spam.el 62.1 KB
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;;; spam.el --- Identifying spam
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;; Copyright (C) 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
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;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
;; Keywords: network

;; This file is part of GNU Emacs.

;; GNU Emacs is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 2, or (at your option)
;; any later version.

;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the
;; GNU General Public License for more details.

;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs; see the file COPYING.  If not, write to the
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;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
;; Boston, MA 02110-1301, USA.
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;;; Commentary:

;;; This module addresses a few aspects of spam control under Gnus.  Page
;;; breaks are used for grouping declarations and documentation relating to
;;; each particular aspect.

;;; The integration with Gnus is not yet complete.  See various `FIXME'
;;; comments, below, for supplementary explanations or discussions.

;;; Several TODO items are marked as such

;; TODO: spam scores, detection of spam in newsgroups, cross-server splitting,
;; remote processing, training through files

;;; Code:

(eval-when-compile (require 'cl))

(require 'gnus-sum)

(require 'gnus-uu)			; because of key prefix issues
;;; for the definitions of group content classification and spam processors
(require 'gnus)
(require 'message)		;for the message-fetch-field functions

;; for nnimap-split-download-body-default
(eval-when-compile (require 'nnimap))

;; autoload executable-find
(eval-and-compile
  ;; executable-find is not autoloaded in Emacs 20
  (autoload 'executable-find "executable"))

;; autoload query-dig
(eval-and-compile
  (autoload 'query-dig "dig"))

;; autoload spam-report
(eval-and-compile
  (autoload 'spam-report-gmane "spam-report"))

;; autoload gnus-registry
(eval-and-compile
  (autoload 'gnus-registry-group-count "gnus-registry")
  (autoload 'gnus-registry-add-group "gnus-registry")
  (autoload 'gnus-registry-store-extra-entry "gnus-registry")
  (autoload 'gnus-registry-fetch-extra "gnus-registry"))

;; autoload query-dns
(eval-and-compile
  (autoload 'query-dns "dns"))

;;; Main parameters.

(defgroup spam nil
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  "Spam configuration."
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  :version "22.1"
  :group 'mail
  :group 'news)
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(defcustom spam-directory (nnheader-concat gnus-directory "spam/")
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  "Directory for spam whitelists and blacklists."
  :type 'directory
  :group 'spam)

(defcustom spam-move-spam-nonspam-groups-only t
  "Whether spam should be moved in non-spam groups only.
When t, only ham and unclassified groups will have their spam moved
to the spam-process-destination.  When nil, spam will also be moved from
spam groups."
  :type 'boolean
  :group 'spam)

(defcustom spam-process-ham-in-nonham-groups nil
  "Whether ham should be processed in non-ham groups."
  :type 'boolean
  :group 'spam)

(defcustom spam-log-to-registry nil
  "Whether spam/ham processing should be logged in the registry."
  :type 'boolean
  :group 'spam)

(defcustom spam-split-symbolic-return nil
  "Whether `spam-split' should work with symbols or group names."
  :type 'boolean
  :group 'spam)

(defcustom spam-split-symbolic-return-positive nil
  "Whether `spam-split' should ALWAYS work with symbols or group names.
Do not set this if you use `spam-split' in a fancy split
  method."
  :type 'boolean
  :group 'spam)

(defcustom spam-process-ham-in-spam-groups nil
  "Whether ham should be processed in spam groups."
  :type 'boolean
  :group 'spam)

(defcustom spam-mark-only-unseen-as-spam t
  "Whether only unseen articles should be marked as spam in spam groups.
When nil, all unread articles in a spam group are marked as
spam.  Set this if you want to leave an article unread in a spam group
without losing it to the automatic spam-marking process."
  :type 'boolean
  :group 'spam)

(defcustom spam-mark-ham-unread-before-move-from-spam-group nil
  "Whether ham should be marked unread before it's moved.
The article is moved out of a spam group according to ham-process-destination.
This variable is an official entry in the international Longest Variable Name
Competition."
  :type 'boolean
  :group 'spam)

(defcustom spam-disable-spam-split-during-ham-respool nil
  "Whether `spam-split' should be ignored while resplitting ham in a process
destination.  This is useful to prevent ham from ending up in the same spam
group after the resplit.  Don't set this to t if you have spam-split as the
last rule in your split configuration."
  :type 'boolean
  :group 'spam)

(defcustom spam-autodetect-recheck-messages nil
  "Should spam.el recheck all meessages when autodetecting?
Normally this is nil, so only unseen messages will be checked."
  :type 'boolean
  :group 'spam)

(defcustom spam-whitelist (expand-file-name "whitelist" spam-directory)
  "The location of the whitelist.
The file format is one regular expression per line.
The regular expression is matched against the address."
  :type 'file
  :group 'spam)

(defcustom spam-blacklist (expand-file-name "blacklist" spam-directory)
  "The location of the blacklist.
The file format is one regular expression per line.
The regular expression is matched against the address."
  :type 'file
  :group 'spam)

(defcustom spam-use-dig t
  "Whether `query-dig' should be used instead of `query-dns'."
  :type 'boolean
  :group 'spam)

(defcustom spam-use-blacklist nil
  "Whether the blacklist should be used by `spam-split'."
  :type 'boolean
  :group 'spam)

(defcustom spam-blacklist-ignored-regexes nil
  "Regular expressions that the blacklist should ignore."
  :type '(repeat (regexp :tag "Regular expression to ignore when blacklisting"))
  :group 'spam)

(defcustom spam-use-whitelist nil
  "Whether the whitelist should be used by `spam-split'."
  :type 'boolean
  :group 'spam)

(defcustom spam-use-whitelist-exclusive nil
  "Whether whitelist-exclusive should be used by `spam-split'.
Exclusive whitelisting means that all messages from senders not in the whitelist
are considered spam."
  :type 'boolean
  :group 'spam)

(defcustom spam-use-blackholes nil
  "Whether blackholes should be used by `spam-split'."
  :type 'boolean
  :group 'spam)

(defcustom spam-use-hashcash nil
  "Whether hashcash payments should be detected by `spam-split'."
  :type 'boolean
  :group 'spam)

(defcustom spam-use-regex-headers nil
  "Whether a header regular expression match should be used by `spam-split'.
Also see the variables `spam-regex-headers-spam' and `spam-regex-headers-ham'."
  :type 'boolean
  :group 'spam)

(defcustom spam-use-regex-body nil
  "Whether a body regular expression match should be used by `spam-split'.
Also see the variables `spam-regex-body-spam' and `spam-regex-body-ham'."
  :type 'boolean
  :group 'spam)

(defcustom spam-use-bogofilter-headers nil
  "Whether bogofilter headers should be used by `spam-split'.
Enable this if you pre-process messages with Bogofilter BEFORE Gnus sees them."
  :type 'boolean
  :group 'spam)

(defcustom spam-use-bogofilter nil
  "Whether bogofilter should be invoked by `spam-split'.
Enable this if you want Gnus to invoke Bogofilter on new messages."
  :type 'boolean
  :group 'spam)

(defcustom spam-use-BBDB nil
  "Whether BBDB should be used by `spam-split'."
  :type 'boolean
  :group 'spam)

(defcustom spam-use-BBDB-exclusive nil
  "Whether BBDB-exclusive should be used by `spam-split'.
Exclusive BBDB means that all messages from senders not in the BBDB are
considered spam."
  :type 'boolean
  :group 'spam)

(defcustom spam-use-ifile nil
  "Whether ifile should be used by `spam-split'."
  :type 'boolean
  :group 'spam)

(defcustom spam-use-stat nil
  "Whether `spam-stat' should be used by `spam-split'."
  :type 'boolean
  :group 'spam)

(defcustom spam-use-spamoracle nil
  "Whether spamoracle should be used by `spam-split'."
  :type 'boolean
  :group 'spam)

(defcustom spam-install-hooks (or
			       spam-use-dig
			       spam-use-blacklist
			       spam-use-whitelist
			       spam-use-whitelist-exclusive
			       spam-use-blackholes
			       spam-use-hashcash
			       spam-use-regex-headers
			       spam-use-regex-body
			       spam-use-bogofilter-headers
			       spam-use-bogofilter
			       spam-use-BBDB
			       spam-use-BBDB-exclusive
			       spam-use-ifile
			       spam-use-stat
			       spam-use-spamoracle)
  "Whether the spam hooks should be installed.
Default to t if one of the spam-use-* variables is set."
  :group 'spam
  :type 'boolean)

