lisp/gnus/mm-decode.el

   1 ;;; mm-decode.el --- Functions for decoding MIME things
   2
   3 ;; Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004,
   4 ;;   2005, 2006, 2007, 2008 Free Software Foundation, Inc.
   5
   6 ;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
   7 ;;      MORIOKA Tomohiko <morioka@jaist.ac.jp>
   8 ;; This file is part of GNU Emacs.
   9
  10 ;; GNU Emacs is free software; you can redistribute it and/or modify
  11 ;; it under the terms of the GNU General Public License as published by
  12 ;; the Free Software Foundation; either version 3, or (at your option)
  13 ;; any later version.
  14
  15 ;; GNU Emacs is distributed in the hope that it will be useful,
  16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 ;; GNU General Public License for more details.
  19
  20 ;; You should have received a copy of the GNU General Public License
  21 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  22 ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  23 ;; Boston, MA 02110-1301, USA.
  24
  25 ;;; Commentary:
  26
  27 ;;; Code:
  28
  29 (require 'mail-parse)
  30 (require 'mailcap)
  31 (require 'mm-bodies)
  32 (eval-when-compile (require 'cl)
  33                    (require 'term))
  34
  35 (eval-and-compile
  36   (autoload 'executable-find "executable")
  37   (autoload 'mm-inline-partial "mm-partial")
  38   (autoload 'mm-inline-external-body "mm-extern")
  39   (autoload 'mm-extern-cache-contents "mm-extern")
  40   (autoload 'mm-insert-inline "mm-view"))
  41
  42 (defvar gnus-current-window-configuration)
  43
  44 (add-hook 'gnus-exit-gnus-hook 'mm-destroy-postponed-undisplay-list)
  45
  46 (defgroup mime-display ()
  47   "Display of MIME in mail and news articles."
  48   :link '(custom-manual "(emacs-mime)Display Customization")
  49   :version "21.1"
  50   :group 'mail
  51   :group 'news
  52   :group 'multimedia)
  53
  54 (defgroup mime-security ()
  55   "MIME security in mail and news articles."
  56   :link '(custom-manual "(emacs-mime)Display Customization")
  57   :group 'mail
  58   :group 'news
  59   :group 'multimedia)
  60
  61 ;;; Convenience macros.
  62
  63 (defmacro mm-handle-buffer (handle)
  64   `(nth 0 ,handle))
  65 (defmacro mm-handle-type (handle)
  66   `(nth 1 ,handle))
  67 (defsubst mm-handle-media-type (handle)
  68   (if (stringp (car handle))
  69       (car handle)
  70     (car (mm-handle-type handle))))
  71 (defsubst mm-handle-media-supertype (handle)
  72   (car (split-string (mm-handle-media-type handle) "/")))
  73 (defsubst mm-handle-media-subtype (handle)
  74   (cadr (split-string (mm-handle-media-type handle) "/")))
  75 (defmacro mm-handle-encoding (handle)
  76   `(nth 2 ,handle))
  77 (defmacro mm-handle-undisplayer (handle)
  78   `(nth 3 ,handle))
  79 (defmacro mm-handle-set-undisplayer (handle function)
  80   `(setcar (nthcdr 3 ,handle) ,function))
  81 (defmacro mm-handle-disposition (handle)
  82   `(nth 4 ,handle))
  83 (defmacro mm-handle-description (handle)
  84   `(nth 5 ,handle))
  85 (defmacro mm-handle-cache (handle)
  86   `(nth 6 ,handle))
  87 (defmacro mm-handle-set-cache (handle contents)
  88   `(setcar (nthcdr 6 ,handle) ,contents))
  89 (defmacro mm-handle-id (handle)
  90   `(nth 7 ,handle))
  91 (defmacro mm-handle-multipart-original-buffer (handle)
  92   `(get-text-property 0 'buffer (car ,handle)))
  93 (defmacro mm-handle-multipart-from (handle)
  94   `(get-text-property 0 'from (car ,handle)))
  95 (defmacro mm-handle-multipart-ctl-parameter (handle parameter)
  96   `(get-text-property 0 ,parameter (car ,handle)))
  97
  98 (defmacro mm-make-handle (&optional buffer type encoding undisplayer
  99                                     disposition description cache
 100                                     id)
 101   `(list ,buffer ,type ,encoding ,undisplayer
 102          ,disposition ,description ,cache ,id))
 103
 104 (defcustom mm-text-html-renderer
 105   (cond ((locate-library "w3") 'w3)
 106         ((executable-find "w3m") (if (locate-library "w3m")
 107                                      'w3m
 108                                    'w3m-standalone))
 109         ((executable-find "links") 'links)
 110         ((executable-find "lynx") 'lynx)
 111         (t 'html2text))
 112   "Render of HTML contents.
 113 It is one of defined renderer types, or a rendering function.
 114 The defined renderer types are:
 115 `w3'   : use Emacs/W3;
 116 `w3m'  : use emacs-w3m;
 117 `w3m-standalone': use w3m;
 118 `links': use links;
 119 `lynx' : use lynx;
 120 `html2text' : use html2text;
 121 nil    : use external viewer."
 122   :version "22.1"
 123   :type '(choice (const w3)
 124                  (const w3m)
 125                  (const w3m-standalone)
 126                  (const links)
 127                  (const lynx)
 128                  (const html2text)
 129                  (const nil)
 130                  (function))
 131   :group 'mime-display)
 132
 133 (defvar mm-inline-text-html-renderer nil
 134   "Function used for rendering inline HTML contents.
 135 It is suggested to customize `mm-text-html-renderer' instead.")
 136
 137 (defcustom mm-inline-text-html-with-images nil
 138   "If non-nil, Gnus will allow retrieving images in HTML contents with
 139 the <img> tags.  It has no effect on Emacs/w3.  See also the
 140 documentation for the `mm-w3m-safe-url-regexp' variable."
 141   :version "22.1"
 142   :type 'boolean
 143   :group 'mime-display)
 144
 145 (defcustom mm-w3m-safe-url-regexp "\\`cid:"
 146   "Regexp matching URLs which are considered to be safe.
 147 Some HTML mails might contain a nasty trick used by spammers, using
 148 the <img> tag which is far more evil than the [Click Here!] button.
 149 It is most likely intended to check whether the ominous spam mail has
 150 reached your eyes or not, in which case the spammer knows for sure
 151 that your email address is valid.  It is done by embedding an
 152 identifier string into a URL that you might automatically retrieve
 153 when displaying the image.  The default value is \"\\\\`cid:\" which only
 154 matches parts embedded to the Multipart/Related type MIME contents and
 155 Gnus will never connect to the spammer's site arbitrarily.  You may
 156 set this variable to nil if you consider all urls to be safe."
 157   :version "22.1"
 158   :type '(choice (regexp :tag "Regexp")
 159                  (const :tag "All URLs are safe" nil))
 160   :group 'mime-display)
 161
 162 (defcustom mm-inline-text-html-with-w3m-keymap t
 163   "If non-nil, use emacs-w3m command keys in the article buffer."
 164   :version "22.1"
 165   :type 'boolean
 166   :group 'mime-display)
 167
 168 (defcustom mm-enable-external t
 169   "Indicate whether external MIME handlers should be used.
 170
 171 If t, all defined external MIME handlers are used.  If nil, files are saved by
 172 `mailcap-save-binary-file'.  If it is the symbol `ask', you are prompted
 173 before the external MIME handler is invoked."
