Add support for itunes:applepodcastsverify

[eteubert]

via https://community.podlove.org/t/how-to-add-apple-podcast-token-to-claim-existing-show/3429

I already suggested a simple code snippet to use in the thread

<?php
/**
 * Add Apple Podcasts verification tag to RSS feed
 * 
 * This code adds the itunes:applepodcastsverify tag to your podcast RSS feed.
 * This tag is used by Apple Podcasts to verify ownership of your podcast.
 * 
 * Replace 'YOUR_VERIFICATION_TOKEN' with the token provided by Apple Podcasts.
 */

add_action('podlove_rss2_head', function ($feed) {
    // Replace 'YOUR_VERIFICATION_TOKEN' with the actual token provided by Apple
    $verification_token = 'YOUR_VERIFICATION_TOKEN';
    
    // Only output the tag if a token is set
    if ($verification_token && !empty($verification_token)) {
        echo "\n\t".sprintf('<itunes:applepodcastsverify>%s</itunes:applepodcastsverify>', $verification_token);
    }
});

What needs to be done:

• add a setting form field where the user can input the token
• escape the token
• maybe use an existing xml node generation function instead of the plain string used here