[bpt/emacs.git] / lisp / gnus / gnus-nocem.el

;;; gnus-nocem.el --- NoCeM pseudo-cancellation treatment
;; Copyright (C) 1995,96,97,98 Free Software Foundation, Inc.

;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
;; Keywords: news

;; 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
;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.

;;; Commentary:

;;; Code:

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

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

(require 'gnus)
(require 'nnmail)
(require 'gnus-art)
(require 'gnus-sum)
(require 'gnus-range)

(defgroup gnus-nocem nil
  "NoCeM pseudo-cancellation treatment"
  :group 'gnus-score)

(defcustom gnus-nocem-groups
  '("news.lists.filters" "news.admin.net-abuse.bulletins"
    "alt.nocem.misc" "news.admin.net-abuse.announce")
  "*List of groups that will be searched for NoCeM messages."
  :group 'gnus-nocem
  :type '(repeat (string :tag "Group")))

(defcustom gnus-nocem-issuers
  '("AutoMoose-1" "Automoose-1"		; CancelMoose[tm]
    "rbraver@ohww.norman.ok.us"		; Robert Braver
    "clewis@ferret.ocunix.on.ca"	; Chris Lewis
    "jem@xpat.com"			; Despammer from Korea
    "snowhare@xmission.com"		; Benjamin "Snowhare" Franz
    "red@redpoll.mrfs.oh.us (Richard E. Depew)" ; ARMM! ARMM!
    )
  "*List of NoCeM issuers to pay attention to.

This can also be a list of `(ISSUER CONDITIONS)' elements."
  :group 'gnus-nocem
  :type '(repeat (choice string sexp)))

(defcustom gnus-nocem-directory
  (nnheader-concat gnus-article-save-directory "NoCeM/")
  "*Directory where NoCeM files will be stored."
  :group 'gnus-nocem
  :type 'directory)

(defcustom gnus-nocem-expiry-wait 15
  "*Number of days to keep NoCeM headers in the cache."
  :group 'gnus-nocem
  :type 'integer)

(defcustom gnus-nocem-verifyer 'mc-verify
  "*Function called to verify that the NoCeM message is valid.
One likely value is `mc-verify'.  If the function in this variable
isn't bound, the message will be used unconditionally."
  :group 'gnus-nocem
  :type '(radio (function-item mc-verify)
		(function :tag "other")))

(defcustom gnus-nocem-liberal-fetch nil
  "*If t try to fetch all messages which have @@NCM in the subject.
Otherwise don't fetch messages which have references or whose message-id
matches an previously scanned and verified nocem message."
  :group 'gnus-nocem
  :type 'boolean)

;;; Internal variables

(defvar gnus-nocem-active nil)
(defvar gnus-nocem-alist nil)
(defvar gnus-nocem-touched-alist nil)
(defvar gnus-nocem-hashtb nil)
(defvar gnus-nocem-seen-message-ids nil)

;;; Functions

(defun gnus-nocem-active-file ()
  (concat (file-name-as-directory gnus-nocem-directory) "active"))

(defun gnus-nocem-cache-file ()
  (concat (file-name-as-directory gnus-nocem-directory) "cache"))

;;
;; faster lookups for group names:
;;

(defvar gnus-nocem-real-group-hashtb nil
  "Real-name mappings of subscribed groups.")

(defun gnus-fill-real-hashtb ()
  "Fill up a hash table with the real-name mappings from the user's active file."
  (setq gnus-nocem-real-group-hashtb (gnus-make-hashtable
				      (length gnus-newsrc-alist)))
  (mapcar (lambda (group)
	    (setq group (gnus-group-real-name (car group)))
	    (gnus-sethash group t gnus-nocem-real-group-hashtb))
	  gnus-newsrc-alist))

