bc511a64f6
Most of this change is to boilerplate commentary such as license URLs. This change was prompted by ftp://ftp.gnu.org's going-away party, planned for November. Change these FTP URLs to https://ftp.gnu.org instead. Make similar changes for URLs to other organizations moving away from FTP. Also, change HTTP to HTTPS for URLs to gnu.org and fsf.org when this works, as this will further help defend against man-in-the-middle attacks (for this part I omitted the MS-DOS and MS-Windows sources and the test tarballs to keep the workload down). HTTPS is not fully working to lists.gnu.org so I left those URLs alone for now.
206 lines
6.9 KiB
EmacsLisp
206 lines
6.9 KiB
EmacsLisp
;;; mailclient.el --- mail sending via system's mail client.
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;; Copyright (C) 2005-2017 Free Software Foundation, Inc.
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;; Author: David Reitter <david.reitter@gmail.com>
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;; Keywords: mail
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
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;;; Commentary:
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;; This package allows handing over a buffer to be sent off
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;; via the system's designated e-mail client.
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;; Note that the e-mail client will display the contents of the buffer
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;; again for editing.
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;; The e-mail client is taken to be whoever handles a mailto: URL
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;; via `browse-url'.
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;; Mailto: URLs are composed according to RFC2368.
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;; MIME bodies are not supported - we rather expect the mail client
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;; to encode the body and add, for example, a digital signature.
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;; The mailto URL RFC calls for "short text messages that are
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;; actually the content of automatic processing."
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;; So mailclient.el is ideal for situations where an e-mail is
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;; generated automatically, and the user can edit it in the
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;; mail client (e.g. bug-reports).
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;; To activate:
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;; (setq send-mail-function 'mailclient-send-it) ; if you use `mail'
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;;; Code:
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(require 'sendmail) ;; for mail-sendmail-undelimit-header
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(require 'mail-utils) ;; for mail-fetch-field
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(require 'browse-url)
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(defcustom mailclient-place-body-on-clipboard-flag
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(fboundp 'w32-set-clipboard-data)
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"If non-nil, put the e-mail body on the clipboard in mailclient.
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This is useful on systems where only short mailto:// URLs are
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supported. Defaults to non-nil on Windows, nil otherwise."
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:type 'boolean
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:group 'mail)
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(defun mailclient-encode-string-as-url (string)
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"Convert STRING to a URL, using utf-8 as encoding."
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(apply (function concat)
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(mapcar
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(lambda (char)
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(cond
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((eq char ?\n) "%0D%0A") ;; newline
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((string-match "[-a-zA-Z0-9._~]" (char-to-string char))
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(char-to-string char)) ;; unreserved as per RFC 6068
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(t ;; everything else
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(format "%%%02x" char)))) ;; escape
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;; Convert string to list of chars
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(append (encode-coding-string string 'utf-8)))))
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(defvar mailclient-delim-static "?")
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(defun mailclient-url-delim ()
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(let ((current mailclient-delim-static))
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(setq mailclient-delim-static "&")
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current))
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(defun mailclient-gather-addresses (str &optional drop-first-name)
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(let ((field (mail-fetch-field str nil t)))
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(if field
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(save-excursion
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(let ((first t)
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(result ""))
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(mapc
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(lambda (recp)
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(setq result
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(concat
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result
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(if (and drop-first-name
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first)
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""
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(concat (mailclient-url-delim) str "="))
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(mailclient-encode-string-as-url
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recp)))
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(setq first nil))
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(split-string
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(mail-strip-quoted-names field) ", *"))
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result)))))
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(declare-function clipboard-kill-ring-save "menu-bar.el"
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(beg end &optional region))
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;;;###autoload
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(defun mailclient-send-it ()
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"Pass current buffer on to the system's mail client.
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Suitable value for `send-mail-function'.
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The mail client is taken to be the handler of mailto URLs."
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(require 'mail-utils)
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(let ((case-fold-search nil)
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delimline
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(mailbuf (current-buffer)))
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(unwind-protect
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(with-temp-buffer
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(insert-buffer-substring mailbuf)
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;; Move to header delimiter
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(mail-sendmail-undelimit-header)
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(setq delimline (point-marker))
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(if mail-aliases
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(expand-mail-aliases (point-min) delimline))
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(goto-char (point-min))
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;; ignore any blank lines in the header
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(while (and (re-search-forward "\n\n\n*" delimline t)
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(< (point) delimline))
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(replace-match "\n"))
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(let ((case-fold-search t)
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(mime-charset-pattern
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(concat
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"^content-type:[ \t]*text/plain;"
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"\\(?:[ \t\n]*\\(?:format\\|delsp\\)=\"?[-a-z0-9]+\"?;\\)*"
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"[ \t\n]*charset=\"?\\([^ \t\n\";]+\\)\"?"))
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coding-system
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character-coding
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;; Use the external browser function to send the
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;; message.
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(browse-url-mailto-function nil))
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;; initialize limiter
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(setq mailclient-delim-static "?")
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;; construct and call up mailto URL
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(browse-url
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(concat
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(save-excursion
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(narrow-to-region (point-min) delimline)
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(goto-char (point-min))
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(setq coding-system
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(if (re-search-forward mime-charset-pattern nil t)
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(coding-system-from-name (match-string 1))
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'undecided))
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(setq character-coding
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(mail-fetch-field "content-transfer-encoding"))
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(when character-coding
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(setq character-coding (downcase character-coding)))
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(concat
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"mailto:"
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;; some of the headers according to RFC822
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(mailclient-gather-addresses "To"
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'drop-first-name)
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(mailclient-gather-addresses "cc" )
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(mailclient-gather-addresses "bcc" )
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(mailclient-gather-addresses "Resent-To" )
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(mailclient-gather-addresses "Resent-cc" )
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(mailclient-gather-addresses "Resent-bcc" )
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(mailclient-gather-addresses "Reply-To" )
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;; The From field is not honored for now: it's
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;; not necessarily configured. The mail client
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;; knows the user's address(es)
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;; (mailclient-gather-addresses "From" )
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;; subject line
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(let ((subj (mail-fetch-field "Subject" nil t)))
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(widen) ;; so we can read the body later on
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(if subj ;; if non-blank
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;; the mail client will deal with
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;; warning the user etc.
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(concat (mailclient-url-delim) "subject="
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(mailclient-encode-string-as-url subj))
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""))))
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;; body
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(mailclient-url-delim) "body="
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(progn
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(delete-region (point-min) delimline)
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(unless (null character-coding)
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;; mailto: and clipboard need UTF-8 and cannot deal with
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;; Content-Transfer-Encoding or Content-Type.
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;; FIXME: There is code duplication here with rmail.el.
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(set-buffer-multibyte nil)
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(cond
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((string= character-coding "base64")
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(base64-decode-region (point-min) (point-max)))
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((string= character-coding "quoted-printable")
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(mail-unquote-printable-region (point-min) (point-max)
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nil nil t))
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(t (error "unsupported Content-Transfer-Encoding: %s"
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character-coding)))
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(decode-coding-region (point-min) (point-max) coding-system))
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(mailclient-encode-string-as-url
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(if mailclient-place-body-on-clipboard-flag
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(progn
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(clipboard-kill-ring-save (point-min) (point-max))
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(concat
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"*** E-Mail body has been placed on clipboard, "
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"please paste it here! ***"))
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(buffer-string)))))))))))
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(provide 'mailclient)
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;;; mailclient.el ends here
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