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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.
250 lines
9.1 KiB
EmacsLisp
250 lines
9.1 KiB
EmacsLisp
;;; puny.el --- translate non-ASCII domain names to ASCII
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;; Copyright (C) 2015-2017 Free Software Foundation, Inc.
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;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
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;; Keywords: mail, net
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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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;; Written by looking at
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;; http://stackoverflow.com/questions/183485/can-anyone-recommend-a-good-free-javascript-for-punycode-to-unicode-conversion
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;;; Code:
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(require 'seq)
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(defun puny-encode-domain (domain)
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"Encode DOMAIN according to the IDNA/punycode algorithm.
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For instance, \"fśf.org\" => \"xn--ff-2sa.org\"."
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;; The vast majority of domain names are not IDNA domain names, so
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;; add a check first to avoid doing unnecessary work.
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(if (string-match "\\'[[:ascii:]]+\\'" domain)
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domain
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(mapconcat 'puny-encode-string (split-string domain "[.]") ".")))
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(defun puny-encode-string (string)
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"Encode STRING according to the IDNA/punycode algorithm.
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This is used to encode non-ASCII domain names.
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For instance, \"bücher\" => \"xn--bcher-kva\"."
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(let ((ascii (seq-filter (lambda (char)
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(< char 128))
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string)))
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(if (= (length ascii) (length string))
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string
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(concat "xn--"
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(if (null ascii)
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""
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(concat ascii "-"))
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(puny-encode-complex (length ascii) string)))))
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(defun puny-decode-domain (domain)
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"Decode DOMAIN according to the IDNA/punycode algorithm.
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For instance, \"xn--ff-2sa.org\" => \"fśf.org\"."
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(mapconcat 'puny-decode-string (split-string domain "[.]") "."))
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(defun puny-decode-string (string)
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"Decode an IDNA/punycode-encoded string.
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For instance \"xn--bcher-kva\" => \"bücher\"."
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(if (string-match "\\`xn--" string)
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(puny-decode-string-internal (substring string 4))
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string))
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(defconst puny-initial-n 128)
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(defconst puny-initial-bias 72)
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(defconst puny-base 36)
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(defconst puny-damp 700)
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(defconst puny-tmin 1)
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(defconst puny-tmax 26)
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(defconst puny-skew 28)
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;; 0-25 a-z
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;; 26-36 0-9
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(defun puny-encode-digit (d)
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(if (< d 26)
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(+ ?a d)
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(+ ?0 (- d 26))))
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(defun puny-adapt (delta num-points first-time)
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(let ((delta (if first-time
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(/ delta puny-damp)
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(/ delta 2)))
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(k 0))
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(setq delta (+ delta (/ delta num-points)))
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(while (> delta (/ (* (- puny-base puny-tmin)
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puny-tmax)
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2))
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(setq delta (/ delta (- puny-base puny-tmin))
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k (+ k puny-base)))
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(+ k (/ (* (1+ (- puny-base puny-tmin)) delta)
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(+ delta puny-skew)))))
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(defun puny-encode-complex (insertion-points string)
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(let ((n puny-initial-n)
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(delta 0)
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(bias puny-initial-bias)
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(h insertion-points)
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result m ijv q)
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(while (< h (length string))
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(setq ijv (cl-loop for char across string
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when (>= char n)
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minimize char))
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(setq m ijv)
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(setq delta (+ delta (* (- m n) (+ h 1)))
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n m)
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(cl-loop for char across string
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when (< char n)
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do (cl-incf delta)
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when (= char ijv)
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do (progn
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(setq q delta)
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(cl-loop with k = puny-base
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for t1 = (cond
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((<= k bias)
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puny-tmin)
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((>= k (+ bias puny-tmax))
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puny-tmax)
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(t
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(- k bias)))
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while (>= q t1)
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do (push (puny-encode-digit
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(+ t1 (mod (- q t1)
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(- puny-base t1))))
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result)
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do (setq q (/ (- q t1) (- puny-base t1))
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k (+ k puny-base)))
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(push (puny-encode-digit q) result)
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(setq bias (puny-adapt delta (+ h 1) (= h insertion-points))
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delta 0
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h (1+ h))))
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(cl-incf delta)
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(cl-incf n))
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(nreverse result)))
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(defun puny-decode-digit (cp)
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(cond
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((<= cp ?9)
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(+ (- cp ?0) 26))
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((<= cp ?Z)
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(- cp ?A))
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((<= cp ?z)
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(- cp ?a))
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(t
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puny-base)))
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(defun puny-decode-string-internal (string)
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(with-temp-buffer
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(insert string)
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;; The encoded chars are after any final dash, else the whole string.
