code.delx.au - gnu-emacs/blob - lisp/gnus/mm-decode.el

   1 ;;; mm-decode.el --- Functions for decoding MIME things
   2
   3 ;; Copyright (C) 1998-2016 Free Software Foundation, Inc.
   4
   5 ;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
   6 ;;      MORIOKA Tomohiko <morioka@jaist.ac.jp>
   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 3 of the License, or
  12 ;; (at your option) 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.  If not, see <http://www.gnu.org/licenses/>.
  21
  22 ;;; Commentary:
  23
  24 ;;; Code:
  25
  26 (require 'mail-parse)
  27 (require 'mm-bodies)
  28 (eval-when-compile (require 'cl))
  29
  30 (autoload 'gnus-map-function "gnus-util")
  31 (autoload 'gnus-replace-in-string "gnus-util")
  32 (autoload 'gnus-read-shell-command "gnus-util")
  33
  34 (autoload 'mm-inline-partial "mm-partial")
  35 (autoload 'mm-inline-external-body "mm-extern")
  36 (autoload 'mm-extern-cache-contents "mm-extern")
  37 (autoload 'mm-insert-inline "mm-view")
  38
  39 (autoload 'mm-archive-decoders "mm-archive")
  40 (autoload 'mm-archive-dissect-and-inline "mm-archive")
  41 (autoload 'mm-dissect-archive "mm-archive")
  42
  43 (defvar gnus-current-window-configuration)
  44
  45 (add-hook 'gnus-exit-gnus-hook 'mm-destroy-postponed-undisplay-list)
  46 (add-hook 'gnus-exit-gnus-hook 'mm-temp-files-delete)
  47
  48 (defgroup mime-display ()
  49   "Display of MIME in mail and news articles."
  50   :link '(custom-manual "(emacs-mime)Display Customization")
  51   :version "21.1"
  52   :group 'mail
  53   :group 'news
  54   :group 'multimedia)
  55
  56 (defgroup mime-security ()
  57   "MIME security in mail and news articles."
  58   :link '(custom-manual "(emacs-mime)Display Customization")
  59   :group 'mail
  60   :group 'news
  61   :group 'multimedia)
  62
  63 (defface mm-command-output
  64   '((((class color)
  65       (background dark))
  66      (:foreground "ForestGreen"))
  67     (((class color)
  68       (background light))
  69      (:foreground "red3"))
  70     (t
  71      (:italic t)))
  72   "Face used for displaying output from commands."
  73   :group 'mime-display)
  74
  75 ;;; Convenience macros.
  76
  77 (defmacro mm-handle-buffer (handle)
  78   `(nth 0 ,handle))
  79 (defmacro mm-handle-type (handle)
  80   `(nth 1 ,handle))
  81 (defsubst mm-handle-media-type (handle)
  82   (if (stringp (car handle))
  83       (car handle)
  84     (car (mm-handle-type handle))))
  85 (defsubst mm-handle-media-supertype (handle)
  86   (car (split-string (mm-handle-media-type handle) "/")))
  87 (defsubst mm-handle-media-subtype (handle)
  88   (cadr (split-string (mm-handle-media-type handle) "/")))
  89 (defmacro mm-handle-encoding (handle)
  90   `(nth 2 ,handle))
  91 (defmacro mm-handle-undisplayer (handle)
  92   `(nth 3 ,handle))
  93 (defmacro mm-handle-set-undisplayer (handle function)
  94   `(setcar (nthcdr 3 ,handle) ,function))
  95 (defmacro mm-handle-disposition (handle)
  96   `(nth 4 ,handle))
  97 (defmacro mm-handle-description (handle)
  98   `(nth 5 ,handle))
  99 (defmacro mm-handle-cache (handle)
 100   `(nth 6 ,handle))
 101 (defmacro mm-handle-set-cache (handle contents)
 102   `(setcar (nthcdr 6 ,handle) ,contents))
 103 (defmacro mm-handle-id (handle)
 104   `(nth 7 ,handle))
 105 (defmacro mm-handle-multipart-original-buffer (handle)
 106   `(get-text-property 0 'buffer (car ,handle)))
 107 (defmacro mm-handle-multipart-from (handle)
 108   `(get-text-property 0 'from (car ,handle)))
 109 (defmacro mm-handle-multipart-ctl-parameter (handle parameter)
 110   `(get-text-property 0 ,parameter (car ,handle)))
 111
 112 (defmacro mm-make-handle (&optional buffer type encoding undisplayer
 113                                     disposition description cache
 114                                     id)
 115   `(list ,buffer ,type ,encoding ,undisplayer
 116          ,disposition ,description ,cache ,id))
 117
 118 (defcustom mm-text-html-renderer
 119   (cond ((fboundp 'libxml-parse-html-region) 'shr)
 120         ((executable-find "w3m") 'gnus-w3m)
 121         ((executable-find "links") 'links)
 122         ((executable-find "lynx") 'lynx)
 123         ((locate-library "html2text") 'html2text)
 124         (t nil))
 125   "Render of HTML contents.
 126 It is one of defined renderer types, or a rendering function.
 127 The defined renderer types are:
 128 `shr': use the built-in Gnus HTML renderer;
 129 `gnus-w3m': use Gnus renderer based on w3m;
 130 `w3m': use emacs-w3m;
 131 `w3m-standalone': use plain w3m;
 132 `links': use links;
 133 `lynx': use lynx;
 134 `html2text': use html2text;
 135 nil    : use external viewer (default web browser)."
 136   :version "24.1"
 137   :type '(choice (const shr)
 138                  (const gnus-w3m)
 139                  (const w3m :tag "emacs-w3m")
 140                  (const w3m-standalone :tag "standalone w3m" )
 141                  (const links)
 142                  (const lynx)
 143                  (const html2text)
 144                  (const nil :tag "External viewer")
 145                  (function))
 146   :group 'mime-display)
 147
 148 (defcustom mm-html-inhibit-images
 149   (if (boundp 'mm-inline-text-html-with-images)
 150       (not (symbol-value 'mm-inline-text-html-with-images))
 151     t)
 152   "Non-nil means inhibit displaying of images inline in the article body."
 153   :version "25.1"
 154   :type 'boolean
 155   :group 'mime-display)
 156
 157 (defcustom mm-html-blocked-images ""
 158   "Regexp matching image URLs to be blocked, or nil meaning not to block.
 159 Note that cid images that are embedded in a message won't be blocked."
 160   :version "25.1"
 161   :type '(choice (const :tag "Allow all" nil)
 162                  (regexp :tag "Regular expression"))
 163   :group 'mime-display)
 164
 165 (defcustom mm-w3m-safe-url-regexp "\\`cid:"
 166   "Regexp matching URLs which are considered to be safe.
 167 Some HTML mails might contain a nasty trick used by spammers, using
 168 the <img> tag which is far more evil than the [Click Here!] button.
 169 It is most likely intended to check whether the ominous spam mail has
 170 reached your eyes or not, in which case the spammer knows for sure
 171 that your email address is valid.  It is done by embedding an
 172 identifier string into a URL that you might automatically retrieve
 173 when displaying the image.  The default value is \"\\\\`cid:\" which only
 174 matches parts embedded to the Multipart/Related type MIME contents and
 175 Gnus will never connect to the spammer's site arbitrarily.  You may
 176 set this variable to nil if you consider all urls to be safe."
 177   :version "22.1"
 178   :type '(choice (regexp :tag "Regexp")
 179                  (const :tag "All URLs are safe" nil))
 180   :group 'mime-display)
 181
 182 (defcustom mm-inline-text-html-with-w3m-keymap t
 183   "If non-nil, use emacs-w3m command keys in the article buffer."
 184   :version "22.1"
 185   :type 'boolean
 186   :group 'mime-display)
 187
 188 (defcustom mm-enable-external t
 189   "Indicate whether external MIME handlers should be used.
 190
 191 If t, all defined external MIME handlers are used.  If nil, files are saved by
 192 `mailcap-save-binary-file'.  If it is the symbol `ask', you are prompted
 193 before the external MIME handler is invoked."
 194   :version "22.1"
 195   :type '(choice (const :tag "Always" t)
 196                  (const :tag "Never" nil)
 197                  (const :tag "Ask" ask))
 198   :group 'mime-display)
 199
 200 (defcustom mm-inline-media-tests
 201   '(("image/p?jpeg"
 202      mm-inline-image
 203      (lambda (handle)
 204        (mm-valid-and-fit-image-p 'jpeg handle)))
 205     ("image/png"
 206      mm-inline-image
 207      (lambda (handle)
 208        (mm-valid-and-fit-image-p 'png handle)))
 209     ("image/gif"
 210      mm-inline-image
 211      (lambda (handle)
 212        (mm-valid-and-fit-image-p 'gif handle)))
 213     ("image/tiff"
 214      mm-inline-image
 215      (lambda (handle)
 216        (mm-valid-and-fit-image-p 'tiff handle)))
 217     ("image/xbm"
 218      mm-inline-image
 219      (lambda (handle)
 220        (mm-valid-and-fit-image-p 'xbm handle)))
 221     ("image/x-xbitmap"
 222      mm-inline-image
 223      (lambda (handle)
 224        (mm-valid-and-fit-image-p 'xbm handle)))
 225     ("image/xpm"
 226      mm-inline-image
 227      (lambda (handle)
 228        (mm-valid-and-fit-image-p 'xpm handle)))
 229     ("image/x-xpixmap"
 230      mm-inline-image
 231      (lambda (handle)
 232        (mm-valid-and-fit-image-p 'xpm handle)))
 233     ("image/bmp"
 234      mm-inline-image
 235      (lambda (handle)
 236        (mm-valid-and-fit-image-p 'bmp handle)))
 237     ("image/x-portable-bitmap"
 238      mm-inline-image
 239      (lambda (handle)
 240        (mm-valid-and-fit-image-p 'pbm handle)))
 241     ("text/plain" mm-inline-text identity)
 242     ("text/enriched" mm-inline-text identity)
 243     ("text/richtext" mm-inline-text identity)
 244     ("text/x-patch" mm-display-patch-inline identity)
 245     ;; In case mime.types uses x-diff (as does Debian's mime-support-3.40).