(defun gnus-nocem-scan-groups ()
  "Scan all NoCeM groups for new NoCeM messages."
  (interactive)
  (let ((groups gnus-nocem-groups)
	(gnus-inhibit-demon t)
	group active gactive articles)
    (gnus-make-directory gnus-nocem-directory)
    ;; Load any previous NoCeM headers.
    (gnus-nocem-load-cache)
    ;; Get the group name mappings:
    (gnus-fill-real-hashtb)
    ;; Read the active file if it hasn't been read yet.
    (and (file-exists-p (gnus-nocem-active-file))
	 (not gnus-nocem-active)
	 (ignore-errors
	   (load (gnus-nocem-active-file) t t t)))
    ;; Go through all groups and see whether new articles have
    ;; arrived.
    (while (setq group (pop groups))
      (if (not (setq gactive (gnus-activate-group group)))
	  ()				; This group doesn't exist.
	(setq active (nth 1 (assoc group gnus-nocem-active)))
	(when (and (not (< (cdr gactive) (car gactive))) ; Empty group.
		   (or (not active)
		       (< (cdr active) (cdr gactive))))
	  ;; Ok, there are new articles in this group, se we fetch the
	  ;; headers.
	  (save-excursion
	    (let ((dependencies (make-vector 10 nil))
		  headers header)
	      (nnheader-temp-write nil
		(setq headers
		      (if (eq 'nov
			      (gnus-retrieve-headers
			       (setq articles
				     (gnus-uncompress-range
				      (cons
				       (if active (1+ (cdr active))
					 (car gactive))
				       (cdr gactive))))
			       group))
			  (gnus-get-newsgroup-headers-xover
			   articles nil dependencies)
			(gnus-get-newsgroup-headers dependencies)))
		(while (setq header (pop headers))
		  ;; We take a closer look on all articles that have
		  ;; "@@NCM" in the subject.  Unless we already read
		  ;; this cross posted message.  Nocem messages
		  ;; are not allowed to have references, so we can
		  ;; ignore scanning followups.
		  (and (string-match "@@NCM" (mail-header-subject header))
		       (or gnus-nocem-liberal-fetch
			   (and (or (string= "" (mail-header-references
						 header))
				    (null (mail-header-references header)))
				(not (member (mail-header-message-id header)
					     gnus-nocem-seen-message-ids))))
		       (gnus-nocem-check-article group header)))))))
	(setq gnus-nocem-active
	      (cons (list group gactive)
		    (delq (assoc group gnus-nocem-active)
			  gnus-nocem-active)))))
    ;; Save the results, if any.
    (gnus-nocem-save-cache)
    (gnus-nocem-save-active)))

(defun gnus-nocem-check-article (group header)
  "Check whether the current article is an NCM article and that we want it."
  ;; Get the article.
  (gnus-message 7 "Checking article %d in %s for NoCeM..."
		(mail-header-number header) group)
  (let ((date (mail-header-date header))
	issuer b e type)
    (when (or (not date)
	      (nnmail-time-less
	       (nnmail-time-since (nnmail-date-to-time date))
	       (nnmail-days-to-time gnus-nocem-expiry-wait)))
      (gnus-request-article-this-buffer (mail-header-number header) group)
      (goto-char (point-min))
      (when (re-search-forward "-----BEGIN PGP MESSAGE-----" nil t)
	(delete-region (point-min) (match-beginning 0)))
      (when (re-search-forward "-----END PGP MESSAGE-----\n?" nil t)
	(delete-region (match-end 0) (point-max)))
      (goto-char (point-min))
      ;; The article has to have proper NoCeM headers.
      (when (and (setq b (search-forward "\n@@BEGIN NCM HEADERS\n" nil t))
		 (setq e (search-forward "\n@@BEGIN NCM BODY\n" nil t)))
	;; We get the name of the issuer.
	(narrow-to-region b e)
	(setq issuer (mail-fetch-field "issuer")
	      type (mail-fetch-field "issuer"))
	(widen)
	(if (not (gnus-nocem-message-wanted-p issuer type))
	    (message "invalid NoCeM issuer: %s" issuer)
	  (and (gnus-nocem-verify-issuer issuer) ; She is who she says she is.
	       (gnus-nocem-enter-article) ; We gobble the message.
	       (push (mail-header-message-id header) ; But don't come back for
		     gnus-nocem-seen-message-ids))))))) ; second helpings.

