $options ) {
if ( ! is_array( $options ) )
return array();
$op = array();
$image_size_array = preg_grep( '%^size:[smlSML]$%', $options );
if ( $image_size = array_shift( $image_size_array ) ) {
preg_match( '%^size:([smlSML])$%', $image_size, $is_matches );
switch ( strtolower( $is_matches[1] ) ) {
case 's':
$op['img_size'] = array( 60, 20 );
$op['base'] = array( 6, 15 );
$op['font_size'] = 11;
$op['font_char_width'] = 13;
break;
case 'l':
$op['img_size'] = array( 84, 28 );
$op['base'] = array( 6, 20 );
$op['font_size'] = 17;
$op['font_char_width'] = 19;
break;
case 'm':
default:
$op['img_size'] = array( 72, 24 );
$op['base'] = array( 6, 18 );
$op['font_size'] = 14;
$op['font_char_width'] = 15;
}
}
$fg_color_array = preg_grep( '%^fg:#([0-9a-fA-F]{3}|[0-9a-fA-F]{6})$%', $options );
if ( $fg_color = array_shift( $fg_color_array ) ) {
preg_match( '%^fg:#([0-9a-fA-F]{3}|[0-9a-fA-F]{6})$%', $fg_color, $fc_matches );
if ( 3 == strlen( $fc_matches[1] ) ) {
$r = substr( $fc_matches[1], 0, 1 );
$g = substr( $fc_matches[1], 1, 1 );
$b = substr( $fc_matches[1], 2, 1 );
$op['fg'] = array( hexdec( $r . $r ), hexdec( $g . $g ), hexdec( $b . $b ) );
} elseif ( 6 == strlen( $fc_matches[1] ) ) {
$r = substr( $fc_matches[1], 0, 2 );
$g = substr( $fc_matches[1], 2, 2 );
$b = substr( $fc_matches[1], 4, 2 );
$op['fg'] = array( hexdec( $r ), hexdec( $g ), hexdec( $b ) );
}
}
$bg_color_array = preg_grep( '%^bg:#([0-9a-fA-F]{3}|[0-9a-fA-F]{6})$%', $options );
if ( $bg_color = array_shift( $bg_color_array ) ) {
preg_match( '%^bg:#([0-9a-fA-F]{3}|[0-9a-fA-F]{6})$%', $bg_color, $bc_matches );
if ( 3 == strlen( $bc_matches[1] ) ) {
$r = substr( $bc_matches[1], 0, 1 );
$g = substr( $bc_matches[1], 1, 1 );
$b = substr( $bc_matches[1], 2, 1 );
$op['bg'] = array( hexdec( $r . $r ), hexdec( $g . $g ), hexdec( $b . $b ) );
} elseif ( 6 == strlen( $bc_matches[1] ) ) {
$r = substr( $bc_matches[1], 0, 2 );
$g = substr( $bc_matches[1], 2, 2 );
$b = substr( $bc_matches[1], 4, 2 );
$op['bg'] = array( hexdec( $r ), hexdec( $g ), hexdec( $b ) );
}
}
return $op;
}
?>
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