(defcustom spam-split-group "spam"
  "Group name where incoming spam should be put by `spam-split'."
  :type 'string
  :group 'spam)

;;; TODO: deprecate this variable, it's confusing since it's a list of strings,
;;; not regular expressions
(defcustom spam-junk-mailgroups (cons
				 spam-split-group
				 '("mail.junk" "poste.pourriel"))
  "Mailgroups with spam contents.
All unmarked article in such group receive the spam mark on group entry."
  :type '(repeat (string :tag "Group"))
  :group 'spam)

(defcustom spam-blackhole-servers '("bl.spamcop.net" "relays.ordb.org"
				    "dev.null.dk" "relays.visi.com")
  "List of blackhole servers."
  :type '(repeat (string :tag "Server"))
  :group 'spam)

(defcustom spam-blackhole-good-server-regex nil
  "String matching IP addresses that should not be checked in the blackholes."
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  :type '(radio (const nil) regexp)
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  :group 'spam)

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(defface spam
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  '((((class color) (type tty) (background dark))
     (:foreground "gray80" :background "gray50"))
    (((class color) (type tty) (background light))
     (:foreground "gray50" :background "gray80"))
    (((class color) (background dark))
     (:foreground "ivory2"))
    (((class color) (background light))
     (:foreground "ivory4"))
    (t :inverse-video t))
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  "Face for spam-marked articles."
  :group 'spam)
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;; backward-compatibility alias
(put 'spam-face 'face-alias 'spam)
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(defcustom spam-face 'spam
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  "Face for spam-marked articles."
  :type 'face
  :group 'spam)

(defcustom spam-regex-headers-spam '("^X-Spam-Flag: YES")
  "Regular expression for positive header spam matches."
  :type '(repeat (regexp :tag "Regular expression to match spam header"))
  :group 'spam)

(defcustom spam-regex-headers-ham '("^X-Spam-Flag: NO")
  "Regular expression for positive header ham matches."
  :type '(repeat (regexp :tag "Regular expression to match ham header"))
  :group 'spam)

(defcustom spam-regex-body-spam '()
  "Regular expression for positive body spam matches."
  :type '(repeat (regexp :tag "Regular expression to match spam body"))
  :group 'spam)

(defcustom spam-regex-body-ham '()
  "Regular expression for positive body ham matches."
  :type '(repeat (regexp :tag "Regular expression to match ham body"))
  :group 'spam)

(defgroup spam-ifile nil
  "Spam ifile configuration."
  :group 'spam)

(defcustom spam-ifile-path (executable-find "ifile")
  "File path of the ifile executable program."
  :type '(choice (file :tag "Location of ifile")
		 (const :tag "ifile is not installed"))
  :group 'spam-ifile)

(defcustom spam-ifile-database-path nil
  "File path of the ifile database."
  :type '(choice (file :tag "Location of the ifile database")
		 (const :tag "Use the default"))
  :group 'spam-ifile)

(defcustom spam-ifile-spam-category "spam"
  "Name of the spam ifile category."
  :type 'string
  :group 'spam-ifile)

(defcustom spam-ifile-ham-category nil
  "Name of the ham ifile category.
If nil, the current group name will be used."
  :type '(choice (string :tag "Use a fixed category")
		 (const :tag "Use the current group name"))
  :group 'spam-ifile)

(defcustom spam-ifile-all-categories nil
  "Whether the ifile check will return all categories, or just spam.
Set this to t if you want to use the `spam-split' invocation of ifile as
your main source of newsgroup names."
  :type 'boolean
  :group 'spam-ifile)

(defgroup spam-bogofilter nil
  "Spam bogofilter configuration."
  :group 'spam)

(defcustom spam-bogofilter-path (executable-find "bogofilter")
  "File path of the Bogofilter executable program."
  :type '(choice (file :tag "Location of bogofilter")
		 (const :tag "Bogofilter is not installed"))
  :group 'spam-bogofilter)

(defcustom spam-bogofilter-header "X-Bogosity"
  "The header that Bogofilter inserts in messages."
  :type 'string
  :group 'spam-bogofilter)

(defcustom spam-bogofilter-spam-switch "-s"
  "The switch that Bogofilter uses to register spam messages."
  :type 'string
  :group 'spam-bogofilter)

(defcustom spam-bogofilter-ham-switch "-n"
  "The switch that Bogofilter uses to register ham messages."
  :type 'string
  :group 'spam-bogofilter)

(defcustom spam-bogofilter-spam-strong-switch "-S"
  "The switch that Bogofilter uses to unregister ham messages."
  :type 'string
  :group 'spam-bogofilter)

(defcustom spam-bogofilter-ham-strong-switch "-N"
  "The switch that Bogofilter uses to unregister spam messages."
  :type 'string
  :group 'spam-bogofilter)

(defcustom spam-bogofilter-bogosity-positive-spam-header "^\\(Yes\\|Spam\\)"
  "The regex on `spam-bogofilter-header' for positive spam identification."
  :type 'regexp
  :group 'spam-bogofilter)

(defcustom spam-bogofilter-database-directory nil
  "Directory path of the Bogofilter databases."
  :type '(choice (directory
		  :tag "Location of the Bogofilter database directory")
		 (const :tag "Use the default"))
  :group 'spam-bogofilter)

(defgroup spam-spamoracle nil
  "Spam spamoracle configuration."
  :group 'spam)

(defcustom spam-spamoracle-database nil
  "Location of spamoracle database file. When nil, use the default
spamoracle database."
  :type '(choice (directory :tag "Location of spamoracle database file.")
		 (const :tag "Use the default"))
  :group 'spam-spamoracle)

(defcustom spam-spamoracle-binary (executable-find "spamoracle")
  "Location of the spamoracle binary."
  :type '(choice (directory :tag "Location of the spamoracle binary")
		 (const :tag "Use the default"))
  :group 'spam-spamoracle)

;;; Key bindings for spam control.

(gnus-define-keys gnus-summary-mode-map
  "St" spam-bogofilter-score
  "Sx" gnus-summary-mark-as-spam
  "Mst" spam-bogofilter-score
  "Msx" gnus-summary-mark-as-spam
  "\M-d" gnus-summary-mark-as-spam)

(defvar spam-old-ham-articles nil
  "List of old ham articles, generated when a group is entered.")

(defvar spam-old-spam-articles nil
  "List of old spam articles, generated when a group is entered.")

(defvar spam-split-disabled nil
  "If non-nil, `spam-split' is disabled, and always returns nil.")

(defvar spam-split-last-successful-check nil
  "`spam-split' will set this to nil or a spam-use-XYZ check if it
  finds ham or spam.")

;; convenience functions
(defun spam-xor (a b)
  "Logical exclusive `or'."
  (and (or a b) (not (and a b))))

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(defun spam-group-ham-mark-p (group mark &optional spam)
  (when (stringp group)
    (let* ((marks (spam-group-ham-marks group spam))
	   (marks (if (symbolp mark)
		      marks
		    (mapcar 'symbol-value marks))))
      (memq mark marks))))

(defun spam-group-spam-mark-p (group mark)
  (spam-group-ham-mark-p group mark t))

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(defun spam-group-ham-marks (group &optional spam)
  (when (stringp group)
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    (let* ((marks (if spam
		      (gnus-parameter-spam-marks group)
		    (gnus-parameter-ham-marks group)))
	   (marks (car marks))
	   (marks (if (listp (car marks)) (car marks) marks)))
      marks)))

(defun spam-group-spam-marks (group)
  (spam-group-ham-marks group t))
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(defun spam-group-spam-contents-p (group)
  (if (stringp group)
      (or (member group spam-junk-mailgroups)
	  (memq 'gnus-group-spam-classification-spam
		(gnus-parameter-spam-contents group)))
    nil))

(defun spam-group-ham-contents-p (group)
  (if (stringp group)
      (memq 'gnus-group-spam-classification-ham
	    (gnus-parameter-spam-contents group))
    nil))

(defvar spam-list-of-processors
  '((gnus-group-spam-exit-processor-report-gmane spam spam-use-gmane)
    (gnus-group-spam-exit-processor-bogofilter   spam spam-use-bogofilter)
    (gnus-group-spam-exit-processor-blacklist    spam spam-use-blacklist)
    (gnus-group-spam-exit-processor-ifile        spam spam-use-ifile)
    (gnus-group-spam-exit-processor-stat         spam spam-use-stat)
    (gnus-group-spam-exit-processor-spamoracle   spam spam-use-spamoracle)
    (gnus-group-ham-exit-processor-ifile         ham spam-use-ifile)
    (gnus-group-ham-exit-processor-bogofilter    ham spam-use-bogofilter)
    (gnus-group-ham-exit-processor-stat          ham spam-use-stat)
    (gnus-group-ham-exit-processor-whitelist     ham spam-use-whitelist)
    (gnus-group-ham-exit-processor-BBDB          ham spam-use-BBDB)
    (gnus-group-ham-exit-processor-copy          ham spam-use-ham-copy)
    (gnus-group-ham-exit-processor-spamoracle    ham spam-use-spamoracle))
  "The spam-list-of-processors list contains pairs associating a
ham/spam exit processor variable with a classification and a
spam-use-* variable.")

