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mew-encode.el
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mew-encode.el
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;;; mew-encode.el --- MIME syntax encoder for Mew
;; Author: Kazu Yamamoto <Kazu@Mew.org>
;; Created: Oct 2, 1996
;;; Code:
(require 'mew)
(defvar mew-prog-mime-encode-switch
`((,mew-b64 "-b")
(,mew-qp "-q")
(,mew-xg "-g")))
(defvar mew-prog-mime-encode-text-switch
`((,mew-b64 "-b" "-t")
(,mew-qp "-q")
(,mew-xg "-g""-t")))
(defun mew-prog-mime-encode-get-opt (cte switch)
(cdr (mew-assoc-case-equal cte switch 0)))
(defvar mew-encode-multipart-encrypted-switch
`((,mew-ct-pge mew-pgp-encrypt)))
(defvar mew-encode-multipart-signed-switch
`((,mew-ct-pgs mew-pgp-sign mew-pgp-canonicalize)
(,mew-ct-sms mew-smime-detach-sign)))
;;
(defun mew-encode-get-security-func (proto switch)
(nth 1 (mew-assoc-case-equal proto switch 0)))
(defun mew-encode-get-canonicalize-func (proto switch)
(nth 2 (mew-assoc-case-equal proto switch 0)))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;
;;; MIME encoder
;;;
(defun mew-encode-error (error-msg)
(mew-tinfo-set-encode-err error-msg)
(error ""))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;
;;; RFC 2822 comments
;;;
;; RFC 2822 defines the limitations of the number of fields.
;;
;; * Overriding
;; Date: (exactly once)
;; Message-Id:
;;
;; * Put multiple fields to a single field
;; From: (exactly once)
;; Reply-To:
;; To:
;; Cc:
;;
;; * Error and undo
;; Sender: (if exist, exactly one address)
;;
;; In-Reply-To:
;; References:
;; Subject:
;;
(defconst mew-multiple-field-error-list
(list mew-subj: mew-in-reply-to: mew-references:))
(defconst mew-multiple-field-combine-list
(list mew-from: mew-reply-to: mew-to: mew-cc:))
(defun mew-header-count-field (field)
(let ((case-fold-search t)
(regex (format "^%s" field))
(i 0))
(goto-char (point-min))
(while (re-search-forward regex nil t)
(setq i (1+ i))
(forward-line))
i))
(defun mew-header-combine-field (field)
(let ((case-fold-search t)
(regex (format "^%s" field))
beg med here value)
(goto-char (point-min))
(when (re-search-forward regex nil t)
(forward-line)
(mew-header-goto-next)
(setq here (1- (point)))
(while (re-search-forward regex nil t)
(setq beg (match-beginning 0))
(setq med (match-end 0))
(forward-line)
(mew-header-goto-next)
(setq value (mew-buffer-substring med (1- (point))))
(delete-region beg (point))
(save-excursion
(goto-char here)
(insert ",\n\t" value)
(setq here (point)))))))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;
;;; Header sanity check
;;;
(defun mew-encode-remove-invalid-fields ()
(when (mew-header-end)
(save-excursion
(save-restriction
(narrow-to-region (point-min) (mew-header-end))
(dolist (field mew-multiple-field-error-list)
(if (> (mew-header-count-field field) 1)
(mew-encode-error (format "Multiple %s!" field))))
(mapcar 'mew-header-combine-field mew-multiple-field-combine-list)))))
(defun mew-encode-ask-subject ()
(when (and mew-ask-subject (not (mew-header-existp mew-subj:)))
;; Subject: does not exist
(let ((subj (read-string (concat mew-subj: " "))))
(mew-header-replace-value mew-subj: subj))))
(defun mew-encode-fcc-folder-check (fld)
(let ((folder (mew-canonicalize-folder fld)))
(when (and mew-ask-fcc
(mew-folder-localp folder)
(not (file-directory-p (mew-expand-folder folder))))
(if (y-or-n-p (format "%s does not exist. Create it? " folder))
(mew-local-folder-check folder)
(mew-encode-error "Edit Fcc:")))
folder))
(defun mew-encode-ask-fcc (resentp)
(let* ((target (if resentp mew-resent-fcc: mew-fcc:))
(folders (mew-header-get-value target)))
(when folders
(mapcar
'mew-encode-fcc-folder-check
(mew-addrstr-parse-value-list2 folders)))))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;
;;; To:, Cc:
;;;
(defvar mew-draft-append-domain-p t)
(defun mew-draft-append-domain (addr)
(if (string-match "@" addr)