 246     ("text/x-diff" mm-display-patch-inline identity)
 247     ("application/emacs-lisp" mm-display-elisp-inline identity)
 248     ("application/x-emacs-lisp" mm-display-elisp-inline identity)
 249     ("application/x-shellscript" mm-display-shell-script-inline identity)
 250     ("application/x-sh" mm-display-shell-script-inline identity)
 251     ("text/x-sh" mm-display-shell-script-inline identity)
 252     ("application/javascript" mm-display-javascript-inline identity)
 253     ("text/dns" mm-display-dns-inline identity)
 254     ("text/x-org" mm-display-org-inline identity)
 255     ("text/html"
 256      mm-inline-text-html
 257      (lambda (handle)
 258        mm-text-html-renderer))
 259     ("text/x-vcard"
 260      mm-inline-text-vcard
 261      (lambda (handle)
 262        (or (featurep 'vcard)
 263            (locate-library "vcard"))))
 264     ("message/delivery-status" mm-inline-text identity)
 265     ("message/rfc822" mm-inline-message identity)
 266     ("message/partial" mm-inline-partial identity)
 267     ("message/external-body" mm-inline-external-body identity)
 268     ("text/.*" mm-inline-text identity)
 269     ("application/x-.?tar\\(-.*\\)?" mm-archive-dissect-and-inline identity)
 270     ("application/zip" mm-archive-dissect-and-inline identity)
 271     ("audio/wav" mm-inline-audio
 272      (lambda (handle)
 273        (and (or (featurep 'nas-sound) (featurep 'native-sound))
 274             (device-sound-enabled-p))))
 275     ("audio/au"
 276      mm-inline-audio
 277      (lambda (handle)
 278        (and (or (featurep 'nas-sound) (featurep 'native-sound))
 279             (device-sound-enabled-p))))
 280     ("application/pgp-signature" ignore identity)
 281     ("application/x-pkcs7-signature" ignore identity)
 282     ("application/pkcs7-signature" ignore identity)
 283     ("application/x-pkcs7-mime" ignore identity)
 284     ("application/pkcs7-mime" ignore identity)
 285     ("multipart/alternative" ignore identity)
 286     ("multipart/mixed" ignore identity)
 287     ("multipart/related" ignore identity)
 288     ("image/.*"
 289      mm-inline-image
 290      (lambda (handle)
 291        (and (mm-valid-image-format-p 'imagemagick)
 292             (mm-with-unibyte-buffer
 293               (mm-insert-part handle)
 294               (let ((image
 295                      (ignore-errors
 296                        (if (fboundp 'create-image)
 297                            (create-image (buffer-string) 'imagemagick 'data-p)
 298                          (mm-create-image-xemacs
 299                           (mm-handle-media-subtype handle))))))
 300                 (when image
 301                   (setcar (cdr handle) (list "image/imagemagick"))
 302                   (mm-image-fit-p handle)))))))
 303     ;; Disable audio and image
 304     ("audio/.*" ignore ignore)
 305     ("image/.*" ignore ignore)
 306     ;; Default to displaying as text
 307     (".*" mm-inline-text mm-readable-p))
 308   "Alist of media types/tests saying whether types can be displayed inline."
 309   :type '(repeat (list (regexp :tag "MIME type")
 310                        (function :tag "Display function")
 311                        (function :tag "Display test")))
 312   :group 'mime-display)
 313
 314 (defcustom mm-inlined-types
 315   '("image/.*" "text/.*" "message/delivery-status" "message/rfc822"
 316     "message/partial" "message/external-body" "application/emacs-lisp"
 317     "application/x-emacs-lisp"
 318     "application/pgp-signature" "application/x-pkcs7-signature"
 319     "application/pkcs7-signature" "application/x-pkcs7-mime"
 320     "application/pkcs7-mime"
 321     "application/x-gtar-compressed"
 322     "application/x-tar"
 323     "application/zip"
 324     ;; Mutt still uses this even though it has already been withdrawn.
 325     "application/pgp")
 326   "List of media types that are to be displayed inline.
 327 See also `mm-inline-media-tests', which says how to display a media
 328 type inline."
 329   :type '(repeat regexp)
 330   :group 'mime-display)
 331
 332 (defcustom mm-keep-viewer-alive-types
 333   '("application/postscript" "application/msword" "application/vnd.ms-excel"
 334     "application/pdf" "application/x-dvi")
 335   "List of media types for which the external viewer will not be killed
 336 when selecting a different article."
 337   :version "22.1"
 338   :type '(repeat regexp)
 339   :group 'mime-display)
 340
 341 (defcustom mm-automatic-display
 342   '("text/plain" "text/enriched" "text/richtext" "text/html" "text/x-verbatim"
 343     "text/x-vcard" "image/.*" "message/delivery-status" "multipart/.*"
 344     "message/rfc822" "text/x-patch" "text/dns" "application/pgp-signature"
 345     "application/emacs-lisp" "application/x-emacs-lisp"
 346     "application/x-pkcs7-signature"
 347     "application/pkcs7-signature" "application/x-pkcs7-mime"
 348     "application/pkcs7-mime"
 349     ;; Mutt still uses this even though it has already been withdrawn.
 350     "application/pgp\\'"
 351      "text/x-org")
 352   "A list of MIME types to be displayed automatically."
 353   :type '(repeat regexp)
 354   :group 'mime-display)
 355
 356 (defcustom mm-attachment-override-types '("text/x-vcard"
 357                                           "application/pkcs7-mime"
 358                                           "application/x-pkcs7-mime"
 359                                           "application/pkcs7-signature"
 360                                           "application/x-pkcs7-signature")
 361   "Types to have \"attachment\" ignored if they can be displayed inline."
 362   :type '(repeat regexp)
 363   :group 'mime-display)
 364
 365 (defcustom mm-inline-override-types nil
 366   "Types to be treated as attachments even if they can be displayed inline."
 367   :type '(repeat regexp)
 368   :group 'mime-display)
 369
 370 (defcustom mm-automatic-external-display nil
 371   "List of MIME type regexps that will be displayed externally automatically."
 372   :type '(repeat regexp)
 373   :group 'mime-display)
 374
 375 (defcustom mm-discouraged-alternatives nil
 376   "List of MIME types that are discouraged when viewing multipart/alternative.
 377 Viewing agents are supposed to view the last possible part of a message,
 378 as that is supposed to be the richest.  However, users may prefer other
 379 types instead, and this list says what types are most unwanted.  If,
 380 for instance, text/html parts are very unwanted, and text/richtext are
 381 somewhat unwanted, then the value of this variable should be set
 382 to:
 383
 384  (\"text/html\" \"text/richtext\")
 385
 386 Adding \"image/.*\" might also be useful.  Spammers use it as the
 387 preferred part of multipart/alternative messages.  See also
 388 `gnus-buttonized-mime-types', to which adding \"multipart/alternative\"
 389 enables you to choose manually one of two types those mails include."
 390   :type '(repeat regexp) ;; See `mm-preferred-alternative-precedence'.
 391   :group 'mime-display)
 392
 393 (defcustom mm-tmp-directory
 394   (if (fboundp 'temp-directory)
 395       (temp-directory)
 396     (if (boundp 'temporary-file-directory)
 397         temporary-file-directory
 398       "/tmp/"))
 399   "Where mm will store its temporary files."
 400   :type 'directory
 401   :group 'mime-display)
 402
 403 (defcustom mm-inline-large-images nil
 404   "If t, then all images fit in the buffer.
 405 If `resize', try to resize the images so they fit."
 406   :type '(radio
 407           (const :tag "Inline large images as they are." t)
 408           (const :tag "Resize large images." resize)
 409           (const :tag "Do not inline large images." nil))
 410   :group 'mime-display)
 411
 412 (defcustom mm-file-name-rewrite-functions
 413   '(mm-file-name-delete-control mm-file-name-delete-gotchas)
 414   "List of functions used for rewriting file names of MIME parts.
 415 Each function takes a file name as input and returns a file name.
 416
 417 Ready-made functions include `mm-file-name-delete-control',
 418 `mm-file-name-delete-gotchas' (you should not remove these two
 419 functions), `mm-file-name-delete-whitespace',
 420 `mm-file-name-trim-whitespace', `mm-file-name-collapse-whitespace',
 421 `mm-file-name-replace-whitespace', `capitalize', `downcase',
 422 `upcase', and `upcase-initials'."
 423   :type '(list (set :inline t
 424                     (const mm-file-name-delete-control)
 425                     (const mm-file-name-delete-gotchas)
 426                     (const mm-file-name-delete-whitespace)
 427                     (const mm-file-name-trim-whitespace)
 428                     (const mm-file-name-collapse-whitespace)
 429                     (const mm-file-name-replace-whitespace)
 430                     (const capitalize)
 431                     (const downcase)
 432                     (const upcase)
 433                     (const upcase-initials)
 434                (repeat :inline t
 435                        :tag "Function"
 436                        function)))
 437   :version "23.1" ;; No Gnus
 438   :group 'mime-display)
 439
 440
 441 (defvar mm-path-name-rewrite-functions nil
 442   "*List of functions for rewriting the full file names of MIME parts.
 443 This is used when viewing parts externally, and is meant for
 444 transforming the absolute name so that non-compliant programs can find
 445 the file where it's saved.
 446
 447 Each function takes a file name as input and returns a file name.")
 448
 449 (defvar mm-file-name-replace-whitespace nil
 450   "String used for replacing whitespace characters; default is `\"_\"'.")
 451
 452 (defcustom mm-default-directory nil
 453   "The default directory where mm will save files.
 454 If not set, `default-directory' will be used."
 455   :type '(choice directory (const :tag "Default" nil))
 456   :group 'mime-display)
 457
 458 (defcustom mm-attachment-file-modes 384
 459   "Set the mode bits of saved attachments to this integer."
 460   :version "22.1"
 461   :type 'integer
 462   :group 'mime-display)
 463
 464 (defcustom mm-external-terminal-program "xterm"
 465   "The program to start an external terminal."
 466   :version "22.1"
 467   :type 'string
 468   :group 'mime-display)
 469
 470 ;;; Internal variables.
 471
 472 (defvar mm-last-shell-command "")
 473 (defvar mm-content-id-alist nil)
 474 (defvar mm-postponed-undisplay-list nil)
 475 (defvar mm-inhibit-auto-detect-attachment nil)
 476 (defvar mm-temp-files-to-be-deleted nil
 477   "List of temporary files scheduled to be deleted.")