(defun gnus-nocem-message-wanted-p (issuer type)
  (let ((issuers gnus-nocem-issuers)
	wanted conditions condition)
    (cond
     ;; Do the quick check first.
     ((member issuer issuers)
      t)
     ((setq conditions (cdr (assoc issuer issuers)))
      ;; Check whether we want this type.
      (while (setq condition (pop conditions))
	(cond
	 ((stringp condition)
	  (setq wanted (string-match condition type)))
	 ((and (consp condition)
	       (eq (car condition) 'not)
	       (stringp (cadr condition)))
	  (setq wanted (not (string-match (cadr condition) type))))
	 (t
	  (error "Invalid NoCeM condition: %S" condition))))
      wanted))))

(defun gnus-nocem-verify-issuer (person)
  "Verify using PGP that the canceler is who she says she is."
  (if (fboundp gnus-nocem-verifyer)
      (ignore-errors
	(funcall gnus-nocem-verifyer))
    ;; If we don't have Mailcrypt, then we use the message anyway.
    t))

(defun gnus-nocem-enter-article ()
  "Enter the current article into the NoCeM cache."
  (goto-char (point-min))
  (let ((b (search-forward "\n@@BEGIN NCM BODY\n" nil t))
	(e (search-forward "\n@@END NCM BODY\n" nil t))
	(buf (current-buffer))
	ncm id group)
    (when (and b e)
      (narrow-to-region b (1+ (match-beginning 0)))
      (goto-char (point-min))
      (while (search-forward "\t" nil t)
	(cond
	 ((not (ignore-errors
		 (setq group (let ((obarray gnus-active-hashtb)) (read buf)))))
	  ;; An error.
	  )
	 ((not (symbolp group))
	  ;; Ignore invalid entries.
	  )
	 ((not (boundp group))
	  ;; Make sure all entries in the hashtb are bound.
	  (set group nil))
	 (t
	  (when (gnus-gethash (gnus-group-real-name (symbol-name group))
			      gnus-nocem-real-group-hashtb)
	    ;; Valid group.
	    (beginning-of-line)
	    (while (= (following-char) ?\t)
	      (forward-line -1))
	    (setq id (buffer-substring (point) (1- (search-forward "\t"))))
	    (unless (gnus-gethash id gnus-nocem-hashtb)
	      ;; only store if not already present
	      (gnus-sethash id t gnus-nocem-hashtb)
	      (push id ncm))
	    (forward-line 1)
	    (while (= (following-char) ?\t)
	      (forward-line 1))))))
      (when ncm
	(setq gnus-nocem-touched-alist t)
	(push (cons (let ((time (current-time))) (setcdr (cdr time) nil) time)
		    ncm)
	      gnus-nocem-alist))
      t)))

(defun gnus-nocem-load-cache ()
  "Load the NoCeM cache."
  (interactive)
  (unless gnus-nocem-alist
    ;; The buffer doesn't exist, so we create it and load the NoCeM
    ;; cache.
    (when (file-exists-p (gnus-nocem-cache-file))
      (load (gnus-nocem-cache-file) t t t)
      (gnus-nocem-alist-to-hashtb))))

(defun gnus-nocem-save-cache ()
  "Save the NoCeM cache."
  (when (and gnus-nocem-alist
	     gnus-nocem-touched-alist)
    (nnheader-temp-write (gnus-nocem-cache-file)
      (gnus-prin1 `(setq gnus-nocem-alist ',gnus-nocem-alist)))
    (setq gnus-nocem-touched-alist nil)))

(defun gnus-nocem-save-active ()
  "Save the NoCeM active file."
  (nnheader-temp-write (gnus-nocem-active-file)
    (gnus-prin1 `(setq gnus-nocem-active ',gnus-nocem-active))))

(defun gnus-nocem-alist-to-hashtb ()
  "Create a hashtable from the Message-IDs we have."
  (let* ((alist gnus-nocem-alist)
	 (pprev (cons nil alist))
	 (prev pprev)
	 (expiry (nnmail-days-to-time gnus-nocem-expiry-wait))
	 entry)
    (setq gnus-nocem-hashtb (gnus-make-hashtable (* (length alist) 51)))
    (while (setq entry (car alist))
      (if (not (nnmail-time-less (nnmail-time-since (car entry)) expiry))
	  ;; This entry has expired, so we remove it.
	  (setcdr prev (cdr alist))
	(setq prev alist)
	;; This is ok, so we enter it into the hashtable.
	(setq entry (cdr entry))
	(while entry
	  (gnus-sethash (car entry) t gnus-nocem-hashtb)
	  (setq entry (cdr entry))))
      (setq alist (cdr alist)))))

