From 101c06af99be05ae6db35f33c998a83b15edcd2a Mon Sep 17 00:00:00 2001
From: Teodor Zlatanov <tzz@lifelogs.com>
Date: Wed, 31 Jul 2002 19:35:02 +0000
Subject: [PATCH] added a spam split rule

fixed blackhole rule to work with no IPs found (but it still fails
because of query-dns)

added a spam-split-group ("spam" by default)
---
 lisp/spam.el | 66 ++++++++++++++++++++++++++++++++++++++--------------
 1 file changed, 49 insertions(+), 17 deletions(-)

diff --git a/lisp/spam.el b/lisp/spam.el
index 17f487f2a..9d421762e 100644
--- a/lisp/spam.el
+++ b/lisp/spam.el
@@ -35,25 +35,29 @@
     "relays.visi.com" "rbl.maps.vix.com")
   "List of blackhole servers.")
 
+(defvar spam-split-group "spam" "Default group name for spam-split.")
+
 (defun spam-check-blackholes ()
-  "Check the Recevieved headers for blackholed relays."
+  "Check the Receieved headers for blackholed relays."
   (let ((headers (message-fetch-field "received"))
 	ips matches)
-    (with-temp-buffer
-      (insert headers)
-      (goto-char (point-min))
-      (while (re-search-forward
-	      "\\[\\([0-9]+.[0-9]+.[0-9]+.[0-9]+\\)\\]" nil t)
-	(push (mapconcat 'identity
-			 (nreverse (split-string (match-string 1) "\\."))
-			 ".")
-	      ips)))
-    (dolist (server spam-blackhole-servers)
-      (dolist (ip ips)
-	(when (query-dns (concat ip "." server))
-	  (push (list ip server (query-dns (concat ip "." server) 'TXT))
-		matches))))
-    matches))
+    (when headers
+      (with-temp-buffer
+	(insert headers)
+	(goto-char (point-min))
+	(while (re-search-forward
+		"\\[\\([0-9]+.[0-9]+.[0-9]+.[0-9]+\\)\\]" nil t)
+	  (message "blackhole search found host IP %s" (match-string 1))
+	  (push (mapconcat 'identity
+			   (nreverse (split-string (match-string 1) "\\."))
+			   ".")
+		ips)))
+      (dolist (server spam-blackhole-servers)
+	(dolist (ip ips)
+	  (when (query-dns (concat ip "." server))
+	    (push (list ip server (query-dns (concat ip "." server) 'TXT))
+		  matches))))
+      matches)))
 
 ;;; Black- and white-lists
 
@@ -87,7 +91,8 @@ Optional arg BLACKLIST, if non-nil, means to enter in the blacklist instead."
       (unless (bobp)
 	(insert "\n"))
       (insert address "\n")
-      (save-buffer))))
+      (save-buffer)
+      (spam-refresh-list-cache))))
 
 (defun spam-enter-blacklist (address)
   "Enter ADDRESS into the blacklist."
@@ -128,6 +133,33 @@ Optional arg BLACKLIST, if non-nil, means to enter in the blacklist instead."
 	(setq found t)))
     found))
 
+(defun spam-address-blacklisted-p (address &optional blacklist)
+  (if address
+      (spam-address-whitelisted-p address t)
+    nil))
+
+;; Function for nnmail-split-fancy: returns 'spam' if an article is deemed to be spam
+(defun spam-split ()
+  "Split this message into the `spam' group if it is spam.
+This function can be used as an entry in `nnmail-split-fancy', for
+example like this: (: spam-split)
+
+See the Info node `(gnus)Fancy Mail Splitting' for more details."
+  (interactive)
+
+  ;; refresh the cache if it's necessary
+  (unless spam-whitelist-cache (spam-refresh-list-cache))
+  (unless spam-blacklist-cache (spam-refresh-list-cache))
+
+  (let* ((from (message-fetch-field "from"))
+	 (group nil))
+    (when (spam-check-blackholes)
+      (setq group spam-split-group))
+    (unless (spam-address-whitelisted-p from)	; unless the address is whitelisted,
+      (when (spam-address-blacklisted-p from) ; check if it's blacklisted,
+	(setq group spam-split-group))	; and if so, set the group to spam-split-group
+      group)))
+
 (provide 'spam)
 
 ;;; spam.el ends here
-- 
2.25.1