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   1 ;;; spam.el --- Identifying spam
   2 ;; Copyright (C) 2002, 2003, 2004 Free Software Foundation, Inc.
   3
   4 ;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
   5 ;; Keywords: network
   6
   7 ;; This file is part of GNU Emacs.
   8
   9 ;; GNU Emacs is free software; you can redistribute it and/or modify
  10 ;; it under the terms of the GNU General Public License as published by
  11 ;; the Free Software Foundation; either version 2, or (at your option)
  12 ;; any later version.
  13
  14 ;; GNU Emacs is distributed in the hope that it will be useful,
  15 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 ;; GNU General Public License for more details.
  18
  19 ;; You should have received a copy of the GNU General Public License
  20 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  21 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  22 ;; Boston, MA 02111-1307, USA.
  23
  24 ;;; Commentary:
  25
  26 ;;; This module addresses a few aspects of spam control under Gnus.  Page
  27 ;;; breaks are used for grouping declarations and documentation relating to
  28 ;;; each particular aspect.
  29
  30 ;;; The integration with Gnus is not yet complete.  See various `FIXME'
  31 ;;; comments, below, for supplementary explanations or discussions.
  32
  33 ;;; Several TODO items are marked as such
  34
  35 ;; TODO: spam scores, detection of spam in newsgroups, cross-server splitting,
  36 ;; remote processing, training through files
  37
  38 ;;; Code:
  39
  40 (require 'path-util)
  41
  42 (eval-when-compile (require 'cl))
  43
  44 (require 'gnus-sum)
  45
  46 (require 'gnus-uu)                      ; because of key prefix issues
  47 ;;; for the definitions of group content classification and spam processors
  48 (require 'gnus)
  49 (require 'message)              ;for the message-fetch-field functions
  50
  51 ;; for nnimap-split-download-body-default
  52 (eval-when-compile (require 'nnimap))
  53
  54 ;; autoload query-dig
  55 (eval-and-compile
  56   (autoload 'query-dig "dig"))
  57
  58 ;; autoload spam-report
  59 (eval-and-compile
  60   (autoload 'spam-report-gmane "spam-report"))
  61
  62 ;; autoload gnus-registry
  63 (eval-and-compile
  64   (autoload 'gnus-registry-group-count "gnus-registry")
  65   (autoload 'gnus-registry-add-group "gnus-registry")
  66   (autoload 'gnus-registry-store-extra-entry "gnus-registry")
  67   (autoload 'gnus-registry-fetch-extra "gnus-registry"))
  68
  69 ;; autoload query-dns
  70 (eval-and-compile
  71   (autoload 'query-dns "dns"))
  72
  73 ;;; Main parameters.
  74
  75 (defgroup spam nil
  76   "Spam configuration.")
  77
  78 (defcustom spam-directory "~/News/spam/"
  79   "Directory for spam whitelists and blacklists."
  80   :type 'directory
  81   :group 'spam)
  82
  83 (defcustom spam-move-spam-nonspam-groups-only t
  84   "Whether spam should be moved in non-spam groups only.
  85 When t, only ham and unclassified groups will have their spam moved
  86 to the spam-process-destination.  When nil, spam will also be moved from
  87 spam groups."
  88   :type 'boolean
  89   :group 'spam)
  90
  91 (defcustom spam-process-ham-in-nonham-groups nil
  92   "Whether ham should be processed in non-ham groups."
  93   :type 'boolean
  94   :group 'spam)
  95
  96 (defcustom spam-log-to-registry nil
  97   "Whether spam/ham processing should be logged in the registry."
  98   :type 'boolean
  99   :group 'spam)
 100
 101 (defcustom spam-split-symbolic-return nil
 102   "Whether `spam-split' should work with symbols or group names."
 103   :type 'boolean
 104   :group 'spam)
 105
 106 (defcustom spam-split-symbolic-return-positive nil
 107   "Whether `spam-split' should ALWAYS work with symbols or group names.
 108 Do not set this if you use `spam-split' in a fancy split
 109   method."
 110   :type 'boolean
 111   :group 'spam)
 112
 113 (defcustom spam-process-ham-in-spam-groups nil
 114   "Whether ham should be processed in spam groups."
 115   :type 'boolean
 116   :group 'spam)
 117
 118 (defcustom spam-mark-only-unseen-as-spam t
 119   "Whether only unseen articles should be marked as spam in spam groups.
 120 When nil, all unread articles in a spam group are marked as
 121 spam.  Set this if you want to leave an article unread in a spam group
 122 without losing it to the automatic spam-marking process."
 123   :type 'boolean
 124   :group 'spam)
 125
 126 (defcustom spam-mark-ham-unread-before-move-from-spam-group nil
 127   "Whether ham should be marked unread before it's moved.
 128 The article is moved out of a spam group according to ham-process-destination.
 129 This variable is an official entry in the international Longest Variable Name
 130 Competition."
 131   :type 'boolean
 132   :group 'spam)
 133
 134 (defcustom spam-disable-spam-split-during-ham-respool nil
 135   "Whether `spam-split' should be ignored while resplitting ham in a process
 136 destination.  This is useful to prevent ham from ending up in the same spam
 137 group after the resplit.  Don't set this to t if you have spam-split as the
 138 last rule in your split configuration."
 139   :type 'boolean
 140   :group 'spam)
 141
 142 (defcustom spam-autodetect-recheck-messages nil
 143   "Should spam.el recheck all meessages when autodetecting?
 144 Normally this is nil, so only unseen messages will be checked."
 145   :type 'boolean
 146   :group 'spam)
 147
 148 (defcustom spam-whitelist (expand-file-name "whitelist" spam-directory)
 149   "The location of the whitelist.
 150 The file format is one regular expression per line.
 151 The regular expression is matched against the address."
 152   :type 'file
 153   :group 'spam)
 154
 155 (defcustom spam-blacklist (expand-file-name "blacklist" spam-directory)
 156   "The location of the blacklist.
 157 The file format is one regular expression per line.
 158 The regular expression is matched against the address."
 159   :type 'file
 160   :group 'spam)
 161
 162 (defcustom spam-use-dig t
 163   "Whether `query-dig' should be used instead of `query-dns'."
 164   :type 'boolean
 165   :group 'spam)
 166
 167 (defcustom spam-use-blacklist nil
 168   "Whether the blacklist should be used by `spam-split'."
 169   :type 'boolean
 170   :group 'spam)
 171
 172 (defcustom spam-blacklist-ignored-regexes nil
 173   "Regular expressions that the blacklist should ignore."
 174   :type '(repeat (regexp :tag "Regular expression to ignore when blacklisting"))
 175   :group 'spam)
 176
 177 (defcustom spam-use-whitelist nil
 178   "Whether the whitelist should be used by `spam-split'."
 179   :type 'boolean
 180   :group 'spam)
 181
 182 (defcustom spam-use-whitelist-exclusive nil
 183   "Whether whitelist-exclusive should be used by `spam-split'.
 184 Exclusive whitelisting means that all messages from senders not in the whitelist
 185 are considered spam."
 186   :type 'boolean
 187   :group 'spam)
 188
 189 (defcustom spam-use-blackholes nil
 190   "Whether blackholes should be used by `spam-split'."
 191   :type 'boolean
 192   :group 'spam)
 193
 194 (defcustom spam-use-hashcash nil
 195   "Whether hashcash payments should be detected by `spam-split'."
 196   :type 'boolean
 197   :group 'spam)
 198
 199 (defcustom spam-use-regex-headers nil
 200   "Whether a header regular expression match should be used by `spam-split'.
 201 Also see the variables `spam-regex-headers-spam' and `spam-regex-headers-ham'."
 202   :type 'boolean
 203   :group 'spam)
 204
 205 (defcustom spam-use-regex-body nil
 206   "Whether a body regular expression match should be used by `spam-split'.
 207 Also see the variables `spam-regex-body-spam' and `spam-regex-body-ham'."
 208   :type 'boolean
 209   :group 'spam)
 210
 211 (defcustom spam-use-bogofilter-headers nil
 212   "Whether bogofilter headers should be used by `spam-split'.
 213 Enable this if you pre-process messages with Bogofilter BEFORE Gnus sees them."
 214   :type 'boolean
 215   :group 'spam)
 216
 217 (defcustom spam-use-bogofilter nil
 218   "Whether bogofilter should be invoked by `spam-split'.
 219 Enable this if you want Gnus to invoke Bogofilter on new messages."
 220   :type 'boolean
 221   :group 'spam)
 222
 223 (defcustom spam-use-BBDB nil
 224   "Whether BBDB should be used by `spam-split'."
 225   :type 'boolean
 226   :group 'spam)
 227
 228 (defcustom spam-use-BBDB-exclusive nil
 229   "Whether BBDB-exclusive should be used by `spam-split'.
 230 Exclusive BBDB means that all messages from senders not in the BBDB are
 231 considered spam."
 232   :type 'boolean
 233   :group 'spam)
 234
 235 (defcustom spam-use-ifile nil
 236   "Whether ifile should be used by `spam-split'."
 237   :type 'boolean
 238   :group 'spam)
 239
 240 (defcustom spam-use-stat nil
 241   "Whether `spam-stat' should be used by `spam-split'."
 242   :type 'boolean
 243   :group 'spam)
 244
 245 (defcustom spam-use-spamoracle nil
 246   "Whether spamoracle should be used by `spam-split'."