(defun spam-group-processor-p (group processor)
  (if (and (stringp group)
	   (symbolp processor))
      (or (member processor (nth 0 (gnus-parameter-spam-process group)))
	  (spam-group-processor-multiple-p
	   group
	   (cdr-safe (assoc processor spam-list-of-processors))))
    nil))

(defun spam-group-processor-multiple-p (group processor-info)
  (let* ((classification (nth 0 processor-info))
	 (check (nth 1 processor-info))
	 (parameters (nth 0 (gnus-parameter-spam-process group)))
	 found)
    (dolist (parameter parameters)
      (when (and (null found)
		 (listp parameter)
		 (eq classification (nth 0 parameter))
		 (eq check (nth 1 parameter)))
	(setq found t)))
    found))

(defun spam-group-spam-processor-report-gmane-p (group)
  (spam-group-processor-p group 'gnus-group-spam-exit-processor-report-gmane))

(defun spam-group-spam-processor-bogofilter-p (group)
  (spam-group-processor-p group 'gnus-group-spam-exit-processor-bogofilter))

(defun spam-group-spam-processor-blacklist-p (group)
  (spam-group-processor-p group 'gnus-group-spam-exit-processor-blacklist))

(defun spam-group-spam-processor-ifile-p (group)
  (spam-group-processor-p group 'gnus-group-spam-exit-processor-ifile))

(defun spam-group-ham-processor-ifile-p (group)
  (spam-group-processor-p group 'gnus-group-ham-exit-processor-ifile))

(defun spam-group-spam-processor-spamoracle-p (group)
  (spam-group-processor-p group 'gnus-group-spam-exit-processor-spamoracle))

(defun spam-group-ham-processor-bogofilter-p (group)
  (spam-group-processor-p group 'gnus-group-ham-exit-processor-bogofilter))

(defun spam-group-spam-processor-stat-p (group)
  (spam-group-processor-p group 'gnus-group-spam-exit-processor-stat))

(defun spam-group-ham-processor-stat-p (group)
  (spam-group-processor-p group 'gnus-group-ham-exit-processor-stat))

(defun spam-group-ham-processor-whitelist-p (group)
  (spam-group-processor-p group 'gnus-group-ham-exit-processor-whitelist))

(defun spam-group-ham-processor-BBDB-p (group)
  (spam-group-processor-p group 'gnus-group-ham-exit-processor-BBDB))

(defun spam-group-ham-processor-copy-p (group)
  (spam-group-processor-p group 'gnus-group-ham-exit-processor-copy))

(defun spam-group-ham-processor-spamoracle-p (group)
  (spam-group-processor-p group 'gnus-group-ham-exit-processor-spamoracle))

;;; Summary entry and exit processing.

(defun spam-summary-prepare ()
  (setq spam-old-ham-articles
	(spam-list-articles gnus-newsgroup-articles 'ham))
  (setq spam-old-spam-articles
	(spam-list-articles gnus-newsgroup-articles 'spam))
  (spam-mark-junk-as-spam-routine))

;; The spam processors are invoked for any group, spam or ham or neither
(defun spam-summary-prepare-exit ()
  (unless gnus-group-is-exiting-without-update-p
    (gnus-message 6 "Exiting summary buffer and applying spam rules")

    ;; first of all, unregister any articles that are no longer ham or spam
    ;; we have to iterate over the processors, or else we'll be too slow
    (dolist (classification '(spam ham))
      (let* ((old-articles (if (eq classification 'spam)
			       spam-old-spam-articles
			     spam-old-ham-articles))
	     (new-articles (spam-list-articles
			    gnus-newsgroup-articles
			    classification))
	     (changed-articles (gnus-set-difference old-articles new-articles)))
	;; now that we have the changed articles, we go through the processors
	(dolist (processor-param spam-list-of-processors)
	  (let ((processor (nth 0 processor-param))
		(processor-classification (nth 1 processor-param))
		(check (nth 2 processor-param))
		unregister-list)
	    (dolist (article changed-articles)
	      (let ((id (spam-fetch-field-message-id-fast article)))
		(when (spam-log-unregistration-needed-p
		       id 'process classification check)
		  (push article unregister-list))))
	    ;; call spam-register-routine with specific articles to unregister,
	    ;; when there are articles to unregister and the check is enabled
	    (when (and unregister-list (symbol-value check))
	      (spam-register-routine classification check t unregister-list))))))

    ;; find all the spam processors applicable to this group
    (dolist (processor-param spam-list-of-processors)
      (let ((processor (nth 0 processor-param))
	    (classification (nth 1 processor-param))
	    (check (nth 2 processor-param)))
	(when (and (eq 'spam classification)
		   (spam-group-processor-p gnus-newsgroup-name processor))
	  (spam-register-routine classification check))))

    (if spam-move-spam-nonspam-groups-only
	(when (not (spam-group-spam-contents-p gnus-newsgroup-name))
	  (spam-mark-spam-as-expired-and-move-routine
	   (gnus-parameter-spam-process-destination gnus-newsgroup-name)))
      (gnus-message 5 "Marking spam as expired and moving it to %s"
		    gnus-newsgroup-name)
      (spam-mark-spam-as-expired-and-move-routine
       (gnus-parameter-spam-process-destination gnus-newsgroup-name)))

    ;; now we redo spam-mark-spam-as-expired-and-move-routine to only
    ;; expire spam, in case the above did not expire them
    (gnus-message 5 "Marking spam as expired without moving it")
    (spam-mark-spam-as-expired-and-move-routine nil)

    (when (or (spam-group-ham-contents-p gnus-newsgroup-name)
	      (and (spam-group-spam-contents-p gnus-newsgroup-name)
		   spam-process-ham-in-spam-groups)
	      spam-process-ham-in-nonham-groups)
      ;; find all the ham processors applicable to this group
      (dolist (processor-param spam-list-of-processors)
	(let ((processor (nth 0 processor-param))
	      (classification (nth 1 processor-param))
	      (check (nth 2 processor-param)))
	  (when (and (eq 'ham classification)
		     (spam-group-processor-p gnus-newsgroup-name processor))
	    (spam-register-routine classification check)))))

    (when (spam-group-ham-processor-copy-p gnus-newsgroup-name)
      (gnus-message 5 "Copying ham")
      (spam-ham-copy-routine
       (gnus-parameter-ham-process-destination gnus-newsgroup-name)))

    ;; now move all ham articles out of spam groups
    (when (spam-group-spam-contents-p gnus-newsgroup-name)
      (gnus-message 5 "Moving ham messages from spam group")
      (spam-ham-move-routine
       (gnus-parameter-ham-process-destination gnus-newsgroup-name))))

  (setq spam-old-ham-articles nil)
  (setq spam-old-spam-articles nil))

(defun spam-mark-junk-as-spam-routine ()
  ;; check the global list of group names spam-junk-mailgroups and the
  ;; group parameters
  (when (spam-group-spam-contents-p gnus-newsgroup-name)
    (gnus-message 5 "Marking %s articles as spam"
		  (if spam-mark-only-unseen-as-spam
		      "unseen"
		    "unread"))
    (let ((articles (if spam-mark-only-unseen-as-spam
			gnus-newsgroup-unseen
		      gnus-newsgroup-unreads)))
      (dolist (article articles)
	(gnus-summary-mark-article article gnus-spam-mark)))))