addr
(if mew-draft-append-domain-p
(concat addr "@" (mew-mail-domain (mew-tinfo-get-case)))
(throw 'jump addr))))
(defun mew-encode-canonicalize-address (resentp)
(catch 'jump
(let ((case-fold-search t)
(regex (mew-make-field-regex
(if resentp mew-resent-dest:-list mew-destination:-list)))
key start vals val addrs addr ret insl ins prefix suffix)
(save-excursion
(save-restriction
(narrow-to-region (point-min) (mew-header-end))
(goto-char (point-min))
(while (re-search-forward regex nil t)
(setq key (match-string 1))
(setq start (match-end 0))
(forward-line)
(while (looking-at mew-lwsp)
(delete-char -1)
(forward-line))
(setq val (mew-buffer-substring start (1- (point))))
(delete-region start (1- (point)))
(backward-char 1)
;; single quote is allowed for local-part
(setq vals (mapcar 'mew-chop (mew-split-quoted val ?, ?: ?\; 'no-single)))
(dolist (val vals)
(setq ins nil addrs nil)
(cond
;; phrase:addr1,addr2;
((string-match "[^:]+:[^;]+;" val)
(let ((mew-alias-expand-prefix nil))
(setq addrs (mew-alias-expand val mew-addrbook-alist 0))
(setq addrs (mapcar 'mew-draft-append-domain addrs))
(setq ins (list (concat mew-alias-expand-prefix ":;")))))
;; Name <addr>
((and (setq addr (mew-addrstr-parse-address val))
(string-match (concat "\\(.*<\\)" (regexp-quote addr) "\\(>.*\\)")
val))
(setq prefix (match-string 1 val))
(setq suffix (match-string 2 val))
(setq addr (mew-draft-append-domain addr))
(setq addrs (list addr))
(setq ins (list (concat prefix addr suffix))))
;; addr
(t
(let ((mew-alias-expand-prefix nil))
(setq addrs (mew-alias-expand val mew-addrbook-alist 0))
(setq addrs (mapcar 'mew-draft-append-domain addrs))
(if mew-alias-expand-prefix
(setq ins (list (concat mew-alias-expand-prefix ":;")))
(setq ins (copy-sequence addrs))))))
(setq insl (nconc insl ins))
(unless (string-match "bcc" key) ;; Removing Bcc:
(setq ret (nconc ret addrs)))) ;; end of dolist
(insert " " (mapconcat 'identity insl ", "))
(setq insl nil)
(forward-line))))
ret)))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;
;;; Dcc:, Bcc:
;;;
(defun mew-encode-delete-dcc (resentp)
(let* ((target (list (if resentp mew-resent-dcc: mew-dcc:)))
(dcc (mew-header-parse-address-list target)))
;; Dcc: is already contained in recipients.
;; So, just delete it.
;; Delete {Resent-,}Dcc: anyway.
(mew-header-delete-lines (list mew-dcc: mew-resent-dcc:))
dcc))
(defun mew-encode-delete-bcc (resentp)
(let* ((target (list (if resentp mew-resent-bcc: mew-bcc:)))
(bcc (mew-header-parse-address-list target)))
(mew-header-delete-lines (list mew-bcc: mew-resent-bcc:)) ;; anyway
bcc))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;
;;; Message-Id:, Date:
;;;
(defun mew-encode-id-date (_pnm msgid &optional resentp)
(let ((time (current-time)))
(cond
(resentp
(mew-header-delete-lines (list mew-resent-date: mew-resent-message-id:))
(save-excursion
(goto-char (point-min))
(mew-header-insert mew-resent-date: (mew-time-ctz-to-rfc time))
(mew-header-insert mew-resent-message-id: msgid)))
(t
(mew-header-delete-lines (list mew-date: mew-message-id:))
(save-excursion
(goto-char (point-min))
(mew-header-insert mew-date: (mew-time-ctz-to-rfc time))
(mew-header-insert mew-message-id: msgid))))
(list msgid (mew-time-ctz-to-logtime time))))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;
;;; From:, Sender:
;;;
(defun mew-encode-check-sender (resentp)
(if (< 1 (length (mew-addrstr-parse-address-list
(mew-header-get-value
(if resentp mew-resent-sender: mew-sender:)))))
(mew-encode-error "Sender: must contain one address!")))
(defun mew-encode-from (case resentp)
(unless (mew-header-existp mew-from:)
(let ((from (mew-from case)))
(save-excursion
(goto-char (point-min))
(if resentp
(mew-header-insert mew-resent-from: from)
(mew-header-insert mew-from: from))))))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;
;;; Learning aliases
;;;
;; xxx Bcc: and/or Dcc:?