 478 (defvar mm-temp-files-cache-file (concat ".mm-temp-files-" (user-login-name))
 479   "Name of a file that caches a list of temporary files to be deleted.
 480 The file will be saved in the directory `mm-tmp-directory'.")
 481
 482 ;; According to RFC2046, in particular, in a digest, the default
 483 ;; Content-Type value for a body part is changed from "text/plain" to
 484 ;; "message/rfc822".
 485 (defvar mm-dissect-default-type "text/plain")
 486
 487 (autoload 'mml2015-verify "mml2015")
 488 (autoload 'mml2015-verify-test "mml2015")
 489 (autoload 'mml-smime-verify "mml-smime")
 490 (autoload 'mml-smime-verify-test "mml-smime")
 491
 492 (defvar mm-verify-function-alist
 493   '(("application/pgp-signature" mml2015-verify "PGP" mml2015-verify-test)
 494     ("application/x-gnus-pgp-signature" mm-uu-pgp-signed-extract-1 "PGP"
 495      mm-uu-pgp-signed-test)
 496     ("application/pkcs7-signature" mml-smime-verify "S/MIME"
 497      mml-smime-verify-test)
 498     ("application/x-pkcs7-signature" mml-smime-verify "S/MIME"
 499      mml-smime-verify-test)))
 500
 501 (defcustom mm-verify-option 'never
 502   "Option of verifying signed parts.
 503 `never', not verify; `always', always verify;
 504 `known', only verify known protocols.  Otherwise, ask user.
 505
 506 When set to `always' or `known', you should add
 507 \"multipart/signed\" to `gnus-buttonized-mime-types' to see
 508 result of the verification."
 509   :version "22.1"
 510   :type '(choice (item always)
 511                  (item never)
 512                  (item :tag "only known protocols" known)
 513                  (item :tag "ask" nil))
 514   :group 'mime-security)
 515
 516 (autoload 'mml2015-decrypt "mml2015")
 517 (autoload 'mml2015-decrypt-test "mml2015")
 518
 519 (defvar mm-decrypt-function-alist
 520   '(("application/pgp-encrypted" mml2015-decrypt "PGP" mml2015-decrypt-test)
 521     ("application/x-gnus-pgp-encrypted" mm-uu-pgp-encrypted-extract-1 "PGP"
 522      mm-uu-pgp-encrypted-test)))
 523
 524 (defcustom mm-decrypt-option nil
 525   "Option of decrypting encrypted parts.
 526 `never', not decrypt; `always', always decrypt;
 527 `known', only decrypt known protocols.  Otherwise, ask user."
 528   :version "22.1"
 529   :type '(choice (item always)
 530                  (item never)
 531                  (item :tag "only known protocols" known)
 532                  (item :tag "ask" nil))
 533   :group 'mime-security)
 534
 535 (defvar mm-viewer-completion-map
 536   (let ((map (make-sparse-keymap 'mm-viewer-completion-map)))
 537     (set-keymap-parent map minibuffer-local-completion-map)
 538     ;; Should we bind other key to minibuffer-complete-word?
 539     (define-key map " " 'self-insert-command)
 540     map)
 541   "Keymap for input viewer with completion.")
 542
 543 ;;; The functions.
 544
 545 (defun mm-alist-to-plist (alist)
 546   "Convert association list ALIST into the equivalent property-list form.
 547 The plist is returned.  This converts from
 548
 549 \((a . 1) (b . 2) (c . 3))
 550
 551 into
 552
 553 \(a 1 b 2 c 3)
 554
 555 The original alist is not modified."
 556   (let (plist)
 557     (while alist
 558       (let ((el (car alist)))
 559         (setq plist (cons (cdr el) (cons (car el) plist))))
 560       (setq alist (cdr alist)))
 561     (nreverse plist)))
 562
 563 (defun mm-keep-viewer-alive-p (handle)
 564   "Say whether external viewer for HANDLE should stay alive."
 565   (let ((types mm-keep-viewer-alive-types)
 566         (type (mm-handle-media-type handle))
 567         ty)
 568     (catch 'found
 569       (while (setq ty (pop types))
 570         (when (string-match ty type)
 571           (throw 'found t))))))
 572
 573 (defun mm-handle-set-external-undisplayer (handle function)
 574   "Set the undisplayer for HANDLE to FUNCTION.
 575 Postpone undisplaying of viewers for types in
 576 `mm-keep-viewer-alive-types'."
 577   (if (mm-keep-viewer-alive-p handle)
 578       (let ((new-handle (copy-sequence handle)))
 579         (mm-handle-set-undisplayer new-handle function)
 580         (mm-handle-set-undisplayer handle nil)
 581         (push new-handle mm-postponed-undisplay-list))
 582     (mm-handle-set-undisplayer handle function)))
 583
 584 (defun mm-destroy-postponed-undisplay-list ()
 585   (when mm-postponed-undisplay-list
 586     (message "Destroying external MIME viewers")
 587     (mm-destroy-parts mm-postponed-undisplay-list)))
 588
 589 (defun mm-temp-files-delete ()
 590   "Delete temporary files and those parent directories.
 591 Note that the deletion may fail if a program is catching hold of a file
 592 under Windows or Cygwin.  In that case, it schedules the deletion of
 593 files left at the next time."
 594   (let* ((coding-system-for-read mm-universal-coding-system)
 595          (coding-system-for-write mm-universal-coding-system)
 596          (cache-file (expand-file-name mm-temp-files-cache-file
 597                                        mm-tmp-directory))
 598          (cache (when (file-exists-p cache-file)
 599                   (mm-with-multibyte-buffer
 600                     (insert-file-contents cache-file)
 601                     (split-string (buffer-string) "\n" t))))
 602          fails)
 603     (dolist (temp (append cache mm-temp-files-to-be-deleted))
 604       (when (and (file-exists-p temp)
 605                  (if (file-directory-p temp)
 606                      ;; A parent directory left at the previous time.
 607                      (progn
 608                        (ignore-errors (delete-directory temp))
 609                        (file-exists-p temp))
 610                    ;; Delete a temporary file and its parent directory.
 611                    (ignore-errors (delete-file temp))
 612                    (or (file-exists-p temp)
 613                        (progn
 614                          (setq temp (file-name-directory temp))
 615                          (ignore-errors (delete-directory temp))
 616                          (file-exists-p temp)))))
 617         (push temp fails)))
 618     (if fails
 619         ;; Schedule the deletion of the files left at the next time.
 620         (progn
 621           (write-region (concat (mapconcat 'identity (nreverse fails) "\n")
 622                                 "\n")
 623                         nil cache-file nil 'silent)
 624           (set-file-modes cache-file #o600))
 625       (when (file-exists-p cache-file)
 626         (ignore-errors (delete-file cache-file))))
 627     (setq mm-temp-files-to-be-deleted nil)))
 628
 629 (autoload 'message-fetch-field "message")
 630
 631 (defun mm-dissect-buffer (&optional no-strict-mime loose-mime from)
 632   "Dissect the current buffer and return a list of MIME handles.
 633 If NO-STRICT-MIME, don't require the message to have a
 634 MIME-Version header before proceeding."
 635   (save-excursion
 636     (let (ct ctl type subtype cte cd description id result)
 637       (save-restriction
 638         (mail-narrow-to-head)
 639         (when (or no-strict-mime
 640                   loose-mime
 641                   (mail-fetch-field "mime-version"))
 642           (setq ct (mail-fetch-field "content-type")
 643                 ctl (and ct (mail-header-parse-content-type ct))
 644                 cte (mail-fetch-field "content-transfer-encoding")
 645                 cd (or (mail-fetch-field "content-disposition")
 646                        (when (and ctl
 647                                   (eq 'mm-inline-text
 648                                       (cadr (mm-assoc-string-match
 649                                              mm-inline-media-tests
 650                                              (car ctl)))))
 651                          "inline"))
 652                 ;; Newlines in description should be stripped so as
 653                 ;; not to break the MIME tag into two or more lines.
 654                 description (message-fetch-field "content-description")
 655                 id (mail-fetch-field "content-id"))
 656           (unless from
 657             (setq from (mail-fetch-field "from")))
 658           ;; FIXME: In some circumstances, this code is running within
 659           ;; a unibyte macro.  mail-extract-address-components
 660           ;; creates unibyte buffers. This `if', though not a perfect
 661           ;; solution, avoids most of them.
 662           (if from
 663               (setq from (cadr (mail-extract-address-components from))))
 664           (if description
 665               (setq description (mail-decode-encoded-word-string
 666                                  description)))))
 667       (if (or (not ctl)
 668               (not (string-match "/" (car ctl))))
 669             (mm-dissect-singlepart
 670            (list mm-dissect-default-type)
 671              (and cte (intern (downcase (mail-header-strip cte))))
 672            no-strict-mime
 673            (and cd (mail-header-parse-content-disposition cd))
 674            description)
 675         (setq type (split-string (car ctl) "/"))
 676         (setq subtype (cadr type)
 677               type (car type))
 678         (setq
 679          result
 680          (cond
 681           ((equal type "multipart")
 682            (let ((mm-dissect-default-type (if (equal subtype "digest")
 683                                               "message/rfc822"
 684                                             "text/plain"))
 685                  (start (cdr (assq 'start (cdr ctl)))))
 686              (add-text-properties 0 (length (car ctl))
 687                                   (mm-alist-to-plist (cdr ctl)) (car ctl))
 688
 689              ;; what really needs to be done here is a way to link a
 690              ;; MIME handle back to it's parent MIME handle (in a multilevel
 691              ;; MIME article).  That would probably require changing
 692              ;; the mm-handle API so we simply store the multipart buffer
 693              ;; name as a text property of the "multipart/whatever" string.