(gnus-add-shutdown 'gnus-nocem-close 'gnus)

(defun gnus-nocem-close ()
  "Clear internal NoCeM variables."
  (setq gnus-nocem-alist nil
	gnus-nocem-hashtb nil
	gnus-nocem-active nil
	gnus-nocem-touched-alist nil
	gnus-nocem-seen-message-ids nil
	gnus-nocem-real-group-hashtb nil))

(defun gnus-nocem-unwanted-article-p (id)
  "Say whether article ID in the current group is wanted."
  (and gnus-nocem-hashtb
       (gnus-gethash id gnus-nocem-hashtb)))

(provide 'gnus-nocem)

;;; gnus-nocem.el ends here
Commit	Line	Data
eec82323	1	;;; gnus-nocem.el --- NoCeM pseudo-cancellation treatment
6748645f	2	;; Copyright (C) 1995,96,97,98 Free Software Foundation, Inc.
eec82323	3
6748645f	4	;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
eec82323 LMI	5	;; Keywords: news
	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	;;; Code:
	27
0b9d8890 RS	28	(eval-when-compile (require 'cl))
0b9d8890 RS	29
6748645f LMI	30	(eval-when-compile (require 'cl))
6748645f LMI	31
eec82323 LMI	32	(require 'gnus)
	33	(require 'nnmail)
	34	(require 'gnus-art)
	35	(require 'gnus-sum)
	36	(require 'gnus-range)
	37
	38	(defgroup gnus-nocem nil
	39	"NoCeM pseudo-cancellation treatment"
	40	:group 'gnus-score)
	41
	42	(defcustom gnus-nocem-groups
	43	'("news.lists.filters" "news.admin.net-abuse.bulletins"
	44	"alt.nocem.misc" "news.admin.net-abuse.announce")
6748645f	45	"*List of groups that will be searched for NoCeM messages."
eec82323 LMI	46	:group 'gnus-nocem
	47	:type '(repeat (string :tag "Group")))
	48
	49	(defcustom gnus-nocem-issuers
a8151ef7 LMI	50	'("AutoMoose-1" "Automoose-1" ; CancelMoose[tm]
	51	"rbraver@ohww.norman.ok.us" ; Robert Braver
	52	"clewis@ferret.ocunix.on.ca" ; Chris Lewis
	53	"jem@xpat.com" ; Despammer from Korea
	54	"snowhare@xmission.com" ; Benjamin "Snowhare" Franz
	55	"red@redpoll.mrfs.oh.us (Richard E. Depew)" ; ARMM! ARMM!
	56	)
6748645f LMI	57	"*List of NoCeM issuers to pay attention to.
	58
	59	This can also be a list of `(ISSUER CONDITIONS)' elements."
eec82323	60	:group 'gnus-nocem
6748645f	61	:type '(repeat (choice string sexp)))
eec82323 LMI	62
	63	(defcustom gnus-nocem-directory
	64	(nnheader-concat gnus-article-save-directory "NoCeM/")
	65	"*Directory where NoCeM files will be stored."
	66	:group 'gnus-nocem
	67	:type 'directory)
	68
	69	(defcustom gnus-nocem-expiry-wait 15
	70	"*Number of days to keep NoCeM headers in the cache."
	71	:group 'gnus-nocem
	72	:type 'integer)
	73
	74	(defcustom gnus-nocem-verifyer 'mc-verify
	75	"*Function called to verify that the NoCeM message is valid.
	76	One likely value is `mc-verify'. If the function in this variable
	77	isn't bound, the message will be used unconditionally."
	78	:group 'gnus-nocem
	79	:type '(radio (function-item mc-verify)
	80	(function :tag "other")))
	81
	82	(defcustom gnus-nocem-liberal-fetch nil
	83	"*If t try to fetch all messages which have @@NCM in the subject.
	84	Otherwise don't fetch messages which have references or whose message-id
	85	matches an previously scanned and verified nocem message."
	86	:group 'gnus-nocem
	87	:type 'boolean)
	88
	89	;;; Internal variables
	90
	91	(defvar gnus-nocem-active nil)
	92	(defvar gnus-nocem-alist nil)
	93	(defvar gnus-nocem-touched-alist nil)
