Modification of bbpress forum “Auto Subscribe” code snippet

[nikhilnaik]

I wanted to seek help in modifying the following piece of code. I have a site with buddypress groups inside which I have bbpress forums for the respective groups. I want the users of the group to be automatically subscribed to the forums within that group. I tried the following code:

add_filter( 'bbp_get_user_subscribe_link', 'invert_get_user_subscribe_link', 10, 4 ); //invert forum subscription
add_filter( 'bbp_is_user_subscribed_to_forum', 'invert_is_user_subscribed_to_forum', 10, 4 ); //invert forum subscription
add_filter( 'bbp_get_forum_subscribers', 'invert_get_forum_subscribers' ); //invert forum subscription
add_filter( 'bbp_is_user_subscribed', 'invert_is_user_subscribed', 10, 4 ); //invert forum subscription

function invert_is_user_subscribed($retval, $user_id, $object_id, $subscribed_ids) {
    if (get_post_type( $object_id ) == bbp_get_forum_post_type())
        return !$retval;
    else
        return $retval;
}

    function strContains($needle, $haystack) {
    if (strpos($haystack, $needle) !== false) {
        return true;
    } else {
        return false;
    }
}

    function invert_get_user_subscribe_link ($html, $r, $user_id, $topic_id) {
    if (strContains( "bbp_unsubscribe", $html )) {
        $html = str_replace("bbp_unsubscribe", "bbp_subscribe", $html);
    } else {
        $html = str_replace("bbp_subscribe", "bbp_unsubscribe", $html);
    }
    return $html;
}

    function invert_get_forum_subscribers( $users ) {
    $args = array('fields' => 'id');
    $all_users = get_users($args);
    $send_to_users    = array_diff($all_users, $users);
    return $send_to_users;
}
    function invert_is_user_subscribed_to_forum( $retval, $user_id, $forum_id, $subscribed_ids ) {
    return !$retval;
}

But there is a problem. Using the following code leads to the user getting subscribed to all the forums of all the groups (even those which they aren’t a part of). I just want them to be automatically subscribed to those forum topics created inside the group which they are a part of. Kindly help me in getting this right.

Posting it here as I did not get response over at bbpress.

Thanks!