 174   :version "22.1"
 175   :type '(choice (const :tag "Always" t)
 176                  (const :tag "Never" nil)
 177                  (const :tag "Ask" ask))
 178   :group 'mime-display)
 179
 180 (defcustom mm-inline-media-tests
 181   '(("image/p?jpeg"
 182      mm-inline-image
 183      (lambda (handle)
 184        (mm-valid-and-fit-image-p 'jpeg handle)))
 185     ("image/png"
 186      mm-inline-image
 187      (lambda (handle)
 188        (mm-valid-and-fit-image-p 'png handle)))
 189     ("image/gif"
 190      mm-inline-image
 191      (lambda (handle)
 192        (mm-valid-and-fit-image-p 'gif handle)))
 193     ("image/tiff"
 194      mm-inline-image
 195      (lambda (handle)
 196        (mm-valid-and-fit-image-p 'tiff handle)) )
 197     ("image/xbm"
 198      mm-inline-image
 199      (lambda (handle)
 200        (mm-valid-and-fit-image-p 'xbm handle)))
 201     ("image/x-xbitmap"
 202      mm-inline-image
 203      (lambda (handle)
 204        (mm-valid-and-fit-image-p 'xbm handle)))
 205     ("image/xpm"
 206      mm-inline-image
 207      (lambda (handle)
 208        (mm-valid-and-fit-image-p 'xpm handle)))
 209     ("image/x-xpixmap"
 210      mm-inline-image
 211      (lambda (handle)
 212        (mm-valid-and-fit-image-p 'xpm handle)))
 213     ("image/bmp"
 214      mm-inline-image
 215      (lambda (handle)
 216        (mm-valid-and-fit-image-p 'bmp handle)))
 217     ("image/x-portable-bitmap"
 218      mm-inline-image
 219      (lambda (handle)
 220        (mm-valid-and-fit-image-p 'pbm handle)))
 221     ("text/plain" mm-inline-text identity)
 222     ("text/enriched" mm-inline-text identity)
 223     ("text/richtext" mm-inline-text identity)
 224     ("text/x-patch" mm-display-patch-inline
 225      (lambda (handle)
 226        ;; If the diff-mode.el package is installed, the function is
 227        ;; autoloaded.  Checking (locate-library "diff-mode") would be trying
 228        ;; to cater to broken installations.  OTOH checking the function
 229        ;; makes it possible to install another package which provides an
 230        ;; alternative implementation of diff-mode.  --Stef
 231        (fboundp 'diff-mode)))
 232     ("application/emacs-lisp" mm-display-elisp-inline identity)
 233     ("application/x-emacs-lisp" mm-display-elisp-inline identity)
 234     ("text/html"
 235      mm-inline-text-html
 236      (lambda (handle)
 237        (or mm-inline-text-html-renderer
 238            mm-text-html-renderer)))
 239     ("text/x-vcard"
 240      mm-inline-text-vcard
 241      (lambda (handle)
 242        (or (featurep 'vcard)
 243            (locate-library "vcard"))))
 244     ("message/delivery-status" mm-inline-text identity)
 245     ("message/rfc822" mm-inline-message identity)
 246     ("message/partial" mm-inline-partial identity)
 247     ("message/external-body" mm-inline-external-body identity)
 248     ("text/.*" mm-inline-text identity)
 249     ("audio/wav" mm-inline-audio
 250      (lambda (handle)
 251        (and (or (featurep 'nas-sound) (featurep 'native-sound))
 252             (device-sound-enabled-p))))
 253     ("audio/au"
 254      mm-inline-audio
 255      (lambda (handle)
 256        (and (or (featurep 'nas-sound) (featurep 'native-sound))
 257             (device-sound-enabled-p))))
 258     ("application/pgp-signature" ignore identity)
 259     ("application/x-pkcs7-signature" ignore identity)
 260     ("application/pkcs7-signature" ignore identity)
 261     ("application/x-pkcs7-mime" ignore identity)
 262     ("application/pkcs7-mime" ignore identity)
 263     ("multipart/alternative" ignore identity)
 264     ("multipart/mixed" ignore identity)
 265     ("multipart/related" ignore identity)
 266     ;; Disable audio and image
 267     ("audio/.*" ignore ignore)
 268     ("image/.*" ignore ignore)
 269     ;; Default to displaying as text
 270     (".*" mm-inline-text mm-readable-p))
 271   "Alist of media types/tests saying whether types can be displayed inline."
 272   :type '(repeat (list (regexp :tag "MIME type")
 273                        (function :tag "Display function")
 274                        (function :tag "Display test")))
 275   :group 'mime-display)
 276
 277 (defcustom mm-inlined-types
 278   '("image/.*" "text/.*" "message/delivery-status" "message/rfc822"
 279     "message/partial" "message/external-body" "application/emacs-lisp"
 280     "application/x-emacs-lisp"
 281     "application/pgp-signature" "application/x-pkcs7-signature"
 282     "application/pkcs7-signature" "application/x-pkcs7-mime"
 283     "application/pkcs7-mime"
 284     ;; Mutt still uses this even though it has already been withdrawn.
 285     "application/pgp")
 286   "List of media types that are to be displayed inline.
 287 See also `mm-inline-media-tests', which says how to display a media
 288 type inline."
 289   :type '(repeat regexp)
 290   :group 'mime-display)
 291
 292 (defcustom mm-keep-viewer-alive-types
 293   '("application/postscript" "application/msword" "application/vnd.ms-excel"
 294     "application/pdf" "application/x-dvi")
 295   "List of media types for which the external viewer will not be killed
 296 when selecting a different article."
 297   :version "22.1"
 298   :type '(repeat regexp)
 299   :group 'mime-display)
 300
 301 (defcustom mm-automatic-display
 302   '("text/plain" "text/enriched" "text/richtext" "text/html"
 303     "text/x-vcard" "image/.*" "message/delivery-status" "multipart/.*"
 304     "message/rfc822" "text/x-patch" "application/pgp-signature"
 305     "application/emacs-lisp" "application/x-emacs-lisp"
 306     "application/x-pkcs7-signature"
 307     "application/pkcs7-signature" "application/x-pkcs7-mime"
 308     "application/pkcs7-mime"
 309     ;; Mutt still uses this even though it has already been withdrawn.
 310     "application/pgp\\'")
 311   "A list of MIME types to be displayed automatically."
 312   :type '(repeat regexp)
 313   :group 'mime-display)
 314
 315 (defcustom mm-attachment-override-types '("text/x-vcard"
 316                                           "application/pkcs7-mime"
 317                                           "application/x-pkcs7-mime"
 318                                           "application/pkcs7-signature"
 319                                           "application/x-pkcs7-signature")
 320   "Types to have \"attachment\" ignored if they can be displayed inline."
 321   :type '(repeat regexp)
 322   :group 'mime-display)
 323
 324 (defcustom mm-inline-override-types nil
 325   "Types to be treated as attachments even if they can be displayed inline."
 326   :type '(repeat regexp)
 327   :group 'mime-display)
 328
 329 (defcustom mm-automatic-external-display nil
 330   "List of MIME type regexps that will be displayed externally automatically."
 331   :type '(repeat regexp)
 332   :group 'mime-display)
 333
 334 (defcustom mm-discouraged-alternatives nil
 335   "List of MIME types that are discouraged when viewing multipart/alternative.
 336 Viewing agents are supposed to view the last possible part of a message,
 337 as that is supposed to be the richest.  However, users may prefer other
 338 types instead, and this list says what types are most unwanted.  If,
 339 for instance, text/html parts are very unwanted, and text/richtext are
 340 somewhat unwanted, then the value of this variable should be set
 341 to:
 342
 343  (\"text/html\" \"text/richtext\")
 344
 345 Adding \"image/.*\" might also be useful.  Spammers use it as the
 346 prefered part of multipart/alternative messages.  See also
 347 `gnus-buttonized-mime-types', to which adding \"multipart/alternative\"
 348 enables you to choose manually one of two types those mails include."
 349   :type '(repeat regexp) ;; See `mm-preferred-alternative-precedence'.
 350   :group 'mime-display)
 351
 352 (defcustom mm-tmp-directory
 353   (if (fboundp 'temp-directory)
 354       (temp-directory)
 355     (if (boundp 'temporary-file-directory)
 356         temporary-file-directory
 357       "/tmp/"))
 358   "Where mm will store its temporary files."
 359   :type 'directory
 360   :group 'mime-display)
 361
 362 (defcustom mm-inline-large-images nil
 363   "If non-nil, then all images fit in the buffer."
 364   :type 'boolean
 365   :group 'mime-display)
 366
 367 (defvar mm-file-name-rewrite-functions
 368   '(mm-file-name-delete-control mm-file-name-delete-gotchas)
 369   "*List of functions used for rewriting file names of MIME parts.
 370 Each function takes a file name as input and returns a file name.
 371
 372 Ready-made functions include
 373 `mm-file-name-delete-control'
 374 `mm-file-name-delete-gotchas'
 375 `mm-file-name-delete-whitespace',
 376 `mm-file-name-trim-whitespace',
 377 `mm-file-name-collapse-whitespace',
 378 `mm-file-name-replace-whitespace',
 379 `capitalize', `downcase', `upcase', and
 380 `upcase-initials'.")
 381
 382 (defvar mm-path-name-rewrite-functions nil
 383   "*List of functions for rewriting the full file names of MIME parts.