(defun mew-encode-learn-aliases (resentp)
(if (and mew-use-auto-alias mew-addrbook-append-domain-p)
;; If mew-addrbook-append-domain-p is nil, automatic
;; short names would be conflicted to local users.
(mapcar 'mew-addrbook-alias-add
(mew-header-parse-address-list
(if resentp
(list mew-resent-to: mew-resent-cc:)
(list mew-to: mew-cc:))))))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;
;;; Misc
;;;
(defun mew-encode-set-privacy (pnm privacy case)
(unless (or (mew-syntax-get-privacy mew-encode-syntax) ;; specified
;; encryption previously failed, so bypass.
(and (null privacy) (mew-tinfo-get-privacy-err)))
(let (type)
(cond
(privacy
(setq type privacy))
((mew-tinfo-get-privacy-type)
(setq type (mew-tinfo-get-privacy-type)))
((and (mew-tinfo-get-encrypted-p) (mew-protect-privacy-encrypted case))
(setq type (mew-protect-privacy-encrypted-type case)))
((mew-protect-privacy-always case)
(setq type (mew-protect-privacy-always-type case))))
(mew-syntax-set-privacy
mew-encode-syntax
(mew-pcdb-ct (mew-pcdb-by-service type)))
;; recipients are ignored when signing
(mew-syntax-set-decrypters
mew-encode-syntax (mew-smtp-get-recipients pnm)))))
(defun mew-encode-make-header (&optional addsep resentp)
(unless (mew-header-existp mew-mv:)
(goto-char (mew-header-end))
(mew-header-insert mew-mv: mew-mv:-num))
(mew-header-encode-region (point-min) (mew-header-end) resentp)
(cond
(addsep ;; reedit
;; To:
;; Content-*
;; ----
(mew-header-clear) ;; mew-in-header-p() returns nil
;; To:
;; Content-*
(insert "\n"))
(t
;; To:
;; ----
;; Content-*
(mew-header-clear) ;; mew-in-header-p returns nil
;; To:
;; Content-*
))
(mew-header-goto-end)
(mew-highlight-header-region (point-min) (point)))
(defun mew-encode-save-draft ()
(mew-frwlet mew-cs-dummy mew-cs-text-for-write
(write-region (point-min) (point-max) (buffer-file-name) nil 'no-msg)
(clear-visited-file-modtime)
(mew-delete-file buffer-auto-save-file-name)
(set-buffer-modified-p nil)))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;
;;; Encoding a message
;;;
(defun mew-smtp-encode (pnm case resentp fcc &optional privacy signer headerp)
(let ((ret t))
(if (mew-debug 'encode)
(let ((debug-on-error t))
(mew-smtp-encode-message pnm case resentp fcc privacy signer headerp))
(condition-case nil
(mew-smtp-encode-message pnm case resentp fcc privacy signer headerp)
(error
(mew-encode-undo)
(message "%s" (mew-tinfo-get-encode-err))
(setq ret nil))
(quit
(mew-encode-undo)
(message "quit")
(setq ret nil))))
ret))
(defun mew-smtp-encode-message (pnm case resentp fcc &optional privacy signer headerp)
(mew-set-buffer-multibyte t)
(if (buffer-modified-p) (save-buffer)) ;; to make backup
(widen)
(let (multip recipients msgid logtime)
(mew-smtp-set-raw-header
pnm (mew-buffer-substring (point-min) (mew-header-end)))
(unless headerp
;; Let's backup
(if (mew-attach-p)
(progn
(setq multip t)
(mew-attach-clear))
(unless mew-encode-syntax
(setq mew-encode-syntax
(mew-encode-syntax-single "text.txt" (list mew-ct-txt)))))
(mew-encode-make-backup))
;; Errors can be caused from here.
(goto-char (point-min))
(mew-encode-remove-invalid-fields)
;; Destination check
(setq recipients (mew-encode-canonicalize-address resentp))
;; Bcc: is not included.
(mew-smtp-set-recipients pnm recipients)
(mew-smtp-set-orig-recipients pnm recipients)
(cond
((null recipients)
(mew-encode-error "No recipient!"))
((stringp recipients)
(mew-encode-error (format "'%s' is not in the right form!" recipients))))
;; Header modifications which are not remained.