 247   :type 'boolean
 248   :group 'spam)
 249
 250 (defcustom spam-install-hooks (or
 251                                spam-use-dig
 252                                spam-use-blacklist
 253                                spam-use-whitelist
 254                                spam-use-whitelist-exclusive
 255                                spam-use-blackholes
 256                                spam-use-hashcash
 257                                spam-use-regex-headers
 258                                spam-use-regex-body
 259                                spam-use-bogofilter-headers
 260                                spam-use-bogofilter
 261                                spam-use-BBDB
 262                                spam-use-BBDB-exclusive
 263                                spam-use-ifile
 264                                spam-use-stat
 265                                spam-use-spamoracle)
 266   "Whether the spam hooks should be installed.
 267 Default to t if one of the spam-use-* variables is set."
 268   :group 'spam
 269   :type 'boolean)
 270
 271 (defcustom spam-split-group "spam"
 272   "Group name where incoming spam should be put by `spam-split'."
 273   :type 'string
 274   :group 'spam)
 275
 276 ;;; TODO: deprecate this variable, it's confusing since it's a list of strings,
 277 ;;; not regular expressions
 278 (defcustom spam-junk-mailgroups (cons
 279                                  spam-split-group
 280                                  '("mail.junk" "poste.pourriel"))
 281   "Mailgroups with spam contents.
 282 All unmarked article in such group receive the spam mark on group entry."
 283   :type '(repeat (string :tag "Group"))
 284   :group 'spam)
 285
 286 (defcustom spam-blackhole-servers '("bl.spamcop.net" "relays.ordb.org"
 287                                     "dev.null.dk" "relays.visi.com")
 288   "List of blackhole servers."
 289   :type '(repeat (string :tag "Server"))
 290   :group 'spam)
 291
 292 (defcustom spam-blackhole-good-server-regex nil
 293   "String matching IP addresses that should not be checked in the blackholes."
 294   :type '(radio (const nil)
 295                 (regexp :format "%t: %v\n" :size 0))
 296   :group 'spam)
 297
 298 (defcustom spam-face 'gnus-splash-face
 299   "Face for spam-marked articles."
 300   :type 'face
 301   :group 'spam)
 302
 303 (defcustom spam-regex-headers-spam '("^X-Spam-Flag: YES")
 304   "Regular expression for positive header spam matches."
 305   :type '(repeat (regexp :tag "Regular expression to match spam header"))
 306   :group 'spam)
 307
 308 (defcustom spam-regex-headers-ham '("^X-Spam-Flag: NO")
 309   "Regular expression for positive header ham matches."
 310   :type '(repeat (regexp :tag "Regular expression to match ham header"))
 311   :group 'spam)
 312
 313 (defcustom spam-regex-body-spam '()
 314   "Regular expression for positive body spam matches."
 315   :type '(repeat (regexp :tag "Regular expression to match spam body"))
 316   :group 'spam)
 317
 318 (defcustom spam-regex-body-ham '()
 319   "Regular expression for positive body ham matches."
 320   :type '(repeat (regexp :tag "Regular expression to match ham body"))
 321   :group 'spam)
 322
 323 (defgroup spam-ifile nil
 324   "Spam ifile configuration."
 325   :group 'spam)
 326
 327 (defcustom spam-ifile-path (exec-installed-p "ifile")
 328   "File path of the ifile executable program."
 329   :type '(choice (file :tag "Location of ifile")
 330                  (const :tag "ifile is not installed"))
 331   :group 'spam-ifile)
 332
 333 (defcustom spam-ifile-database-path nil
 334   "File path of the ifile database."
 335   :type '(choice (file :tag "Location of the ifile database")
 336                  (const :tag "Use the default"))
 337   :group 'spam-ifile)
 338
 339 (defcustom spam-ifile-spam-category "spam"
 340   "Name of the spam ifile category."
 341   :type 'string
 342   :group 'spam-ifile)
 343
 344 (defcustom spam-ifile-ham-category nil
 345   "Name of the ham ifile category.
 346 If nil, the current group name will be used."
 347   :type '(choice (string :tag "Use a fixed category")
 348                  (const :tag "Use the current group name"))
 349   :group 'spam-ifile)
 350
 351 (defcustom spam-ifile-all-categories nil
 352   "Whether the ifile check will return all categories, or just spam.
 353 Set this to t if you want to use the `spam-split' invocation of ifile as
 354 your main source of newsgroup names."
 355   :type 'boolean
 356   :group 'spam-ifile)
 357
 358 (defgroup spam-bogofilter nil
 359   "Spam bogofilter configuration."
 360   :group 'spam)
 361
 362 (defcustom spam-bogofilter-path (exec-installed-p "bogofilter")
 363   "File path of the Bogofilter executable program."
 364   :type '(choice (file :tag "Location of bogofilter")
 365                  (const :tag "Bogofilter is not installed"))
 366   :group 'spam-bogofilter)
 367
 368 (defcustom spam-bogofilter-header "X-Bogosity"
 369   "The header that Bogofilter inserts in messages."
 370   :type 'string
 371   :group 'spam-bogofilter)
 372
 373 (defcustom spam-bogofilter-spam-switch "-s"
 374   "The switch that Bogofilter uses to register spam messages."
 375   :type 'string
 376   :group 'spam-bogofilter)
 377
 378 (defcustom spam-bogofilter-ham-switch "-n"
 379   "The switch that Bogofilter uses to register ham messages."
 380   :type 'string
 381   :group 'spam-bogofilter)
 382
 383 (defcustom spam-bogofilter-spam-strong-switch "-S"
 384   "The switch that Bogofilter uses to unregister ham messages."
 385   :type 'string
 386   :group 'spam-bogofilter)
 387
 388 (defcustom spam-bogofilter-ham-strong-switch "-N"
 389   "The switch that Bogofilter uses to unregister spam messages."
 390   :type 'string
 391   :group 'spam-bogofilter)
 392
 393 (defcustom spam-bogofilter-bogosity-positive-spam-header "^\\(Yes\\|Spam\\)"
 394   "The regex on `spam-bogofilter-header' for positive spam identification."
 395   :type 'regexp
 396   :group 'spam-bogofilter)
 397
 398 (defcustom spam-bogofilter-database-directory nil
 399   "Directory path of the Bogofilter databases."
 400   :type '(choice (directory
 401                   :tag "Location of the Bogofilter database directory")
 402                  (const :tag "Use the default"))
 403   :group 'spam-bogofilter)
 404
 405 (defgroup spam-spamoracle nil
 406   "Spam spamoracle configuration."
 407   :group 'spam)
 408
 409 (defcustom spam-spamoracle-database nil
 410   "Location of spamoracle database file. When nil, use the default
 411 spamoracle database."
 412   :type '(choice (directory :tag "Location of spamoracle database file.")
 413                  (const :tag "Use the default"))
 414   :group 'spam-spamoracle)
 415
 416 (defcustom spam-spamoracle-binary (executable-find "spamoracle")
 417   "Location of the spamoracle binary."
 418   :type '(choice (directory :tag "Location of the spamoracle binary")
 419                  (const :tag "Use the default"))
 420   :group 'spam-spamoracle)
 421
 422 ;;; Key bindings for spam control.
 423
 424 (gnus-define-keys gnus-summary-mode-map
 425   "St" spam-bogofilter-score
 426   "Sx" gnus-summary-mark-as-spam
 427   "Mst" spam-bogofilter-score
 428   "Msx" gnus-summary-mark-as-spam
 429   "\M-d" gnus-summary-mark-as-spam)
 430
 431 (defvar spam-old-ham-articles nil
 432   "List of old ham articles, generated when a group is entered.")
 433
 434 (defvar spam-old-spam-articles nil
 435   "List of old spam articles, generated when a group is entered.")
 436
 437 (defvar spam-split-disabled nil
 438   "If non-nil, `spam-split' is disabled, and always returns nil.")
 439
 440 (defvar spam-split-last-successful-check nil
 441   "`spam-split' will set this to nil or a spam-use-XYZ check if it
 442   finds ham or spam.")
 443
 444 ;; convenience functions
 445 (defun spam-xor (a b)
 446   "Logical exclusive `or'."
 447   (and (or a b) (not (and a b))))
 448
 449 (defun spam-group-ham-mark-p (group mark &optional spam)
 450   (when (stringp group)
 451     (let* ((marks (spam-group-ham-marks group spam))
 452            (marks (if (symbolp mark)
 453                       marks
 454                     (mapcar 'symbol-value marks))))
 455       (memq mark marks))))
 456
 457 (defun spam-group-spam-mark-p (group mark)
 458   (spam-group-ham-mark-p group mark t))
 459
 460 (defun spam-group-ham-marks (group &optional spam)
 461   (when (stringp group)
 462     (let* ((marks (if spam
 463                       (gnus-parameter-spam-marks group)
 464                     (gnus-parameter-ham-marks group)))
 465            (marks (car marks))
 466            (marks (if (listp (car marks)) (car marks) marks)))
 467       marks)))
 468
 469 (defun spam-group-spam-marks (group)
 470   (spam-group-ham-marks group t))
 471
 472 (defun spam-group-spam-contents-p (group)
 473   (if (stringp group)
 474       (or (member group spam-junk-mailgroups)
 475           (memq 'gnus-group-spam-classification-spam
 476                 (gnus-parameter-spam-contents group)))
 477     nil))
 478
 479 (defun spam-group-ham-contents-p (group)
 480   (if (stringp group)
 481       (memq 'gnus-group-spam-classification-ham
 482             (gnus-parameter-spam-contents group))
 483     nil))
 484
 485 (defvar spam-list-of-processors
 486   '((gnus-group-spam-exit-processor-report-gmane spam spam-use-gmane)
 487     (gnus-group-spam-exit-processor-bogofilter   spam spam-use-bogofilter)
 488     (gnus-group-spam-exit-processor-blacklist    spam spam-use-blacklist)
 489     (gnus-group-spam-exit-processor-ifile        spam spam-use-ifile)
 490     (gnus-group-spam-exit-processor-stat         spam spam-use-stat)
 491     (gnus-group-spam-exit-processor-spamoracle   spam spam-use-spamoracle)
 492     (gnus-group-ham-exit-processor-ifile         ham spam-use-ifile)
 493     (gnus-group-ham-exit-processor-bogofilter    ham spam-use-bogofilter)
 494     (gnus-group-ham-exit-processor-stat          ham spam-use-stat)
 495     (gnus-group-ham-exit-processor-whitelist     ham spam-use-whitelist)
 496     (gnus-group-ham-exit-processor-BBDB          ham spam-use-BBDB)
 497     (gnus-group-ham-exit-processor-copy          ham spam-use-ham-copy)
 498     (gnus-group-ham-exit-processor-spamoracle    ham spam-use-spamoracle))
 499   "The spam-list-of-processors list contains pairs associating a
 500 ham/spam exit processor variable with a classification and a
 501 spam-use-* variable.")
