Use comment black list for anti-spam

[Shelob9]

#2880

What Has Changed

I created a new method in the Caldera_Forms class that gets the list of bad words from WordPress. It has a filter so end users can customize. I then copied logic from here https://gist.github.com/them-es/7c8a120ac868f5c4fc474e53a1266c83 to the loop where fields are validated.

How to test

I'm not sure yet. But I think adding words to the block list and submitting form with those words in the fields.

• https://github.com/splorp/wordpress-comment-blacklist
• https://themeisle.com/blog/stop-comment-spam-on-wordpress/

[Zodiac1978]

This needs a refresh after WordPress 5.5
See: https://make.wordpress.org/core/2020/07/23/codebase-language-improvements-in-5-5/

It still works, but on WP 5.5 it would trigger a deprecated warning.

There should be something like this:

if ( false === get_option( 'disallowed_keys' ) ) {
    // Assume this is WP < 5.5. Option does not exist.
} else {
    // Assume this is WP >= 5.5
}