(mew-header-delete-lines (list mew-fcc: mew-resent-fcc:)) ;; anyway
(mew-encode-delete-dcc resentp)
(mew-smtp-set-bcc pnm (mew-encode-delete-bcc resentp))
(mew-smtp-set-fcc pnm fcc)
;;
(mew-encode-check-sender resentp)
(mew-encode-from case resentp)
;;
(mew-set '(msgid logtime) (mew-encode-id-date pnm (mew-smtp-message-id case) resentp))
(mew-smtp-set-msgid pnm msgid)
(mew-smtp-set-logtime pnm logtime)
;;
(goto-char (mew-header-end))
(forward-line) ;; necessary for PGP
;;
(message "Making a message...")
;; save syntax before setting privacy
(unless headerp
(mew-encode-set-privacy pnm privacy case)
(let (mew-inherit-encode-pgp-signer
mew-inherit-encode-smime-signer)
(setq mew-inherit-encode-pgp-signer
(or signer
(mew-pgp-signer (mew-tinfo-get-case))
(mew-get-my-address)))
(setq mew-inherit-encode-smime-signer
(or signer
(mew-smime-signer (mew-tinfo-get-case))
(mew-get-my-address)))
(goto-char (mew-header-end)) ;; due to invalid null lines in the header
(forward-line)
(if multip
(mew-encode-make-multi)
(mew-encode-make-single))))
(mew-encode-make-header headerp resentp)
;; Learn aliases after no error occurred
(mew-encode-learn-aliases resentp)
(mew-encode-save-draft)
(mew-overlay-delete-buffer)
(message "Making a message...done")))
(defun mew-nntp2-encode (pnm case fcc &optional privacy signer headerp)
(let ((ret t))
(if (mew-debug 'encode)
(let ((debug-on-error t))
(mew-nntp2-encode-message pnm case fcc privacy signer headerp))
(condition-case nil
(mew-nntp2-encode-message pnm case fcc privacy signer headerp)
(error
(mew-encode-undo)
(message "%s" (mew-tinfo-get-encode-err))
(setq ret nil))
(quit
(mew-encode-undo)
(message "quit")
(setq ret nil))))
ret))
(defun mew-nntp2-encode-message (pnm case fcc &optional privacy signer headerp)
(mew-set-buffer-multibyte t)
(if (buffer-modified-p) (save-buffer)) ;; to make backup
(widen)
(let (multip newsgroups msgid logtime)
(mew-nntp2-set-raw-header
pnm (mew-buffer-substring (point-min) (mew-header-end)))
;; Let's backup
(unless headerp
(if (mew-attach-p)
(progn
(setq multip t)
(mew-attach-clear))
(setq mew-encode-syntax
(mew-encode-syntax-single "text.txt" (list mew-ct-txt))))
(mew-encode-make-backup))
;; Errors can be caused from here.
(goto-char (point-min))
(mew-encode-remove-invalid-fields)
;; Newsgroups check
(setq newsgroups (mew-header-get-value mew-newsgroups:))
(mew-nntp2-set-newsgroups pnm newsgroups)
(unless newsgroups (mew-encode-error "No newsgroups!"))
;; Header modifications which are not remained.
(mew-header-delete-lines (list mew-fcc: mew-resent-fcc:)) ;; anyway
(mew-nntp2-set-fcc pnm fcc)
;;
(mew-encode-from case nil)
;;
(mew-set '(msgid logtime) (mew-encode-id-date pnm (mew-nntp-message-id case)))
(mew-nntp2-set-msgid pnm msgid)
(mew-nntp2-set-logtime pnm logtime)
;;
(goto-char (mew-header-end))
(forward-line) ;; necessary for PGP
;;
(message "Making a message...")
;; save syntax before setting privacy
(unless headerp
(mew-encode-set-privacy pnm privacy case)
(let (mew-inherit-encode-pgp-signer
mew-inherit-encode-smime-signer)
(setq mew-inherit-encode-pgp-signer
(or signer
(mew-pgp-signer (mew-tinfo-get-case))
(mew-get-my-address)))
(setq mew-inherit-encode-smime-signer
(or signer
(mew-smime-signer (mew-tinfo-get-case))
(mew-get-my-address)))
(goto-char (mew-header-end)) ;; due to invalid null lines in the header
(forward-line)
(if multip
(mew-encode-make-multi)
(mew-encode-make-single))))
(mew-encode-make-header nil)
(mew-encode-save-draft)
(mew-overlay-delete-buffer)
(message "Making a message...done")))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;
;;; Encoding singlepart
;;;
(defun mew-encode-make-single ()
;; Just after the header
;; Using Multipart/Signed if the body is a single part.