 502
 503 (defun spam-group-processor-p (group processor)
 504   (if (and (stringp group)
 505            (symbolp processor))
 506       (or (member processor (nth 0 (gnus-parameter-spam-process group)))
 507           (spam-group-processor-multiple-p
 508            group
 509            (cdr-safe (assoc processor spam-list-of-processors))))
 510     nil))
 511
 512 (defun spam-group-processor-multiple-p (group processor-info)
 513   (let* ((classification (nth 0 processor-info))
 514          (check (nth 1 processor-info))
 515          (parameters (nth 0 (gnus-parameter-spam-process group)))
 516          found)
 517     (dolist (parameter parameters)
 518       (when (and (null found)
 519                  (listp parameter)
 520                  (eq classification (nth 0 parameter))
 521                  (eq check (nth 1 parameter)))
 522         (setq found t)))
 523     found))
 524
 525 (defun spam-group-spam-processor-report-gmane-p (group)
 526   (spam-group-processor-p group 'gnus-group-spam-exit-processor-report-gmane))
 527
 528 (defun spam-group-spam-processor-bogofilter-p (group)
 529   (spam-group-processor-p group 'gnus-group-spam-exit-processor-bogofilter))
 530
 531 (defun spam-group-spam-processor-blacklist-p (group)
 532   (spam-group-processor-p group 'gnus-group-spam-exit-processor-blacklist))
 533
 534 (defun spam-group-spam-processor-ifile-p (group)
 535   (spam-group-processor-p group 'gnus-group-spam-exit-processor-ifile))
 536
 537 (defun spam-group-ham-processor-ifile-p (group)
 538   (spam-group-processor-p group 'gnus-group-ham-exit-processor-ifile))
 539
 540 (defun spam-group-spam-processor-spamoracle-p (group)
 541   (spam-group-processor-p group 'gnus-group-spam-exit-processor-spamoracle))
 542
 543 (defun spam-group-ham-processor-bogofilter-p (group)
 544   (spam-group-processor-p group 'gnus-group-ham-exit-processor-bogofilter))
 545
 546 (defun spam-group-spam-processor-stat-p (group)
 547   (spam-group-processor-p group 'gnus-group-spam-exit-processor-stat))
 548
 549 (defun spam-group-ham-processor-stat-p (group)
 550   (spam-group-processor-p group 'gnus-group-ham-exit-processor-stat))
 551
 552 (defun spam-group-ham-processor-whitelist-p (group)
 553   (spam-group-processor-p group 'gnus-group-ham-exit-processor-whitelist))
 554
 555 (defun spam-group-ham-processor-BBDB-p (group)
 556   (spam-group-processor-p group 'gnus-group-ham-exit-processor-BBDB))
 557
 558 (defun spam-group-ham-processor-copy-p (group)
 559   (spam-group-processor-p group 'gnus-group-ham-exit-processor-copy))
 560
 561 (defun spam-group-ham-processor-spamoracle-p (group)
 562   (spam-group-processor-p group 'gnus-group-ham-exit-processor-spamoracle))
 563
 564 ;;; Summary entry and exit processing.
 565
 566 (defun spam-summary-prepare ()
 567   (setq spam-old-ham-articles
 568         (spam-list-articles gnus-newsgroup-articles 'ham))
 569   (setq spam-old-spam-articles
 570         (spam-list-articles gnus-newsgroup-articles 'spam))
 571   (spam-mark-junk-as-spam-routine))
 572
 573 ;; The spam processors are invoked for any group, spam or ham or neither
 574 (defun spam-summary-prepare-exit ()
 575   (unless gnus-group-is-exiting-without-update-p
 576     (gnus-message 6 "Exiting summary buffer and applying spam rules")
 577
 578     ;; first of all, unregister any articles that are no longer ham or spam
 579     ;; we have to iterate over the processors, or else we'll be too slow
 580     (dolist (classification '(spam ham))
 581       (let* ((old-articles (if (eq classification 'spam)
 582                                spam-old-spam-articles
 583                              spam-old-ham-articles))
 584              (new-articles (spam-list-articles
 585                             gnus-newsgroup-articles
 586                             classification))
 587              (changed-articles (gnus-set-difference old-articles new-articles)))
 588         ;; now that we have the changed articles, we go through the processors
 589         (dolist (processor-param spam-list-of-processors)
 590           (let ((processor (nth 0 processor-param))
 591                 (processor-classification (nth 1 processor-param))
 592                 (check (nth 2 processor-param))
 593                 unregister-list)
 594             (dolist (article changed-articles)
 595               (let ((id (spam-fetch-field-message-id-fast article)))
 596                 (when (spam-log-unregistration-needed-p
 597                        id 'process classification check)
 598                   (push article unregister-list))))
 599             ;; call spam-register-routine with specific articles to unregister,
 600             ;; when there are articles to unregister and the check is enabled
 601             (when (and unregister-list (symbol-value check))
 602               (spam-register-routine classification check t unregister-list))))))
 603
 604     ;; find all the spam processors applicable to this group
 605     (dolist (processor-param spam-list-of-processors)
 606       (let ((processor (nth 0 processor-param))
 607             (classification (nth 1 processor-param))
 608             (check (nth 2 processor-param)))
 609         (when (and (eq 'spam classification)
 610                    (spam-group-processor-p gnus-newsgroup-name processor))
 611           (spam-register-routine classification check))))
 612
 613     (if spam-move-spam-nonspam-groups-only
 614         (when (not (spam-group-spam-contents-p gnus-newsgroup-name))
 615           (spam-mark-spam-as-expired-and-move-routine
 616            (gnus-parameter-spam-process-destination gnus-newsgroup-name)))
 617       (gnus-message 5 "Marking spam as expired and moving it to %s"
 618                     gnus-newsgroup-name)
 619       (spam-mark-spam-as-expired-and-move-routine
 620        (gnus-parameter-spam-process-destination gnus-newsgroup-name)))
 621
 622     ;; now we redo spam-mark-spam-as-expired-and-move-routine to only
 623     ;; expire spam, in case the above did not expire them
 624     (gnus-message 5 "Marking spam as expired without moving it")
 625     (spam-mark-spam-as-expired-and-move-routine nil)
 626
 627     (when (or (spam-group-ham-contents-p gnus-newsgroup-name)
 628               (and (spam-group-spam-contents-p gnus-newsgroup-name)
 629                    spam-process-ham-in-spam-groups)
 630               spam-process-ham-in-nonham-groups)
 631       ;; find all the ham processors applicable to this group
 632       (dolist (processor-param spam-list-of-processors)
 633         (let ((processor (nth 0 processor-param))
 634               (classification (nth 1 processor-param))
 635               (check (nth 2 processor-param)))
 636           (when (and (eq 'ham classification)
 637                      (spam-group-processor-p gnus-newsgroup-name processor))
 638             (spam-register-routine classification check)))))
 639
 640     (when (spam-group-ham-processor-copy-p gnus-newsgroup-name)
 641       (gnus-message 5 "Copying ham")
 642       (spam-ham-copy-routine
 643        (gnus-parameter-ham-process-destination gnus-newsgroup-name)))
 644
 645     ;; now move all ham articles out of spam groups
 646     (when (spam-group-spam-contents-p gnus-newsgroup-name)
 647       (gnus-message 5 "Moving ham messages from spam group")
 648       (spam-ham-move-routine
 649        (gnus-parameter-ham-process-destination gnus-newsgroup-name))))
 650
 651   (setq spam-old-ham-articles nil)
 652   (setq spam-old-spam-articles nil))
 653
 654 (defun spam-mark-junk-as-spam-routine ()
 655   ;; check the global list of group names spam-junk-mailgroups and the
 656   ;; group parameters
 657   (when (spam-group-spam-contents-p gnus-newsgroup-name)
 658     (gnus-message 5 "Marking %s articles as spam"
 659                   (if spam-mark-only-unseen-as-spam
 660                       "unseen"
 661                     "unread"))
 662     (let ((articles (if spam-mark-only-unseen-as-spam
 663                         gnus-newsgroup-unseen
 664                       gnus-newsgroup-unreads)))
 665       (dolist (article articles)
 666         (gnus-summary-mark-article article gnus-spam-mark)))))
 667
 668 (defun spam-mark-spam-as-expired-and-move-routine (&rest groups)
 669   (if (and (car-safe groups) (listp (car-safe groups)))
 670       (apply 'spam-mark-spam-as-expired-and-move-routine (car groups))
 671     (gnus-summary-kill-process-mark)
 672     (let ((articles gnus-newsgroup-articles)
 673           (backend-supports-deletions
 674            (gnus-check-backend-function
 675             'request-move-article gnus-newsgroup-name))
 676           article tomove deletep)
 677       (dolist (article articles)
 678         (when (eq (gnus-summary-article-mark article) gnus-spam-mark)
 679           (gnus-summary-mark-article article gnus-expirable-mark)
 680           (push article tomove)))
 681
 682       ;; now do the actual copies
 683       (dolist (group groups)
 684         (when (and tomove
 685                    (stringp group))
 686           (dolist (article tomove)
 687             (gnus-summary-set-process-mark article))
 688           (when tomove
 689             (if (or (not backend-supports-deletions)
 690                     (> (length groups) 1))
 691                 (progn
 692                   (gnus-summary-copy-article nil group)
 693                   (setq deletep t))
 694               (gnus-summary-move-article nil group)))))
 695
 696       ;; now delete the articles, if there was a copy done, and the
 697       ;; backend allows it
 698       (when (and deletep backend-supports-deletions)
 699         (dolist (article tomove)
 700           (gnus-summary-set-process-mark article))
 701         (when tomove
 702           (let ((gnus-novice-user nil)) ; don't ask me if I'm sure
 703             (gnus-summary-delete-article nil))))
 704
 705       (gnus-summary-yank-process-mark))))