 694              (add-text-properties 0 (length (car ctl))
 695                                   (list 'buffer (mm-copy-to-buffer)
 696                                         'from from
 697                                         'start start)
 698                                   (car ctl))
 699              (cons (car ctl) (mm-dissect-multipart ctl from))))
 700           (t
 701            (mm-possibly-verify-or-decrypt
 702             (mm-dissect-singlepart
 703              ctl
 704              (and cte (intern (downcase (mail-header-strip cte))))
 705              no-strict-mime
 706              (and cd (mail-header-parse-content-disposition cd))
 707              description id)
 708             ctl from))))
 709         (when id
 710           (when (string-match " *<\\(.*\\)> *" id)
 711             (setq id (match-string 1 id)))
 712           (push (cons id result) mm-content-id-alist))
 713         result))))
 714
 715 (defun mm-dissect-singlepart (ctl cte &optional force cdl description id)
 716   (when (or force
 717             (if (equal "text/plain" (car ctl))
 718                 (assoc 'format ctl)
 719               t))
 720     ;; Guess what the type of application/octet-stream parts should
 721     ;; really be.
 722     (let ((filename (cdr (assq 'filename (cdr cdl)))))
 723       (when (and (not mm-inhibit-auto-detect-attachment)
 724                  (equal (car ctl) "application/octet-stream")
 725                  filename
 726                  (string-match "\\.\\([^.]+\\)$" filename))
 727         (let ((new-type (mailcap-extension-to-mime (match-string 1 filename))))
 728           (when new-type
 729             (setcar ctl new-type)))))
 730     (let ((handle
 731            (mm-make-handle
 732             (mm-copy-to-buffer) ctl cte nil cdl description nil id))
 733           (decoder (assoc (car ctl) (mm-archive-decoders))))
 734       (if (and decoder
 735                ;; Do automatic decoding
 736                (cadr decoder)
 737                (executable-find (caddr decoder)))
 738           (mm-dissect-archive handle)
 739         handle))))
 740
 741 (defun mm-dissect-multipart (ctl from)
 742   (goto-char (point-min))
 743   (let* ((boundary (concat "\n--" (mail-content-type-get ctl 'boundary)))
 744          (close-delimiter (concat (regexp-quote boundary) "--[ \t]*$"))
 745          start parts
 746          (end (save-excursion
 747                 (goto-char (point-max))
 748                 (if (re-search-backward close-delimiter nil t)
 749                     (match-beginning 0)
 750                   (point-max))))
 751          (mm-inhibit-auto-detect-attachment
 752           (equal (car ctl) "multipart/encrypted")))
 753     (setq boundary (concat (regexp-quote boundary) "[ \t]*$"))
 754     (while (and (< (point) end) (re-search-forward boundary end t))
 755       (goto-char (match-beginning 0))
 756       (when start
 757         (save-excursion
 758           (save-restriction
 759             (narrow-to-region start (point))
 760             (setq parts (nconc (list (mm-dissect-buffer t nil from)) parts)))))
 761       (end-of-line 2)
 762       (or (looking-at boundary)
 763           (forward-line 1))
 764       (setq start (point)))
 765     (when (and start (< start end))
 766       (save-excursion
 767         (save-restriction
 768           (narrow-to-region start end)
 769           (setq parts (nconc (list (mm-dissect-buffer t nil from)) parts)))))
 770     (mm-possibly-verify-or-decrypt (nreverse parts) ctl from)))
 771
 772 (defun mm-copy-to-buffer ()
 773   "Copy the contents of the current buffer to a fresh buffer."
 774   (let ((obuf (current-buffer))
 775         (mb (mm-multibyte-p))
 776         beg)
 777     (goto-char (point-min))
 778     (search-forward-regexp "^\n" nil t)
 779     (setq beg (point))
 780     (with-current-buffer
 781           (generate-new-buffer " *mm*")
 782       ;; Preserve the data's unibyteness (for url-insert-file-contents).
 783       (mm-set-buffer-multibyte mb)
 784       (insert-buffer-substring obuf beg)
 785       (current-buffer))))
 786
 787 (defun mm-display-parts (handle &optional no-default)
 788   (if (stringp (car handle))
 789       (mapcar 'mm-display-parts (cdr handle))
 790     (if (bufferp (car handle))
 791         (save-restriction
 792           (narrow-to-region (point) (point))
 793           (mm-display-part handle)
 794           (goto-char (point-max)))
 795       (mapcar 'mm-display-parts handle))))
 796
 797 (autoload 'mailcap-parse-mailcaps "mailcap")
 798 (autoload 'mailcap-mime-info "mailcap")
 799
 800 (defun mm-head-p (&optional point)
 801   "Return non-nil if point is in the article header."
 802   (let ((point (or point (point))))
 803     (save-excursion
 804       (goto-char point)
 805       (and (not (re-search-backward "^$" nil t))
 806            (re-search-forward "^$" nil t)))))
 807
 808 (defun mm-display-part (handle &optional no-default force)
 809   "Display the MIME part represented by HANDLE.
 810 Returns nil if the part is removed; inline if displayed inline;
 811 external if displayed external."
 812   (save-excursion
 813     (mailcap-parse-mailcaps)
 814     (if (and (not force)
 815              (mm-handle-displayed-p handle))
 816         (mm-remove-part handle)
 817       (let* ((ehandle (if (equal (mm-handle-media-type handle)
 818                                  "message/external-body")
 819                           (progn
 820                             (unless (mm-handle-cache handle)
 821                               (mm-extern-cache-contents handle))
 822                             (mm-handle-cache handle))
 823                         handle))
 824              (type (mm-handle-media-type ehandle))
 825              (method (mailcap-mime-info type))
 826              (filename (or (mail-content-type-get
 827                             (mm-handle-disposition handle) 'filename)
 828                            (mail-content-type-get
 829                             (mm-handle-type handle) 'name)
 830                            "<file>"))
 831              (external mm-enable-external)
 832              (decoder (assoc (car (mm-handle-type handle))
 833                              (mm-archive-decoders))))
 834         (cond
 835          ((and decoder
 836                (executable-find (caddr decoder)))
 837           (mm-archive-dissect-and-inline handle)
 838           'inline)
 839          ((and (mm-inlinable-p ehandle)
 840                (mm-inlined-p ehandle))
 841           (when force
 842             (if (mm-head-p)
 843                 (re-search-forward "^$" nil t)
 844               (forward-line 1)))
 845           (mm-display-inline handle)
 846           'inline)
 847          ((or method
 848               (not no-default))
 849           (if (and (not method)
 850                    (equal "text" (car (split-string type "/"))))
 851               (progn
 852                 (forward-line 1)
 853                 (mm-insert-inline handle (mm-get-part handle))
 854                 'inline)
 855             (setq external
 856                   (and method         ;; If nil, we always use "save".
 857                        (or (eq mm-enable-external t)
 858                            (and (eq mm-enable-external 'ask)
 859                                 (y-or-n-p
 860                                  (concat
 861                                   "Display part (" type
 862                                   ") "
 863                                   (if (stringp method)
 864                                       (concat
 865                                        "using external program \""
 866                                        (format method filename) "\"")
 867                                     (gnus-format-message
 868                                      "by calling `%s' on the contents)" method))
 869                                   "? "))))))
 870             (if external
 871                 (mm-display-external
 872                  handle (or method 'mailcap-save-binary-file))
 873               (mm-display-external
 874                handle 'mailcap-save-binary-file)))))))))
 875
 876 (declare-function gnus-configure-windows "gnus-win" (setting &optional force))
 877 (defvar mailcap-mime-extensions)        ; mailcap-mime-info autoloads
 878 (declare-function term-mode "term" ())
 879 (declare-function term-char-mode "term" ())
 880
 881 (defun mm-display-external (handle method)
 882   "Display HANDLE using METHOD."
 883   (let ((outbuf (current-buffer)))
 884     (mm-with-unibyte-buffer
 885       (if (functionp method)
 886           (let ((cur (current-buffer)))
 887             (if (eq method 'mailcap-save-binary-file)
 888                 (progn
 889                   (set-buffer (generate-new-buffer " *mm*"))
 890                   (setq method nil))
 891               (mm-insert-part handle)
 892               (mm-add-meta-html-tag handle)
 893               (let ((win (get-buffer-window cur t)))
 894                 (when win
 895                   (select-window win)))
 896               (switch-to-buffer (generate-new-buffer " *mm*")))
 897             (buffer-disable-undo)
 898             (mm-set-buffer-file-coding-system mm-binary-coding-system)
 899             (insert-buffer-substring cur)
 900             (goto-char (point-min))
 901             (when method
 902               (message "Viewing with %s" method))
 903             (let ((mm (current-buffer))
 904                   (non-viewer (assq 'non-viewer
 905                                     (mailcap-mime-info
 906                                      (mm-handle-media-type handle) t))))
 907               (unwind-protect
 908                   (if method
 909                       (progn
 910                         (when (and (boundp 'gnus-summary-buffer)
 911                                    (bufferp gnus-summary-buffer)
 912                                    (buffer-name gnus-summary-buffer))
 913                           ;; So that we pop back to the right place, sort of.
 914                           (switch-to-buffer gnus-summary-buffer)
 915                           (switch-to-buffer mm))
 916                         (delete-other-windows)
 917                         (funcall method))
 918                     (mm-save-part handle))
 919                 (when (and (not non-viewer)
 920                            method)
 921                   (mm-handle-set-undisplayer handle mm)))))
 922         ;; The function is a string to be executed.
 923         (mm-insert-part handle)
 924         (mm-add-meta-html-tag handle)
 925         (let* ((dir (mm-make-temp-file
 926                      (expand-file-name "emm." mm-tmp-directory) 'dir))
 927                (filename (or
 928                           (mail-content-type-get
 929                            (mm-handle-disposition handle) 'filename)
 930                           (mail-content-type-get
 931                            (mm-handle-type handle) 'name)))
 932                (mime-info (mailcap-mime-info
 933                            (mm-handle-media-type handle) t))
 934                (needsterm (or (assoc "needsterm" mime-info)
 935                               (assoc "needsterminal" mime-info)))
 936                (copiousoutput (assoc "copiousoutput" mime-info))
 937                file buffer)
 938           ;; We create a private sub-directory where we store our files.
 939           (set-file-modes dir #o700)
 940           (if filename
 941               (setq file (expand-file-name
 942                           (gnus-map-function mm-file-name-rewrite-functions
 943                                              (file-name-nondirectory filename))
 944                           dir))
 945             ;; Use nametemplate (defined in RFC1524) if it is specified
 946             ;; in mailcap.