(defun spam-mark-spam-as-expired-and-move-routine (&rest groups)
  (if (and (car-safe groups) (listp (car-safe groups)))
      (apply 'spam-mark-spam-as-expired-and-move-routine (car groups))
    (gnus-summary-kill-process-mark)
    (let ((articles gnus-newsgroup-articles)
	  (backend-supports-deletions
	   (gnus-check-backend-function
	    'request-move-article gnus-newsgroup-name))
	  article tomove deletep)
      (dolist (article articles)
	(when (eq (gnus-summary-article-mark article) gnus-spam-mark)
	  (gnus-summary-mark-article article gnus-expirable-mark)
	  (push article tomove)))

      ;; now do the actual copies
      (dolist (group groups)
	(when (and tomove
		   (stringp group))
	  (dolist (article tomove)
	    (gnus-summary-set-process-mark article))
	  (when tomove
	    (if (or (not backend-supports-deletions)
		    (> (length groups) 1))
		(progn
		  (gnus-summary-copy-article nil group)
		  (setq deletep t))
	      (gnus-summary-move-article nil group)))))

      ;; now delete the articles, if there was a copy done, and the
      ;; backend allows it
      (when (and deletep backend-supports-deletions)
	(dolist (article tomove)
	  (gnus-summary-set-process-mark article))
	(when tomove
	  (let ((gnus-novice-user nil))	; don't ask me if I'm sure
	    (gnus-summary-delete-article nil))))

      (gnus-summary-yank-process-mark))))

(defun spam-ham-copy-or-move-routine (copy groups)
  (gnus-summary-kill-process-mark)
  (let ((todo (spam-list-articles gnus-newsgroup-articles 'ham))
	(backend-supports-deletions
	 (gnus-check-backend-function
	  'request-move-article gnus-newsgroup-name))
	(respool-method (gnus-find-method-for-group gnus-newsgroup-name))
	article mark todo deletep respool)

    (when (member 'respool groups)
      (setq respool t)			; boolean for later
      (setq groups '("fake"))) ; when respooling, groups are dynamic so fake it

    ;; now do the actual move
    (dolist (group groups)
      (when (and todo (stringp group))
	(dolist (article todo)
	  (when spam-mark-ham-unread-before-move-from-spam-group
	    (gnus-summary-mark-article article gnus-unread-mark))
	  (gnus-summary-set-process-mark article))

	(if respool			   ; respooling is with a "fake" group
	    (let ((spam-split-disabled
		   (or spam-split-disabled
		       spam-disable-spam-split-during-ham-respool)))
	      (gnus-summary-respool-article nil respool-method))
	  (if (or (not backend-supports-deletions) ; else, we are not respooling
		  (> (length groups) 1))
	      (progn		    ; if copying, copy and set deletep
		(gnus-summary-copy-article nil group)
		(setq deletep t))
	    (gnus-summary-move-article nil group))))) ; else move articles

    ;; now delete the articles, unless a) copy is t, and there was a copy done
    ;;                                 b) a move was done to a single group
    ;;                                 c) backend-supports-deletions is nil
    (unless copy
      (when (and deletep backend-supports-deletions)
	(dolist (article todo)
	  (gnus-summary-set-process-mark article))
	(when todo
	  (let ((gnus-novice-user nil))	; don't ask me if I'm sure
	    (gnus-summary-delete-article nil))))))

  (gnus-summary-yank-process-mark))

(defun spam-ham-copy-routine (&rest groups)
  (if (and (car-safe groups) (listp (car-safe groups)))
      (apply 'spam-ham-copy-routine (car groups))
    (spam-ham-copy-or-move-routine t groups)))

(defun spam-ham-move-routine (&rest groups)
  (if (and (car-safe groups) (listp (car-safe groups)))
      (apply 'spam-ham-move-routine (car groups))
    (spam-ham-copy-or-move-routine nil groups)))

(eval-and-compile
  (defalias 'spam-point-at-eol (if (fboundp 'point-at-eol)
				   'point-at-eol
				 'line-end-position)))

(defun spam-get-article-as-string (article)
  (let ((article-buffer (spam-get-article-as-buffer article))
	article-string)
    (when article-buffer
      (save-window-excursion
	(set-buffer article-buffer)
	(setq article-string (buffer-string))))
    article-string))

(defun spam-get-article-as-buffer (article)
  (let ((article-buffer))
    (when (numberp article)
      (save-window-excursion
	(gnus-summary-goto-subject article)
	(gnus-summary-show-article t)
	(setq article-buffer (get-buffer gnus-article-buffer))))
    article-buffer))

;; disabled for now
;; (defun spam-get-article-as-filename (article)
;;   (let ((article-filename))
;;     (when (numberp article)
;;       (nnml-possibly-change-directory
;;        (gnus-group-real-name gnus-newsgroup-name))
;;       (setq article-filename (expand-file-name
;;	  		        (int-to-string article) nnml-current-directory)))
;;     (if (file-exists-p article-filename)
;; 	article-filename
;;       nil)))

(defun spam-fetch-field-from-fast (article)
  "Fetch the `from' field quickly, using the internal gnus-data-list function"
  (if (and (numberp article)
	   (assoc article (gnus-data-list nil)))
      (mail-header-from
       (gnus-data-header (assoc article (gnus-data-list nil))))
    nil))

(defun spam-fetch-field-subject-fast (article)
  "Fetch the `subject' field quickly, using the internal
  gnus-data-list function"
  (if (and (numberp article)
	   (assoc article (gnus-data-list nil)))
      (mail-header-subject
       (gnus-data-header (assoc article (gnus-data-list nil))))
    nil))

(defun spam-fetch-field-message-id-fast (article)
  "Fetch the `Message-ID' field quickly, using the internal
  gnus-data-list function"
  (if (and (numberp article)
	   (assoc article (gnus-data-list nil)))
      (mail-header-message-id
       (gnus-data-header (assoc article (gnus-data-list nil))))
    nil))


;;;; Spam determination.

(defvar spam-list-of-checks
  '((spam-use-blacklist  	 . spam-check-blacklist)
    (spam-use-regex-headers  	 . spam-check-regex-headers)
    (spam-use-regex-body  	 . spam-check-regex-body)
    (spam-use-whitelist  	 . spam-check-whitelist)
    (spam-use-BBDB	 	 . spam-check-BBDB)
    (spam-use-ifile	 	 . spam-check-ifile)
    (spam-use-spamoracle         . spam-check-spamoracle)
    (spam-use-stat	 	 . spam-check-stat)
    (spam-use-blackholes 	 . spam-check-blackholes)
    (spam-use-hashcash  	 . spam-check-hashcash)
    (spam-use-bogofilter-headers . spam-check-bogofilter-headers)
    (spam-use-bogofilter 	 . spam-check-bogofilter))
  "The spam-list-of-checks list contains pairs associating a
parameter variable with a spam checking function.  If the
parameter variable is true, then the checking function is called,
and its value decides what happens.  Each individual check may
return nil, t, or a mailgroup name.  The value nil means that the
check does not yield a decision, and so, that further checks are
needed.  The value t means that the message is definitely not
spam, and that further spam checks should be inhibited.
Otherwise, a mailgroup name or the symbol 'spam (depending on
spam-split-symbolic-return) is returned where the mail should go,
and further checks are also inhibited.  The usual mailgroup name
is the value of `spam-split-group', meaning that the message is
definitely a spam.")

(defvar spam-list-of-statistical-checks
  '(spam-use-ifile
    spam-use-regex-body
    spam-use-stat
    spam-use-bogofilter
    spam-use-spamoracle)
  "The spam-list-of-statistical-checks list contains all the mail
splitters that need to have the full message body available.")

;;;TODO: modify to invoke self with each check if invoked without specifics
(defun spam-split (&rest specific-checks)
  "Split this message into the `spam' group if it is spam.
This function can be used as an entry in the variable `nnmail-split-fancy',
for example like this: (: spam-split).  It can take checks as
parameters.  A string as a parameter will set the
spam-split-group to that string.