 706
 707 (defun spam-ham-copy-or-move-routine (copy groups)
 708   (gnus-summary-kill-process-mark)
 709   (let ((todo (spam-list-articles gnus-newsgroup-articles 'ham))
 710         (backend-supports-deletions
 711          (gnus-check-backend-function
 712           'request-move-article gnus-newsgroup-name))
 713         (respool-method (gnus-find-method-for-group gnus-newsgroup-name))
 714         article mark todo deletep respool)
 715
 716     (when (member 'respool groups)
 717       (setq respool t)                  ; boolean for later
 718       (setq groups '("fake"))) ; when respooling, groups are dynamic so fake it
 719
 720     ;; now do the actual move
 721     (dolist (group groups)
 722       (when (and todo (stringp group))
 723         (dolist (article todo)
 724           (when spam-mark-ham-unread-before-move-from-spam-group
 725             (gnus-summary-mark-article article gnus-unread-mark))
 726           (gnus-summary-set-process-mark article))
 727
 728         (if respool                        ; respooling is with a "fake" group
 729             (let ((spam-split-disabled
 730                    (or spam-split-disabled
 731                        spam-disable-spam-split-during-ham-respool)))
 732               (gnus-summary-respool-article nil respool-method))
 733           (if (or (not backend-supports-deletions) ; else, we are not respooling
 734                   (> (length groups) 1))
 735               (progn                ; if copying, copy and set deletep
 736                 (gnus-summary-copy-article nil group)
 737                 (setq deletep t))
 738             (gnus-summary-move-article nil group))))) ; else move articles
 739
 740     ;; now delete the articles, unless a) copy is t, and there was a copy done
 741     ;;                                 b) a move was done to a single group
 742     ;;                                 c) backend-supports-deletions is nil
 743     (unless copy
 744       (when (and deletep backend-supports-deletions)
 745         (dolist (article todo)
 746           (gnus-summary-set-process-mark article))
 747         (when todo
 748           (let ((gnus-novice-user nil)) ; don't ask me if I'm sure
 749             (gnus-summary-delete-article nil))))))
 750
 751   (gnus-summary-yank-process-mark))
 752
 753 (defun spam-ham-copy-routine (&rest groups)
 754   (if (and (car-safe groups) (listp (car-safe groups)))
 755       (apply 'spam-ham-copy-routine (car groups))
 756     (spam-ham-copy-or-move-routine t groups)))
 757
 758 (defun spam-ham-move-routine (&rest groups)
 759   (if (and (car-safe groups) (listp (car-safe groups)))
 760       (apply 'spam-ham-move-routine (car groups))
 761     (spam-ham-copy-or-move-routine nil groups)))
 762
 763 (defun spam-get-article-as-string (article)
 764   (let ((article-buffer (spam-get-article-as-buffer article))
 765         article-string)
 766     (when article-buffer
 767       (save-window-excursion
 768         (set-buffer article-buffer)
 769         (setq article-string (buffer-string))))
 770     article-string))
 771
 772 (defun spam-get-article-as-buffer (article)
 773   (let ((article-buffer))
 774     (when (numberp article)
 775       (save-window-excursion
 776         (gnus-summary-goto-subject article)
 777         (gnus-summary-show-article t)
 778         (setq article-buffer (get-buffer gnus-article-buffer))))
 779     article-buffer))
 780
 781 ;; disabled for now
 782 ;; (defun spam-get-article-as-filename (article)
 783 ;;   (let ((article-filename))
 784 ;;     (when (numberp article)
 785 ;;       (nnml-possibly-change-directory
 786 ;;        (gnus-group-real-name gnus-newsgroup-name))
 787 ;;       (setq article-filename (expand-file-name
 788 ;;                              (int-to-string article) nnml-current-directory)))
 789 ;;     (if (file-exists-p article-filename)
 790 ;;      article-filename
 791 ;;       nil)))
 792
 793 (defun spam-fetch-field-from-fast (article)
 794   "Fetch the `from' field quickly, using the internal gnus-data-list function"
 795   (if (and (numberp article)
 796            (assoc article (gnus-data-list nil)))
 797       (mail-header-from
 798        (gnus-data-header (assoc article (gnus-data-list nil))))
 799     nil))
 800
 801 (defun spam-fetch-field-subject-fast (article)
 802   "Fetch the `subject' field quickly, using the internal
 803   gnus-data-list function"
 804   (if (and (numberp article)
 805            (assoc article (gnus-data-list nil)))
 806       (mail-header-subject
 807        (gnus-data-header (assoc article (gnus-data-list nil))))
 808     nil))
 809
 810 (defun spam-fetch-field-message-id-fast (article)
 811   "Fetch the `Message-ID' field quickly, using the internal
 812   gnus-data-list function"
 813   (if (and (numberp article)
 814            (assoc article (gnus-data-list nil)))
 815       (mail-header-message-id
 816        (gnus-data-header (assoc article (gnus-data-list nil))))
 817     nil))
 818
 819 \f
 820 ;;;; Spam determination.
 821
 822 (defvar spam-list-of-checks
 823   '((spam-use-blacklist          . spam-check-blacklist)
 824     (spam-use-regex-headers      . spam-check-regex-headers)
 825     (spam-use-regex-body         . spam-check-regex-body)
 826     (spam-use-whitelist          . spam-check-whitelist)
 827     (spam-use-BBDB               . spam-check-BBDB)
 828     (spam-use-ifile              . spam-check-ifile)
 829     (spam-use-spamoracle         . spam-check-spamoracle)
 830     (spam-use-stat               . spam-check-stat)
 831     (spam-use-blackholes         . spam-check-blackholes)
 832     (spam-use-hashcash           . spam-check-hashcash)
 833     (spam-use-bogofilter-headers . spam-check-bogofilter-headers)
 834     (spam-use-bogofilter         . spam-check-bogofilter))
 835   "The spam-list-of-checks list contains pairs associating a
 836 parameter variable with a spam checking function.  If the
 837 parameter variable is true, then the checking function is called,
 838 and its value decides what happens.  Each individual check may
 839 return nil, t, or a mailgroup name.  The value nil means that the
 840 check does not yield a decision, and so, that further checks are
 841 needed.  The value t means that the message is definitely not
 842 spam, and that further spam checks should be inhibited.
 843 Otherwise, a mailgroup name or the symbol 'spam (depending on
 844 spam-split-symbolic-return) is returned where the mail should go,
 845 and further checks are also inhibited.  The usual mailgroup name
 846 is the value of `spam-split-group', meaning that the message is
 847 definitely a spam.")
 848
 849 (defvar spam-list-of-statistical-checks
 850   '(spam-use-ifile
 851     spam-use-regex-body
 852     spam-use-stat
 853     spam-use-bogofilter
 854     spam-use-spamoracle)
 855   "The spam-list-of-statistical-checks list contains all the mail
 856 splitters that need to have the full message body available.")
 857
 858 ;;;TODO: modify to invoke self with each check if invoked without specifics
 859 (defun spam-split (&rest specific-checks)
 860   "Split this message into the `spam' group if it is spam.
 861 This function can be used as an entry in the variable `nnmail-split-fancy',
 862 for example like this: (: spam-split).  It can take checks as
 863 parameters.  A string as a parameter will set the
 864 spam-split-group to that string.
 865
 866 See the Info node `(gnus)Fancy Mail Splitting' for more details."
 867   (interactive)
 868   (setq spam-split-last-successful-check nil)
 869   (unless spam-split-disabled
 870     (let ((spam-split-group-choice spam-split-group))
 871       (dolist (check specific-checks)
 872         (when (stringp check)
 873           (setq spam-split-group-choice check)
 874           (setq specific-checks (delq check specific-checks))))
 875
 876       (let ((spam-split-group spam-split-group-choice))
 877         (save-excursion
 878           (save-restriction
 879             (dolist (check spam-list-of-statistical-checks)
 880               (when (and (symbolp check) (symbol-value check))
 881                 (widen)
 882                 (gnus-message 8 "spam-split: widening the buffer (%s requires it)"
 883                               (symbol-name check))
 884                 (return)))
 885             ;;   (progn (widen) (debug (buffer-string)))
 886             (let ((list-of-checks spam-list-of-checks)
 887                   decision)
 888               (while (and list-of-checks (not decision))
 889                 (let ((pair (pop list-of-checks)))
 890                   (when (and (symbol-value (car pair))
 891                              (or (null specific-checks)
 892                                  (memq (car pair) specific-checks)))
 893                     (gnus-message 5 "spam-split: calling the %s function"
 894                                   (symbol-name (cdr pair)))
 895                     (setq decision (funcall (cdr pair)))
 896                     ;; if we got a decision at all, save the current check
 897                     (when decision
 898                       (setq spam-split-last-successful-check (car pair)))
 899
 900                     (when (eq decision 'spam)
 901                       (if spam-split-symbolic-return
 902                           (setq decision spam-split-group)
 903                         (gnus-error
 904                          5
 905                          (format "spam-split got %s but %s is nil"
 906                                  (symbol-name decision)
 907                                  (symbol-name spam-split-symbolic-return))))))))
 908               (if (eq decision t)
 909                   (if spam-split-symbolic-return-positive 'ham nil)
 910                 decision))))))))
 911
 912 (defun spam-find-spam ()
 913   "This function will detect spam in the current newsgroup using spam-split."