 384 This is used when viewing parts externally, and is meant for
 385 transforming the absolute name so that non-compliant programs can find
 386 the file where it's saved.
 387
 388 Each function takes a file name as input and returns a file name.")
 389
 390 (defvar mm-file-name-replace-whitespace nil
 391   "String used for replacing whitespace characters; default is `\"_\"'.")
 392
 393 (defcustom mm-default-directory nil
 394   "The default directory where mm will save files.
 395 If not set, `default-directory' will be used."
 396   :type '(choice directory (const :tag "Default" nil))
 397   :group 'mime-display)
 398
 399 (defcustom mm-attachment-file-modes 384
 400   "Set the mode bits of saved attachments to this integer."
 401   :version "22.1"
 402   :type 'integer
 403   :group 'mime-display)
 404
 405 (defcustom mm-external-terminal-program "xterm"
 406   "The program to start an external terminal."
 407   :version "22.1"
 408   :type 'string
 409   :group 'mime-display)
 410
 411 ;;; Internal variables.
 412
 413 (defvar mm-last-shell-command "")
 414 (defvar mm-content-id-alist nil)
 415 (defvar mm-postponed-undisplay-list nil)
 416
 417 ;; According to RFC2046, in particular, in a digest, the default
 418 ;; Content-Type value for a body part is changed from "text/plain" to
 419 ;; "message/rfc822".
 420 (defvar mm-dissect-default-type "text/plain")
 421
 422 (autoload 'mml2015-verify "mml2015")
 423 (autoload 'mml2015-verify-test "mml2015")
 424 (autoload 'mml-smime-verify "mml-smime")
 425 (autoload 'mml-smime-verify-test "mml-smime")
 426
 427 (defvar mm-verify-function-alist
 428   '(("application/pgp-signature" mml2015-verify "PGP" mml2015-verify-test)
 429     ("application/x-gnus-pgp-signature" mm-uu-pgp-signed-extract-1 "PGP"
 430      mm-uu-pgp-signed-test)
 431     ("application/pkcs7-signature" mml-smime-verify "S/MIME"
 432      mml-smime-verify-test)
 433     ("application/x-pkcs7-signature" mml-smime-verify "S/MIME"
 434      mml-smime-verify-test)))
 435
 436 (defcustom mm-verify-option 'never
 437   "Option of verifying signed parts.
 438 `never', not verify; `always', always verify;
 439 `known', only verify known protocols.  Otherwise, ask user."
 440   :version "22.1"
 441   :type '(choice (item always)
 442                  (item never)
 443                  (item :tag "only known protocols" known)
 444                  (item :tag "ask" nil))
 445   :group 'mime-security)
 446
 447 (autoload 'mml2015-decrypt "mml2015")
 448 (autoload 'mml2015-decrypt-test "mml2015")
 449
 450 (defvar mm-decrypt-function-alist
 451   '(("application/pgp-encrypted" mml2015-decrypt "PGP" mml2015-decrypt-test)
 452     ("application/x-gnus-pgp-encrypted" mm-uu-pgp-encrypted-extract-1 "PGP"
 453      mm-uu-pgp-encrypted-test)))
 454
 455 (defcustom mm-decrypt-option nil
 456   "Option of decrypting encrypted parts.
 457 `never', not decrypt; `always', always decrypt;
 458 `known', only decrypt known protocols.  Otherwise, ask user."
 459   :version "22.1"
 460   :type '(choice (item always)
 461                  (item never)
 462                  (item :tag "only known protocols" known)
 463                  (item :tag "ask" nil))
 464   :group 'mime-security)
 465
 466 (defvar mm-viewer-completion-map
 467   (let ((map (make-sparse-keymap 'mm-viewer-completion-map)))
 468     (set-keymap-parent map minibuffer-local-completion-map)
 469     ;; Should we bind other key to minibuffer-complete-word?
 470     (define-key map " " 'self-insert-command)
 471     map)
 472   "Keymap for input viewer with completion.")
 473
 474 (defvar mm-viewer-completion-map
 475   (let ((map (make-sparse-keymap 'mm-viewer-completion-map)))
 476     (set-keymap-parent map minibuffer-local-completion-map)
 477     ;; Should we bind other key to minibuffer-complete-word?
 478     (define-key map " " 'self-insert-command)
 479     map)
 480   "Keymap for input viewer with completion.")
 481
 482 ;;; The functions.
 483
 484 (defun mm-alist-to-plist (alist)
 485   "Convert association list ALIST into the equivalent property-list form.
 486 The plist is returned.  This converts from
 487
 488 \((a . 1) (b . 2) (c . 3))
 489
 490 into
 491
 492 \(a 1 b 2 c 3)
 493
 494 The original alist is not modified.  See also `destructive-alist-to-plist'."
 495   (let (plist)
 496     (while alist
 497       (let ((el (car alist)))
 498         (setq plist (cons (cdr el) (cons (car el) plist))))
 499       (setq alist (cdr alist)))
 500     (nreverse plist)))
 501
 502 (defun mm-keep-viewer-alive-p (handle)
 503   "Say whether external viewer for HANDLE should stay alive."
 504   (let ((types mm-keep-viewer-alive-types)
 505         (type (mm-handle-media-type handle))
 506         ty)
 507     (catch 'found
 508       (while (setq ty (pop types))
 509         (when (string-match ty type)
 510           (throw 'found t))))))
 511
 512 (defun mm-handle-set-external-undisplayer (handle function)
 513   "Set the undisplayer for HANDLE to FUNCTION.
 514 Postpone undisplaying of viewers for types in
 515 `mm-keep-viewer-alive-types'."
 516   (if (mm-keep-viewer-alive-p handle)
 517       (let ((new-handle (copy-sequence handle)))
 518         (mm-handle-set-undisplayer new-handle function)
 519         (mm-handle-set-undisplayer handle nil)
 520         (push new-handle mm-postponed-undisplay-list))
 521     (mm-handle-set-undisplayer handle function)))
 522
 523 (defun mm-destroy-postponed-undisplay-list ()
 524   (when mm-postponed-undisplay-list
 525     (message "Destroying external MIME viewers")
 526     (mm-destroy-parts mm-postponed-undisplay-list)))
 527
 528 (defun mm-dissect-buffer (&optional no-strict-mime loose-mime from)
 529   "Dissect the current buffer and return a list of MIME handles."
 530   (save-excursion
 531     (let (ct ctl type subtype cte cd description id result)
 532       (save-restriction
 533         (mail-narrow-to-head)
 534         (when (or no-strict-mime
 535                   loose-mime
 536                   (mail-fetch-field "mime-version"))
 537           (setq ct (mail-fetch-field "content-type")
 538                 ctl (and ct (mail-header-parse-content-type ct))
 539                 cte (mail-fetch-field "content-transfer-encoding")
 540                 cd (mail-fetch-field "content-disposition")
 541                 description (mail-fetch-field "content-description")
 542                 id (mail-fetch-field "content-id"))
 543           (unless from
 544             (setq from (mail-fetch-field "from")))
 545           ;; FIXME: In some circumstances, this code is running within
 546           ;; an unibyte macro.  mail-extract-address-components
 547           ;; creates unibyte buffers. This `if', though not a perfect
 548           ;; solution, avoids most of them.
 549           (if from
 550               (setq from (cadr (mail-extract-address-components from))))))
 551       (when cte
 552         (setq cte (mail-header-strip cte)))
 553       (if (or (not ctl)
 554               (not (string-match "/" (car ctl))))
 555           (mm-dissect-singlepart
 556            (list mm-dissect-default-type)
 557            (and cte (intern (downcase (mail-header-remove-whitespace
 558                                        (mail-header-remove-comments
 559                                         cte)))))
 560            no-strict-mime
 561            (and cd (mail-header-parse-content-disposition cd))
 562            description)
 563         (setq type (split-string (car ctl) "/"))
 564         (setq subtype (cadr type)
 565               type (car type))
 566         (setq
 567          result
 568          (cond
 569           ((equal type "multipart")
 570            (let ((mm-dissect-default-type (if (equal subtype "digest")
 571                                               "message/rfc822"
 572                                             "text/plain"))
 573                  (start (cdr (assq 'start (cdr ctl)))))
 574              (add-text-properties 0 (length (car ctl))
 575                                   (mm-alist-to-plist (cdr ctl)) (car ctl))
 576
 577              ;; what really needs to be done here is a way to link a
 578              ;; MIME handle back to it's parent MIME handle (in a multilevel
 579              ;; MIME article).  That would probably require changing
 580              ;; the mm-handle API so we simply store the multipart buffer
 581              ;; name as a text property of the "multipart/whatever" string.
