Allow users to edit their own comments through REST API.

allow-users-to-edit-their-comments.php

<?php
add_filter( 'user_has_cap', 'bea_add_edit_comment', 10, 4 );
/**
 * Allow users to edit their own comments
 *
 * @param array   $allcaps An array of all the user's capabilities.
 * @param array   $caps    Actual capabilities for meta capability.
 * @param array   $args    Optional parameters passed to has_cap(), typically object ID.
 * @param \WP_User $user    The user object.
 *
 * @return mixed
 */
function bea_add_edit_comment( $allcaps, $caps, $args, $user ) {
  // As working with REST Api only
  if ( ! defined( 'REST_REQUEST' ) || true !== REST_REQUEST ) {
  	return $allcaps;
  }
  
  // Always allow the user to moderate comments
  if ( in_array( 'moderate_comments', $caps ) ) {
  	$allcaps['moderate_comments'] = true;
  	return $allcaps;
  }
  
  // Only modify user capabilities if we are trying to edit a comment
  if ( 'edit_comment' !== $args[0] ) {
  	return $allcaps;
  }
  
  /*
   * We need to be sure we have three arguments
   * $args[0] => the capability we want to allow for the user
   * $args[1] => the current user id
   * $args[2] => the current comment id
   */
  if ( count( $args ) < 3 ) {
  	return $allcaps;
  }
  
  // We need a valid comment
  $comment = get_comment( $args[2] );
  if ( is_null( $comment ) ) {
  	return $allcaps;
  }
  
  /*
   * We are checking if the current user are the one who wrote
   * the current comment. If it's the case then add the required
   * permissions for the edit process to succeed
   */
  if ( Functions::user_can_manage_comment( $comment, $user->ID ) ) {
  	$allcaps['edit_others_posts'] = true;
  	$allcaps['edit_published_posts'] = true;
  }
  
  return $allcaps;
}

Hello,

Thanks for creating this—it's exactly what I'm looking to achieve.

Could you possibly give some direction on how to implement this, though? I tried adding it to my functions.php file, but as you might guess, it throws an error ("syntax error, unexpected 'public' (T_PUBLIC)"). In my quick research, it seems that public functions are declared within classes.

Is that the issue? If so, what class should this be a part of?

Sorry, I'm still stumbling around in the dark when it comes to code.

Any help would be greatly appreciated.

Thanks,
Scott

P.S. If I'm not mistaken, there is an extra closing parenthesis in line 1, after 'add_edit_comment'.

Hi @sharcupine, sorry for the delay ! I never get any notification for your answer.

You right, my bad I pasted it too quickly, in my code it was into a class, but when sharing on gist it should not be wrapped into a class, so I messed up ^^
Anyway I fixed my gist and now fully working, thx for the "issue" 👍