 914   (interactive)
 915
 916   (let* ((group gnus-newsgroup-name)
 917          (autodetect (gnus-parameter-spam-autodetect group))
 918          (methods (gnus-parameter-spam-autodetect-methods group))
 919          (first-method (nth 0 methods)))
 920   (when (and autodetect
 921              (not (equal first-method 'none)))
 922     (mapcar
 923      (lambda (article)
 924        (let ((id (spam-fetch-field-message-id-fast article))
 925              (subject (spam-fetch-field-subject-fast article))
 926              (sender (spam-fetch-field-from-fast article)))
 927          (unless (and spam-log-to-registry
 928                       (spam-log-registered-p id 'incoming))
 929            (let* ((spam-split-symbolic-return t)
 930                   (spam-split-symbolic-return-positive t)
 931                   (split-return
 932                    (with-temp-buffer
 933                      (gnus-request-article-this-buffer
 934                       article
 935                       group)
 936                      (if (or (null first-method)
 937                              (equal first-method 'default))
 938                          (spam-split)
 939                        (apply 'spam-split methods)))))
 940              (if (equal split-return 'spam)
 941                  (gnus-summary-mark-article article gnus-spam-mark))
 942
 943              (when (and split-return spam-log-to-registry)
 944                (when (zerop (gnus-registry-group-count id))
 945                  (gnus-registry-add-group
 946                   id group subject sender))
 947
 948                (spam-log-processing-to-registry
 949                 id
 950                 'incoming
 951                 split-return
 952                 spam-split-last-successful-check
 953                 group))))))
 954      (if spam-autodetect-recheck-messages
 955          gnus-newsgroup-articles
 956        gnus-newsgroup-unseen)))))
 957
 958 (defvar spam-registration-functions
 959   ;; first the ham register, second the spam register function
 960   ;; third the ham unregister, fourth the spam unregister function
 961   '((spam-use-blacklist  nil
 962                          spam-blacklist-register-routine
 963                          nil
 964                          spam-blacklist-unregister-routine)
 965     (spam-use-whitelist  spam-whitelist-register-routine
 966                          nil
 967                          spam-whitelist-unregister-routine
 968                          nil)
 969     (spam-use-BBDB       spam-BBDB-register-routine
 970                          nil
 971                          spam-BBDB-unregister-routine
 972                          nil)
 973     (spam-use-ifile      spam-ifile-register-ham-routine
 974                          spam-ifile-register-spam-routine
 975                          spam-ifile-unregister-ham-routine
 976                          spam-ifile-unregister-spam-routine)
 977     (spam-use-spamoracle spam-spamoracle-learn-ham
 978                          spam-spamoracle-learn-spam
 979                          spam-spamoracle-unlearn-ham
 980                          spam-spamoracle-unlearn-spam)
 981     (spam-use-stat       spam-stat-register-ham-routine
 982                          spam-stat-register-spam-routine
 983                          spam-stat-unregister-ham-routine
 984                          spam-stat-unregister-spam-routine)
 985     ;; note that spam-use-gmane is not a legitimate check
 986     (spam-use-gmane      nil
 987                          spam-report-gmane-register-routine
 988                          ;; does Gmane support unregistration?
 989                          nil
 990                          nil)
 991     (spam-use-bogofilter spam-bogofilter-register-ham-routine
 992                          spam-bogofilter-register-spam-routine
 993                          spam-bogofilter-unregister-ham-routine
 994                          spam-bogofilter-unregister-spam-routine))
 995   "The spam-registration-functions list contains pairs
 996 associating a parameter variable with the ham and spam
 997 registration functions, and the ham and spam unregistration
 998 functions")
 999
1000 (defun spam-classification-valid-p (classification)
1001   (or  (eq classification 'spam)
1002        (eq classification 'ham)))
1003
1004 (defun spam-process-type-valid-p (process-type)
1005   (or  (eq process-type 'incoming)
1006        (eq process-type 'process)))
1007
1008 (defun spam-registration-check-valid-p (check)
1009   (assoc check spam-registration-functions))
1010
1011 (defun spam-unregistration-check-valid-p (check)
1012   (assoc check spam-registration-functions))
1013
1014 (defun spam-registration-function (classification check)
1015   (let ((flist (cdr-safe (assoc check spam-registration-functions))))
1016     (if (eq classification 'spam)
1017         (nth 1 flist)
1018       (nth 0 flist))))
1019
1020 (defun spam-unregistration-function (classification check)
1021   (let ((flist (cdr-safe (assoc check spam-registration-functions))))
1022     (if (eq classification 'spam)
1023         (nth 3 flist)
1024       (nth 2 flist))))
1025
1026 (defun spam-list-articles (articles classification)
1027   (let ((mark-check (if (eq classification 'spam)
1028                         'spam-group-spam-mark-p
1029                       'spam-group-ham-mark-p))
1030         list mark-cache-yes mark-cache-no)
1031     (dolist (article articles)
1032       (let ((mark (gnus-summary-article-mark article)))
1033         (unless (memq mark mark-cache-no)
1034           (if (memq mark mark-cache-yes)
1035               (push article list)
1036             ;; else, we have to actually check the mark
1037             (if (funcall mark-check
1038                          gnus-newsgroup-name
1039                          mark)
1040                 (progn
1041                   (push article list)
1042                   (push mark mark-cache-yes))
1043               (push mark mark-cache-no))))))
1044     list))
1045
1046 (defun spam-register-routine (classification
1047                               check
1048                               &optional unregister
1049                               specific-articles)
1050   (when (and (spam-classification-valid-p classification)
1051              (spam-registration-check-valid-p check))
1052     (let* ((register-function
1053             (spam-registration-function classification check))
1054            (unregister-function
1055             (spam-unregistration-function classification check))
1056            (run-function (if unregister
1057                              unregister-function
1058                            register-function))
1059            (log-function (if unregister
1060                              'spam-log-undo-registration
1061                            'spam-log-processing-to-registry))
1062            article articles)
1063
1064       (when run-function
1065         ;; make list of articles, using specific-articles if given
1066         (setq articles (or specific-articles
1067                            (spam-list-articles
1068                             gnus-newsgroup-articles
1069                             classification)))
1070         ;; process them
1071         (gnus-message 5 "%s %d %s articles with classification %s, check %s"
1072                       (if unregister "Unregistering" "Registering")
1073                       (length articles)
1074                       (if specific-articles "specific" "")
1075                       (symbol-name classification)
1076                       (symbol-name check))
1077         (funcall run-function articles)
1078         ;; now log all the registrations (or undo them, depending on unregister)
1079         (dolist (article articles)
1080           (funcall log-function
1081                    (spam-fetch-field-message-id-fast article)
1082                    'process
1083                    classification
1084                    check
1085                    gnus-newsgroup-name))))))
1086
1087 ;;; log a ham- or spam-processor invocation to the registry
1088 (defun spam-log-processing-to-registry (id type classification check group)
1089   (when spam-log-to-registry
1090     (if (and (stringp id)
1091              (stringp group)
1092              (spam-process-type-valid-p type)
1093              (spam-classification-valid-p classification)
1094              (spam-registration-check-valid-p check))
1095         (let ((cell-list (cdr-safe (gnus-registry-fetch-extra id type)))
1096               (cell (list classification check group)))
1097           (push cell cell-list)
1098           (gnus-registry-store-extra-entry
1099            id
1100            type
1101            cell-list))
1102
1103       (gnus-message 5 (format "%s called with bad ID, type, classification, check, or group"
1104                               "spam-log-processing-to-registry")))))
1105
1106 ;;; check if a ham- or spam-processor registration has been done
1107 (defun spam-log-registered-p (id type)
1108   (when spam-log-to-registry
1109     (if (and (stringp id)
1110              (spam-process-type-valid-p type))
1111         (cdr-safe (gnus-registry-fetch-extra id type))
1112       (progn
1113         (gnus-message 5 (format "%s called with bad ID, type, classification, or check"
1114                                 "spam-log-registered-p"))
1115         nil))))
1116
1117 ;;; check if a ham- or spam-processor registration needs to be undone
1118 (defun spam-log-unregistration-needed-p (id type classification check)
1119   (when spam-log-to-registry
1120     (if (and (stringp id)
1121              (spam-process-type-valid-p type)
1122              (spam-classification-valid-p classification)
1123              (spam-registration-check-valid-p check))
1124         (let ((cell-list (cdr-safe (gnus-registry-fetch-extra id type)))
1125               found)
1126           (dolist (cell cell-list)
1127             (unless found
1128               (when (and (eq classification (nth 0 cell))
1129                          (eq check (nth 1 cell)))
1130                 (setq found t))))
1131           found)
1132       (progn
1133         (gnus-message 5 (format "%s called with bad ID, type, classification, or check"
1134                                 "spam-log-unregistration-needed-p"))
1135         nil))))
1136
1137
1138 ;;; undo a ham- or spam-processor registration (the group is not used)
1139 (defun spam-log-undo-registration (id type classification check &optional group)
1140   (when (and spam-log-to-registry
1141              (spam-log-unregistration-needed-p id type classification check))
1142     (if (and (stringp id)
1143              (spam-process-type-valid-p type)
1144              (spam-classification-valid-p classification)
1145              (spam-registration-check-valid-p check))
1146         (let ((cell-list (cdr-safe (gnus-registry-fetch-extra id type)))
1147               new-cell-list found)
1148           (dolist (cell cell-list)
1149             (unless (and (eq classification (nth 0 cell))
1150                          (eq check (nth 1 cell)))
1151               (push cell new-cell-list)))
1152           (gnus-registry-store-extra-entry
1153            id
1154            type
1155            new-cell-list))
1156       (progn
1157         (gnus-message 5 (format "%s called with bad ID, type, check, or group"
1158                                 "spam-log-undo-registration"))
1159         nil))))
1160
1161 ;;; set up IMAP widening if it's necessary
1162 (defun spam-setup-widening ()
1163   (dolist (check spam-list-of-statistical-checks)
1164     (when (symbol-value check)
1165       (setq nnimap-split-download-body-default t))))
1166
1167 \f
1168 ;;;; Regex body
1169
1170 (defun spam-check-regex-body ()
1171   (let ((spam-regex-headers-ham spam-regex-body-ham)
1172         (spam-regex-headers-spam spam-regex-body-spam))
1173     (spam-check-regex-headers t)))
1174
1175 \f
1176 ;;;; Regex headers
1177
1178 (defun spam-check-regex-headers (&optional body)
1179   (let ((type (if body "body" "header"))
1180         (spam-split-group (if spam-split-symbolic-return
1181                               'spam
1182                             spam-split-group))
1183         ret found)
1184     (dolist (h-regex spam-regex-headers-ham)
1185       (unless found
1186         (goto-char (point-min))
1187         (when (re-search-forward h-regex nil t)
1188           (message "Ham regex %s search positive." type)
1189           (setq found t))))
1190     (dolist (s-regex spam-regex-headers-spam)
1191       (unless found
1192         (goto-char (point-min))
1193         (when (re-search-forward s-regex nil t)
1194           (message "Spam regex %s search positive." type)
1195           (setq found t)
1196           (setq ret spam-split-group))))
1197     ret))
1198
1199 \f
1200 ;;;; Blackholes.