 582              (add-text-properties 0 (length (car ctl))
 583                                   (list 'buffer (mm-copy-to-buffer)
 584                                         'from from
 585                                         'start start)
 586                                   (car ctl))
 587              (cons (car ctl) (mm-dissect-multipart ctl from))))
 588           (t
 589            (mm-possibly-verify-or-decrypt
 590             (mm-dissect-singlepart
 591              ctl
 592              (and cte (intern (downcase (mail-header-remove-whitespace
 593                                          (mail-header-remove-comments
 594                                           cte)))))
 595              no-strict-mime
 596              (and cd (mail-header-parse-content-disposition cd))
 597              description id)
 598             ctl))))
 599         (when id
 600           (when (string-match " *<\\(.*\\)> *" id)
 601             (setq id (match-string 1 id)))
 602           (push (cons id result) mm-content-id-alist))
 603         result))))
 604
 605 (defun mm-dissect-singlepart (ctl cte &optional force cdl description id)
 606   (when (or force
 607             (if (equal "text/plain" (car ctl))
 608                 (assoc 'format ctl)
 609               t))
 610     (mm-make-handle
 611      (mm-copy-to-buffer) ctl cte nil cdl description nil id)))
 612
 613 (defun mm-dissect-multipart (ctl from)
 614   (goto-char (point-min))
 615   (let* ((boundary (concat "\n--" (mail-content-type-get ctl 'boundary)))
 616          (close-delimiter (concat (regexp-quote boundary) "--[ \t]*$"))
 617          start parts
 618          (end (save-excursion
 619                 (goto-char (point-max))
 620                 (if (re-search-backward close-delimiter nil t)
 621                     (match-beginning 0)
 622                   (point-max)))))
 623     (setq boundary (concat (regexp-quote boundary) "[ \t]*$"))
 624     (while (and (< (point) end) (re-search-forward boundary end t))
 625       (goto-char (match-beginning 0))
 626       (when start
 627         (save-excursion
 628           (save-restriction
 629             (narrow-to-region start (point))
 630             (setq parts (nconc (list (mm-dissect-buffer t nil from)) parts)))))
 631       (end-of-line 2)
 632       (or (looking-at boundary)
 633           (forward-line 1))
 634       (setq start (point)))
 635     (when (and start (< start end))
 636       (save-excursion
 637         (save-restriction
 638           (narrow-to-region start end)
 639           (setq parts (nconc (list (mm-dissect-buffer t nil from)) parts)))))
 640     (mm-possibly-verify-or-decrypt (nreverse parts) ctl)))
 641
 642 (defun mm-copy-to-buffer ()
 643   "Copy the contents of the current buffer to a fresh buffer."
 644     (let ((obuf (current-buffer))
 645           beg)
 646       (goto-char (point-min))
 647       (search-forward-regexp "^\n" nil t)
 648       (setq beg (point))
 649     (with-current-buffer
 650        ;; Preserve the data's unibyteness (for url-insert-file-contents).
 651        (let ((default-enable-multibyte-characters (mm-multibyte-p)))
 652           (generate-new-buffer " *mm*"))
 653       (insert-buffer-substring obuf beg)
 654       (current-buffer))))
 655
 656 (defun mm-display-parts (handle &optional no-default)
 657   (if (stringp (car handle))
 658       (mapcar 'mm-display-parts (cdr handle))
 659     (if (bufferp (car handle))
 660         (save-restriction
 661           (narrow-to-region (point) (point))
 662           (mm-display-part handle)
 663           (goto-char (point-max)))
 664       (mapcar 'mm-display-parts handle))))
 665
 666 (defun mm-display-part (handle &optional no-default)
 667   "Display the MIME part represented by HANDLE.
 668 Returns nil if the part is removed; inline if displayed inline;
 669 external if displayed external."
 670   (save-excursion
 671     (mailcap-parse-mailcaps)
 672     (if (mm-handle-displayed-p handle)
 673         (mm-remove-part handle)
 674       (let* ((ehandle (if (equal (mm-handle-media-type handle)
 675                                  "message/external-body")
 676                           (progn
 677                             (unless (mm-handle-cache handle)
 678                               (mm-extern-cache-contents handle))
 679                             (mm-handle-cache handle))
 680                         handle))
 681              (type (mm-handle-media-type ehandle))
 682              (method (mailcap-mime-info type))
 683              (filename (or (mail-content-type-get
 684                             (mm-handle-disposition handle) 'filename)
 685                            (mail-content-type-get
 686                             (mm-handle-type handle) 'name)
 687                            "<file>"))
 688              (external mm-enable-external))
 689         (if (and (mm-inlinable-p ehandle)
 690                  (mm-inlined-p ehandle))
 691             (progn
 692               (forward-line 1)
 693               (mm-display-inline handle)
 694               'inline)
 695           (when (or method
 696                     (not no-default))
 697             (if (and (not method)
 698                      (equal "text" (car (split-string type "/"))))
 699                 (progn
 700                   (forward-line 1)
 701                   (mm-insert-inline handle (mm-get-part handle))
 702                   'inline)
 703               (setq external
 704                     (and method ;; If nil, we always use "save".
 705                        (stringp method) ;; 'mailcap-save-binary-file
 706                        (or (eq mm-enable-external t)
 707                            (and (eq mm-enable-external 'ask)
 708                                 (y-or-n-p
 709                                  (concat
 710                                   "Display part (" type
 711                                   ") using external program"
 712                                   ;; Can non-string method ever happen?
 713                                   (if (stringp method)
 714                                       (concat
 715                                        " \"" (format method filename) "\"")
 716                                     "")
 717                                     "? "))))))
 718               (if external
 719                   (mm-display-external
 720                    handle (or method 'mailcap-save-binary-file))
 721                 (mm-display-external
 722                  handle 'mailcap-save-binary-file)))))))))
 723
 724 (defun mm-display-external (handle method)
 725   "Display HANDLE using METHOD."
 726   (let ((outbuf (current-buffer)))
 727     (mm-with-unibyte-buffer
 728       (if (functionp method)
 729           (let ((cur (current-buffer)))
 730             (if (eq method 'mailcap-save-binary-file)
 731                 (progn
 732                   (set-buffer (generate-new-buffer " *mm*"))
 733                   (setq method nil))
 734               (mm-insert-part handle)
 735               (let ((win (get-buffer-window cur t)))
 736                 (when win
 737                   (select-window win)))
 738               (switch-to-buffer (generate-new-buffer " *mm*")))
 739             (buffer-disable-undo)
 740             (mm-set-buffer-file-coding-system mm-binary-coding-system)
 741             (insert-buffer-substring cur)
 742             (goto-char (point-min))
 743             (when method
 744               (message "Viewing with %s" method))
 745             (let ((mm (current-buffer))
 746                   (non-viewer (assq 'non-viewer
 747                                     (mailcap-mime-info
 748                                      (mm-handle-media-type handle) t))))
 749               (unwind-protect
 750                   (if method
 751                       (funcall method)
 752                     (mm-save-part handle))
 753                 (when (and (not non-viewer)
 754                            method)
 755                   (mm-handle-set-undisplayer handle mm)))))
 756         ;; The function is a string to be executed.
 757         (mm-insert-part handle)
 758         (let* ((dir (mm-make-temp-file
 759                      (expand-file-name "emm." mm-tmp-directory) 'dir))
 760                (filename (or
 761                           (mail-content-type-get
 762                            (mm-handle-disposition handle) 'filename)
 763                           (mail-content-type-get
 764                            (mm-handle-type handle) 'name)))
 765                (mime-info (mailcap-mime-info
 766                            (mm-handle-media-type handle) t))
 767                (needsterm (or (assoc "needsterm" mime-info)
 768                               (assoc "needsterminal" mime-info)))
 769                (copiousoutput (assoc "copiousoutput" mime-info))
 770                file buffer)
 771           ;; We create a private sub-directory where we store our files.
 772           (set-file-modes dir 448)
 773           (if filename
 774               (setq file (expand-file-name
 775                           (gnus-map-function mm-file-name-rewrite-functions
 776                                              (file-name-nondirectory filename))
 777                           dir))
 778             ;; Use nametemplate (defined in RFC1524) if it is specified
 779             ;; in mailcap.