(if (equal (mew-syntax-get-privacy mew-encode-syntax)
`((,mew-ct-smm ,mew-ct-smm-sig)))
(mew-syntax-set-privacy mew-encode-syntax `((,mew-ct-mls ,mew-ct-sms))))
(mew-encode-singlepart mew-encode-syntax nil nil t 'cover))
(defun mew-encode-charset-8bitp (charset)
(let ((case-fold-search t))
(if (or (mew-case-equal mew-us-ascii charset)
(string-match "^iso-2022" charset))
nil
t)))
(defun mew-encode-file-8bitp (file)
(if (and (mew-which-exec mew-prog-8bit) (file-readable-p file))
(eq (call-process mew-prog-8bit file nil nil "-8") 1)))
(defun mew-encode-limit-7bitp (privacy)
;; Only parts to be signed FIRST are limited to 7bit.
(and privacy (mew-case-equal mew-ct-mls (car (car privacy)))))
(defvar mew-encode-max-line-length 990)
;; RFC 2822 defines 1000 but Sendmail uses 990
(defvar mew-ask-encoding t)
(defvar mew-default-encoding mew-b64)
(defvar mew-draft-keep-text-charset nil)
(defun mew-encode-mime-body (ctl cte file no-encoding)
;; If file is 't', target is buffered.
;; text should be buffered
;; - specified charset is a rare case
;; - copy overhead may be small
(let* ((ct (mew-syntax-get-value ctl 'cap))
(textp (mew-ct-textp ct))
(charset (if textp (mew-syntax-get-param ctl "charset")))
(icharset (if textp (mew-syntax-get-param ctl "icharset")))
(linebasep (or textp (mew-ct-linebasep ct)))
(switch (if linebasep
mew-prog-mime-encode-text-switch
mew-prog-mime-encode-switch))
(beg (point))
buffer cs opt last flowed delsp flowed-delsp)
(if (and (stringp file)
(setq buffer (get-file-buffer file))
(buffer-modified-p buffer))
(with-current-buffer buffer
(save-buffer)))
(when textp
(when (and (stringp file) (file-readable-p file))
(when icharset
(setq cs (mew-charset-to-cs icharset))
(unless (mew-coding-system-p cs)
(mew-encode-error
(format "Unknown coding system %s in the body"
(symbol-name cs)))))
;; If a user want to keep text charset,
(when (and mew-draft-keep-text-charset (null charset))
(let ((cs (mew-cs-strip-lineinfo
(mew-file-guess-coding-system file))))
(if cs (setq charset (mew-cs-to-charset cs)))))
(mew-frwlet (or cs mew-cs-autoconv) mew-cs-dummy
(mew-insert-file-contents file)))
;; A user may specify charset to convey JIS X 0201 Katakana.
;; So, we need to avoid the sanity check.
(unless charset
(if mew-use-charset-sanity-check
(mew-charset-sanity-check beg (point-max)))
(setq charset (mew-charset-guess-region beg (point-max))))
(setq cs (mew-charset-to-cs charset))
(when (string= mew-ct-txt ct)
(cond
((mew-tinfo-get-flowed)
(setq flowed t)
(if (string= (mew-tinfo-get-flowed) "yes")
(setq delsp t)))
((mew-tinfo-get-use-flowed)
(setq flowed-delsp (mew-encode-flowed beg (point-max) charset))
(mew-set '(flowed delsp) flowed-delsp))))
(unless (mew-coding-system-p cs)
(mew-encode-error
(format "Unknown coding system %s in the body" (symbol-name cs))))
(mew-cs-encode-region beg (point-max) cs))
;; decide cte
(cond
(textp
(cond
((and cte (or (mew-case-equal cte mew-b64) (mew-case-equal cte mew-qp)))
;; user specified and in 7bit domain, so do nothing.
)
(t
(if (or (null cte) (mew-case-equal cte mew-bin))
;; retain the user-specified cte
(setq cte (mew-charset-to-cte charset)))
(if (or (null cte) (mew-case-equal cte mew-bin))
;; unknown charset
(setq cte mew-default-encoding))
(cond
(no-encoding
(if (mew-encode-charset-8bitp charset)
(setq cte mew-8bit)
(setq cte mew-7bit)))
(mew-inherit-7bit
(if (mew-case-equal cte mew-8bit)
(setq cte mew-default-encoding)))
(mew-use-8bit
(if (mew-encode-charset-8bitp charset)
(setq cte mew-8bit))))
(when (and (not no-encoding)
(or (mew-case-equal cte mew-7bit)
(mew-case-equal cte mew-8bit)))
(save-excursion
(goto-char beg)
(mew-set-buffer-multibyte nil)
(catch 'long-line
(while t
(setq last (point))
(if (/= (forward-line) 0) (end-of-line))
(when (>= (- (point) last) mew-encode-max-line-length) ;; including LF
(if (not mew-ask-encoding)
(setq cte mew-default-encoding)
(setq cte (mew-input-encoding)))
(throw 'long-line nil))
(if (eobp) (throw 'long-line nil))))
(mew-set-buffer-multibyte t))))))
((string= ct mew-ct-msg)
(if (mew-encode-file-8bitp file)
(setq cte mew-8bit)
(setq cte mew-7bit)))
(t
(if (and no-encoding cte (mew-case-equal cte mew-b64))
(setq cte mew-bin))
;; There are 7bit ascii bodies such as
;; application/pgp-encrypted and message/external-body.