1201
1202 (defun spam-reverse-ip-string (ip)
1203   (when (stringp ip)
1204     (mapconcat 'identity
1205                (nreverse (split-string ip "\\."))
1206                ".")))
1207
1208 (defun spam-check-blackholes ()
1209   "Check the Received headers for blackholed relays."
1210   (let ((headers (nnmail-fetch-field "received"))
1211         (spam-split-group (if spam-split-symbolic-return
1212                               'spam
1213                             spam-split-group))
1214         ips matches)
1215     (when headers
1216       (with-temp-buffer
1217         (insert headers)
1218         (goto-char (point-min))
1219         (gnus-message 5 "Checking headers for relay addresses")
1220         (while (re-search-forward
1221                 "\\([0-9]+\\.[0-9]+\\.[0-9]+\\.[0-9]+\\)" nil t)
1222           (gnus-message 9 "Blackhole search found host IP %s." (match-string 1))
1223           (push (spam-reverse-ip-string (match-string 1))
1224                 ips)))
1225       (dolist (server spam-blackhole-servers)
1226         (dolist (ip ips)
1227           (unless (and spam-blackhole-good-server-regex
1228                        ;; match the good-server-regex against the reversed (again) IP string
1229                        (string-match
1230                         spam-blackhole-good-server-regex
1231                         (spam-reverse-ip-string ip)))
1232             (unless matches
1233               (let ((query-string (concat ip "." server)))
1234                 (if spam-use-dig
1235                     (let ((query-result (query-dig query-string)))
1236                       (when query-result
1237                         (gnus-message 5 "(DIG): positive blackhole check '%s'"
1238                                       query-result)
1239                         (push (list ip server query-result)
1240                               matches)))
1241                   ;; else, if not using dig.el
1242                   (when (query-dns query-string)
1243                     (gnus-message 5 "positive blackhole check")
1244                     (push (list ip server (query-dns query-string 'TXT))
1245                           matches)))))))))
1246     (when matches
1247       spam-split-group)))
1248 \f
1249 ;;;; Hashcash.
1250
1251 (condition-case nil
1252     (progn
1253       (require 'hashcash)
1254
1255       (defun spam-check-hashcash ()
1256         "Check the headers for hashcash payments."
1257         (mail-check-payment)))   ;mail-check-payment returns a boolean
1258
1259   (file-error (progn
1260                 (defalias 'mail-check-payment 'ignore)
1261                 (defalias 'spam-check-hashcash 'ignore))))
1262 \f
1263 ;;;; BBDB
1264
1265 ;;; original idea for spam-check-BBDB from Alexander Kotelnikov
1266 ;;; <sacha@giotto.sj.ru>
1267
1268 ;; all this is done inside a condition-case to trap errors
1269
1270 (condition-case nil
1271     (progn
1272       (require 'bbdb)
1273       (require 'bbdb-com)
1274
1275       (defun spam-enter-ham-BBDB (addresses &optional remove)
1276         "Enter an address into the BBDB; implies ham (non-spam) sender"
1277         (dolist (from addresses)
1278           (when (stringp from)
1279             (let* ((parsed-address (gnus-extract-address-components from))
1280                    (name (or (nth 0 parsed-address) "Ham Sender"))
1281                    (remove-function (if remove
1282                                         'bbdb-delete-record-internal
1283                                       'ignore))
1284                    (net-address (nth 1 parsed-address))
1285                    (record (and net-address
1286                                 (bbdb-search-simple nil net-address))))
1287               (when net-address
1288                 (gnus-message 5 "%s address %s %s BBDB"
1289                               (if remove "Deleting" "Adding")
1290                               from
1291                               (if remove "from" "to"))
1292                 (if record
1293                     (funcall remove-function record)
1294                   (bbdb-create-internal name nil net-address nil nil
1295                                         "ham sender added by spam.el")))))))
1296
1297       (defun spam-BBDB-register-routine (articles &optional unregister)
1298         (let (addresses)
1299           (dolist (article articles)
1300             (when (stringp (spam-fetch-field-from-fast article))
1301               (push (spam-fetch-field-from-fast article) addresses)))
1302           ;; now do the register/unregister action
1303           (spam-enter-ham-BBDB addresses unregister)))
1304
1305       (defun spam-BBDB-unregister-routine (articles)
1306         (spam-BBDB-register-routine articles t))
1307
1308       (defun spam-check-BBDB ()
1309         "Mail from people in the BBDB is classified as ham or non-spam"
1310         (let ((who (nnmail-fetch-field "from"))
1311               (spam-split-group (if spam-split-symbolic-return
1312                                     'spam
1313                                   spam-split-group)))
1314           (when who
1315             (setq who (nth 1 (gnus-extract-address-components who)))
1316             (if (bbdb-search-simple nil who)
1317                 t
1318               (if spam-use-BBDB-exclusive
1319                   spam-split-group
1320                 nil))))))
1321
1322   (file-error (progn
1323                 (defalias 'bbdb-search-simple 'ignore)
1324                 (defalias 'spam-check-BBDB 'ignore)
1325                 (defalias 'spam-BBDB-register-routine 'ignore)
1326                 (defalias 'spam-enter-ham-BBDB 'ignore)
1327                 (defalias 'bbdb-create-internal 'ignore)
1328                 (defalias 'bbdb-delete-record-internal 'ignore)
1329                 (defalias 'bbdb-records 'ignore))))
1330
1331 \f
1332 ;;;; ifile
1333
1334 ;;; check the ifile backend; return nil if the mail was NOT classified
1335 ;;; as spam
1336
1337 (defun spam-get-ifile-database-parameter ()
1338   "Get the command-line parameter for ifile's database from
1339   spam-ifile-database-path."
1340   (if spam-ifile-database-path
1341       (format "--db-file=%s" spam-ifile-database-path)
1342     nil))
1343
1344 (defun spam-check-ifile ()
1345   "Check the ifile backend for the classification of this message."
1346   (let ((article-buffer-name (buffer-name))
1347         (spam-split-group (if spam-split-symbolic-return
1348                               'spam
1349                             spam-split-group))
1350         category return)
1351     (with-temp-buffer
1352       (let ((temp-buffer-name (buffer-name))
1353             (db-param (spam-get-ifile-database-parameter)))
1354         (save-excursion
1355           (set-buffer article-buffer-name)
1356           (apply 'call-process-region
1357                  (point-min) (point-max) spam-ifile-path
1358                  nil temp-buffer-name nil "-c"
1359                  (if db-param `(,db-param "-q") `("-q"))))
1360         ;; check the return now (we're back in the temp buffer)
1361         (goto-char (point-min))
1362         (if (not (eobp))
1363             (setq category (buffer-substring (point) (point-at-eol))))
1364         (when (not (zerop (length category))) ; we need a category here
1365           (if spam-ifile-all-categories
1366               (setq return category)
1367             ;; else, if spam-ifile-all-categories is not set...
1368             (when (string-equal spam-ifile-spam-category category)
1369               (setq return spam-split-group)))))) ; note return is nil otherwise
1370     return))
1371
1372 (defun spam-ifile-register-with-ifile (articles category &optional unregister)
1373   "Register an article, given as a string, with a category.