 947             (let ((suffix (cdr (assoc "nametemplate" mime-info))))
 948               (if (and suffix
 949                        (string-match "\\`%s\\(\\..+\\)\\'" suffix))
 950                   (setq suffix (match-string 1 suffix))
 951                 ;; Otherwise, use a suffix according to
 952                 ;; `mailcap-mime-extensions'.
 953                 (setq suffix (car (rassoc (mm-handle-media-type handle)
 954                                           mailcap-mime-extensions))))
 955               (setq file (mm-make-temp-file (expand-file-name "mm." dir)
 956                                             nil suffix))))
 957           (let ((coding-system-for-write mm-binary-coding-system))
 958             (write-region (point-min) (point-max) file nil 'nomesg))
 959           ;; The file is deleted after the viewer exists.  If the users edits
 960           ;; the file, changes will be lost.  Set file to read-only to make it
 961           ;; clear.
 962           (set-file-modes file #o400)
 963           (message "Viewing with %s" method)
 964           (cond
 965            (needsterm
 966             (let ((command (mm-mailcap-command
 967                             method file (mm-handle-type handle))))
 968               (unwind-protect
 969                   (if window-system
 970                       (set-process-sentinel
 971                        (start-process "*display*" nil
 972                                       mm-external-terminal-program
 973                                       "-e" shell-file-name
 974                                       shell-command-switch command)
 975                        `(lambda (process state)
 976                           (if (eq 'exit (process-status process))
 977                               (run-at-time
 978                                60.0 nil
 979                                (lambda ()
 980                                  (ignore-errors (delete-file ,file))
 981                                  (ignore-errors (delete-directory
 982                                                  ,(file-name-directory
 983                                                    file))))))))
 984                     (require 'term)
 985                     (require 'gnus-win)
 986                     (set-buffer
 987                      (setq buffer
 988                            (make-term "display"
 989                                       shell-file-name
 990                                       nil
 991                                       shell-command-switch command)))
 992                     (term-mode)
 993                     (term-char-mode)
 994                     (set-process-sentinel
 995                      (get-buffer-process buffer)
 996                      `(lambda (process state)
 997                         (when (eq 'exit (process-status process))
 998                           (ignore-errors (delete-file ,file))
 999                           (ignore-errors
1000                             (delete-directory ,(file-name-directory file)))
1001                           (gnus-configure-windows
1002                            ',gnus-current-window-configuration))))
1003                     (gnus-configure-windows 'display-term))
1004                 (mm-handle-set-external-undisplayer handle (cons file buffer))
1005                 (add-to-list 'mm-temp-files-to-be-deleted file t))
1006               (message "Displaying %s..." command))
1007             'external)
1008            (copiousoutput
1009             (with-current-buffer outbuf
1010               (forward-line 1)
1011               (mm-insert-inline
1012                handle
1013                (unwind-protect
1014                    (progn
1015                      (call-process shell-file-name nil
1016                                    (setq buffer
1017                                          (generate-new-buffer " *mm*"))
1018                                    nil
1019                                    shell-command-switch
1020                                    (mm-mailcap-command
1021                                     method file (mm-handle-type handle)))
1022                      (if (buffer-live-p buffer)
1023                          (with-current-buffer buffer
1024                            (buffer-string))))
1025                  (progn
1026                    (ignore-errors (delete-file file))
1027                    (ignore-errors (delete-directory
1028                                    (file-name-directory file)))
1029                    (ignore-errors (kill-buffer buffer))))))
1030             'inline)
1031            (t
1032             ;; Deleting the temp file should be postponed for some wrappers,
1033             ;; shell scripts, and so on, which might exit right after having
1034             ;; started a viewer command as a background job.
1035             (let ((command (mm-mailcap-command
1036                             method file (mm-handle-type handle))))
1037               (unwind-protect
1038                   (let ((process-connection-type nil))
1039                     (start-process "*display*"
1040                                    (setq buffer
1041                                          (generate-new-buffer " *mm*"))
1042                                    shell-file-name
1043                                    shell-command-switch command)
1044                     (set-process-sentinel
1045                      (get-buffer-process buffer)
1046                      (lexical-let ((outbuf outbuf)
1047                                    (file file)
1048                                    (buffer buffer)
1049                                    (command command)
1050                                    (handle handle))
1051                        (lambda (process state)
1052                          (when (eq (process-status process) 'exit)
1053                            (run-at-time
1054                             60.0 nil
1055                             (lambda ()
1056                               (ignore-errors (delete-file file))
1057                               (ignore-errors (delete-directory
1058                                               (file-name-directory file)))))
1059                            (when (buffer-live-p outbuf)
1060                              (with-current-buffer outbuf
1061                                (let ((buffer-read-only nil)
1062                                      (point (point)))
1063                                  (forward-line 2)
1064                                  (let ((start (point)))
1065                                    (mm-insert-inline
1066                                     handle (with-current-buffer buffer
1067                                              (buffer-string)))
1068                                    (put-text-property start (point)
1069                                                       'face 'mm-command-output))
1070                                  (goto-char point))))
1071                            (when (buffer-live-p buffer)
1072                              (kill-buffer buffer)))
1073                          (message "Displaying %s...done" command)))))
1074                 (mm-handle-set-external-undisplayer
1075                  handle (cons file buffer))
1076                 (add-to-list 'mm-temp-files-to-be-deleted file t))
1077               (message "Displaying %s..." command))
1078             'external)))))))
1079
1080 (defun mm-mailcap-command (method file type-list)
1081   (let ((ctl (cdr type-list))
1082         (beg 0)
1083         (uses-stdin t)
1084         out sub total)
1085     (while (string-match "%{\\([^}]+\\)}\\|'%s'\\|\"%s\"\\|%s\\|%t\\|%%"
1086                          method beg)
1087       (push (substring method beg (match-beginning 0)) out)
1088       (setq beg (match-end 0)
1089             total (match-string 0 method)
1090             sub (match-string 1 method))
1091       (cond
1092        ((string= total "%%")
1093         (push "%" out))
1094        ((or (string= total "%s")
1095             ;; We do our own quoting.
1096             (string= total "'%s'")
1097             (string= total "\"%s\""))
1098         (setq uses-stdin nil)
1099         (push (shell-quote-argument
1100                (gnus-map-function mm-path-name-rewrite-functions file)) out))
1101        ((string= total "%t")
1102         (push (shell-quote-argument (car type-list)) out))
1103        (t
1104         (push (shell-quote-argument (or (cdr (assq (intern sub) ctl)) "")) out))))
1105     (push (substring method beg (length method)) out)
1106     (when uses-stdin
1107       (push "<" out)
1108       (push (shell-quote-argument
1109              (gnus-map-function mm-path-name-rewrite-functions file))
1110             out))
1111     (mapconcat 'identity (nreverse out) "")))
1112
1113 (defun mm-remove-parts (handles)
1114   "Remove the displayed MIME parts represented by HANDLES."
1115   (if (and (listp handles)
1116            (bufferp (car handles)))
1117       (mm-remove-part handles)
1118     (let (handle)
1119       (while (setq handle (pop handles))
1120         (cond
1121          ((stringp handle)
1122           (when (buffer-live-p (get-text-property 0 'buffer handle))
1123             (kill-buffer (get-text-property 0 'buffer handle))))
1124          ((and (listp handle)
1125                (stringp (car handle)))
1126           (mm-remove-parts (cdr handle)))
1127          (t
1128           (mm-remove-part handle)))))))
1129
1130 (defun mm-destroy-parts (handles)
1131   "Remove the displayed MIME parts represented by HANDLES."
1132   (if (and (listp handles)
1133            (bufferp (car handles)))
1134       (mm-destroy-part handles)
1135     (let (handle)
1136       (while (setq handle (pop handles))
1137         (cond
1138          ((stringp handle)
1139           (when (buffer-live-p (get-text-property 0 'buffer handle))
1140             (kill-buffer (get-text-property 0 'buffer handle))))
1141          ((and (listp handle)
1142                (stringp (car handle)))
1143           (mm-destroy-parts handle))
1144          (t
1145           (mm-destroy-part handle)))))))
1146
1147 (defun mm-remove-part (handle)
1148   "Remove the displayed MIME part represented by HANDLE."
1149   (when (listp handle)
1150     (let ((object (mm-handle-undisplayer handle)))
1151       (ignore-errors
1152         (cond
1153          ;; Internally displayed part.
1154          ((mm-annotationp object)
1155           (if (featurep 'xemacs)
1156               (delete-annotation object)))
1157          ((or (functionp object)
1158               (and (listp object)
1159                    (eq (car object) 'lambda)))
1160           (funcall object))
1161          ;; Externally displayed part.
1162          ((consp object)
1163           (condition-case ()
1164               (while (get-buffer-process (cdr object))
1165                 (interrupt-process (get-buffer-process (cdr object)))
1166                 (message "Waiting for external displayer to die...")
1167                 (sit-for 1))
1168             (quit)
1169             (error))
1170           (ignore-errors (and (cdr object) (kill-buffer (cdr object))))
1171           (message "Waiting for external displayer to die...done")
1172           (ignore-errors (delete-file (car object)))
1173           (ignore-errors (delete-directory (file-name-directory
1174                                             (car object)))))
1175          ((bufferp object)
1176           (when (buffer-live-p object)
1177             (kill-buffer object)))))
1178       (mm-handle-set-undisplayer handle nil))))
1179
1180 (defun mm-display-inline (handle)
1181   (let* ((type (mm-handle-media-type handle))
1182          (function (cadr (mm-assoc-string-match mm-inline-media-tests type))))
1183     (funcall function handle)
1184     (goto-char (point-min))))
1185
1186 (defun mm-assoc-string-match (alist type)
1187   (dolist (elem alist)
1188     (when (string-match (car elem) type)
1189       (return elem))))
1190
1191 (defun mm-automatic-display-p (handle)
1192   "Say whether the user wants HANDLE to be displayed automatically."
1193   (let ((methods mm-automatic-display)
1194         (type (mm-handle-media-type handle))
1195         method result)
1196     (while (setq method (pop methods))
1197       (when (and (not (mm-inline-override-p handle))
1198                  (string-match method type))
1199         (setq result t
1200               methods nil)))
1201     result))
1202
1203 (defun mm-inlinable-p (handle &optional type)
1204   "Say whether HANDLE can be displayed inline.