 780             (let ((suffix (cdr (assoc "nametemplate" mime-info))))
 781               (if (and suffix
 782                        (string-match "\\`%s\\(\\..+\\)\\'" suffix))
 783                   (setq suffix (match-string 1 suffix))
 784                 ;; Otherwise, use a suffix according to
 785                 ;; `mailcap-mime-extensions'.
 786                 (setq suffix (car (rassoc (mm-handle-media-type handle)
 787                                           mailcap-mime-extensions))))
 788               (setq file (mm-make-temp-file (expand-file-name "mm." dir)
 789                                             nil suffix))))
 790           (let ((coding-system-for-write mm-binary-coding-system))
 791             (write-region (point-min) (point-max) file nil 'nomesg))
 792           (message "Viewing with %s" method)
 793           (cond
 794            (needsterm
 795             (let ((command (mm-mailcap-command
 796                             method file (mm-handle-type handle))))
 797               (unwind-protect
 798                   (if window-system
 799                       (start-process "*display*" nil
 800                                      mm-external-terminal-program
 801                                      "-e" shell-file-name
 802                                      shell-command-switch command)
 803                     (require 'term)
 804                     (require 'gnus-win)
 805                     (set-buffer
 806                      (setq buffer
 807                            (make-term "display"
 808                                       shell-file-name
 809                                       nil
 810                                       shell-command-switch command)))
 811                     (term-mode)
 812                     (term-char-mode)
 813                     (set-process-sentinel
 814                      (get-buffer-process buffer)
 815                      `(lambda (process state)
 816                         (if (eq 'exit (process-status process))
 817                             (gnus-configure-windows
 818                              ',gnus-current-window-configuration))))
 819                     (gnus-configure-windows 'display-term))
 820                 (mm-handle-set-external-undisplayer handle (cons file buffer)))
 821               (message "Displaying %s..." command))
 822             'external)
 823            (copiousoutput
 824             (with-current-buffer outbuf
 825               (forward-line 1)
 826               (mm-insert-inline
 827                handle
 828                (unwind-protect
 829                    (progn
 830                      (call-process shell-file-name nil
 831                                    (setq buffer
 832                                          (generate-new-buffer " *mm*"))
 833                                    nil
 834                                    shell-command-switch
 835                                    (mm-mailcap-command
 836                                     method file (mm-handle-type handle)))
 837                      (if (buffer-live-p buffer)
 838                          (with-current-buffer buffer
 839                            (buffer-string))))
 840                  (progn
 841                    (ignore-errors (delete-file file))
 842                    (ignore-errors (delete-directory
 843                                    (file-name-directory file)))
 844                    (ignore-errors (kill-buffer buffer))))))
 845             'inline)
 846            (t
 847             ;; Deleting the temp file should be postponed for some wrappers,
 848             ;; shell scripts, and so on, which might exit right after having
 849             ;; started a viewer command as a background job.
 850             (let ((command (mm-mailcap-command
 851                             method file (mm-handle-type handle))))
 852               (unwind-protect
 853                   (progn
 854                     (start-process "*display*"
 855                                    (setq buffer
 856                                          (generate-new-buffer " *mm*"))
 857                                    shell-file-name
 858                                    shell-command-switch command)
 859                     (set-process-sentinel
 860                      (get-buffer-process buffer)
 861                      (lexical-let ;; Don't use `let'.
 862                          ;; Function used to remove temp file and directory.
 863                          ((fn `(lambda nil
 864                                  ;; Don't use `ignore-errors'.
 865                                  (condition-case nil
 866                                      (delete-file ,file)
 867                                    (error))
 868                                  (condition-case nil
 869                                      (delete-directory
 870                                       ,(file-name-directory file))
 871                                    (error))))
 872                           ;; Form uses to kill the process buffer and
 873                           ;; remove the undisplayer.
 874                           (fm `(progn
 875                                  (kill-buffer ,buffer)
 876                                  ,(macroexpand
 877                                    (list 'mm-handle-set-undisplayer
 878                                          (list 'quote handle)
 879                                          nil))))
 880                           ;; Message to be issued when the process exits.
 881                           (done (format "Displaying %s...done" command))
 882                           ;; In particular, the timer object (which is
 883                           ;; a vector in Emacs but is a list in XEmacs)
 884                           ;; requires that it is lexically scoped.
 885                           (timer (run-at-time 2.0 nil 'ignore)))
 886                        (if (boundp 'itimer-list)
 887                            (lambda (process state)
 888                              (when (eq 'exit (process-status process))
 889                                (if (memq timer itimer-list)
 890                                    (set-itimer-function timer fn)
 891                                  (funcall fn))
 892                                (ignore-errors (eval fm))
 893                                (message "%s" done)))
 894                          (lambda (process state)
 895                            (when (eq 'exit (process-status process))
 896                              (if (memq timer timer-list)
 897                                  (timer-set-function timer fn)
 898                                (funcall fn))
 899                              (ignore-errors (eval fm))
 900                              (message "%s" done)))))))
 901                 (mm-handle-set-external-undisplayer
 902                  handle (cons file buffer)))
 903               (message "Displaying %s..." command))
 904             'external)))))))
 905
 906 (defun mm-mailcap-command (method file type-list)
 907   (let ((ctl (cdr type-list))
 908         (beg 0)
 909         (uses-stdin t)
 910         out sub total)
 911     (while (string-match "%{\\([^}]+\\)}\\|'%s'\\|\"%s\"\\|%s\\|%t\\|%%"
 912                          method beg)
 913       (push (substring method beg (match-beginning 0)) out)
 914       (setq beg (match-end 0)
 915             total (match-string 0 method)
 916             sub (match-string 1 method))
 917       (cond
 918        ((string= total "%%")
 919         (push "%" out))
 920        ((or (string= total "%s")
 921             ;; We do our own quoting.
 922             (string= total "'%s'")
 923             (string= total "\"%s\""))
 924         (setq uses-stdin nil)
 925         (push (mm-quote-arg
 926                (gnus-map-function mm-path-name-rewrite-functions file)) out))
 927        ((string= total "%t")
 928         (push (mm-quote-arg (car type-list)) out))
 929        (t
 930         (push (mm-quote-arg (or (cdr (assq (intern sub) ctl)) "")) out))))
 931     (push (substring method beg (length method)) out)
 932     (when uses-stdin
 933       (push "<" out)
 934       (push (mm-quote-arg
 935              (gnus-map-function mm-path-name-rewrite-functions file))
 936             out))
 937     (mapconcat 'identity (nreverse out) "")))
 938
 939 (defun mm-remove-parts (handles)
 940   "Remove the displayed MIME parts represented by HANDLES."
 941   (if (and (listp handles)
 942            (bufferp (car handles)))
 943       (mm-remove-part handles)
 944     (let (handle)
 945       (while (setq handle (pop handles))
 946         (cond
 947          ((stringp handle)
 948           (when (buffer-live-p (get-text-property 0 'buffer handle))
 949             (kill-buffer (get-text-property 0 'buffer handle))))
 950          ((and (listp handle)
 951                (stringp (car handle)))
 952           (mm-remove-parts (cdr handle)))
 953          (t
 954           (mm-remove-part handle)))))))
 955
 956 (defun mm-destroy-parts (handles)
 957   "Remove the displayed MIME parts represented by HANDLES."
 958   (if (and (listp handles)
 959            (bufferp (car handles)))
 960       (mm-destroy-part handles)
 961     (let (handle)
 962       (while (setq handle (pop handles))
 963         (cond
 964          ((stringp handle)
 965           (when (buffer-live-p (get-text-property 0 'buffer handle))
 966             (kill-buffer (get-text-property 0 'buffer handle))))
 967          ((and (listp handle)
 968                (stringp (car handle)))
 969           (mm-destroy-parts handle))
 970          (t
 971           (mm-destroy-part handle)))))))
 972
 973 (defun mm-remove-part (handle)
 974   "Remove the displayed MIME part represented by HANDLE."
 975   (when (listp handle)
 976     (let ((object (mm-handle-undisplayer handle)))
 977       (ignore-errors
 978         (cond
 979          ;; Internally displayed part.
 980          ((mm-annotationp object)
 981           (delete-annotation object))
 982          ((or (functionp object)
 983               (and (listp object)
 984                    (eq (car object) 'lambda)))
 985           (funcall object))
 986          ;; Externally displayed part.
