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<?php
trait WPCF7_ConfigValidator_Mail {
/**
* Callback function for WPCF7_MailTaggedText. Replaces mail-tags with
* the most conservative inputs.
*/
public function replace_mail_tags_with_minimum_input( $matches ) {
// allow [[foo]] syntax for escaping a tag
if ( $matches[1] === '[' and $matches[4] === ']' ) {
return substr( $matches[0], 1, -1 );
}
$tag = $matches[0];
$tagname = $matches[2];
$values = $matches[3];
$mail_tag = new WPCF7_MailTag( $tag, $tagname, $values );
$field_name = $mail_tag->field_name();
$example_email = '[email protected]';
$example_text = 'example';
$example_blank = '';
$form_tags = $this->contact_form->scan_form_tags(
array( 'name' => $field_name )
);
if ( $form_tags ) {
$form_tag = new WPCF7_FormTag( $form_tags[0] );
$is_required = $form_tag->is_required() || 'radio' === $form_tag->type;
if ( ! $is_required ) {
return $example_blank;
}
if ( wpcf7_form_tag_supports( $form_tag->type, 'selectable-values' ) ) {
if ( $form_tag->pipes instanceof WPCF7_Pipes ) {
if ( $mail_tag->get_option( 'do_not_heat' ) ) {
$before_pipes = $form_tag->pipes->collect_befores();
$last_item = array_pop( $before_pipes );
} else {
$after_pipes = $form_tag->pipes->collect_afters();
$last_item = array_pop( $after_pipes );
}
} else {
$last_item = array_pop( $form_tag->values );
}
if ( $last_item and wpcf7_is_mailbox_list( $last_item ) ) {
return $example_email;
} else {
return $example_text;
}
}
if ( 'email' === $form_tag->basetype ) {
return $example_email;
} else {
return $example_text;
}
} else { // maybe special mail tag
// for back-compat
$field_name = preg_replace( '/^wpcf7\./', '_', $field_name );
if ( '_site_admin_email' === $field_name ) {
return get_bloginfo( 'admin_email', 'raw' );
} elseif ( '_user_agent' === $field_name ) {
return $example_text;
} elseif ( '_user_email' === $field_name ) {
return $this->contact_form->is_true( 'subscribers_only' )
? $example_email
: $example_blank;
} elseif ( str_starts_with( $field_name, '_user_' ) ) {
return $this->contact_form->is_true( 'subscribers_only' )
? $example_text
: $example_blank;
} elseif ( str_starts_with( $field_name, '_' ) ) {
return str_ends_with( $field_name, '_email' )
? $example_email
: $example_text;
}
}
return $tag;
}
/**
* Runs error detection for the mail sections.
*/
public function validate_mail( $template = 'mail' ) {
if (
$this->contact_form->is_true( 'demo_mode' ) or
$this->contact_form->is_true( 'skip_mail' )
) {
return;
}
$components = (array) $this->contact_form->prop( $template );
if ( ! $components ) {
return;
}
if ( 'mail' !== $template and empty( $components['active'] ) ) {
return;
}
$components = wp_parse_args( $components, array(
'subject' => '',
'sender' => '',
'recipient' => '',
'additional_headers' => '',
'body' => '',
'attachments' => '',
) );
$callback = array( $this, 'replace_mail_tags_with_minimum_input' );
$subject = new WPCF7_MailTaggedText(
$components['subject'],
array( 'callback' => $callback )
);
$subject = $subject->replace_tags();
$subject = wpcf7_strip_newline( $subject );
$this->detect_maybe_empty( sprintf( '%s.subject', $template ), $subject );
$sender = new WPCF7_MailTaggedText(
$components['sender'],
array( 'callback' => $callback )
);
$sender = $sender->replace_tags();
$sender = wpcf7_strip_newline( $sender );
$invalid_mailbox = $this->detect_invalid_mailbox_syntax(
sprintf( '%s.sender', $template ),
$sender
);
if ( ! $invalid_mailbox and ! wpcf7_is_email_in_site_domain( $sender ) ) {
$this->add_error( sprintf( '%s.sender', $template ),
'email_not_in_site_domain',
array(
'message' => __( "Sender email address does not belong to the site domain.", 'contact-form-7' ),
)
);
}
$recipient = new WPCF7_MailTaggedText(
$components['recipient'],
array( 'callback' => $callback )
);
$recipient = $recipient->replace_tags();
$recipient = wpcf7_strip_newline( $recipient );
$this->detect_invalid_mailbox_syntax(
sprintf( '%s.recipient', $template ),
$recipient
);
$additional_headers = new WPCF7_MailTaggedText(
$components['additional_headers'],
array( 'callback' => $callback )
);
$additional_headers = $additional_headers->replace_tags();
$additional_headers = explode( "\n", $additional_headers );
$mailbox_header_types = array( 'reply-to', 'cc', 'bcc' );
