Add referrer id to hidden fields and filters for email (#27)

* Added referrer ID to form hidden fields

* Add filters for email

* Add filters for email headers and attachments

Author: timiwahalahti

classes/class-cpt-wplf-form.php

@@ -456,6 +456,7 @@ function wplf_form( $id , $content = '', $xclass = '' ) {
 <form class="libre-form libre-form-<?php echo $id . ' ' . $xclass; ?>" <?php echo $multipart; ?>>
   <?php echo apply_filters( 'wplf_form', $content ); ?>
   <input type="hidden" name="referrer" value="<?php the_permalink(); ?>">
+  <input type="hidden" name="_referrer_id" value="<?php esc_attr_e( get_the_id() ) ?>">
   <input type="hidden" name="_form_id" value="<?php esc_attr_e( $id ); ?>">
 </form>
 <?php

inc/wplf-form-actions.php

@@ -18,14 +18,22 @@ function wplf_send_email_copy( $return ) {
   if( isset($form_meta['_wplf_email_copy_enabled']) && $form_meta['_wplf_email_copy_enabled'][0] ) {
     $to = isset($form_meta['_wplf_email_copy_to']) ? $form_meta['_wplf_email_copy_to'][0] : get_option( 'admin_email' );
     $subject = wp_sprintf( __('New submission from %s', 'wp-libre-form'), $referrer );
-    $content = wp_sprintf( __('Form "%s" (ID %d) was submitted with values below: ', 'wp-libre-form'), $form_title, $form_id ) . "\n\n";
+    $content = wp_sprintf( __('Form "%s" (ID %d) was submitted with values below: ', 'wp-libre-form'), $form_title, $form_id );
+    $content = apply_filters( 'wplf_email_copy_content_start', $content, $form_title, $form_id ). "\n\n";
+
     foreach( $_POST as $key => $value ) {
       if( '_' === $key[0] ) {
         continue;
       }
       $content .= esc_html( $key ) . ': ' . esc_html( print_r( $value, true ) ) . "\n";
     }
-    wp_mail( $to, $subject, $content );
+
+    wp_mail(
+      apply_filters( 'wplf_email_copy_to', $to ),
+      apply_filters( 'wplf_email_copy_subject', $subject ),
+      apply_filters( 'wplf_email_copy_content', $content ),
+      apply_filters( 'wplf_email_copy_headers', '' ),
+      apply_filters( 'wplf_email_copy_attachments', array() )
+    );
   }
 }
-