 987          ((consp object)
 988           (condition-case ()
 989               (while (get-buffer-process (cdr object))
 990                 (interrupt-process (get-buffer-process (cdr object)))
 991                 (message "Waiting for external displayer to die...")
 992                 (sit-for 1))
 993             (quit)
 994             (error))
 995           (ignore-errors (and (cdr object) (kill-buffer (cdr object))))
 996           (message "Waiting for external displayer to die...done")
 997           (ignore-errors (delete-file (car object)))
 998           (ignore-errors (delete-directory (file-name-directory
 999                                             (car object)))))
1000          ((bufferp object)
1001           (when (buffer-live-p object)
1002             (kill-buffer object)))))
1003       (mm-handle-set-undisplayer handle nil))))
1004
1005 (defun mm-display-inline (handle)
1006   (let* ((type (mm-handle-media-type handle))
1007          (function (cadr (mm-assoc-string-match mm-inline-media-tests type))))
1008     (funcall function handle)
1009     (goto-char (point-min))))
1010
1011 (defun mm-assoc-string-match (alist type)
1012   (dolist (elem alist)
1013     (when (string-match (car elem) type)
1014       (return elem))))
1015
1016 (defun mm-automatic-display-p (handle)
1017   "Say whether the user wants HANDLE to be displayed automatically."
1018   (let ((methods mm-automatic-display)
1019         (type (mm-handle-media-type handle))
1020         method result)
1021     (while (setq method (pop methods))
1022       (when (and (not (mm-inline-override-p handle))
1023                  (string-match method type))
1024         (setq result t
1025               methods nil)))
1026     result))
1027
1028 (defun mm-inlinable-p (handle &optional type)
1029   "Say whether HANDLE can be displayed inline.
1030 TYPE is the mime-type of the object; it defaults to the one given
1031 in HANDLE."
1032   (unless type (setq type (mm-handle-media-type handle)))
1033   (let ((alist mm-inline-media-tests)
1034         test)
1035     (while alist
1036       (when (string-match (caar alist) type)
1037         (setq test (caddar alist)
1038               alist nil)
1039         (setq test (funcall test handle)))
1040       (pop alist))
1041     test))
1042
1043 (defun mm-inlined-p (handle)
1044   "Say whether the user wants HANDLE to be displayed inline."
1045   (let ((methods mm-inlined-types)
1046         (type (mm-handle-media-type handle))
1047         method result)
1048     (while (setq method (pop methods))
1049       (when (and (not (mm-inline-override-p handle))
1050                  (string-match method type))
1051         (setq result t
1052               methods nil)))
1053     result))
1054
1055 (defun mm-attachment-override-p (handle)
1056   "Say whether HANDLE should have attachment behavior overridden."
1057   (let ((types mm-attachment-override-types)
1058         (type (mm-handle-media-type handle))
1059         ty)
1060     (catch 'found
1061       (while (setq ty (pop types))
1062         (when (and (string-match ty type)
1063                    (mm-inlinable-p handle))
1064           (throw 'found t))))))
1065
1066 (defun mm-inline-override-p (handle)
1067   "Say whether HANDLE should have inline behavior overridden."
1068   (let ((types mm-inline-override-types)
1069         (type (mm-handle-media-type handle))
1070         ty)
1071     (catch 'found
1072       (while (setq ty (pop types))
1073         (when (string-match ty type)
1074           (throw 'found t))))))
1075
1076 (defun mm-automatic-external-display-p (type)
1077   "Return the user-defined method for TYPE."
1078   (let ((methods mm-automatic-external-display)
1079         method result)
1080     (while (setq method (pop methods))
1081       (when (string-match method type)
1082         (setq result t
1083               methods nil)))
1084     result))
1085
1086 (defun mm-destroy-part (handle)
1087   "Destroy the data structures connected to HANDLE."
1088   (when (listp handle)
1089     (mm-remove-part handle)
1090     (when (buffer-live-p (mm-handle-buffer handle))
1091       (kill-buffer (mm-handle-buffer handle)))))
1092
1093 (defun mm-handle-displayed-p (handle)
1094   "Say whether HANDLE is displayed or not."
1095   (mm-handle-undisplayer handle))
1096
1097 ;;;
1098 ;;; Functions for outputting parts
1099 ;;;
1100
1101 (defmacro mm-with-part (handle &rest forms)
1102   "Run FORMS in the temp buffer containing the contents of HANDLE."
1103   `(let* ((handle ,handle)
1104           ;; The multibyteness of the temp buffer should be turned on
1105           ;; if inserting a multibyte string.  Contrarily, the buffer's
1106           ;; multibyteness should be off if inserting a unibyte string,
1107           ;; especially if a string contains 8bit data.
1108           (default-enable-multibyte-characters
1109             (with-current-buffer (mm-handle-buffer handle)
1110               (mm-multibyte-p))))
1111      (with-temp-buffer
1112        (insert-buffer-substring (mm-handle-buffer handle))
1113        (mm-disable-multibyte)
1114        (mm-decode-content-transfer-encoding
1115         (mm-handle-encoding handle)
1116         (mm-handle-media-type handle))
1117        ,@forms)))
1118 (put 'mm-with-part 'lisp-indent-function 1)
1119 (put 'mm-with-part 'edebug-form-spec '(body))
1120
1121 (defun mm-get-part (handle &optional no-cache)
1122   "Return the contents of HANDLE as a string.
1123 If NO-CACHE is non-nil, cached contents of a message/external-body part
1124 are ignored."
1125   (if (and (not no-cache)
1126            (equal (mm-handle-media-type handle) "message/external-body"))
1127       (progn
1128         (unless (mm-handle-cache handle)
1129           (mm-extern-cache-contents handle))
1130         (with-current-buffer (mm-handle-buffer (mm-handle-cache handle))
1131           (buffer-string)))
1132     (mm-with-part handle
1133       (buffer-string))))
1134
1135 (defun mm-insert-part (handle &optional no-cache)
1136   "Insert the contents of HANDLE in the current buffer.
1137 If NO-CACHE is non-nil, cached contents of a message/external-body part
1138 are ignored."
1139   (save-excursion
1140     (insert
1141      (cond ((eq (mail-content-type-get (mm-handle-type handle) 'charset)
1142                 'gnus-decoded)
1143             (with-current-buffer (mm-handle-buffer handle)
1144               (buffer-string)))
1145            ((mm-multibyte-p)
1146             (mm-string-to-multibyte (mm-get-part handle no-cache)))
1147            (t
1148             (mm-get-part handle no-cache))))))
1149
1150 (defun mm-file-name-delete-whitespace (file-name)
1151   "Remove all whitespace characters from FILE-NAME."
1152   (while (string-match "\\s-+" file-name)
1153     (setq file-name (replace-match "" t t file-name)))
1154   file-name)
1155
1156 (defun mm-file-name-trim-whitespace (file-name)
1157   "Remove leading and trailing whitespace characters from FILE-NAME."
1158   (when (string-match "\\`\\s-+" file-name)
1159     (setq file-name (substring file-name (match-end 0))))
1160   (when (string-match "\\s-+\\'" file-name)
1161     (setq file-name (substring file-name 0 (match-beginning 0))))
1162   file-name)
1163
1164 (defun mm-file-name-collapse-whitespace (file-name)
1165   "Collapse multiple whitespace characters in FILE-NAME."
1166   (while (string-match "\\s-\\s-+" file-name)
1167     (setq file-name (replace-match " " t t file-name)))
1168   file-name)
1169
1170 (defun mm-file-name-replace-whitespace (file-name)
1171   "Replace whitespace characters in FILE-NAME with underscores.
1172 Set the option `mm-file-name-replace-whitespace' to any other
1173 string if you do not like underscores."
1174   (let ((s (or mm-file-name-replace-whitespace "_")))
1175     (while (string-match "\\s-" file-name)
1176       (setq file-name (replace-match s t t file-name))))
1177   file-name)
1178
1179 (defun mm-file-name-delete-control (filename)
1180   "Delete control characters from FILENAME."
1181   (gnus-replace-in-string filename "[\x00-\x1f\x7f]" ""))
1182
1183 (defun mm-file-name-delete-gotchas (filename)
1184   "Delete shell gotchas from FILENAME."
1185   (setq filename (gnus-replace-in-string filename "[<>|]" ""))
1186   (gnus-replace-in-string filename "^[.-]+" ""))
1187
1188 (defun mm-save-part (handle)
1189   "Write HANDLE to a file."