See the Info node `(gnus)Fancy Mail Splitting' for more details."
  (interactive)
  (setq spam-split-last-successful-check nil)
  (unless spam-split-disabled
    (let ((spam-split-group-choice spam-split-group))
      (dolist (check specific-checks)
	(when (stringp check)
	  (setq spam-split-group-choice check)
	  (setq specific-checks (delq check specific-checks))))

      (let ((spam-split-group spam-split-group-choice))
	(save-excursion
	  (save-restriction
	    (dolist (check spam-list-of-statistical-checks)
	      (when (and (symbolp check) (symbol-value check))
		(widen)
		(gnus-message 8 "spam-split: widening the buffer (%s requires it)"
			      (symbol-name check))
		(return)))
	    ;;   (progn (widen) (debug (buffer-string)))
	    (let ((list-of-checks spam-list-of-checks)
		  decision)
	      (while (and list-of-checks (not decision))
		(let ((pair (pop list-of-checks)))
		  (when (and (symbol-value (car pair))
			     (or (null specific-checks)
				 (memq (car pair) specific-checks)))
		    (gnus-message 5 "spam-split: calling the %s function"
				  (symbol-name (cdr pair)))
		    (setq decision (funcall (cdr pair)))
		    ;; if we got a decision at all, save the current check
		    (when decision
		      (setq spam-split-last-successful-check (car pair)))

		    (when (eq decision 'spam)
		      (if spam-split-symbolic-return
			  (setq decision spam-split-group)
			(gnus-error
			 5
			 (format "spam-split got %s but %s is nil"
				 (symbol-name decision)
				 (symbol-name spam-split-symbolic-return))))))))
	      (if (eq decision t)
		  (if spam-split-symbolic-return-positive 'ham nil)
		decision))))))))

(defun spam-find-spam ()
  "This function will detect spam in the current newsgroup using spam-split."
  (interactive)

  (let* ((group gnus-newsgroup-name)
	 (autodetect (gnus-parameter-spam-autodetect group))
	 (methods (gnus-parameter-spam-autodetect-methods group))
	 (first-method (nth 0 methods)))
  (when (and autodetect
	     (not (equal first-method 'none)))
    (mapcar
     (lambda (article)
       (let ((id (spam-fetch-field-message-id-fast article))
	     (subject (spam-fetch-field-subject-fast article))
	     (sender (spam-fetch-field-from-fast article)))
	 (unless (and spam-log-to-registry
		      (spam-log-registered-p id 'incoming))
	   (let* ((spam-split-symbolic-return t)
		  (spam-split-symbolic-return-positive t)
		  (split-return
		   (with-temp-buffer
		     (gnus-request-article-this-buffer
		      article
		      group)
		     (if (or (null first-method)
			     (equal first-method 'default))
			 (spam-split)
		       (apply 'spam-split methods)))))
	     (if (equal split-return 'spam)
		 (gnus-summary-mark-article article gnus-spam-mark))

	     (when (and split-return spam-log-to-registry)
	       (when (zerop (gnus-registry-group-count id))
		 (gnus-registry-add-group
		  id group subject sender))

	       (spam-log-processing-to-registry
		id
		'incoming
		split-return
		spam-split-last-successful-check
		group))))))
     (if spam-autodetect-recheck-messages
	 gnus-newsgroup-articles
       gnus-newsgroup-unseen)))))

(defvar spam-registration-functions
  ;; first the ham register, second the spam register function
  ;; third the ham unregister, fourth the spam unregister function
  '((spam-use-blacklist  nil
			 spam-blacklist-register-routine
			 nil
			 spam-blacklist-unregister-routine)
    (spam-use-whitelist  spam-whitelist-register-routine
			 nil
			 spam-whitelist-unregister-routine
			 nil)
    (spam-use-BBDB	 spam-BBDB-register-routine
			 nil
			 spam-BBDB-unregister-routine
			 nil)
    (spam-use-ifile	 spam-ifile-register-ham-routine
			 spam-ifile-register-spam-routine
			 spam-ifile-unregister-ham-routine
			 spam-ifile-unregister-spam-routine)
    (spam-use-spamoracle spam-spamoracle-learn-ham
			 spam-spamoracle-learn-spam
			 spam-spamoracle-unlearn-ham
			 spam-spamoracle-unlearn-spam)
    (spam-use-stat	 spam-stat-register-ham-routine
			 spam-stat-register-spam-routine
			 spam-stat-unregister-ham-routine
			 spam-stat-unregister-spam-routine)
    ;; note that spam-use-gmane is not a legitimate check
    (spam-use-gmane      nil
			 spam-report-gmane-register-routine
			 ;; does Gmane support unregistration?
			 nil
			 nil)
    (spam-use-bogofilter spam-bogofilter-register-ham-routine
			 spam-bogofilter-register-spam-routine
			 spam-bogofilter-unregister-ham-routine
			 spam-bogofilter-unregister-spam-routine))
  "The spam-registration-functions list contains pairs
associating a parameter variable with the ham and spam
registration functions, and the ham and spam unregistration
functions")

(defun spam-classification-valid-p (classification)
  (or  (eq classification 'spam)
       (eq classification 'ham)))

(defun spam-process-type-valid-p (process-type)
  (or  (eq process-type 'incoming)
       (eq process-type 'process)))

(defun spam-registration-check-valid-p (check)
  (assoc check spam-registration-functions))

(defun spam-unregistration-check-valid-p (check)
  (assoc check spam-registration-functions))

(defun spam-registration-function (classification check)
  (let ((flist (cdr-safe (assoc check spam-registration-functions))))
    (if (eq classification 'spam)
	(nth 1 flist)
      (nth 0 flist))))

(defun spam-unregistration-function (classification check)
  (let ((flist (cdr-safe (assoc check spam-registration-functions))))
    (if (eq classification 'spam)
	(nth 3 flist)
      (nth 2 flist))))

(defun spam-list-articles (articles classification)
1053 1054 1055 1056
  (let ((mark-check (if (eq classification 'spam)
			'spam-group-spam-mark-p
		      'spam-group-ham-mark-p))
	list mark-cache-yes mark-cache-no)
1057
    (dolist (article articles)
1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069
      (let ((mark (gnus-summary-article-mark article)))
	(unless (memq mark mark-cache-no)
	  (if (memq mark mark-cache-yes)
	      (push article list)
	    ;; else, we have to actually check the mark
	    (if (funcall mark-check
			 gnus-newsgroup-name
			 mark)
		(progn
		  (push article list)
		  (push mark mark-cache-yes))
	      (push mark mark-cache-no))))))
1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276
    list))

(defun spam-register-routine (classification
			      check
			      &optional unregister
			      specific-articles)
  (when (and (spam-classification-valid-p classification)
	     (spam-registration-check-valid-p check))
    (let* ((register-function
	    (spam-registration-function classification check))
	   (unregister-function
	    (spam-unregistration-function classification check))
	   (run-function (if unregister
			     unregister-function
			   register-function))
	   (log-function (if unregister
			     'spam-log-undo-registration
			   'spam-log-processing-to-registry))
	   article articles)

      (when run-function
	;; make list of articles, using specific-articles if given
	(setq articles (or specific-articles
			   (spam-list-articles
			    gnus-newsgroup-articles
			    classification)))
	;; process them
	(gnus-message 5 "%s %d %s articles with classification %s, check %s"
		      (if unregister "Unregistering" "Registering")
		      (length articles)
		      (if specific-articles "specific" "")
		      (symbol-name classification)
		      (symbol-name check))
	(funcall run-function articles)
	;; now log all the registrations (or undo them, depending on unregister)
	(dolist (article articles)
	  (funcall log-function
		   (spam-fetch-field-message-id-fast article)
		   'process
		   classification
		   check
		   gnus-newsgroup-name))))))

;;; log a ham- or spam-processor invocation to the registry
(defun spam-log-processing-to-registry (id type classification check group)
  (when spam-log-to-registry
    (if (and (stringp id)
	     (stringp group)
	     (spam-process-type-valid-p type)
	     (spam-classification-valid-p classification)
	     (spam-registration-check-valid-p check))
	(let ((cell-list (cdr-safe (gnus-registry-fetch-extra id type)))
	      (cell (list classification check group)))
	  (push cell cell-list)
	  (gnus-registry-store-extra-entry
	   id
	   type
	   cell-list))

      (gnus-message 5 (format "%s called with bad ID, type, classification, check, or group"
			      "spam-log-processing-to-registry")))))

;;; check if a ham- or spam-processor registration has been done
(defun spam-log-registered-p (id type)
  (when spam-log-to-registry
    (if (and (stringp id)
	     (spam-process-type-valid-p type))
	(cdr-safe (gnus-registry-fetch-extra id type))
      (progn
	(gnus-message 5 (format "%s called with bad ID, type, classification, or check"
				"spam-log-registered-p"))
	nil))))