1205 TYPE is the mime-type of the object; it defaults to the one given
1206 in HANDLE."
1207   (unless type (setq type (mm-handle-media-type handle)))
1208   (let ((alist mm-inline-media-tests)
1209         test)
1210     (while alist
1211       (when (string-match (caar alist) type)
1212         (setq test (caddar alist)
1213               alist nil)
1214         (setq test (funcall test handle)))
1215       (pop alist))
1216     test))
1217
1218 (defun mm-inlined-p (handle)
1219   "Say whether the user wants HANDLE to be displayed inline."
1220   (let ((methods mm-inlined-types)
1221         (type (mm-handle-media-type handle))
1222         method result)
1223     (while (setq method (pop methods))
1224       (when (and (not (mm-inline-override-p handle))
1225                  (string-match method type))
1226         (setq result t
1227               methods nil)))
1228     result))
1229
1230 (defun mm-attachment-override-p (handle)
1231   "Say whether HANDLE should have attachment behavior overridden."
1232   (let ((types mm-attachment-override-types)
1233         (type (mm-handle-media-type handle))
1234         ty)
1235     (catch 'found
1236       (while (setq ty (pop types))
1237         (when (and (string-match ty type)
1238                    (mm-inlinable-p handle))
1239           (throw 'found t))))))
1240
1241 (defun mm-inline-override-p (handle)
1242   "Say whether HANDLE should have inline behavior overridden."
1243   (let ((types mm-inline-override-types)
1244         (type (mm-handle-media-type handle))
1245         ty)
1246     (catch 'found
1247       (while (setq ty (pop types))
1248         (when (string-match ty type)
1249           (throw 'found t))))))
1250
1251 (defun mm-automatic-external-display-p (type)
1252   "Return the user-defined method for TYPE."
1253   (let ((methods mm-automatic-external-display)
1254         method result)
1255     (while (setq method (pop methods))
1256       (when (string-match method type)
1257         (setq result t
1258               methods nil)))
1259     result))
1260
1261 (defun mm-destroy-part (handle)
1262   "Destroy the data structures connected to HANDLE."
1263   (when (listp handle)
1264     (mm-remove-part handle)
1265     (when (buffer-live-p (mm-handle-buffer handle))
1266       (kill-buffer (mm-handle-buffer handle)))))
1267
1268 (defun mm-handle-displayed-p (handle)
1269   "Say whether HANDLE is displayed or not."
1270   (mm-handle-undisplayer handle))
1271
1272 ;;;
1273 ;;; Functions for outputting parts
1274 ;;;
1275
1276 (defmacro mm-with-part (handle &rest forms)
1277   "Run FORMS in the temp buffer containing the contents of HANDLE."
1278   ;; The handle-buffer's content is a sequence of bytes, not a sequence of
1279   ;; chars, so the buffer should be unibyte.  It may happen that the
1280   ;; handle-buffer is multibyte for some reason, in which case now is a good
1281   ;; time to adjust it, since we know at this point that it should
1282   ;; be unibyte.
1283   `(let* ((handle ,handle))
1284      (when (and (mm-handle-buffer handle)
1285                 (buffer-name (mm-handle-buffer handle)))
1286        (with-temp-buffer
1287          (mm-disable-multibyte)
1288          (insert-buffer-substring (mm-handle-buffer handle))
1289          (mm-decode-content-transfer-encoding
1290           (mm-handle-encoding handle)
1291           (mm-handle-media-type handle))
1292          ,@forms))))
1293 (put 'mm-with-part 'lisp-indent-function 1)
1294 (put 'mm-with-part 'edebug-form-spec '(body))
1295
1296 (defun mm-get-part (handle &optional no-cache)
1297   "Return the contents of HANDLE as a string.
1298 If NO-CACHE is non-nil, cached contents of a message/external-body part
1299 are ignored."
1300   (if (and (not no-cache)
1301            (equal (mm-handle-media-type handle) "message/external-body"))
1302       (progn
1303         (unless (mm-handle-cache handle)
1304           (mm-extern-cache-contents handle))
1305         (with-current-buffer (mm-handle-buffer (mm-handle-cache handle))
1306           (buffer-string)))
1307     (mm-with-part handle
1308       (buffer-string))))
1309
1310 (defun mm-insert-part (handle &optional no-cache)
1311   "Insert the contents of HANDLE in the current buffer.
1312 If NO-CACHE is non-nil, cached contents of a message/external-body part
1313 are ignored."
1314   (let ((text (cond ((eq (mail-content-type-get (mm-handle-type handle)
1315                                                 'charset)
1316                          'gnus-decoded)
1317                      (with-current-buffer (mm-handle-buffer handle)
1318                        (buffer-string)))
1319                     ((mm-multibyte-p)
1320                      (mm-string-to-multibyte (mm-get-part handle no-cache)))
1321                     (t
1322                      (mm-get-part handle no-cache)))))
1323     (save-restriction
1324       (widen)
1325       (goto-char
1326        (prog1
1327            (point)
1328          (if (and (eq (get-char-property (max (point-min) (1- (point))) 'face)
1329                       'mm-uu-extract)
1330                   (eq (get-char-property 0 'face text) 'mm-uu-extract))
1331              ;; Separate the extracted parts that have the same faces.
1332              (insert "\n" text)
1333            (insert text)))))))
1334
1335 (defun mm-file-name-delete-whitespace (file-name)
1336   "Remove all whitespace characters from FILE-NAME."
1337   (while (string-match "\\s-+" file-name)
1338     (setq file-name (replace-match "" t t file-name)))
1339   file-name)
1340
1341 (defun mm-file-name-trim-whitespace (file-name)
1342   "Remove leading and trailing whitespace characters from FILE-NAME."
1343   (when (string-match "\\`\\s-+" file-name)
1344     (setq file-name (substring file-name (match-end 0))))
1345   (when (string-match "\\s-+\\'" file-name)
1346     (setq file-name (substring file-name 0 (match-beginning 0))))
1347   file-name)
1348
1349 (defun mm-file-name-collapse-whitespace (file-name)
1350   "Collapse multiple whitespace characters in FILE-NAME."
1351   (while (string-match "\\s-\\s-+" file-name)
1352     (setq file-name (replace-match " " t t file-name)))
1353   file-name)
1354
1355 (defun mm-file-name-replace-whitespace (file-name)
1356   "Replace whitespace characters in FILE-NAME with underscores.
1357 Set the option `mm-file-name-replace-whitespace' to any other
1358 string if you do not like underscores."
1359   (let ((s (or mm-file-name-replace-whitespace "_")))
1360     (while (string-match "\\s-" file-name)
1361       (setq file-name (replace-match s t t file-name))))
1362   file-name)
1363
1364 (defun mm-file-name-delete-control (filename)
1365   "Delete control characters from FILENAME."
1366   (gnus-replace-in-string filename "[\x00-\x1f\x7f]" ""))
1367
1368 (defun mm-file-name-delete-gotchas (filename)
1369   "Delete shell gotchas from FILENAME."
1370   (setq filename (gnus-replace-in-string filename "[<>|]" ""))
1371   (gnus-replace-in-string filename "^[.-]+" ""))
1372
1373 (defun mm-save-part (handle &optional prompt)
1374   "Write HANDLE to a file.
1375 PROMPT overrides the default one used to ask user for a file name."
1376   (let ((filename (or (mail-content-type-get
1377                        (mm-handle-disposition handle) 'filename)
1378                       (mail-content-type-get
1379                        (mm-handle-type handle) 'name)))
1380         file)
1381     (when filename
1382       (setq filename (gnus-map-function mm-file-name-rewrite-functions
1383                                         (file-name-nondirectory filename))))
1384     (while
1385         (progn
1386           (setq file
1387                 (read-file-name
1388                  (or prompt
1389                      (format "Save MIME part to (default %s): "
1390                              (or filename "")))
1391                  (or mm-default-directory default-directory)
1392                  (expand-file-name (or filename "")
1393                                    (or mm-default-directory default-directory))))
1394           (cond ((or (not file) (equal file ""))
1395                  (message "Please enter a file name")
1396                  t)
1397                 ((and (file-directory-p file)
1398                       (not filename))
1399                  (message "Please enter a non-directory file name")
1400                  t)
1401                 (t nil)))
1402       (sit-for 2)
1403       (discard-input))
1404     (if (file-directory-p file)
1405         (setq file (expand-file-name filename file))
1406       (setq file (expand-file-name
1407                   file (or mm-default-directory default-directory))))
1408     (setq mm-default-directory (file-name-directory file))
1409     (and (or (not (file-exists-p file))
1410              (yes-or-no-p (format "File %s already exists; overwrite? "
1411                                   file)))
1412          (progn
1413            (mm-save-part-to-file handle file)
1414            file))))
1415
1416 (defun mm-add-meta-html-tag (handle &optional charset force-charset)
1417   "Add meta html tag to specify CHARSET of HANDLE in the current buffer.
1418 CHARSET defaults to the one HANDLE specifies.  Existing meta tag that
1419 specifies charset will not be modified unless FORCE-CHARSET is non-nil.
1420 Return t if meta tag is added or replaced."
1421   (when (equal (mm-handle-media-type handle) "text/html")
1422     (when (or charset
1423               (setq charset (mail-content-type-get (mm-handle-type handle)
1424                                                    'charset)))
1425       (setq charset (format "\
1426 <meta http-equiv=\"Content-Type\" content=\"text/html; charset=%s\">" charset))
1427       (let ((case-fold-search t))
1428         (goto-char (point-min))
1429         (if (re-search-forward "\
1430 <meta\\s-+http-equiv=[\"']?content-type[\"']?\\s-+content=[\"']\
1431 text/\\(\\sw+\\)\\(?:;\\s-*charset=\\([^\"'>]+\\)\\)?[^>]*>" nil t)
1432             (if (and (not force-charset)
1433                      (match-beginning 2)
1434                      (string-match "\\`html\\'" (match-string 1)))
1435                 ;; Don't modify existing meta tag.
1436                 nil
1437               ;; Replace it with the one specifying charset.
