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;;; url-domsuf.el --- Say what domain names can have cookies set. -*- lexical-binding:t -*-
;; Copyright (C) 2012-2024 Free Software Foundation, Inc.
;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
;; Keywords: comm, data, processes, hypermedia
;; This file is part of GNU Emacs.
;;
;; GNU Emacs is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
;;; Commentary:
;; The rules for what domains can have cookies set is defined here:
;; https://publicsuffix.org/list/
;;; Code:
(defvar url-domsuf-domains nil)
(defun url-domsuf--public-suffix-file ()
"Look for and return a file name for a recent \"public_suffix_list.dat\".
Emacs ships with a copy of this file, but some systems might have
a newer version available. Look for it in some standard
locations, and if a newer file was found, then return that."
(car (sort
(seq-filter
#'file-readable-p
(list (expand-file-name "publicsuffix.txt.gz" data-directory)
(expand-file-name "publicsuffix.txt" data-directory)
;; Debian and Fedora
"/usr/share/publicsuffix/public_suffix_list.dat"
;; FreeBSD port
"/usr/local/share/public_suffix_list/public_suffix_list.dat"))
#'file-newer-than-file-p)))
(defun url-domsuf-parse-file ()
(with-temp-buffer
(with-auto-compression-mode
(insert-file-contents (url-domsuf--public-suffix-file)))
(let ((domains nil)
domain exception)
(while (not (eobp))
(when (not (looking-at "[/\n\t ]"))
;; !pref.aichi.jp means that it's allowed.
(if (not (eq (following-char) ?!))
(setq exception nil)
(setq exception t)
(forward-char 1))
(setq domain (buffer-substring (point) (line-end-position)))
(cond
((string-match "\\`\\*\\." domain)
(setq domain (substring domain 2))
(push (cons domain (1+ (length (split-string domain "[.]"))))
domains))
(exception
(push (cons domain t) domains))
(t
(push (cons domain nil) domains))))
(forward-line 1))
(setq url-domsuf-domains (nreverse domains)))))
(defun url-domsuf-cookie-allowed-p (domain)
(unless url-domsuf-domains
(url-domsuf-parse-file))
(let* ((allowedp t)
(domain-bits (split-string domain "[.]"))
(length (length domain-bits))
(upper-domain (mapconcat 'identity (cdr domain-bits) "."))
entry modifier)
(dolist (elem url-domsuf-domains)
(setq entry (car elem)
modifier (cdr elem))
(cond
;; "com"
((and (null modifier)
(string= domain entry))
(setq allowedp nil))
;; "!city.yokohama.jp"
((and (eq modifier t)
(string= domain entry))
(setq allowedp t))
;; "*.bd"
((and (numberp modifier)
(= length modifier)
(string= entry upper-domain))
(setq allowedp nil))))
allowedp))
(provide 'url-domsuf)
;;; url-domsuf.el ends here
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