;;; check if a ham- or spam-processor registration needs to be undone
(defun spam-log-unregistration-needed-p (id type classification check)
  (when spam-log-to-registry
    (if (and (stringp id)
	     (spam-process-type-valid-p type)
	     (spam-classification-valid-p classification)
	     (spam-registration-check-valid-p check))
	(let ((cell-list (cdr-safe (gnus-registry-fetch-extra id type)))
	      found)
	  (dolist (cell cell-list)
	    (unless found
	      (when (and (eq classification (nth 0 cell))
			 (eq check (nth 1 cell)))
		(setq found t))))
	  found)
      (progn
	(gnus-message 5 (format "%s called with bad ID, type, classification, or check"
				"spam-log-unregistration-needed-p"))
	nil))))


;;; undo a ham- or spam-processor registration (the group is not used)
(defun spam-log-undo-registration (id type classification check &optional group)
  (when (and spam-log-to-registry
	     (spam-log-unregistration-needed-p id type classification check))
    (if (and (stringp id)
	     (spam-process-type-valid-p type)
	     (spam-classification-valid-p classification)
	     (spam-registration-check-valid-p check))
	(let ((cell-list (cdr-safe (gnus-registry-fetch-extra id type)))
	      new-cell-list found)
	  (dolist (cell cell-list)
	    (unless (and (eq classification (nth 0 cell))
			 (eq check (nth 1 cell)))
	      (push cell new-cell-list)))
	  (gnus-registry-store-extra-entry
	   id
	   type
	   new-cell-list))
      (progn
	(gnus-message 5 (format "%s called with bad ID, type, check, or group"
				"spam-log-undo-registration"))
	nil))))

;;; set up IMAP widening if it's necessary
(defun spam-setup-widening ()
  (dolist (check spam-list-of-statistical-checks)
    (when (symbol-value check)
      (setq nnimap-split-download-body-default t))))


;;;; Regex body

(defun spam-check-regex-body ()
  (let ((spam-regex-headers-ham spam-regex-body-ham)
	(spam-regex-headers-spam spam-regex-body-spam))
    (spam-check-regex-headers t)))


;;;; Regex headers

(defun spam-check-regex-headers (&optional body)
  (let ((type (if body "body" "header"))
	(spam-split-group (if spam-split-symbolic-return
			      'spam
			    spam-split-group))
	ret found)
    (dolist (h-regex spam-regex-headers-ham)
      (unless found
	(goto-char (point-min))
	(when (re-search-forward h-regex nil t)
	  (message "Ham regex %s search positive." type)
	  (setq found t))))
    (dolist (s-regex spam-regex-headers-spam)
      (unless found
	(goto-char (point-min))
	(when (re-search-forward s-regex nil t)
	  (message "Spam regex %s search positive." type)
	  (setq found t)
	  (setq ret spam-split-group))))
    ret))


;;;; Blackholes.

(defun spam-reverse-ip-string (ip)
  (when (stringp ip)
    (mapconcat 'identity
	       (nreverse (split-string ip "\\."))
	       ".")))

(defun spam-check-blackholes ()
  "Check the Received headers for blackholed relays."
  (let ((headers (nnmail-fetch-field "received"))
	(spam-split-group (if spam-split-symbolic-return
			      'spam
			    spam-split-group))
	ips matches)
    (when headers
      (with-temp-buffer
	(insert headers)
	(goto-char (point-min))
	(gnus-message 5 "Checking headers for relay addresses")
	(while (re-search-forward
		"\\([0-9]+\\.[0-9]+\\.[0-9]+\\.[0-9]+\\)" nil t)
	  (gnus-message 9 "Blackhole search found host IP %s." (match-string 1))
	  (push (spam-reverse-ip-string (match-string 1))
		ips)))
      (dolist (server spam-blackhole-servers)
	(dolist (ip ips)
	  (unless (and spam-blackhole-good-server-regex
		       ;; match the good-server-regex against the reversed (again) IP string
		       (string-match
			spam-blackhole-good-server-regex
			(spam-reverse-ip-string ip)))
	    (unless matches
	      (let ((query-string (concat ip "." server)))
		(if spam-use-dig
		    (let ((query-result (query-dig query-string)))
		      (when query-result
			(gnus-message 5 "(DIG): positive blackhole check '%s'"
				      query-result)
			(push (list ip server query-result)
			      matches)))
		  ;; else, if not using dig.el
		  (when (query-dns query-string)
		    (gnus-message 5 "positive blackhole check")
		    (push (list ip server (query-dns query-string 'TXT))
			  matches)))))))))
    (when matches
      spam-split-group)))

;;;; Hashcash.

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(eval-when-compile
  (autoload 'mail-check-payment "hashcash"))

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(condition-case nil
    (progn
      (require 'hashcash)

      (defun spam-check-hashcash ()
	"Check the headers for hashcash payments."
	(mail-check-payment)))	 ;mail-check-payment returns a boolean

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  (file-error))
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;;;; BBDB

;;; original idea for spam-check-BBDB from Alexander Kotelnikov
;;; <sacha@giotto.sj.ru>

;; all this is done inside a condition-case to trap errors

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(eval-when-compile
  (autoload 'bbdb-buffer "bbdb")
  (autoload 'bbdb-create-internal "bbdb")
  (autoload 'bbdb-search-simple "bbdb"))

(eval-and-compile
  (when (condition-case nil
	    (progn
	      (require 'bbdb)
	      (require 'bbdb-com))
	  (file-error
	   (defalias 'spam-BBDB-register-routine 'ignore)
	   (defalias 'spam-enter-ham-BBDB 'ignore)
	   nil))

    (defun spam-enter-ham-BBDB (addresses &optional remove)
      "Enter an address into the BBDB; implies ham (non-spam) sender"
      (dolist (from addresses)
	(when (stringp from)
	  (let* ((parsed-address (gnus-extract-address-components from))
		 (name (or (nth 0 parsed-address) "Ham Sender"))
		 (remove-function (if remove
				      'bbdb-delete-record-internal
				    'ignore))
		 (net-address (nth 1 parsed-address))
		 (record (and net-address
			      (bbdb-search-simple nil net-address))))
	    (when net-address
	      (gnus-message 5 "%s address %s %s BBDB"
			    (if remove "Deleting" "Adding")
			    from
			    (if remove "from" "to"))
	      (if record
		  (funcall remove-function record)
		(bbdb-create-internal name nil net-address nil nil
				      "ham sender added by spam.el")))))))

    (defun spam-BBDB-register-routine (articles &optional unregister)
      (let (addresses)
	(dolist (article articles)
	  (when (stringp (spam-fetch-field-from-fast article))
	    (push (spam-fetch-field-from-fast article) addresses)))
	;; now do the register/unregister action
	(spam-enter-ham-BBDB addresses unregister)))

    (defun spam-BBDB-unregister-routine (articles)
      (spam-BBDB-register-routine articles t))

    (defun spam-check-BBDB ()
      "Mail from people in the BBDB is classified as ham or non-spam"
      (let ((who (nnmail-fetch-field "from"))
	    (spam-split-group (if spam-split-symbolic-return
				  'spam
				spam-split-group)))
	(when who
	  (setq who (nth 1 (gnus-extract-address-components who)))
	  (if (bbdb-search-simple nil who)
	      t
	    (if spam-use-BBDB-exclusive
		spam-split-group
	      nil)))))))
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;;;; ifile

;;; check the ifile backend; return nil if the mail was NOT classified
;;; as spam

(defun spam-get-ifile-database-parameter ()
  "Get the command-line parameter for ifile's database from
  spam-ifile-database-path."
  (if spam-ifile-database-path
      (format "--db-file=%s" spam-ifile-database-path)
    nil))

(defun spam-check-ifile ()
  "Check the ifile backend for the classification of this message."
  (let ((article-buffer-name (buffer-name))
	(spam-split-group (if spam-split-symbolic-return
			      'spam
			    spam-split-group))
	category return)
    (with-temp-buffer
      (let ((temp-buffer-name (buffer-name))
	    (db-param (spam-get-ifile-database-parameter)))
	(save-excursion
	  (set-buffer article-buffer-name)
	  (apply 'call-process-region
		 (point-min) (point-max) spam-ifile-path
		 nil temp-buffer-name nil "-c"
		 (if db-param `(,db-param "-q") `("-q"))))
	;; check the return now (we're back in the temp buffer)
	(goto-char (point-min))
	(if (not (eobp))
	    (setq category (buffer-substring (point) (spam-point-at-eol))))
	(when (not (zerop (length category))) ; we need a category here
	  (if spam-ifile-all-categories
	      (setq return category)
	    ;; else, if spam-ifile-all-categories is not set...
	    (when (string-equal spam-ifile-spam-category category)
	      (setq return spam-split-group)))))) ; note return is nil otherwise
    return))