	94	(defvar gnus-nocem-hashtb nil)
	95	(defvar gnus-nocem-seen-message-ids nil)
	96
	97	;;; Functions
	98
	99	(defun gnus-nocem-active-file ()
	100	(concat (file-name-as-directory gnus-nocem-directory) "active"))
	101
	102	(defun gnus-nocem-cache-file ()
	103	(concat (file-name-as-directory gnus-nocem-directory) "cache"))
	104
a8151ef7 LMI	105	;;
	106	;; faster lookups for group names:
	107	;;
	108
	109	(defvar gnus-nocem-real-group-hashtb nil
	110	"Real-name mappings of subscribed groups.")
	111
	112	(defun gnus-fill-real-hashtb ()
6748645f	113	"Fill up a hash table with the real-name mappings from the user's active file."
a8151ef7 LMI	114	(setq gnus-nocem-real-group-hashtb (gnus-make-hashtable
	115	(length gnus-newsrc-alist)))
	116	(mapcar (lambda (group)
	117	(setq group (gnus-group-real-name (car group)))
	118	(gnus-sethash group t gnus-nocem-real-group-hashtb))
	119	gnus-newsrc-alist))
	120
eec82323 LMI	121	(defun gnus-nocem-scan-groups ()
	122	"Scan all NoCeM groups for new NoCeM messages."
	123	(interactive)
	124	(let ((groups gnus-nocem-groups)
	125	(gnus-inhibit-demon t)
	126	group active gactive articles)
	127	(gnus-make-directory gnus-nocem-directory)
	128	;; Load any previous NoCeM headers.
	129	(gnus-nocem-load-cache)
a8151ef7 LMI	130	;; Get the group name mappings:
a8151ef7 LMI	131	(gnus-fill-real-hashtb)
eec82323 LMI	132	;; Read the active file if it hasn't been read yet.
	133	(and (file-exists-p (gnus-nocem-active-file))
	134	(not gnus-nocem-active)
	135	(ignore-errors
	136	(load (gnus-nocem-active-file) t t t)))
	137	;; Go through all groups and see whether new articles have
	138	;; arrived.
	139	(while (setq group (pop groups))
	140	(if (not (setq gactive (gnus-activate-group group)))
	141	() ; This group doesn't exist.
	142	(setq active (nth 1 (assoc group gnus-nocem-active)))
	143	(when (and (not (< (cdr gactive) (car gactive))) ; Empty group.
	144	(or (not active)
	145	(< (cdr active) (cdr gactive))))
	146	;; Ok, there are new articles in this group, se we fetch the
	147	;; headers.
	148	(save-excursion
	149	(let ((dependencies (make-vector 10 nil))
	150	headers header)
	151	(nnheader-temp-write nil
	152	(setq headers
	153	(if (eq 'nov
	154	(gnus-retrieve-headers
	155	(setq articles
	156	(gnus-uncompress-range
	157	(cons
	158	(if active (1+ (cdr active))
	159	(car gactive))
	160	(cdr gactive))))
	161	group))
	162	(gnus-get-newsgroup-headers-xover
	163	articles nil dependencies)
	164	(gnus-get-newsgroup-headers dependencies)))
	165	(while (setq header (pop headers))
	166	;; We take a closer look on all articles that have
	167	;; "@@NCM" in the subject. Unless we already read
	168	;; this cross posted message. Nocem messages
	169	;; are not allowed to have references, so we can
	170	;; ignore scanning followups.
	171	(and (string-match "@@NCM" (mail-header-subject header))
	172	(or gnus-nocem-liberal-fetch
	173	(and (or (string= "" (mail-header-references
	174	header))
	175	(null (mail-header-references header)))
	176	(not (member (mail-header-message-id header)
	177	gnus-nocem-seen-message-ids))))
	178	(gnus-nocem-check-article group header)))))))
	179	(setq gnus-nocem-active
	180	(cons (list group gactive)
	181	(delq (assoc group gnus-nocem-active)
	182	gnus-nocem-active)))))