1190   (let ((filename (or (mail-content-type-get
1191                        (mm-handle-disposition handle) 'filename)
1192                       (mail-content-type-get
1193                        (mm-handle-type handle) 'name)))
1194         file)
1195     (when filename
1196       (setq filename (gnus-map-function mm-file-name-rewrite-functions
1197                                         (file-name-nondirectory filename))))
1198     (setq file
1199           (mm-with-multibyte
1200            (read-file-name "Save MIME part to: "
1201                            (or mm-default-directory default-directory)
1202                            nil nil (or filename ""))))
1203     (setq mm-default-directory (file-name-directory file))
1204     (and (or (not (file-exists-p file))
1205              (yes-or-no-p (format "File %s already exists; overwrite? "
1206                                   file)))
1207          (progn
1208            (mm-save-part-to-file handle file)
1209            file))))
1210
1211 (defun mm-save-part-to-file (handle file)
1212   (mm-with-unibyte-buffer
1213     (mm-insert-part handle)
1214     (let ((coding-system-for-write 'binary)
1215           (current-file-modes (default-file-modes))
1216           ;; Don't re-compress .gz & al.  Arguably we should make
1217           ;; `file-name-handler-alist' nil, but that would chop
1218           ;; ange-ftp, which is reasonable to use here.
1219           (inhibit-file-name-operation 'write-region)
1220           (inhibit-file-name-handlers
1221            (cons 'jka-compr-handler inhibit-file-name-handlers)))
1222       (set-default-file-modes mm-attachment-file-modes)
1223       (unwind-protect
1224           (write-region (point-min) (point-max) file)
1225         (set-default-file-modes current-file-modes)))))
1226
1227 (defun mm-pipe-part (handle)
1228   "Pipe HANDLE to a process."
1229   (let* ((name (mail-content-type-get (mm-handle-type handle) 'name))
1230          (command
1231           (read-string "Shell command on MIME part: " mm-last-shell-command)))
1232     (mm-with-unibyte-buffer
1233       (mm-insert-part handle)
1234       (let ((coding-system-for-write 'binary))
1235         (shell-command-on-region (point-min) (point-max) command nil)))))
1236
1237 (defun mm-interactively-view-part (handle)
1238   "Display HANDLE using METHOD."
1239   (let* ((type (mm-handle-media-type handle))
1240          (methods
1241           (mapcar (lambda (i) (list (cdr (assoc 'viewer i))))
1242                   (mailcap-mime-info type 'all)))
1243          (method (let ((minibuffer-local-completion-map
1244                         mm-viewer-completion-map))
1245                    (completing-read "Viewer: " methods))))
1246     (when (string= method "")
1247       (error "No method given"))
1248     (if (string-match "^[^% \t]+$" method)
1249         (setq method (concat method " %s")))
1250     (mm-display-external handle method)))
1251
1252 (defun mm-preferred-alternative (handles &optional preferred)
1253   "Say which of HANDLES are preferred."
1254   (let ((prec (if preferred (list preferred)
1255                 (mm-preferred-alternative-precedence handles)))
1256         p h result type handle)
1257     (while (setq p (pop prec))
1258       (setq h handles)
1259       (while h
1260         (setq handle (car h))
1261         (setq type (mm-handle-media-type handle))
1262         (when (and (equal p type)
1263                    (mm-automatic-display-p handle)
1264                    (or (stringp (car handle))
1265                        (not (mm-handle-disposition handle))
1266                        (equal (car (mm-handle-disposition handle))
1267                               "inline")))
1268           (setq result handle
1269                 h nil
1270                 prec nil))
1271         (pop h)))
1272     result))
1273
1274 (defun mm-preferred-alternative-precedence (handles)
1275   "Return the precedence based on HANDLES and `mm-discouraged-alternatives'."
1276   (let ((seq (nreverse (mapcar #'mm-handle-media-type
1277                                handles))))
1278     (dolist (disc (reverse mm-discouraged-alternatives))
1279       (dolist (elem (copy-sequence seq))
1280         (when (string-match disc elem)
1281           (setq seq (nconc (delete elem seq) (list elem))))))
1282     seq))
1283
1284 (defun mm-get-content-id (id)
1285   "Return the handle(s) referred to by ID."
1286   (cdr (assoc id mm-content-id-alist)))
1287
1288 (defconst mm-image-type-regexps
1289   '(("/\\*.*XPM.\\*/" . xpm)
1290     ("P[1-6]" . pbm)
1291     ("GIF8" . gif)
1292     ("\377\330" . jpeg)
1293     ("\211PNG\r\n" . png)
1294     ("#define" . xbm)
1295     ("\\(MM\0\\*\\)\\|\\(II\\*\0\\)" . tiff)
1296     ("%!PS" . postscript))
1297   "Alist of (REGEXP . IMAGE-TYPE) pairs used to auto-detect image types.
1298 When the first bytes of an image file match REGEXP, it is assumed to
1299 be of image type IMAGE-TYPE.")
1300
1301 ;; Steal from image.el. image-type-from-data suffers multi-line matching bug.
1302 (defun mm-image-type-from-buffer ()
1303   "Determine the image type from data in the current buffer.
1304 Value is a symbol specifying the image type or nil if type cannot
1305 be determined."
1306   (let ((types mm-image-type-regexps)
1307         type)
1308     (goto-char (point-min))
1309     (while (and types (null type))
1310       (let ((regexp (car (car types)))
1311             (image-type (cdr (car types))))
1312         (when (looking-at regexp)
1313           (setq type image-type))
1314         (setq types (cdr types))))
1315     type))
1316
1317 (defun mm-get-image (handle)
1318   "Return an image instance based on HANDLE."
1319   (let ((type (mm-handle-media-subtype handle))
1320         spec)
1321     ;; Allow some common translations.
1322     (setq type
1323           (cond
1324            ((equal type "x-pixmap")
1325             "xpm")
1326            ((equal type "x-xbitmap")
1327             "xbm")
1328            ((equal type "x-portable-bitmap")
1329             "pbm")
1330            (t type)))
1331     (or (mm-handle-cache handle)
1332         (mm-with-unibyte-buffer
1333           (mm-insert-part handle)
1334           (prog1
1335               (setq spec
1336                     (ignore-errors
1337                       ;; Avoid testing `make-glyph' since W3 may define
1338                       ;; a bogus version of it.
1339                       (if (fboundp 'create-image)
1340                           (create-image (buffer-string)
1341                                         (or (mm-image-type-from-buffer)
1342                                             (intern type))
1343                                         'data-p)
1344                         (mm-create-image-xemacs type))))
1345             (mm-handle-set-cache handle spec))))))
1346
1347 (defun mm-create-image-xemacs (type)
1348   (cond
1349    ((equal type "xbm")
1350     ;; xbm images require special handling, since
1351     ;; the only way to create glyphs from these
1352     ;; (without a ton of work) is to write them
1353     ;; out to a file, and then create a file
1354     ;; specifier.
1355     (let ((file (mm-make-temp-file
1356                  (expand-file-name "emm" mm-tmp-directory)
1357                  nil ".xbm")))
1358       (unwind-protect
1359           (progn
1360             (write-region (point-min) (point-max) file)
1361             (make-glyph (list (cons 'x file))))
1362         (ignore-errors
1363           (delete-file file)))))
1364    (t
1365     (make-glyph
1366      (vector
1367       (or (mm-image-type-from-buffer)
1368           (intern type))
1369       :data (buffer-string))))))
1370
1371 (defun mm-image-fit-p (handle)
1372   "Say whether the image in HANDLE will fit the current window."
1373   (let ((image (mm-get-image handle)))
1374     (or (not image)
1375         (if (fboundp 'glyph-width)
1376             ;; XEmacs' glyphs can actually tell us about their width, so
1377             ;; lets be nice and smart about them.
1378             (or mm-inline-large-images
1379                 (and (<= (glyph-width image) (window-pixel-width))
1380                      (<= (glyph-height image) (window-pixel-height))))
1381           (let* ((size (image-size image))
1382                  (w (car size))
1383                  (h (cdr size)))
1384             (or mm-inline-large-images
1385                 (and (<= h (1- (window-height))) ; Don't include mode line.
1386                      (<= w (window-width)))))))))
1387
1388 (defun mm-valid-image-format-p (format)
1389   "Say whether FORMAT can be displayed natively by Emacs."