1374 Uses `gnus-newsgroup-name' if category is nil (for ham registration)."
1375   (let ((category (or category gnus-newsgroup-name))
1376         (add-or-delete-option (if unregister "-d" "-i"))
1377         (db (spam-get-ifile-database-parameter))
1378         parameters)
1379     (with-temp-buffer
1380       (dolist (article articles)
1381         (let ((article-string (spam-get-article-as-string article)))
1382           (when (stringp article-string)
1383             (insert article-string))))
1384       (apply 'call-process-region
1385              (point-min) (point-max) spam-ifile-path
1386              nil nil nil
1387              add-or-delete-option category
1388              (if db `(,db "-h") `("-h"))))))
1389
1390 (defun spam-ifile-register-spam-routine (articles &optional unregister)
1391   (spam-ifile-register-with-ifile articles spam-ifile-spam-category unregister))
1392
1393 (defun spam-ifile-unregister-spam-routine (articles)
1394   (spam-ifile-register-spam-routine articles t))
1395
1396 (defun spam-ifile-register-ham-routine (articles &optional unregister)
1397   (spam-ifile-register-with-ifile articles spam-ifile-ham-category unregister))
1398
1399 (defun spam-ifile-unregister-ham-routine (articles)
1400   (spam-ifile-register-ham-routine articles t))
1401
1402 \f
1403 ;;;; spam-stat
1404
1405 (condition-case nil
1406     (progn
1407       (let ((spam-stat-install-hooks nil))
1408         (require 'spam-stat))
1409
1410       (defun spam-check-stat ()
1411         "Check the spam-stat backend for the classification of this message"
1412         (let ((spam-split-group (if spam-split-symbolic-return
1413                                     'spam
1414                                   spam-split-group))
1415               (spam-stat-split-fancy-spam-group spam-split-group) ; override
1416               (spam-stat-buffer (buffer-name)) ; stat the current buffer
1417               category return)
1418           (spam-stat-split-fancy)))
1419
1420       (defun spam-stat-register-spam-routine (articles &optional unregister)
1421         (dolist (article articles)
1422           (let ((article-string (spam-get-article-as-string article)))
1423             (with-temp-buffer
1424               (insert article-string)
1425               (if unregister
1426                   (spam-stat-buffer-change-to-non-spam)
1427               (spam-stat-buffer-is-spam))))))
1428
1429       (defun spam-stat-unregister-spam-routine (articles)
1430         (spam-stat-register-spam-routine articles t))
1431
1432       (defun spam-stat-register-ham-routine (articles &optional unregister)
1433         (dolist (article articles)
1434           (let ((article-string (spam-get-article-as-string article)))
1435             (with-temp-buffer
1436               (insert article-string)
1437               (if unregister
1438                   (spam-stat-buffer-change-to-spam)
1439               (spam-stat-buffer-is-non-spam))))))
1440
1441       (defun spam-stat-unregister-ham-routine (articles)
1442         (spam-stat-register-ham-routine articles t))
1443
1444       (defun spam-maybe-spam-stat-load ()
1445         (when spam-use-stat (spam-stat-load)))
1446
1447       (defun spam-maybe-spam-stat-save ()
1448         (when spam-use-stat (spam-stat-save))))
1449
1450   (file-error (progn
1451                 (defalias 'spam-stat-load 'ignore)
1452                 (defalias 'spam-stat-save 'ignore)
1453                 (defalias 'spam-maybe-spam-stat-load 'ignore)
1454                 (defalias 'spam-maybe-spam-stat-save 'ignore)
1455                 (defalias 'spam-stat-register-ham-routine 'ignore)
1456                 (defalias 'spam-stat-unregister-ham-routine 'ignore)
1457                 (defalias 'spam-stat-register-spam-routine 'ignore)
1458                 (defalias 'spam-stat-unregister-spam-routine 'ignore)
1459                 (defalias 'spam-stat-buffer-is-spam 'ignore)
1460                 (defalias 'spam-stat-buffer-change-to-spam 'ignore)
1461                 (defalias 'spam-stat-buffer-is-non-spam 'ignore)
1462                 (defalias 'spam-stat-buffer-change-to-non-spam 'ignore)
1463                 (defalias 'spam-stat-split-fancy 'ignore)
1464                 (defalias 'spam-check-stat 'ignore))))
1465
1466 \f
1467
1468 ;;;; Blacklists and whitelists.
1469
1470 (defvar spam-whitelist-cache nil)
1471 (defvar spam-blacklist-cache nil)
1472
1473 (defun spam-kill-whole-line ()
1474   (beginning-of-line)
1475   (let ((kill-whole-line t))
1476     (kill-line)))
1477
1478 ;;; address can be a list, too
1479 (defun spam-enter-whitelist (address &optional remove)
1480   "Enter ADDRESS (list or single) into the whitelist.
1481 With a non-nil REMOVE, remove them."
1482   (interactive "sAddress: ")
1483   (spam-enter-list address spam-whitelist remove)
1484   (setq spam-whitelist-cache nil))
1485
1486 ;;; address can be a list, too
1487 (defun spam-enter-blacklist (address &optional remove)
1488   "Enter ADDRESS (list or single) into the blacklist.
1489 With a non-nil REMOVE, remove them."
1490   (interactive "sAddress: ")
1491   (spam-enter-list address spam-blacklist remove)
1492   (setq spam-blacklist-cache nil))
1493
1494 (defun spam-enter-list (addresses file &optional remove)
1495   "Enter ADDRESSES into the given FILE.
1496 Either the whitelist or the blacklist files can be used.  With
1497 REMOVE not nil, remove the ADDRESSES."
1498   (if (stringp addresses)
1499       (spam-enter-list (list addresses) file remove)
1500     ;; else, we have a list of addresses here
1501     (unless (file-exists-p (file-name-directory file))
1502       (make-directory (file-name-directory file) t))
1503     (save-excursion
1504       (set-buffer
1505        (find-file-noselect file))
1506       (dolist (a addresses)
1507         (when (stringp a)
1508           (goto-char (point-min))
1509           (if (re-search-forward (regexp-quote a) nil t)
1510               ;; found the address
1511               (when remove
1512                 (spam-kill-whole-line))
1513             ;; else, the address was not found
1514             (unless remove
1515               (goto-char (point-max))
1516               (unless (bobp)
1517                 (insert "\n"))
1518               (insert a "\n")))))
1519       (save-buffer))))
1520
1521 ;;; returns t if the sender is in the whitelist, nil or
1522 ;;; spam-split-group otherwise
1523 (defun spam-check-whitelist ()
1524   ;; FIXME!  Should it detect when file timestamps change?
1525   (let ((spam-split-group (if spam-split-symbolic-return
1526                               'spam
1527                             spam-split-group)))
1528     (unless spam-whitelist-cache
1529       (setq spam-whitelist-cache (spam-parse-list spam-whitelist)))
1530     (if (spam-from-listed-p spam-whitelist-cache)
1531         t
1532       (if spam-use-whitelist-exclusive
1533           spam-split-group
1534         nil))))
1535
1536 (defun spam-check-blacklist ()
1537   ;; FIXME!  Should it detect when file timestamps change?