1438               (replace-match charset)
1439               t)
1440           (if (re-search-forward "<head>\\s-*" nil t)
1441               (insert charset "\n")
1442             (re-search-forward "<html\\(?:\\s-+[^>]+\\|\\s-*\\)>\\s-*" nil t)
1443             (insert "<head>\n" charset "\n</head>\n"))
1444           t)))))
1445
1446 (defun mm-save-part-to-file (handle file)
1447   (mm-with-unibyte-buffer
1448     (mm-insert-part handle)
1449     (mm-add-meta-html-tag handle)
1450     (let ((current-file-modes (default-file-modes)))
1451       (set-default-file-modes mm-attachment-file-modes)
1452       (unwind-protect
1453           ;; Don't re-compress .gz & al.  Arguably we should make
1454           ;; `file-name-handler-alist' nil, but that would chop
1455           ;; ange-ftp, which is reasonable to use here.
1456           (mm-write-region (point-min) (point-max) file nil nil nil 'binary t)
1457         (set-default-file-modes current-file-modes)))))
1458
1459 (defun mm-pipe-part (handle &optional cmd)
1460   "Pipe HANDLE to a process.
1461 Use CMD as the process."
1462   (let ((name (mail-content-type-get (mm-handle-type handle) 'name))
1463         (command (or cmd
1464                      (gnus-read-shell-command
1465                       "Shell command on MIME part: " mm-last-shell-command))))
1466     (mm-with-unibyte-buffer
1467       (mm-insert-part handle)
1468       (mm-add-meta-html-tag handle)
1469       (let ((coding-system-for-write 'binary))
1470         (shell-command-on-region (point-min) (point-max) command nil)))))
1471
1472 (autoload 'gnus-completing-read "gnus-util")
1473
1474 (defun mm-interactively-view-part (handle)
1475   "Display HANDLE using METHOD."
1476   (let* ((type (mm-handle-media-type handle))
1477          (methods
1478           (mapcar (lambda (i) (cdr (assoc 'viewer i)))
1479                   (mailcap-mime-info type 'all)))
1480          (method (let ((minibuffer-local-completion-map
1481                         mm-viewer-completion-map))
1482                    (completing-read "Viewer: " methods))))
1483     (when (string= method "")
1484       (error "No method given"))
1485     (if (string-match "^[^% \t]+$" method)
1486         (setq method (concat method " %s")))
1487     (mm-display-external handle method)))
1488
1489 (defun mm-preferred-alternative (handles &optional preferred)
1490   "Say which of HANDLES are preferred."
1491   (let ((prec (if preferred (list preferred)
1492                 (mm-preferred-alternative-precedence handles)))
1493         p h result type handle)
1494     (while (setq p (pop prec))
1495       (setq h handles)
1496       (while h
1497         (setq handle (car h))
1498         (setq type (mm-handle-media-type handle))
1499         (when (and (equal p type)
1500                    (mm-automatic-display-p handle)
1501                    (or (stringp (car handle))
1502                        (not (mm-handle-disposition handle))
1503                        (equal (car (mm-handle-disposition handle))
1504                               "inline")))
1505           (setq result handle
1506                 h nil
1507                 prec nil))
1508         (pop h)))
1509     result))
1510
1511 (defun mm-preferred-alternative-precedence (handles)
1512   "Return the precedence based on HANDLES and `mm-discouraged-alternatives'."
1513   (setq handles (reverse handles))
1514   (dolist (disc (reverse mm-discouraged-alternatives))
1515     (dolist (handle (copy-sequence handles))
1516       (when (string-match disc (mm-handle-media-type handle))
1517         (setq handles (nconc (delete handle handles) (list handle))))))
1518   ;; Remove empty parts.
1519   (dolist (handle (copy-sequence handles))
1520     (when (and (bufferp (mm-handle-buffer handle))
1521                (not (with-current-buffer (mm-handle-buffer handle)
1522                       (goto-char (point-min))
1523                       (re-search-forward "[^ \t\n]" nil t))))
1524       (setq handles (nconc (delete handle handles) (list handle)))))
1525   (mapcar #'mm-handle-media-type handles))
1526
1527 (defun mm-get-content-id (id)
1528   "Return the handle(s) referred to by ID."
1529   (cdr (assoc id mm-content-id-alist)))
1530
1531 (defconst mm-image-type-regexps
1532   '(("/\\*.*XPM.\\*/" . xpm)
1533     ("P[1-6]" . pbm)
1534     ("GIF8" . gif)
1535     ("\377\330" . jpeg)
1536     ("\211PNG\r\n" . png)
1537     ("#define" . xbm)
1538     ("\\(MM\0\\*\\)\\|\\(II\\*\0\\)" . tiff)
1539     ("%!PS" . postscript))
1540   "Alist of (REGEXP . IMAGE-TYPE) pairs used to auto-detect image types.
1541 When the first bytes of an image file match REGEXP, it is assumed to
1542 be of image type IMAGE-TYPE.")
1543
1544 ;; Steal from image.el. image-type-from-data suffers multi-line matching bug.
1545 (defun mm-image-type-from-buffer ()
1546   "Determine the image type from data in the current buffer.
1547 Value is a symbol specifying the image type or nil if type cannot
1548 be determined."
1549   (let ((types mm-image-type-regexps)
1550         type)
1551     (goto-char (point-min))
1552     (while (and types (null type))
1553       (let ((regexp (car (car types)))
1554             (image-type (cdr (car types))))
1555         (when (looking-at regexp)
1556           (setq type image-type))
1557         (setq types (cdr types))))
1558     type))
1559
1560 (defun mm-get-image (handle)
1561   "Return an image instance based on HANDLE."
1562   (let ((type (mm-handle-media-subtype handle))
1563         spec)
1564     ;; Allow some common translations.
1565     (setq type
1566           (cond
1567            ((equal type "x-pixmap")
1568             "xpm")
1569            ((equal type "x-xbitmap")
1570             "xbm")
1571            ((equal type "x-portable-bitmap")
1572             "pbm")
1573            (t type)))
1574     (or (mm-handle-cache handle)
1575         (mm-with-unibyte-buffer
1576           (mm-insert-part handle)
1577           (prog1
1578               (setq spec
1579                     (ignore-errors
1580                       ;; Avoid testing `make-glyph' since W3 may define
1581                       ;; a bogus version of it.
1582                       (if (fboundp 'create-image)
1583                           (create-image (buffer-string)
1584                                         (or (mm-image-type-from-buffer)
1585                                             (intern type))
1586                                         'data-p)
1587                         (mm-create-image-xemacs type))))
1588             (mm-handle-set-cache handle spec))))))
1589
1590 (defun mm-create-image-xemacs (type)
1591   (when (featurep 'xemacs)
1592     (cond
1593      ((equal type "xbm")
1594       ;; xbm images require special handling, since
1595       ;; the only way to create glyphs from these
1596       ;; (without a ton of work) is to write them
1597       ;; out to a file, and then create a file
1598       ;; specifier.
1599       (let ((file (mm-make-temp-file
1600                    (expand-file-name "emm" mm-tmp-directory)
1601                    nil ".xbm")))
1602         (unwind-protect
1603             (progn
1604               (write-region (point-min) (point-max) file)
1605               (make-glyph (list (cons 'x file))))
1606           (ignore-errors
1607             (delete-file file)))))
1608      (t
1609       (make-glyph
1610        (vector
1611         (or (mm-image-type-from-buffer)
1612             (intern type))
1613         :data (buffer-string)))))))
1614
1615 (declare-function image-size "image.c" (spec &optional pixels frame))
1616
1617 (defun mm-image-fit-p (handle)
1618   "Say whether the image in HANDLE will fit the current window."
1619   (let ((image (mm-get-image handle)))
1620     (or (not image)
1621         (if (featurep 'xemacs)
1622             ;; XEmacs's glyphs can actually tell us about their width, so
1623             ;; let's be nice and smart about them.
1624             (or mm-inline-large-images
1625                 (and (<= (glyph-width image) (window-pixel-width))
1626                      (<= (glyph-height image) (window-pixel-height))))
1627           (let* ((size (image-size image))
1628                  (w (car size))
1629                  (h (cdr size)))
1630             (or mm-inline-large-images
1631                 (and (<= h (1- (window-height))) ; Don't include mode line.
1632                      (<= w (window-width)))))))))
1633
1634 (defun mm-valid-image-format-p (format)
1635   "Say whether FORMAT can be displayed natively by Emacs."
1636   (cond
1637    ;; Handle XEmacs
1638    ((fboundp 'valid-image-instantiator-format-p)
1639     (valid-image-instantiator-format-p format))
1640    ;; Handle Emacs
1641    ((fboundp 'image-type-available-p)
1642     (and (display-graphic-p)
1643          (image-type-available-p format)))
1644    ;; Nobody else can do images yet.
1645    (t
1646     nil)))
1647
1648 (defun mm-valid-and-fit-image-p (format handle)
1649   "Say whether FORMAT can be displayed natively and HANDLE fits the window."
1650   (and (mm-valid-image-format-p format)
1651        (mm-image-fit-p handle)))
1652
1653 (defun mm-find-part-by-type (handles type &optional notp recursive)
1654   "Search in HANDLES for part with TYPE.