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(let ((encoded (buffer-substring
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(if (search-backward "-" nil 'move)
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(1+ (point))
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(point))
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(point-max)))
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(ic 0)
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(i 0)
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(bias puny-initial-bias)
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(n puny-initial-n)
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out)
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(delete-region (point) (point-max))
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(while (< ic (length encoded))
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(let ((old-i i)
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(w 1)
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(k puny-base)
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digit t1)
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(cl-loop do (progn
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(setq digit (puny-decode-digit (aref encoded ic)))
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(cl-incf ic)
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(cl-incf i (* digit w))
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(setq t1 (cond
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((<= k bias)
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puny-tmin)
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((>= k (+ bias puny-tmax))
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puny-tmax)
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(t
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(- k bias)))))
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while (>= digit t1)
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do (setq w (* w (- puny-base t1))
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k (+ k puny-base)))
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(setq out (1+ (buffer-size)))
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(setq bias (puny-adapt (- i old-i) out (= old-i 0))))
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(setq n (+ n (/ i out))
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i (mod i out))
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(goto-char (point-min))
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(forward-char i)
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(insert (format "%c" n))
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(cl-incf i)))
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(buffer-string)))
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;; http://www.unicode.org/reports/tr39/#Restriction_Level_Detection
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;; http://www.unicode.org/reports/tr31/#Table_Candidate_Characters_for_Inclusion_in_Identifiers
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(defun puny-highly-restrictive-string-p (string)
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"Say whether STRING is \"highly restrictive\" in the Unicode IDNA sense.
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See http://www.unicode.org/reports/tr39/#Restriction_Level_Detection
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for details. The main idea is that if you're mixing
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scripts (like latin and cyrillic), you may confuse the user by
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using homographs."
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(let ((scripts
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(delq
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t
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(seq-uniq
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(seq-map (lambda (char)
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(if (memq char
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;; These characters are always allowed
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;; in any string.
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'(#x0027 ; APOSTROPHE
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#x002D ; HYPHEN-MINUS
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#x002E ; FULL STOP
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#x003A ; COLON
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#x00B7 ; MIDDLE DOT
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#x058A ; ARMENIAN HYPHEN
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#x05F3 ; HEBREW PUNCTUATION GERESH
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#x05F4 ; HEBREW PUNCTUATION GERSHAYIM
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#x0F0B ; TIBETAN MARK INTERSYLLABIC TSHEG
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#x200C ; ZERO WIDTH NON-JOINER*
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#x200D ; ZERO WIDTH JOINER*
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#x2010 ; HYPHEN
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#x2019 ; RIGHT SINGLE QUOTATION MARK
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#x2027 ; HYPHENATION POINT
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#x30A0 ; KATAKANA-HIRAGANA DOUBLE HYPHEN
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#x30FB)) ; KATAKANA MIDDLE DOT
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t
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(aref char-script-table char)))
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string)))))
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(or
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;; Every character uses the same script.
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(= (length scripts) 1)
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(seq-some 'identity
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(mapcar (lambda (list)
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(seq-every-p (lambda (script)
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(memq script list))
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scripts))
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'((latin han hiragana kana)
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(latin han bopomofo)
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(latin han hangul)))))))
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(defun puny-highly-restrictive-domain-p (domain)
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"Say whether DOMAIN is \"highly restrictive\" in the Unicode IDNA sense.
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See `puny-highly-restrictive-string-p' for further details."
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(seq-every-p 'puny-highly-restrictive-string-p (split-string domain "[.]")))
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(provide 'puny)
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;;; puny.el ends here
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