$invalid_mail_header_exists = false;
foreach ( $additional_headers as $header ) {
$header = trim( $header );
if ( '' === $header ) {
continue;
}
if ( ! preg_match( '/^([0-9A-Za-z-]+):(.*)$/', $header, $matches ) ) {
$invalid_mail_header_exists = true;
} else {
$header_name = $matches[1];
$header_value = trim( $matches[2] );
if ( in_array( strtolower( $header_name ), $mailbox_header_types )
and '' !== $header_value ) {
$this->detect_invalid_mailbox_syntax(
sprintf( '%s.additional_headers', $template ),
$header_value,
array(
'message' => __( "Invalid mailbox syntax is used in the %name% field.", 'contact-form-7' ),
'params' => array( 'name' => $header_name )
)
);
}
}
}
if ( $invalid_mail_header_exists ) {
$this->add_error( sprintf( '%s.additional_headers', $template ),
'invalid_mail_header',
array(
'message' => __( "There are invalid mail header fields.", 'contact-form-7' ),
)
);
}
$body = new WPCF7_MailTaggedText(
$components['body'],
array( 'callback' => $callback )
);
$body = $body->replace_tags();
$this->detect_maybe_empty( sprintf( '%s.body', $template ), $body );
if ( '' !== $components['attachments'] ) {
$attachables = array();
$tags = $this->contact_form->scan_form_tags(
array( 'type' => array( 'file', 'file*' ) )
);
foreach ( $tags as $tag ) {
$name = $tag->name;
if ( ! str_contains( $components['attachments'], "[{$name}]" ) ) {
continue;
}
$limit = (int) $tag->get_limit_option();
if ( empty( $attachables[$name] ) or $attachables[$name] < $limit ) {
$attachables[$name] = $limit;
}
}
$total_size = array_sum( $attachables );
$has_file_not_found = false;
$has_file_not_in_content_dir = false;
foreach ( explode( "\n", $components['attachments'] ) as $line ) {
$line = trim( $line );
if ( '' === $line or str_starts_with( $line, '[' ) ) {
continue;
}
$has_file_not_found = $this->detect_file_not_found(
sprintf( '%s.attachments', $template ), $line
);
if ( ! $has_file_not_found and ! $has_file_not_in_content_dir ) {
$has_file_not_in_content_dir = $this->detect_file_not_in_content_dir(
sprintf( '%s.attachments', $template ), $line
);
}
if ( ! $has_file_not_found ) {
$path = path_join( WP_CONTENT_DIR, $line );
$total_size += (int) @filesize( $path );
}
}
$max = 25 * MB_IN_BYTES; // 25 MB
if ( $max < $total_size ) {
$this->add_error( sprintf( '%s.attachments', $template ),
'attachments_overweight',
array(
'message' => __( "The total size of attachment files is too large.", 'contact-form-7' ),
)
);
}
}
}
/**
* Detects errors of invalid mailbox syntax.
*
* @link https://contactform7.com/configuration-errors/invalid-mailbox-syntax/
*/
public function detect_invalid_mailbox_syntax( $section, $content, $args = '' ) {
$args = wp_parse_args( $args, array(
'message' => __( "Invalid mailbox syntax is used.", 'contact-form-7' ),
'params' => array(),
) );
if ( ! wpcf7_is_mailbox_list( $content ) ) {
return $this->add_error( $section,
'invalid_mailbox_syntax',
$args
);
}
return false;
}
/**
* Detects errors of empty message fields.
*
* @link https://contactform7.com/configuration-errors/maybe-empty/
*/
public function detect_maybe_empty( $section, $content ) {
if ( '' === $content ) {
return $this->add_error( $section,
'maybe_empty',
array(
'message' => __( "There is a possible empty field.", 'contact-form-7' ),
)
);
}
return false;
}
/**
* Detects errors of nonexistent attachment files.
*
* @link https://contactform7.com/configuration-errors/file-not-found/
*/
public function detect_file_not_found( $section, $content ) {
$path = path_join( WP_CONTENT_DIR, $content );
if ( ! is_readable( $path ) or ! is_file( $path ) ) {
return $this->add_error( $section,
'file_not_found',
array(
'message' => __( "Attachment file does not exist at %path%.", 'contact-form-7' ),
'params' => array( 'path' => $content ),
)
);
}
return false;
}
/**
* Detects errors of attachment files out of the content directory.
*
* @link https://contactform7.com/configuration-errors/file-not-in-content-dir/
*/
public function detect_file_not_in_content_dir( $section, $content ) {
$path = path_join( WP_CONTENT_DIR, $content );
if ( ! wpcf7_is_file_path_in_content_dir( $path ) ) {
return $this->add_error( $section,
'file_not_in_content_dir',
array(
'message' => __( "It is not allowed to use files outside the wp-content directory.", 'contact-form-7' ),
)
);
}
return false;
}
}