1655 If NOTP, returns first non-matching part.
1656 If RECURSIVE, search recursively."
1657   (let (handle)
1658     (while handles
1659       (if (and recursive (stringp (caar handles)))
1660           (if (setq handle (mm-find-part-by-type (cdar handles) type
1661                                                  notp recursive))
1662               (setq handles nil))
1663         (if (if notp
1664                 (not (equal (mm-handle-media-type (car handles)) type))
1665               (equal (mm-handle-media-type (car handles)) type))
1666             (setq handle (car handles)
1667                   handles nil)))
1668       (setq handles (cdr handles)))
1669     handle))
1670
1671 (defun mm-find-raw-part-by-type (ctl type &optional notp)
1672   (goto-char (point-min))
1673   (let* ((boundary (concat "--" (mm-handle-multipart-ctl-parameter ctl
1674                                                                    'boundary)))
1675          (close-delimiter (concat "^" (regexp-quote boundary) "--[ \t]*$"))
1676          start
1677          (end (save-excursion
1678                 (goto-char (point-max))
1679                 (if (re-search-backward close-delimiter nil t)
1680                     (match-beginning 0)
1681                   (point-max))))
1682          result)
1683     (setq boundary (concat "^" (regexp-quote boundary) "[ \t]*$"))
1684     (while (and (not result)
1685                 (re-search-forward boundary end t))
1686       (goto-char (match-beginning 0))
1687       (when start
1688         (save-excursion
1689           (save-restriction
1690             (narrow-to-region start (1- (point)))
1691             (when (let* ((ct (mail-fetch-field "content-type"))
1692                          (ctl (and ct (mail-header-parse-content-type ct))))
1693                     (if notp
1694                         (not (equal (car ctl) type))
1695                       (equal (car ctl) type)))
1696               (setq result (buffer-string))))))
1697       (forward-line 1)
1698       (setq start (point)))
1699     (when (and (not result) start)
1700       (save-excursion
1701         (save-restriction
1702           (narrow-to-region start end)
1703           (when (let* ((ct (mail-fetch-field "content-type"))
1704                        (ctl (and ct (mail-header-parse-content-type ct))))
1705                   (if notp
1706                       (not (equal (car ctl) type))
1707                     (equal (car ctl) type)))
1708             (setq result (buffer-string))))))
1709     result))
1710
1711 (defvar mm-security-handle nil)
1712
1713 (defsubst mm-set-handle-multipart-parameter (handle parameter value)
1714   ;; HANDLE could be a CTL.
1715   (when handle
1716     (put-text-property 0 (length (car handle)) parameter value
1717                        (car handle))))
1718
1719 (autoload 'mm-view-pkcs7 "mm-view")
1720
1721 (defun mm-possibly-verify-or-decrypt (parts ctl &optional from)
1722   (let ((type (car ctl))
1723         (subtype (cadr (split-string (car ctl) "/")))
1724         (mm-security-handle ctl) ;; (car CTL) is the type.
1725         protocol func functest)
1726     (cond
1727      ((or (equal type "application/x-pkcs7-mime")
1728           (equal type "application/pkcs7-mime"))
1729       (with-temp-buffer
1730         (when (and (cond
1731                     ((eq mm-decrypt-option 'never) nil)
1732                     ((eq mm-decrypt-option 'always) t)
1733                     ((eq mm-decrypt-option 'known) t)
1734                     (t (y-or-n-p
1735                         (format "Decrypt (S/MIME) part? "))))
1736                    (mm-view-pkcs7 parts from))
1737           (setq parts (mm-dissect-buffer t)))))
1738      ((equal subtype "signed")
1739       (unless (and (setq protocol
1740                          (mm-handle-multipart-ctl-parameter ctl 'protocol))
1741                    (not (equal protocol "multipart/mixed")))
1742         ;; The message is broken or draft-ietf-openpgp-multsig-01.
1743         (let ((protocols mm-verify-function-alist))
1744           (while protocols
1745             (if (and (or (not (setq functest (nth 3 (car protocols))))
1746                          (funcall functest parts ctl))
1747                      (mm-find-part-by-type parts (caar protocols) nil t))
1748                 (setq protocol (caar protocols)
1749                       protocols nil)
1750               (setq protocols (cdr protocols))))))
1751       (setq func (nth 1 (assoc protocol mm-verify-function-alist)))
1752       (when (cond
1753              ((eq mm-verify-option 'never) nil)
1754              ((eq mm-verify-option 'always) t)
1755              ((eq mm-verify-option 'known)
1756               (and func
1757                    (or (not (setq functest
1758                                   (nth 3 (assoc protocol
1759                                                 mm-verify-function-alist))))
1760                        (funcall functest parts ctl))))
1761              (t
1762               (y-or-n-p
1763                (format "Verify signed (%s) part? "
1764                        (or (nth 2 (assoc protocol mm-verify-function-alist))
1765                            (format "protocol=%s" protocol))))))
1766         (save-excursion
1767           (if func
1768               (setq parts (funcall func parts ctl))
1769             (mm-set-handle-multipart-parameter
1770              mm-security-handle 'gnus-details
1771              (format "Unknown sign protocol (%s)" protocol))))))
1772      ((equal subtype "encrypted")
1773       (unless (setq protocol
1774                     (mm-handle-multipart-ctl-parameter ctl 'protocol))
1775         ;; The message is broken.
1776         (let ((parts parts))
1777           (while parts
1778             (if (assoc (mm-handle-media-type (car parts))
1779                        mm-decrypt-function-alist)
1780                 (setq protocol (mm-handle-media-type (car parts))
1781                       parts nil)
1782               (setq parts (cdr parts))))))
1783       (setq func (nth 1 (assoc protocol mm-decrypt-function-alist)))
1784       (when (cond
1785              ((eq mm-decrypt-option 'never) nil)
1786              ((eq mm-decrypt-option 'always) t)
1787              ((eq mm-decrypt-option 'known)
1788               (and func
1789                    (or (not (setq functest
1790                                   (nth 3 (assoc protocol
1791                                                 mm-decrypt-function-alist))))
1792                        (funcall functest parts ctl))))
1793              (t
1794               (y-or-n-p
1795                (format "Decrypt (%s) part? "
1796                        (or (nth 2 (assoc protocol mm-decrypt-function-alist))
1797                            (format "protocol=%s" protocol))))))
1798         (save-excursion
1799           (if func
1800               (setq parts (funcall func parts ctl))
1801             (mm-set-handle-multipart-parameter
1802              mm-security-handle 'gnus-details
1803              (format "Unknown encrypt protocol (%s)" protocol))))))
1804      (t nil))
1805     parts))
1806
1807 (defun mm-multiple-handles (handles)
1808   (and (listp handles)
1809        (> (length handles) 1)
1810        (or (listp (car handles))
1811            (stringp (car handles)))))
1812
1813 (defun mm-complicated-handles (handles)
1814   (and (listp (car handles))
1815        (> (length handles) 1)))
1816
1817 (defun mm-merge-handles (handles1 handles2)
1818   (append
1819    (if (listp (car handles1))
1820        handles1
1821      (list handles1))
1822    (if (listp (car handles2))
1823        handles2
1824      (list handles2))))
1825
1826 (defun mm-readable-p (handle)
1827   "Say whether the content of HANDLE is readable."
1828   (and (< (with-current-buffer (mm-handle-buffer handle)
1829             (buffer-size)) 10000)
1830        (mm-with-unibyte-buffer
1831          (mm-insert-part handle)
1832          (and (eq (mm-body-7-or-8) '7bit)
1833               (not (mm-long-lines-p 76))))))
1834
1835 (declare-function libxml-parse-html-region "xml.c"
1836                   (start end &optional base-url discard-comments))
1837 (declare-function shr-insert-document "shr" (dom))
1838 (defvar shr-blocked-images)
1839 (defvar shr-use-fonts)
1840
1841 (defun mm-shr (handle)
1842   ;; Require since we bind its variables.
1843   (require 'shr)
1844   (let ((shr-width (if (and (boundp 'shr-use-fonts)
1845                             shr-use-fonts)
1846                        nil
1847                      fill-column))
1848         (shr-content-function (lambda (id)
1849                                 (let ((handle (mm-get-content-id id)))
1850                                   (when handle
1851                                     (mm-with-part handle
1852                                       (buffer-string))))))
1853         (shr-inhibit-images mm-html-inhibit-images)
1854         (shr-blocked-images mm-html-blocked-images)
1855         charset char)
1856     (unless handle
1857       (setq handle (mm-dissect-buffer t)))
1858     (setq charset (mail-content-type-get (mm-handle-type handle) 'charset))
1859     (save-restriction
1860       (narrow-to-region (point) (point))
1861       (shr-insert-document
1862        (mm-with-part handle
1863          (insert (prog1
1864                      (if (and charset
1865                               (setq charset
1866                                     (mm-charset-to-coding-system charset
1867                                                                  nil t))
1868                               (not (eq charset 'ascii)))
1869                          (mm-decode-coding-string (buffer-string) charset)
1870                        (mm-string-as-multibyte (buffer-string)))
1871                    (erase-buffer)
1872                    (mm-enable-multibyte)))
1873          (goto-char (point-min))
1874          (setq case-fold-search t)
1875          (while (re-search-forward
1876                  "&#\\(?:x\\([89][0-9a-f]\\)\\|\\(1[2-5][0-9]\\)\\);" nil t)
1877            (when (setq char
1878                        (cdr (assq (if (match-beginning 1)
1879                                       (string-to-number (match-string 1) 16)
1880                                     (string-to-number (match-string 2)))
1881                                   mm-extra-numeric-entities)))
1882              (replace-match (char-to-string char))))
1883          ;; Remove "soft hyphens".
1884          (goto-char (point-min))
1885          (while (search-forward "" nil t)
1886            (replace-match "" t t))
1887          (libxml-parse-html-region (point-min) (point-max))))
1888       (unless (bobp)
1889         (insert "\n"))
1890       (mm-convert-shr-links)
1891       (mm-handle-set-undisplayer
1892        handle
1893        `(lambda ()
1894           (let ((inhibit-read-only t))
1895             (delete-region ,(point-min-marker)
1896                            ,(point-max-marker))))))))
1897
1898 (defvar shr-map)
1899
1900 (autoload 'widget-convert-button "wid-edit")
1901
1902 (defun mm-convert-shr-links ()
1903   (let ((start (point-min))
1904         end)
1905     (while (and start
1906                 (< start (point-max)))
1907       (when (setq start (text-property-not-all start (point-max) 'shr-url nil))
1908         (setq end (next-single-property-change start 'shr-url nil (point-max)))
1909         (widget-convert-button
1910          'url-link start end
1911          :help-echo (get-text-property start 'help-echo)
1912          :keymap shr-map
1913          (get-text-property start 'shr-url))
1914         (put-text-property start end 'local-map nil)
1915         (dolist (overlay (overlays-at start))
1916           (overlay-put overlay 'face nil))
1917         (setq start end)))))
1918
1919 (defun mm-handle-filename (handle)
1920   "Return filename of HANDLE if any."
1921   (or (mail-content-type-get (mm-handle-type handle)
1922                              'name)
1923       (mail-content-type-get (mm-handle-disposition handle)
1924                              'filename)))
1925
1926 (provide 'mm-decode)
1927
1928 ;; Local Variables:
1929 ;; coding: utf-8
1930 ;; End:
1931
1932 ;;; mm-decode.el ends here