;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2020, 2021 Marius Bakke <marius@gnu.org>
;;;
;;; This file is part of GNU Guix.
;;;
;;; GNU Guix 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 Guix 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 Guix.  If not, see <http://www.gnu.org/licenses/>.

(define-module (gnu build chromium-extension)
  #:use-module (guix gexp)
  #:use-module (guix packages)
  #:use-module (gnu packages chromium)
  #:use-module (gnu packages gnupg)
  #:use-module (gnu packages tls)
  #:use-module (gnu packages xorg)
  #:use-module (guix build-system trivial)
  #:export (make-chromium-extension))

;;;</td></tr></table>
<table class='tabs'><tr><td>
<a href='/guix/about/'>about</a><a href='/guix/'>summary</a><a href='/guix/refs/?id=ef0a45c6413a35e0e7ee375cab2c6f7bc468ab5a'>refs</a><a href='/guix/log/gnu/packages/emacs-xyz.scm'>log</a><a href='/guix/tree/gnu/packages/emacs-xyz.scm?id=ef0a45c6413a35e0e7ee375cab2c6f7bc468ab5a'>tree</a><a href='/guix/commit/gnu/packages/emacs-xyz.scm?id=ef0a45c6413a35e0e7ee375cab2c6f7bc468ab5a'>commit</a><a class='active' href='/guix/diff/gnu/packages/emacs-xyz.scm?id=ef0a45c6413a35e0e7ee375cab2c6f7bc468ab5a&amp;id2=b7be0a999df8984fee8bd9d283b8fbe7e4da879d'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/gnu/packages/emacs-xyz.scm'>
<input type='hidden' name='id' value='ef0a45c6413a35e0e7ee375cab2c6f7bc468ab5a'/><input type='hidden' name='id2' value='b7be0a999df8984fee8bd9d283b8fbe7e4da879d'/><select name='qt'>
<option value='grep'>log msg</option>
<option value='author'>author</option>
<option value='committer'>committer</option>
<option value='range'>range</option>
</select>
<input class='txt' type='search' size='10' name='q' value=''/>
<input type='submit' value='search'/>
</form>
</td></tr></table>
<div class='path'>path: <a href='/guix/diff/?id=ef0a45c6413a35e0e7ee375cab2c6f7bc468ab5a&amp;id2=b7be0a999df8984fee8bd9d283b8fbe7e4da879d'>root</a>/<a href='/guix/diff/gnu?id=ef0a45c6413a35e0e7ee375cab2c6f7bc468ab5a&amp;id2=b7be0a999df8984fee8bd9d283b8fbe7e4da879d'>gnu</a>/<a href='/guix/diff/gnu/packages?id=ef0a45c6413a35e0e7ee375cab2c6f7bc468ab5a&amp;id2=b7be0a999df8984fee8bd9d283b8fbe7e4da879d'>packages</a>/<a href='/guix/diff/gnu/packages/emacs-xyz.scm?id=ef0a45c6413a35e0e7ee375cab2c6f7bc468ab5a&amp;id2=b7be0a999df8984fee8bd9d283b8fbe7e4da879d'>emacs-xyz.scm</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='ef0a45c6413a35e0e7ee375cab2c6f7bc468ab5a'/><input type='hidden' name='id2' value='b7be0a999df8984fee8bd9d283b8fbe7e4da879d'/><table><tr><td colspan='2'/></tr><tr><td class='label'>context:</td><td class='ctrl'><select name='context' onchange='this.form.submit();'><option value='1'>1</option><option value='2'>2</option><option value='3' selected='selected'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><div class='diffstat-header'><a href='/guix/diff/?id=ef0a45c6413a35e0e7ee375cab2c6f7bc468ab5a&amp;id2=b7be0a999df8984fee8bd9d283b8fbe7e4da879d'>Diffstat</a> (limited to 'gnu/packages/emacs-xyz.scm')</div><table summary='diffstat' class='diffstat'></table><div class='diffstat-summary'>0 files changed, 0 insertions, 0 deletions</div><table summary='diff' class='diff'><tr><td></td></tr></table></div> <!-- class=content -->
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      #:local-build? #t))

(define (file-sha256sum file)
  (with-extensions (list guile-gcrypt)
    #~(begin
        (use-modules (gcrypt base16) (gcrypt hash))
        (bytevector->base16-string (file-sha256 #$file)))))

(define* (make-chromium-extension pkg #:optional (pkg-output "out"))
  "Create a Chromium extension from package PKG and return a package that,
when installed, will make the extension contained in PKG available as a
Chromium browser extension.  PKG-OUTPUT specifies which output of PKG to use."
  (let* ((name (package-name pkg))
         (version (package-version pkg))
         (private-key (make-signing-key name))
         (public-key (signing-key->public-der private-key))
         (checksum (file-sha256sum public-key))
         (crx (make-crx private-key pkg pkg-output))
         (json (crx->chromium-json crx version)))
    (package
      (inherit pkg)
      (name (string-append name "-chromium"))
      (source #f)
      (native-inputs '())
      (inputs '())
      (propagated-inputs '())
      (outputs '("out"))
      (build-system trivial-build-system)
      (arguments
       (list #:modules '((guix build utils))
             #:builder
             #~(begin
                 (use-modules (guix build utils))
                 (define (base16-char->chromium-base16 char)
                   ;; Translate CHAR, a hexadecimal character, to a Chromium-style
                   ;; representation using the letters a-p (where a=0, p=15).
                   (string-ref "abcdefghijklmnop"
                               (string-index "0123456789abcdef" char)))
                 (let ((file-name (string-map base16-char->chromium-base16
                                              (string-take #$checksum 32)))
                       (extension-directory
                        (string-append #$output
                                       "/share/chromium/extensions")))
                   (mkdir-p extension-directory)
                   (symlink #$json (string-append extension-directory "/"
                                                  file-name ".json")))))))))