	183	;; Save the results, if any.
	184	(gnus-nocem-save-cache)
	185	(gnus-nocem-save-active)))
	186
	187	(defun gnus-nocem-check-article (group header)
	188	"Check whether the current article is an NCM article and that we want it."
	189	;; Get the article.
	190	(gnus-message 7 "Checking article %d in %s for NoCeM..."
	191	(mail-header-number header) group)
	192	(let ((date (mail-header-date header))
6748645f	193	issuer b e type)
eec82323 LMI	194	(when (or (not date)
	195	(nnmail-time-less
	196	(nnmail-time-since (nnmail-date-to-time date))
	197	(nnmail-days-to-time gnus-nocem-expiry-wait)))
	198	(gnus-request-article-this-buffer (mail-header-number header) group)
	199	(goto-char (point-min))
	200	(when (re-search-forward "-----BEGIN PGP MESSAGE-----" nil t)
	201	(delete-region (point-min) (match-beginning 0)))
	202	(when (re-search-forward "-----END PGP MESSAGE-----\n?" nil t)
	203	(delete-region (match-end 0) (point-max)))
	204	(goto-char (point-min))
	205	;; The article has to have proper NoCeM headers.
	206	(when (and (setq b (search-forward "\n@@BEGIN NCM HEADERS\n" nil t))
	207	(setq e (search-forward "\n@@BEGIN NCM BODY\n" nil t)))
	208	;; We get the name of the issuer.
	209	(narrow-to-region b e)
6748645f LMI	210	(setq issuer (mail-fetch-field "issuer")
6748645f LMI	211	type (mail-fetch-field "issuer"))
eec82323	212	(widen)
6748645f LMI	213	(if (not (gnus-nocem-message-wanted-p issuer type))
	214	(message "invalid NoCeM issuer: %s" issuer)
	215	(and (gnus-nocem-verify-issuer issuer) ; She is who she says she is.
	216	(gnus-nocem-enter-article) ; We gobble the message.
	217	(push (mail-header-message-id header) ; But don't come back for
	218	gnus-nocem-seen-message-ids))))))) ; second helpings.
	219
	220	(defun gnus-nocem-message-wanted-p (issuer type)
	221	(let ((issuers gnus-nocem-issuers)
	222	wanted conditions condition)
	223	(cond
	224	;; Do the quick check first.
	225	((member issuer issuers)
	226	t)
	227	((setq conditions (cdr (assoc issuer issuers)))
	228	;; Check whether we want this type.
	229	(while (setq condition (pop conditions))
	230	(cond
	231	((stringp condition)
	232	(setq wanted (string-match condition type)))
	233	((and (consp condition)
	234	(eq (car condition) 'not)
	235	(stringp (cadr condition)))
	236	(setq wanted (not (string-match (cadr condition) type))))
	237	(t
	238	(error "Invalid NoCeM condition: %S" condition))))
	239	wanted))))
eec82323 LMI	240
	241	(defun gnus-nocem-verify-issuer (person)
	242	"Verify using PGP that the canceler is who she says she is."
	243	(if (fboundp gnus-nocem-verifyer)
a8151ef7 LMI	244	(ignore-errors
a8151ef7 LMI	245	(funcall gnus-nocem-verifyer))
eec82323 LMI	246	;; If we don't have Mailcrypt, then we use the message anyway.
	247	t))
	248
	249	(defun gnus-nocem-enter-article ()
	250	"Enter the current article into the NoCeM cache."
	251	(goto-char (point-min))
	252	(let ((b (search-forward "\n@@BEGIN NCM BODY\n" nil t))
	253	(e (search-forward "\n@@END NCM BODY\n" nil t))
	254	(buf (current-buffer))
	255	ncm id group)
	256	(when (and b e)
	257	(narrow-to-region b (1+ (match-beginning 0)))
	258	(goto-char (point-min))
	259	(while (search-forward "\t" nil t)
	260	(cond
	261	((not (ignore-errors