;; If 7bit or 8bit, it should be linebase.
(if (null cte) (setq cte mew-7bit))))
(cond
((mew-case-equal cte mew-bin)
(mew-frwlet mew-cs-binary mew-cs-dummy
(mew-insert-file-contents file)))
((or (mew-case-equal cte mew-7bit) (mew-case-equal cte mew-8bit))
;; Certainly linebase here.
(unless textp
(mew-frwlet mew-cs-text-for-read mew-cs-dummy
(mew-insert-file-contents file)))
(when (and (string= ct mew-ct-msg)
(or mew-inherit-7bit (not mew-use-8bit))
(mew-case-equal cte mew-8bit))
(save-restriction
(setq cte mew-7bit)
(narrow-to-region beg (point-max))
(mew-convert-message))))
((and (mew-case-equal cte mew-b64) (fboundp 'base64-encode-region))
(unless textp
(mew-frwlet (if linebasep mew-cs-text-for-read mew-cs-binary) mew-cs-dummy
(mew-insert-file-contents file)))
(when linebasep
(goto-char beg)
(mew-lf-to-crlf))
(base64-encode-region beg (point-max))
(goto-char (point-max))
(insert "\n"))
((mew-which-exec mew-prog-mime-encode)
(setq opt (mew-prog-mime-encode-get-opt cte switch))
(if (null opt)
(mew-encode-error (concat "Unknown CTE: " cte))
(when textp
(setq file (mew-make-temp-name))
(mew-frwlet mew-cs-dummy mew-cs-text-for-write
;; NEVER use call-process-region for privacy reasons
(write-region beg (point-max) file nil 'no-msg))
(delete-region beg (point-max)))
(mew-piolet mew-cs-text-for-read mew-cs-dummy
(apply 'call-process mew-prog-mime-encode file t nil opt))
(if textp (mew-delete-file file))))
(t
(mew-encode-error (concat mew-prog-mime-encode " does not exist"))))
(list cte charset flowed delsp)))
(defun mew-encode-no-mime-encoding (privacy)
(let ((first (car privacy)))
(and (listp first)
(or (string= (car first) mew-ct-mle)
(string= (car first) mew-ct-smm)))))
(defun mew-broken-name (cdpl)
(let ((mew-encode-word-max-length 1000) ;; xxx
(file (nth 1 (assoc "filename" cdpl)))
name)
(when (and file (string-match mew-regex-nonascii file))
(setq name (car (mew-header-encode-string file)))
;; name must not be double-quoted here.
;; mew-heaer-insert will do this later
(list "name" name))))
(defun mew-encode-flowed (beg end charset)
"Encoding lines with RFC 3676"
(let (flowed delsp column)
(save-excursion
(goto-char beg)
(save-restriction
(narrow-to-region beg end)
(when (mew-encode-flowed-check)
(setq flowed t)
(setq delsp (mew-charset-to-delsp charset))
(setq column mew-flowed-fold-length)
(if delsp (setq column (1- column)))
(while (not (eobp))
(mew-encode-flowed-line column delsp)
(forward-line)))))
(list flowed delsp)))
(defun mew-encode-flowed-remove-trailing-sp ()
(while (and (not (bobp)) (= (char-before) mew-sp))
(delete-char -1)))
(defun mew-encode-flowed-line (column delsp)
(let (prefix beg)
(looking-at "^>*")
(setq prefix (mew-match-string 0))
(goto-char (match-end 0))
(if (looking-at " ")
(if (string= prefix "")
(insert mew-flowed-stuffed)
(progn
(setq prefix (format "%s%c" prefix mew-flowed-stuffed))
(forward-char)))
(when (looking-at "From ")
(insert mew-flowed-stuffed)
(setq prefix (format "%s%c" prefix mew-flowed-stuffed))))
(setq beg (point))
(save-excursion
(end-of-line)
(unless (and (= (- (point) beg) 3)
(string= (mew-buffer-substring beg (point)) "-- "))
(mew-encode-flowed-remove-trailing-sp)))
(move-to-column column)
(catch 'loop
(while (not (eolp))
(cond
(delsp
(while (> (current-column) column)
(backward-char 1))
(insert " \n"))
(t
(if (search-backward " " beg t)
(forward-char)
(unless (search-forward " " (save-excursion (end-of-line) (point)) t)
