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;;; textsec-check.el --- Check for suspicious texts -*- lexical-binding: t; -*-
;; Copyright (C) 2022 Free Software Foundation, Inc.
;; 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:
;;
;;; Code:
(defgroup textsec nil
"Suspicious text identification."
:group 'security
:version "29.1")
(defcustom textsec-check t
"If non-nil, perform some security-related checks on text objects.
If nil, these checks are disabled."
:type 'boolean
:version "29.1")
(defface textsec-suspicious
'((t (:weight bold :background "red")))
"Face used to highlight suspicious strings.")
;;;###autoload
(defun textsec-suspicious-p (object type)
"Say whether OBJECT is suspicious for use as TYPE.
If OBJECT is suspicious, return a string explaining the reason
for considering it suspicious, otherwise return nil.
Available values of TYPE and corresponding OBJECTs are:
`url' -- a URL; OBJECT should be a URL string.
`link' -- an HTML link; OBJECT should be a cons cell
of the form (URL . LINK-TEXT).
`domain' -- a Web domain; OBJECT should be a string.
`local-address' -- the local part of an email address; OBJECT
should be a string.
`name' -- the \"display name\" part of an email address;
OBJECT should be a string.
`email-address' -- a full email address; OBJECT should be a string.
`email-address-header' -- a raw email address header in RFC 2822 format;
OBJECT should be a string.
If the user option `textsec-check' is nil, these checks are
disabled, and this function always returns nil."
(if (not textsec-check)
nil
(require 'textsec)
(let ((func (intern (format "textsec-%s-suspicious-p" type))))
(unless (fboundp func)
(error "%s is not a valid function" func))
(funcall func object))))
(provide 'textsec-check)
;;; textsec-check.el ends here
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