	262	(setq group (let ((obarray gnus-active-hashtb)) (read buf)))))
	263	;; An error.
	264	)
	265	((not (symbolp group))
	266	;; Ignore invalid entries.
	267	)
	268	((not (boundp group))
	269	;; Make sure all entries in the hashtb are bound.
	270	(set group nil))
	271	(t
a8151ef7 LMI	272	(when (gnus-gethash (gnus-group-real-name (symbol-name group))
a8151ef7 LMI	273	gnus-nocem-real-group-hashtb)
eec82323 LMI	274	;; Valid group.
	275	(beginning-of-line)
	276	(while (= (following-char) ?\t)
	277	(forward-line -1))
	278	(setq id (buffer-substring (point) (1- (search-forward "\t"))))
	279	(unless (gnus-gethash id gnus-nocem-hashtb)
	280	;; only store if not already present
	281	(gnus-sethash id t gnus-nocem-hashtb)
	282	(push id ncm))
	283	(forward-line 1)
	284	(while (= (following-char) ?\t)
	285	(forward-line 1))))))
	286	(when ncm
	287	(setq gnus-nocem-touched-alist t)
	288	(push (cons (let ((time (current-time))) (setcdr (cdr time) nil) time)
	289	ncm)
	290	gnus-nocem-alist))
	291	t)))
	292
	293	(defun gnus-nocem-load-cache ()
	294	"Load the NoCeM cache."
	295	(interactive)
	296	(unless gnus-nocem-alist
	297	;; The buffer doesn't exist, so we create it and load the NoCeM
	298	;; cache.
	299	(when (file-exists-p (gnus-nocem-cache-file))
	300	(load (gnus-nocem-cache-file) t t t)
	301	(gnus-nocem-alist-to-hashtb))))
	302
	303	(defun gnus-nocem-save-cache ()
	304	"Save the NoCeM cache."
	305	(when (and gnus-nocem-alist
	306	gnus-nocem-touched-alist)
	307	(nnheader-temp-write (gnus-nocem-cache-file)
	308	(gnus-prin1 `(setq gnus-nocem-alist ',gnus-nocem-alist)))
	309	(setq gnus-nocem-touched-alist nil)))
	310
	311	(defun gnus-nocem-save-active ()
	312	"Save the NoCeM active file."
	313	(nnheader-temp-write (gnus-nocem-active-file)
	314	(gnus-prin1 `(setq gnus-nocem-active ',gnus-nocem-active))))
	315
	316	(defun gnus-nocem-alist-to-hashtb ()
	317	"Create a hashtable from the Message-IDs we have."
	318	(let* ((alist gnus-nocem-alist)
	319	(pprev (cons nil alist))
	320	(prev pprev)
	321	(expiry (nnmail-days-to-time gnus-nocem-expiry-wait))
	322	entry)
	323	(setq gnus-nocem-hashtb (gnus-make-hashtable (* (length alist) 51)))
	324	(while (setq entry (car alist))
	325	(if (not (nnmail-time-less (nnmail-time-since (car entry)) expiry))
	326	;; This entry has expired, so we remove it.
	327	(setcdr prev (cdr alist))
	328	(setq prev alist)
	329	;; This is ok, so we enter it into the hashtable.
	330	(setq entry (cdr entry))
	331	(while entry
	332	(gnus-sethash (car entry) t gnus-nocem-hashtb)
	333	(setq entry (cdr entry))))
	334	(setq alist (cdr alist)))))
	335
	336	(gnus-add-shutdown 'gnus-nocem-close 'gnus)
	337
338	(defun gnus-nocem-close ()
339	"Clear internal NoCeM variables."
340	(setq gnus-nocem-alist nil
341	gnus-nocem-hashtb nil
342	gnus-nocem-active nil
343	gnus-nocem-touched-alist nil
a8151ef7 LMI	344	gnus-nocem-seen-message-ids nil
a8151ef7 LMI	345	gnus-nocem-real-group-hashtb nil))
eec82323 LMI	346
	347	(defun gnus-nocem-unwanted-article-p (id)
	348	"Say whether article ID in the current group is wanted."
6748645f LMI	349	(and gnus-nocem-hashtb
6748645f LMI	350	(gnus-gethash id gnus-nocem-hashtb)))
eec82323 LMI	351
	352	(provide 'gnus-nocem)
	353
	354	;;; gnus-nocem.el ends here