(throw 'loop (end-of-line))))
(insert "\n")))
(insert prefix)
(setq beg (point))
(move-to-column column)))))
(defun mew-encode-flowed-check ()
(catch 'loop
(save-excursion
(save-restriction
(narrow-to-region (point-min) (min (point-max) mew-file-max-size))
(goto-char (point-min))
(while (not (eobp))
(end-of-line)
(if (> (current-column) mew-flowed-fold-threshold)
(throw 'loop t))
(forward-line))))))
(defun mew-encode-singlepart (syntax &optional path depth buffered coverp)
;; path is nil if called make-single or security multipart
;; buffered is t if called make-single
(run-hook-with-args 'mew-encode-singlepart-hook
syntax path depth buffered)
(let* ((file (expand-file-name (mew-syntax-get-file syntax) path))
(ctl (mew-syntax-get-ct syntax))
(ct (mew-syntax-get-value ctl 'cap))
(cte (mew-syntax-get-cte syntax))
(cd (mew-syntax-get-cd syntax))
(cdpl (mew-syntax-get-cdp syntax))
(privacy (mew-syntax-get-privacy syntax))
(no-encoding (mew-encode-no-mime-encoding privacy))
(mew-inherit-7bit (mew-encode-limit-7bitp privacy))
(beg (point))
mret charset bodybeg cst ask-cst broken-name flowed delsp)
(setq mret (mew-encode-mime-body ctl cte (or buffered file) no-encoding))
(goto-char beg)
(mew-set '(cte charset flowed delsp) mret)
(setq ctl (mew-delete "icharset" ctl))
(when charset
(setq ctl (mew-syntax-get-params ctl))
(setq ctl (mew-delete "charset" ctl))
(setq ctl (cons ct (cons (list "charset" charset) ctl))))
(when flowed
(setq ctl (nconc ctl (list (list "format" "flowed"))))
(if delsp (setq ctl (nconc ctl (list (list "delsp" "yes"))))))
;;
(setq ctl (mew-delete "name" ctl))
(setq broken-name (mew-broken-name cdpl))
(if broken-name (setq ctl (nconc ctl (list broken-name))))
;;
(mew-header-insert mew-ct: ctl)
(mew-header-insert mew-cte: cte)
(and cd (mew-header-insert mew-cd: cd))
(and cdpl (mew-header-insert mew-cdp: cdpl))
(insert "\n")
;; header "\n" (cur) [text]
(setq bodybeg (point))
(goto-char (point-max))
(when (and (string= ct mew-ct-msg) mew-field-delete-for-forwarding)
(save-restriction
(narrow-to-region bodybeg (point-max))
(mew-header-delete-lines mew-field-delete-common)
(mew-header-delete-lines mew-field-delete-for-forwarding)))
(when privacy
(mew-encode-security-multipart
beg privacy depth (mew-syntax-get-decrypters syntax) cte))
(goto-char (point-max))
(when (and coverp (setq cst charset))
(cond
((null mew-ask-charset)
;; not ask
)
((eq mew-ask-charset t)
(if (mew-member-case-equal cst mew-cs-m17n-list)
(setq ask-cst t)))
((listp mew-ask-charset)
(unless (mew-member-case-equal cst mew-ask-charset)
(setq ask-cst t))))
(if (and ask-cst
(not (y-or-n-p (format "%s is used. OK? " cst))))
(mew-encode-error "Modify body")))
(mew-case-equal cte mew-8bit)))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;
;;; Encoding multipart
;;;
(defun mew-encode-make-multi ()
;; Just after the header
(let (beg path multip buffered privacy decrypters first ct)
(if (mew-encode-syntax-have-one-part)
;; A user may want to do any MIME stuff to the body
(progn
(setq mew-encode-syntax (mew-syntax-get-part mew-encode-syntax))
(setq buffered t))
;; See if a cover page is empty or not
(setq beg (point))
(save-excursion
(while (and (looking-at "^$") (not (eobp)))
(forward-line))
(unless (eobp)
;; The cover page exists.
(setq buffered t)))
(setq path (mew-expand-folder mew-attach-folder))
(if buffered
;; The cover page exists.
(setq multip t)
;; The cover page does not exist.