(defun spam-ifile-register-with-ifile (articles category &optional unregister)
  "Register an article, given as a string, with a category.
Uses `gnus-newsgroup-name' if category is nil (for ham registration)."
  (let ((category (or category gnus-newsgroup-name))
	(add-or-delete-option (if unregister "-d" "-i"))
	(db (spam-get-ifile-database-parameter))
	parameters)
    (with-temp-buffer
      (dolist (article articles)
	(let ((article-string (spam-get-article-as-string article)))
	  (when (stringp article-string)
	    (insert article-string))))
      (apply 'call-process-region
	     (point-min) (point-max) spam-ifile-path
	     nil nil nil
	     add-or-delete-option category
	     (if db `(,db "-h") `("-h"))))))

(defun spam-ifile-register-spam-routine (articles &optional unregister)
  (spam-ifile-register-with-ifile articles spam-ifile-spam-category unregister))

(defun spam-ifile-unregister-spam-routine (articles)
  (spam-ifile-register-spam-routine articles t))

(defun spam-ifile-register-ham-routine (articles &optional unregister)
  (spam-ifile-register-with-ifile articles spam-ifile-ham-category unregister))

(defun spam-ifile-unregister-ham-routine (articles)
  (spam-ifile-register-ham-routine articles t))


;;;; spam-stat

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(eval-when-compile
  (autoload 'spam-stat-buffer-change-to-non-spam "spam-stat")
  (autoload 'spam-stat-buffer-change-to-spam "spam-stat")
  (autoload 'spam-stat-buffer-is-non-spam "spam-stat")
  (autoload 'spam-stat-buffer-is-spam "spam-stat")
  (autoload 'spam-stat-load "spam-stat")
  (autoload 'spam-stat-save "spam-stat")
  (autoload 'spam-stat-split-fancy "spam-stat"))

(eval-and-compile
  (when (condition-case nil
	    (let ((spam-stat-install-hooks nil))
	      (require 'spam-stat))
	  (file-error
	   (defalias 'spam-stat-register-ham-routine 'ignore)
	   (defalias 'spam-stat-register-spam-routine 'ignore)
	   nil))

    (defun spam-check-stat ()
      "Check the spam-stat backend for the classification of this message"
      (let ((spam-split-group (if spam-split-symbolic-return
				  'spam
				spam-split-group))
	    (spam-stat-split-fancy-spam-group spam-split-group) ; override
	    (spam-stat-buffer (buffer-name)) ; stat the current buffer
	    category return)
	(spam-stat-split-fancy)))

    (defun spam-stat-register-spam-routine (articles &optional unregister)
      (dolist (article articles)
	(let ((article-string (spam-get-article-as-string article)))
	  (with-temp-buffer
	    (insert article-string)
	    (if unregister
		(spam-stat-buffer-change-to-non-spam)
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	      (spam-stat-buffer-is-spam))))))

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    (defun spam-stat-unregister-spam-routine (articles)
      (spam-stat-register-spam-routine articles t))
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    (defun spam-stat-register-ham-routine (articles &optional unregister)
      (dolist (article articles)
	(let ((article-string (spam-get-article-as-string article)))
	  (with-temp-buffer
	    (insert article-string)
	    (if unregister
		(spam-stat-buffer-change-to-spam)
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	      (spam-stat-buffer-is-non-spam))))))

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    (defun spam-stat-unregister-ham-routine (articles)
      (spam-stat-register-ham-routine articles t))

    (defun spam-maybe-spam-stat-load ()
      (when spam-use-stat (spam-stat-load)))

    (defun spam-maybe-spam-stat-save ()
      (when spam-use-stat (spam-stat-save)))))
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;;;; Blacklists and whitelists.

(defvar spam-whitelist-cache nil)
(defvar spam-blacklist-cache nil)

(defun spam-kill-whole-line ()
  (beginning-of-line)
  (let ((kill-whole-line t))
    (kill-line)))

;;; address can be a list, too
(defun spam-enter-whitelist (address &optional remove)
  "Enter ADDRESS (list or single) into the whitelist.
With a non-nil REMOVE, remove them."
  (interactive "sAddress: ")
  (spam-enter-list address spam-whitelist remove)
  (setq spam-whitelist-cache nil))

;;; address can be a list, too
(defun spam-enter-blacklist (address &optional remove)
  "Enter ADDRESS (list or single) into the blacklist.
With a non-nil REMOVE, remove them."
  (interactive "sAddress: ")
  (spam-enter-list address spam-blacklist remove)
  (setq spam-blacklist-cache nil))

(defun spam-enter-list (addresses file &optional remove)
  "Enter ADDRESSES into the given FILE.
Either the whitelist or the blacklist files can be used.  With
REMOVE not nil, remove the ADDRESSES."
  (if (stringp addresses)
      (spam-enter-list (list addresses) file remove)
    ;; else, we have a list of addresses here
    (unless (file-exists-p (file-name-directory file))
      (make-directory (file-name-directory file) t))
    (save-excursion
      (set-buffer
       (find-file-noselect file))
      (dolist (a addresses)
	(when (stringp a)
	  (goto-char (point-min))
	  (if (re-search-forward (regexp-quote a) nil t)
	      ;; found the address
	      (when remove
		(spam-kill-whole-line))
	    ;; else, the address was not found
	    (unless remove
	      (goto-char (point-max))
	      (unless (bobp)
		(insert "\n"))
	      (insert a "\n")))))
      (save-buffer))))

;;; returns t if the sender is in the whitelist, nil or
;;; spam-split-group otherwise
(defun spam-check-whitelist ()
  ;; FIXME!  Should it detect when file timestamps change?
  (let ((spam-split-group (if spam-split-symbolic-return
			      'spam
			    spam-split-group)))
    (unless spam-whitelist-cache
      (setq spam-whitelist-cache (spam-parse-list spam-whitelist)))
    (if (spam-from-listed-p spam-whitelist-cache)
	t
      (if spam-use-whitelist-exclusive
	  spam-split-group
	nil))))

(defun spam-check-blacklist ()
  ;; FIXME!  Should it detect when file timestamps change?
  (let ((spam-split-group (if spam-split-symbolic-return
			      'spam
			    spam-split-group)))
    (unless spam-blacklist-cache
      (setq spam-blacklist-cache (spam-parse-list spam-blacklist)))
    (and (spam-from-listed-p spam-blacklist-cache) spam-split-group)))

(defun spam-parse-list (file)
  (when (file-readable-p file)
    (let (contents address)
      (with-temp-buffer
	(insert-file-contents file)
	(while (not (eobp))
	  (setq address (buffer-substring (point) (spam-point-at-eol)))
	  (forward-line 1)
	  ;; insert the e-mail address if detected, otherwise the raw data
	  (unless (zerop (length address))
	    (let ((pure-address (nth 1 (gnus-extract-address-components address))))
	      (push (or pure-address address) contents)))))
      (nreverse contents))))

(defun spam-from-listed-p (cache)
  (let ((from (nnmail-fetch-field "from"))
	found)
    (while cache
      (let ((address (pop cache)))
	(unless (zerop (length address)) ; 0 for a nil address too
	  (setq address (regexp-quote address))
	  ;; fix regexp-quote's treatment of user-intended regexes
	  (while (string-match "\\\\\\*" address)
	    (setq address (replace-match ".*" t t address))))
	(when (and address (string-match address from))
	  (setq found t
		cache nil))))
    found))

(defun spam-filelist-register-routine (articles blacklist &optional unregister)
  (let ((de-symbol (if blacklist 'spam-use-whitelist 'spam-use-blacklist))
	(declassification (if blacklist 'ham 'spam))
	(enter-function
	 (if blacklist 'spam-enter-blacklist 'spam-enter-whitelist))
	(remove-function
	 (if blacklist 'spam-enter-whitelist 'spam-enter-blacklist))
	from addresses unregister-list)
    (dolist (article articles)
      (let ((from (spam-fetch-field-from-fast article))
	    (id (spam-fetch-field-message-id-fast article))
	    sender-ignored)
	(when (stringp from)
	  (dolist (ignore-regex spam-blacklist-ignored-regexes)
	    (when (and (not sender-ignored)
		       (stringp ignore-regex)
		       (string-match ignore-regex from))
	      (setq sender-ignored t)))
	  ;; remember the messages we need to unregister, unless remove is set
	  (when (and
		 (null unregister)
		 (spam-log-unregistration-needed-p
		  id 'process declassification de-symbol))
	    (push from unregister-list))
	  (unless sender-ignored
	    (push from addresses)))))