1538   (let ((spam-split-group (if spam-split-symbolic-return
1539                               'spam
1540                             spam-split-group)))
1541     (unless spam-blacklist-cache
1542       (setq spam-blacklist-cache (spam-parse-list spam-blacklist)))
1543     (and (spam-from-listed-p spam-blacklist-cache) spam-split-group)))
1544
1545 (defun spam-parse-list (file)
1546   (when (file-readable-p file)
1547     (let (contents address)
1548       (with-temp-buffer
1549         (insert-file-contents file)
1550         (while (not (eobp))
1551           (setq address (buffer-substring (point) (point-at-eol)))
1552           (forward-line 1)
1553           ;; insert the e-mail address if detected, otherwise the raw data
1554           (unless (zerop (length address))
1555             (let ((pure-address (nth 1 (gnus-extract-address-components address))))
1556               (push (or pure-address address) contents)))))
1557       (nreverse contents))))
1558
1559 (defun spam-from-listed-p (cache)
1560   (let ((from (nnmail-fetch-field "from"))
1561         found)
1562     (while cache
1563       (let ((address (pop cache)))
1564         (unless (zerop (length address)) ; 0 for a nil address too
1565           (setq address (regexp-quote address))
1566           ;; fix regexp-quote's treatment of user-intended regexes
1567           (while (string-match "\\\\\\*" address)
1568             (setq address (replace-match ".*" t t address))))
1569         (when (and address (string-match address from))
1570           (setq found t
1571                 cache nil))))
1572     found))
1573
1574 (defun spam-filelist-register-routine (articles blacklist &optional unregister)
1575   (let ((de-symbol (if blacklist 'spam-use-whitelist 'spam-use-blacklist))
1576         (declassification (if blacklist 'ham 'spam))
1577         (enter-function
1578          (if blacklist 'spam-enter-blacklist 'spam-enter-whitelist))
1579         (remove-function
1580          (if blacklist 'spam-enter-whitelist 'spam-enter-blacklist))
1581         from addresses unregister-list)
1582     (dolist (article articles)
1583       (let ((from (spam-fetch-field-from-fast article))
1584             (id (spam-fetch-field-message-id-fast article))
1585             sender-ignored)
1586         (when (stringp from)
1587           (dolist (ignore-regex spam-blacklist-ignored-regexes)
1588             (when (and (not sender-ignored)
1589                        (stringp ignore-regex)
1590                        (string-match ignore-regex from))
1591               (setq sender-ignored t)))
1592           ;; remember the messages we need to unregister, unless remove is set
1593           (when (and
1594                  (null unregister)
1595                  (spam-log-unregistration-needed-p
1596                   id 'process declassification de-symbol))
1597             (push from unregister-list))
1598           (unless sender-ignored
1599             (push from addresses)))))
1600
1601     (if unregister
1602         (funcall enter-function addresses t) ; unregister all these addresses
1603       ;; else, register normally and unregister what we need to
1604       (funcall remove-function unregister-list t)
1605       (dolist (article unregister-list)
1606         (spam-log-undo-registration
1607          (spam-fetch-field-message-id-fast article)
1608          'process
1609          declassification
1610          de-symbol))
1611       (funcall enter-function addresses nil))))
1612
1613 (defun spam-blacklist-unregister-routine (articles)
1614   (spam-blacklist-register-routine articles t))
1615
1616 (defun spam-blacklist-register-routine (articles &optional unregister)
1617   (spam-filelist-register-routine articles t unregister))
1618
1619 (defun spam-whitelist-unregister-routine (articles)
1620   (spam-whitelist-register-routine articles t))
1621
1622 (defun spam-whitelist-register-routine (articles &optional unregister)
1623   (spam-filelist-register-routine articles nil unregister))
1624
1625 \f
1626 ;;;; Spam-report glue
1627 (defun spam-report-gmane-register-routine (articles)
1628   (when articles
1629     (apply 'spam-report-gmane articles)))
1630
1631 \f
1632 ;;;; Bogofilter
1633 (defun spam-check-bogofilter-headers (&optional score)
1634   (let ((header (nnmail-fetch-field spam-bogofilter-header))
1635         (spam-split-group (if spam-split-symbolic-return
1636                               'spam
1637                             spam-split-group)))
1638     (when header                        ; return nil when no header
1639       (if score                         ; scoring mode
1640           (if (string-match "spamicity=\\([0-9.]+\\)" header)
1641               (match-string 1 header)
1642             "0")
1643         ;; spam detection mode
1644         (when (string-match spam-bogofilter-bogosity-positive-spam-header
1645                             header)
1646           spam-split-group)))))
1647
1648 ;; return something sensible if the score can't be determined
1649 (defun spam-bogofilter-score ()
1650   "Get the Bogofilter spamicity score"
1651   (interactive)
1652   (save-window-excursion
1653     (gnus-summary-show-article t)
1654     (set-buffer gnus-article-buffer)
1655     (let ((score (or (spam-check-bogofilter-headers t)
1656                      (spam-check-bogofilter t))))
1657       (message "Spamicity score %s" score)
1658       (or score "0"))
1659     (gnus-summary-show-article)))
1660
1661 (defun spam-check-bogofilter (&optional score)
1662   "Check the Bogofilter backend for the classification of this message"
1663   (let ((article-buffer-name (buffer-name))
1664         (db spam-bogofilter-database-directory)
1665         return)
1666     (with-temp-buffer
1667       (let ((temp-buffer-name (buffer-name)))
1668         (save-excursion
1669           (set-buffer article-buffer-name)
1670           (apply 'call-process-region
1671                  (point-min) (point-max)
1672                  spam-bogofilter-path
1673                  nil temp-buffer-name nil
1674                  (if db `("-d" ,db "-v") `("-v"))))
1675         (setq return (spam-check-bogofilter-headers score))))
1676     return))
1677
1678 (defun spam-bogofilter-register-with-bogofilter (articles
1679                                                  spam
1680                                                  &optional unregister)
1681   "Register an article, given as a string, as spam or non-spam."
1682   (dolist (article articles)
1683     (let ((article-string (spam-get-article-as-string article))
1684           (db spam-bogofilter-database-directory)
1685           (switch (if unregister
1686                       (if spam
1687                           spam-bogofilter-spam-strong-switch
1688                         spam-bogofilter-ham-strong-switch)
1689                     (if spam
1690                         spam-bogofilter-spam-switch
1691                       spam-bogofilter-ham-switch))))
1692       (when (stringp article-string)
1693         (with-temp-buffer
1694           (insert article-string)
1695
1696           (apply 'call-process-region
1697                  (point-min) (point-max)
1698                  spam-bogofilter-path
1699                  nil nil nil switch
1700                  (if db `("-d" ,db "-v") `("-v"))))))))
1701
1702 (defun spam-bogofilter-register-spam-routine (articles &optional unregister)
1703   (spam-bogofilter-register-with-bogofilter articles t unregister))
1704
1705 (defun spam-bogofilter-unregister-spam-routine (articles)
1706   (spam-bogofilter-register-spam-routine articles t))
1707
1708 (defun spam-bogofilter-register-ham-routine (articles &optional unregister)
1709   (spam-bogofilter-register-with-bogofilter articles nil unregister))
1710
1711 (defun spam-bogofilter-unregister-ham-routine (articles)
1712   (spam-bogofilter-register-ham-routine articles t))
1713
1714
1715 \f
1716 ;;;; spamoracle
1717 (defun spam-check-spamoracle ()
1718   "Run spamoracle on an article to determine whether it's spam."
1719   (let ((article-buffer-name (buffer-name))
1720         (spam-split-group (if spam-split-symbolic-return
1721                               'spam
1722                             spam-split-group)))
1723     (with-temp-buffer
1724       (let ((temp-buffer-name (buffer-name)))
1725         (save-excursion
1726           (set-buffer article-buffer-name)
1727           (let ((status
1728                  (apply 'call-process-region
1729                         (point-min) (point-max)
1730                         spam-spamoracle-binary
1731                         nil temp-buffer-name nil
1732                         (if spam-spamoracle-database
1733                             `("-f" ,spam-spamoracle-database "mark")
1734                           '("mark")))))
1735             (if (eq 0 status)
1736                 (progn
1737                   (set-buffer temp-buffer-name)
1738                   (goto-char (point-min))
1739                   (when (re-search-forward "^X-Spam: yes;" nil t)
1740                     spam-split-group))
1741               (error "Error running spamoracle" status))))))))
1742
1743 (defun spam-spamoracle-learn (articles article-is-spam-p &optional unregister)
1744   "Run spamoracle in training mode."
1745   (with-temp-buffer
1746     (let ((temp-buffer-name (buffer-name)))
1747       (save-excursion
1748         (goto-char (point-min))
1749         (dolist (article articles)
1750           (insert (spam-get-article-as-string article)))
1751         (let* ((arg (if (spam-xor unregister article-is-spam-p)
1752                         "-spam"
1753                       "-good"))
1754                (status
1755                 (apply 'call-process-region
1756                        (point-min) (point-max)
1757                        spam-spamoracle-binary
1758                        nil temp-buffer-name nil
1759                        (if spam-spamoracle-database
1760                            `("-f" ,spam-spamoracle-database
1761                              "add" ,arg)
1762                          `("add" ,arg)))))
1763           (when (not (eq 0 status))
1764             (error "Error running spamoracle" status)))))))
1765
1766 (defun spam-spamoracle-learn-ham (articles &optional unregister)
1767   (spam-spamoracle-learn articles nil unregister))
1768
1769 (defun spam-spamoracle-unlearn-ham (articles &optional unregister)
1770   (spam-spamoracle-learn-ham articles t))
1771
1772 (defun spam-spamoracle-learn-spam (articles &optional unregister)
1773   (spam-spamoracle-learn articles t unregister))
1774
1775 (defun spam-spamoracle-unlearn-spam (articles &optional unregister)
1776   (spam-spamoracle-learn-spam articles t))
1777
1778 \f
1779 ;;;; Hooks
1780
1781 ;;;###autoload
1782 (defun spam-initialize ()
1783   "Install the spam.el hooks and do other initialization"
1784   (interactive)
1785   (setq spam-install-hooks t)
1786   ;; TODO: How do we redo this every time spam-face is customized?
1787   (push '((eq mark gnus-spam-mark) . spam-face)
1788         gnus-summary-highlight)
1789   ;; Add hooks for loading and saving the spam stats
1790   (add-hook 'gnus-save-newsrc-hook 'spam-maybe-spam-stat-save)
1791   (add-hook 'gnus-get-top-new-news-hook 'spam-maybe-spam-stat-load)
1792   (add-hook 'gnus-startup-hook 'spam-maybe-spam-stat-load)
1793   (add-hook 'gnus-summary-prepare-exit-hook 'spam-summary-prepare-exit)
1794   (add-hook 'gnus-summary-prepare-hook 'spam-summary-prepare)
1795   (add-hook 'gnus-get-new-news-hook 'spam-setup-widening)
1796   (add-hook 'gnus-summary-prepare-hook 'spam-find-spam))
1797
1798 (defun spam-unload-hook ()
1799   "Uninstall the spam.el hooks"
1800   (interactive)
1801   (remove-hook 'gnus-save-newsrc-hook 'spam-maybe-spam-stat-save)
1802   (remove-hook 'gnus-get-top-new-news-hook 'spam-maybe-spam-stat-load)
1803   (remove-hook 'gnus-startup-hook 'spam-maybe-spam-stat-load)
1804   (remove-hook 'gnus-summary-prepare-exit-hook 'spam-summary-prepare-exit)
1805   (remove-hook 'gnus-summary-prepare-hook 'spam-summary-prepare)
1806   (remove-hook 'gnus-get-new-news-hook 'spam-setup-widening)
1807   (remove-hook 'gnus-summary-prepare-hook 'spam-find-spam))
1808
1809 (when spam-install-hooks
1810   (spam-initialize))
1811
1812 (provide 'spam)
1813
1814 ;;; spam.el ends here.
1815
1816 (provide 'spam)
1817
1818 ;;; spam.el ends here