(delete-region beg (point-max))
;; Remove the cover page entry from the syntax.
(setq mew-encode-syntax
(mew-syntax-remove-entry mew-encode-syntax '(1)))
;; After removing the over page, see if this message has
;; only one text part.
(if (not (mew-encode-syntax-have-one-part))
(setq multip t)
(setq first (mew-syntax-get-part mew-encode-syntax))
(setq ct (mew-syntax-get-value (mew-syntax-get-ct first) 'cap))
(if (not (mew-ct-textp ct))
(setq multip t)
(setq path (expand-file-name
(mew-syntax-get-file mew-encode-syntax) path))
(setq privacy (mew-syntax-get-privacy mew-encode-syntax))
(setq decrypters (mew-syntax-get-decrypters mew-encode-syntax))
(setq mew-encode-syntax (mew-syntax-get-part mew-encode-syntax))
(mew-syntax-set-privacy mew-encode-syntax privacy)
(mew-syntax-set-decrypters mew-encode-syntax decrypters)))))
(if multip
(mew-encode-multipart mew-encode-syntax path 0 buffered)
(mew-encode-singlepart mew-encode-syntax path nil nil 'cover))))
(defvar mew-default-boundary "--%s(%s_%s)--")
(defun mew-boundary-get (&optional string)
;; boundary is less than or equal to 70
(unless string (setq string "Next_Part"))
(format mew-default-boundary
string
(mew-replace-character
(mew-replace-character (current-time-string) mew-sp ?_) ?: ?_)
(mew-random-string 3 t)))
(defun mew-encode-multipart (syntax path depth &optional buffered cte)
(let* ((boundary
(mew-boundary-get ;; 0 is nil for Next_Part
(if (> depth 0) (format "BOUNDARY%s" (number-to-string depth)))))
(fullname (expand-file-name (mew-syntax-get-file syntax) path))
(ctl (mew-syntax-get-ct syntax))
(ct (mew-syntax-get-value ctl 'cap))
(cd (mew-syntax-get-cd syntax))
(privacy (mew-syntax-get-privacy syntax))
(mew-inherit-7bit (mew-encode-limit-7bitp privacy))
(len (length syntax))
(beg (point))
(cnt mew-syntax-magic)
(8bit-cnt 0)
8bitp cte-pos cover)
(mew-header-insert mew-ct: (list ct (list "boundary" boundary)))
(setq cte-pos (point))
(and cd (mew-header-insert mew-cd: cd))
(while (< cnt len)
(insert "\n--" boundary "\n")
(if (mew-syntax-multipart-p (aref syntax cnt))
(setq 8bitp (mew-encode-multipart
(aref syntax cnt)
fullname
(1+ depth)))
(if (and (= depth 0) (= cnt mew-syntax-magic ))
(setq cover t)
(setq cover nil))
(setq 8bitp (mew-encode-singlepart
(aref syntax cnt)
fullname
(1+ depth)
(if (eq cnt mew-syntax-magic) buffered nil)
cover)))
(if 8bitp (setq 8bit-cnt (1+ 8bit-cnt)))
(setq cnt (1+ cnt)))
(insert "\n--" boundary "--\n")
(save-excursion
(goto-char cte-pos)
(mew-header-insert mew-cte: (if (> 8bit-cnt 0) mew-8bit mew-7bit)))
(when privacy
(mew-encode-security-multipart
beg privacy depth (mew-syntax-get-decrypters syntax) cte))
(goto-char (point-max))
(> 8bit-cnt 0)))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;
;;; Privacy services
;;;
(defun mew-encode-security-multipart (beg privacy depth decrypters cte)
(save-restriction
(narrow-to-region beg (point-max))
(let (proto ct)
(dolist (ent privacy)
(goto-char (point-min))
(mew-set '(ct proto) ent)
(setq ct (mew-capitalize ct))
(cond
((string= ct mew-ct-mle)
(mew-encode-multipart-encrypted ct proto depth decrypters cte))
((string= ct mew-ct-mls)
(mew-encode-multipart-signed ct proto depth))
((string= ct mew-ct-smm)
(mew-encode-smime proto cte decrypters)))))))
(defun mew-security-multipart-boundary (depth)
(if depth
(mew-boundary-get (format "Security_Multipart%s" (number-to-string depth)))
(mew-boundary-get "Security_Multipart")))
(defun mew-save-transfer-form (beg end retain &optional cte)
;; called in the narrowed region
(let ((sbeg beg) (send end) (draft-buf (current-buffer))
(ocs mew-cs-text-for-net)
tmpbuf file)