{"id":34,"date":"2008-08-29T18:40:52","date_gmt":"2008-08-29T22:40:52","guid":{"rendered":"http:\/\/www.compdigitec.com\/labs\/?p=34"},"modified":"2008-08-29T18:40:52","modified_gmt":"2008-08-29T22:40:52","slug":"wordpress-author-email-blacklist-patch","status":"publish","type":"post","link":"http:\/\/www.compdigitec.com\/labs\/2008\/08\/29\/wordpress-author-email-blacklist-patch\/","title":{"rendered":"WordPress author email blacklist patch"},"content":{"rendered":"

If you’ve ever needed to block a single comment spammer using multiple IPs, referrers and urls, but the same email, here’s a patch for WordPress 2.5. This patch is released under the GNU General Public License<\/a>.<\/p>\n

Add the following code to wp-comments-post.php after the line “$comment_content\u00a0\u00a0\u00a0\u00a0\u00a0 = trim($_POST[‘comment’]);” (line 30 on v2.5):
\n\/\/\u00a0******\u00a0Start\u00a0of\u00a0comment\u00a0email\u00a0patch\u00a0by\u00a0Compdigitec\u00a0******
\n<\/span>$name <\/span>= <\/span>'comment_author_email_blacklist.txt'<\/span>;
\n<\/span>$blacklist_email <\/span>= <\/span>''<\/span>; <\/span>\/\/ ** You can change the above blacklist file
\n<\/span>$flag <\/span>= <\/span>true<\/span>;
\nif(<\/span>file_exists<\/span>(<\/span>$name<\/span>)\u00a0&& <\/span>is_readable<\/span>(<\/span>$name<\/span>))\u00a0{
\n<\/span>$ble <\/span>= <\/span>trim<\/span>(<\/span>file_get_contents<\/span>(<\/span>$name<\/span>));
\n<\/span>$blacklist_email <\/span>= <\/span>explode<\/span>(<\/span>\"\\n\"<\/span>,<\/span>$ble<\/span>);
\nforeach(<\/span>$blacklist_email <\/span>as <\/span>$value<\/span>)\u00a0{
\nif(<\/span>$comment_author_email <\/span>== <\/span>$value<\/span>)\u00a0{
\n<\/span>$flag <\/span>= <\/span>false<\/span>;
\n}
\n}
\nif(<\/span>$flag <\/span>=== <\/span>false<\/span>)\u00a0{
\n<\/span>wp_die<\/span>(<\/span>__<\/span>(<\/span>'Sorry,\u00a0you\u00a0are\u00a0on\u00a0our\u00a0spam\u00a0blacklist\u00a0and\u00a0therefore\u00a0can\u00a0not\u00a0post\u00a0comments.'<\/span>));
\n}
\n}\u00a0else\u00a0{
\n<\/span>\/\/\u00a0Not\u00a0readable.
\n<\/span>echo <\/span>__<\/span>(<\/span>\"<!--\u00a0Warning:\u00a0Comment\u00a0Email\u00a0Blacklist\u00a0could\u00a0not\u00a0be\u00a0read.\u00a0-->\"<\/span>);
\n}
\n<\/span>\/\/\u00a0******\u00a0End\u00a0of\u00a0comment\u00a0email\u00a0patch\u00a0by\u00a0Compdigitec\u00a0******<\/span><\/code><\/p>\n

Next, create a file called comment_author_email_blacklist.txt (or your custom filename if you changed it above). In the file, add your email addresses to blacklist, one per line. Don’t forget to add testblacklist@example.com to test it.<\/p>\n

If the patch has been installed, log out if you are logged in as the site admin. Then go to any post and try to post a comment (make sure there is some content, even if it is nonsense) with the email as “testblacklist@example.com” (without the quotes). You should be confronted with the following dialog:
\n\"WordPress
\nIf you do, congratulations! You have successfully installed the WordPress author email patch by Compdigitec. You can now proceed to adding more blacklist emails to your blacklist.<\/p>\n

Troubleshooting<\/strong><\/p>\n