1390   (cond
1391    ;; Handle XEmacs
1392    ((fboundp 'valid-image-instantiator-format-p)
1393     (valid-image-instantiator-format-p format))
1394    ;; Handle Emacs 21
1395    ((fboundp 'image-type-available-p)
1396     (and (display-graphic-p)
1397          (image-type-available-p format)))
1398    ;; Nobody else can do images yet.
1399    (t
1400     nil)))
1401
1402 (defun mm-valid-and-fit-image-p (format handle)
1403   "Say whether FORMAT can be displayed natively and HANDLE fits the window."
1404   (and (mm-valid-image-format-p format)
1405        (mm-image-fit-p handle)))
1406
1407 (defun mm-find-part-by-type (handles type &optional notp recursive)
1408   "Search in HANDLES for part with TYPE.
1409 If NOTP, returns first non-matching part.
1410 If RECURSIVE, search recursively."
1411   (let (handle)
1412     (while handles
1413       (if (and recursive (stringp (caar handles)))
1414           (if (setq handle (mm-find-part-by-type (cdar handles) type
1415                                                  notp recursive))
1416               (setq handles nil))
1417         (if (if notp
1418                 (not (equal (mm-handle-media-type (car handles)) type))
1419               (equal (mm-handle-media-type (car handles)) type))
1420             (setq handle (car handles)
1421                   handles nil)))
1422       (setq handles (cdr handles)))
1423     handle))
1424
1425 (defun mm-find-raw-part-by-type (ctl type &optional notp)
1426   (goto-char (point-min))
1427   (let* ((boundary (concat "--" (mm-handle-multipart-ctl-parameter ctl
1428                                                                    'boundary)))
1429          (close-delimiter (concat "^" (regexp-quote boundary) "--[ \t]*$"))
1430          start
1431          (end (save-excursion
1432                 (goto-char (point-max))
1433                 (if (re-search-backward close-delimiter nil t)
1434                     (match-beginning 0)
1435                   (point-max))))
1436          result)
1437     (setq boundary (concat "^" (regexp-quote boundary) "[ \t]*$"))
1438     (while (and (not result)
1439                 (re-search-forward boundary end t))
1440       (goto-char (match-beginning 0))
1441       (when start
1442         (save-excursion
1443           (save-restriction
1444             (narrow-to-region start (1- (point)))
1445             (when (let* ((ct (mail-fetch-field "content-type"))
1446                          (ctl (and ct (mail-header-parse-content-type ct))))
1447                     (if notp
1448                         (not (equal (car ctl) type))
1449                       (equal (car ctl) type)))
1450               (setq result (buffer-string))))))
1451       (forward-line 1)
1452       (setq start (point)))
1453     (when (and (not result) start)
1454       (save-excursion
1455         (save-restriction
1456           (narrow-to-region start end)
1457           (when (let* ((ct (mail-fetch-field "content-type"))
1458                        (ctl (and ct (mail-header-parse-content-type ct))))
1459                   (if notp
1460                       (not (equal (car ctl) type))
1461                     (equal (car ctl) type)))
1462             (setq result (buffer-string))))))
1463     result))
1464
1465 (defvar mm-security-handle nil)
1466
1467 (defsubst mm-set-handle-multipart-parameter (handle parameter value)
1468   ;; HANDLE could be a CTL.
1469   (when handle
1470     (put-text-property 0 (length (car handle)) parameter value
1471                        (car handle))))
1472
1473 (defun mm-possibly-verify-or-decrypt (parts ctl)
1474   (let ((type (car ctl))
1475         (subtype (cadr (split-string (car ctl) "/")))
1476         (mm-security-handle ctl) ;; (car CTL) is the type.
1477         protocol func functest)
1478     (cond
1479      ((or (equal type "application/x-pkcs7-mime")
1480           (equal type "application/pkcs7-mime"))
1481       (with-temp-buffer
1482         (when (and (cond
1483                     ((eq mm-decrypt-option 'never) nil)
1484                     ((eq mm-decrypt-option 'always) t)
1485                     ((eq mm-decrypt-option 'known) t)
1486                     (t (y-or-n-p
1487                         (format "Decrypt (S/MIME) part? "))))
1488                    (mm-view-pkcs7 parts))
1489           (setq parts (mm-dissect-buffer t)))))
1490      ((equal subtype "signed")
1491       (unless (and (setq protocol
1492                          (mm-handle-multipart-ctl-parameter ctl 'protocol))
1493                    (not (equal protocol "multipart/mixed")))
1494         ;; The message is broken or draft-ietf-openpgp-multsig-01.
1495         (let ((protocols mm-verify-function-alist))
1496           (while protocols
1497             (if (and (or (not (setq functest (nth 3 (car protocols))))
1498                          (funcall functest parts ctl))
1499                      (mm-find-part-by-type parts (caar protocols) nil t))
1500                 (setq protocol (caar protocols)
1501                       protocols nil)
1502               (setq protocols (cdr protocols))))))
1503       (setq func (nth 1 (assoc protocol mm-verify-function-alist)))
1504       (when (cond
1505              ((eq mm-verify-option 'never) nil)
1506              ((eq mm-verify-option 'always) t)
1507              ((eq mm-verify-option 'known)
1508               (and func
1509                    (or (not (setq functest
1510                                   (nth 3 (assoc protocol
1511                                                 mm-verify-function-alist))))
1512                        (funcall functest parts ctl))))
1513              (t
1514               (y-or-n-p
1515                (format "Verify signed (%s) part? "
1516                        (or (nth 2 (assoc protocol mm-verify-function-alist))
1517                            (format "protocol=%s" protocol))))))
1518         (save-excursion
1519           (if func
1520               (funcall func parts ctl)
1521             (mm-set-handle-multipart-parameter
1522              mm-security-handle 'gnus-details
1523              (format "Unknown sign protocol (%s)" protocol))))))
1524      ((equal subtype "encrypted")
1525       (unless (setq protocol
1526                     (mm-handle-multipart-ctl-parameter ctl 'protocol))
1527         ;; The message is broken.
1528         (let ((parts parts))
1529           (while parts
1530             (if (assoc (mm-handle-media-type (car parts))
1531                        mm-decrypt-function-alist)
1532                 (setq protocol (mm-handle-media-type (car parts))
1533                       parts nil)
1534               (setq parts (cdr parts))))))
1535       (setq func (nth 1 (assoc protocol mm-decrypt-function-alist)))
1536       (when (cond
1537              ((eq mm-decrypt-option 'never) nil)
1538              ((eq mm-decrypt-option 'always) t)
1539              ((eq mm-decrypt-option 'known)
1540               (and func
1541                    (or (not (setq functest
1542                                   (nth 3 (assoc protocol
1543                                                 mm-decrypt-function-alist))))
1544                        (funcall functest parts ctl))))
1545              (t
1546               (y-or-n-p
1547                (format "Decrypt (%s) part? "
1548                        (or (nth 2 (assoc protocol mm-decrypt-function-alist))
1549                            (format "protocol=%s" protocol))))))
1550         (save-excursion
1551           (if func
1552               (setq parts (funcall func parts ctl))
1553             (mm-set-handle-multipart-parameter
1554              mm-security-handle 'gnus-details
1555              (format "Unknown encrypt protocol (%s)" protocol))))))
1556      (t nil))
1557     parts))
1558
1559 (defun mm-multiple-handles (handles)
1560   (and (listp handles)
1561        (> (length handles) 1)
1562        (or (listp (car handles))
1563            (stringp (car handles)))))
1564
1565 (defun mm-complicated-handles (handles)
1566   (and (listp (car handles))
1567        (> (length handles) 1)))
1568
1569 (defun mm-merge-handles (handles1 handles2)
1570   (append
1571    (if (listp (car handles1))
1572        handles1
1573      (list handles1))
1574    (if (listp (car handles2))
1575        handles2
1576      (list handles2))))
1577
1578 (defun mm-readable-p (handle)
1579   "Say whether the content of HANDLE is readable."
1580   (and (< (with-current-buffer (mm-handle-buffer handle)
1581             (buffer-size)) 10000)
1582        (mm-with-unibyte-buffer
1583          (mm-insert-part handle)
1584          (and (eq (mm-body-7-or-8) '7bit)
1585               (not (mm-long-lines-p 76))))))
1586
1587 (provide 'mm-decode)
1588
1589 ;; arch-tag: 4f35d360-56b8-4030-9388-3ed82d359b9b
1590 ;;; mm-decode.el ends here