    (if unregister
	(funcall enter-function addresses t) ; unregister all these addresses
      ;; else, register normally and unregister what we need to
      (funcall remove-function unregister-list t)
      (dolist (article unregister-list)
	(spam-log-undo-registration
	 (spam-fetch-field-message-id-fast article)
	 'process
	 declassification
	 de-symbol))
      (funcall enter-function addresses nil))))

(defun spam-blacklist-unregister-routine (articles)
  (spam-blacklist-register-routine articles t))

(defun spam-blacklist-register-routine (articles &optional unregister)
  (spam-filelist-register-routine articles t unregister))

(defun spam-whitelist-unregister-routine (articles)
  (spam-whitelist-register-routine articles t))

(defun spam-whitelist-register-routine (articles &optional unregister)
  (spam-filelist-register-routine articles nil unregister))


;;;; Spam-report glue
(defun spam-report-gmane-register-routine (articles)
  (when articles
    (apply 'spam-report-gmane articles)))


;;;; Bogofilter
(defun spam-check-bogofilter-headers (&optional score)
  (let ((header (nnmail-fetch-field spam-bogofilter-header))
	(spam-split-group (if spam-split-symbolic-return
			      'spam
			    spam-split-group)))
    (when header			; return nil when no header
      (if score				; scoring mode
	  (if (string-match "spamicity=\\([0-9.]+\\)" header)
	      (match-string 1 header)
	    "0")
	;; spam detection mode
	(when (string-match spam-bogofilter-bogosity-positive-spam-header
			    header)
	  spam-split-group)))))

;; return something sensible if the score can't be determined
(defun spam-bogofilter-score ()
  "Get the Bogofilter spamicity score"
  (interactive)
  (save-window-excursion
    (gnus-summary-show-article t)
    (set-buffer gnus-article-buffer)
    (let ((score (or (spam-check-bogofilter-headers t)
		     (spam-check-bogofilter t))))
      (message "Spamicity score %s" score)
      (or score "0"))
    (gnus-summary-show-article)))

(defun spam-check-bogofilter (&optional score)
  "Check the Bogofilter backend for the classification of this message"
  (let ((article-buffer-name (buffer-name))
	(db spam-bogofilter-database-directory)
	return)
    (with-temp-buffer
      (let ((temp-buffer-name (buffer-name)))
	(save-excursion
	  (set-buffer article-buffer-name)
	  (apply 'call-process-region
		 (point-min) (point-max)
		 spam-bogofilter-path
		 nil temp-buffer-name nil
		 (if db `("-d" ,db "-v") `("-v"))))
	(setq return (spam-check-bogofilter-headers score))))
    return))

(defun spam-bogofilter-register-with-bogofilter (articles
						 spam
						 &optional unregister)
  "Register an article, given as a string, as spam or non-spam."
  (dolist (article articles)
    (let ((article-string (spam-get-article-as-string article))
	  (db spam-bogofilter-database-directory)
	  (switch (if unregister
		      (if spam
			  spam-bogofilter-spam-strong-switch
			spam-bogofilter-ham-strong-switch)
		    (if spam
			spam-bogofilter-spam-switch
		      spam-bogofilter-ham-switch))))
      (when (stringp article-string)
	(with-temp-buffer
	  (insert article-string)

	  (apply 'call-process-region
		 (point-min) (point-max)
		 spam-bogofilter-path
		 nil nil nil switch
		 (if db `("-d" ,db "-v") `("-v"))))))))

(defun spam-bogofilter-register-spam-routine (articles &optional unregister)
  (spam-bogofilter-register-with-bogofilter articles t unregister))

(defun spam-bogofilter-unregister-spam-routine (articles)
  (spam-bogofilter-register-spam-routine articles t))

(defun spam-bogofilter-register-ham-routine (articles &optional unregister)
  (spam-bogofilter-register-with-bogofilter articles nil unregister))

(defun spam-bogofilter-unregister-ham-routine (articles)
  (spam-bogofilter-register-ham-routine articles t))



;;;; spamoracle
(defun spam-check-spamoracle ()
  "Run spamoracle on an article to determine whether it's spam."
  (let ((article-buffer-name (buffer-name))
	(spam-split-group (if spam-split-symbolic-return
			      'spam
			    spam-split-group)))
    (with-temp-buffer
      (let ((temp-buffer-name (buffer-name)))
	(save-excursion
	  (set-buffer article-buffer-name)
	  (let ((status
		 (apply 'call-process-region
			(point-min) (point-max)
			spam-spamoracle-binary
			nil temp-buffer-name nil
			(if spam-spamoracle-database
			    `("-f" ,spam-spamoracle-database "mark")
			  '("mark")))))
	    (if (eq 0 status)
		(progn
		  (set-buffer temp-buffer-name)
		  (goto-char (point-min))
		  (when (re-search-forward "^X-Spam: yes;" nil t)
		    spam-split-group))
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	      (error "Error running spamoracle: %s" status))))))))
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(defun spam-spamoracle-learn (articles article-is-spam-p &optional unregister)
  "Run spamoracle in training mode."
  (with-temp-buffer
    (let ((temp-buffer-name (buffer-name)))
      (save-excursion
	(goto-char (point-min))
	(dolist (article articles)
	  (insert (spam-get-article-as-string article)))
	(let* ((arg (if (spam-xor unregister article-is-spam-p)
			"-spam"
		      "-good"))
	       (status
		(apply 'call-process-region
		       (point-min) (point-max)
		       spam-spamoracle-binary
		       nil temp-buffer-name nil
		       (if spam-spamoracle-database
			   `("-f" ,spam-spamoracle-database
			     "add" ,arg)
			 `("add" ,arg)))))
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	  (unless (eq 0 status)
	    (error "Error running spamoracle: %s" status)))))))
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(defun spam-spamoracle-learn-ham (articles &optional unregister)
  (spam-spamoracle-learn articles nil unregister))

(defun spam-spamoracle-unlearn-ham (articles &optional unregister)
  (spam-spamoracle-learn-ham articles t))

(defun spam-spamoracle-learn-spam (articles &optional unregister)
  (spam-spamoracle-learn articles t unregister))

(defun spam-spamoracle-unlearn-spam (articles &optional unregister)
  (spam-spamoracle-learn-spam articles t))


;;;; Hooks

;;;###autoload
(defun spam-initialize ()
  "Install the spam.el hooks and do other initialization"
  (interactive)
  (setq spam-install-hooks t)
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  ;; TODO: How do we redo this every time the `spam' face is customized?
  (push '((eq mark gnus-spam-mark) . spam)
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	gnus-summary-highlight)
  ;; Add hooks for loading and saving the spam stats
  (add-hook 'gnus-save-newsrc-hook 'spam-maybe-spam-stat-save)
  (add-hook 'gnus-get-top-new-news-hook 'spam-maybe-spam-stat-load)
  (add-hook 'gnus-startup-hook 'spam-maybe-spam-stat-load)
  (add-hook 'gnus-summary-prepare-exit-hook 'spam-summary-prepare-exit)
  (add-hook 'gnus-summary-prepare-hook 'spam-summary-prepare)
  (add-hook 'gnus-get-new-news-hook 'spam-setup-widening)
  (add-hook 'gnus-summary-prepare-hook 'spam-find-spam))

(defun spam-unload-hook ()
  "Uninstall the spam.el hooks"
  (interactive)
  (remove-hook 'gnus-save-newsrc-hook 'spam-maybe-spam-stat-save)
  (remove-hook 'gnus-get-top-new-news-hook 'spam-maybe-spam-stat-load)
  (remove-hook 'gnus-startup-hook 'spam-maybe-spam-stat-load)
  (remove-hook 'gnus-summary-prepare-exit-hook 'spam-summary-prepare-exit)
  (remove-hook 'gnus-summary-prepare-hook 'spam-summary-prepare)
  (remove-hook 'gnus-get-new-news-hook 'spam-setup-widening)
  (remove-hook 'gnus-summary-prepare-hook 'spam-find-spam))

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(add-hook 'spam-unload-hook 'spam-unload-hook)

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(when spam-install-hooks
  (spam-initialize))

(provide 'spam)

;;; arch-tag: 07e6e0ca-ab0a-4412-b445-1f6c72a4f27f
;;; spam.el ends here