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;;; epg-tests.el --- Test suite for epg.el -*- lexical-binding: t -*-

;; Copyright (C) 2013-2015 Free Software Foundation, Inc.

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;; This file is part of GNU Emacs.

;; 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
;; the Free Software Foundation, either version 3 of the License, or
;; (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
;; 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
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;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
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;;; Commentary:

;;; Code:

(require 'ert)
(require 'epg)

(defvar epg-tests-context nil)

(defvar epg-tests-data-directory
  (expand-file-name "data/epg" (getenv "EMACS_TEST_DIRECTORY"))
  "Directory containing epg test data.")

(defun epg-tests-gpg-usable (&optional require-passphrase)
  (and (executable-find epg-gpg-program)
       (condition-case nil
	   (progn
	     (epg-check-configuration (epg-configuration))
	     (if require-passphrase
		 (string-match "\\`1\\."
			       (cdr (assq 'version (epg-configuration))))
	       t))
	 (error nil))))

(defun epg-tests-passphrase-callback (_c _k _d)
  ;; Need to create a copy here, since the string will be wiped out
  ;; after the use.
  (copy-sequence "test0123456789"))

(cl-defmacro with-epg-tests ((&optional &key require-passphrase
					require-public-key
					require-secret-key)
			    &rest body)
  "Set up temporary locations and variables for testing."
  (declare (indent 1))
  `(let* ((epg-tests-home-directory (make-temp-file "epg-tests-homedir" t)))
     (unwind-protect
	 (let ((context (epg-make-context 'OpenPGP)))
	   (setf (epg-context-home-directory context)
		 epg-tests-home-directory)
	   (setenv "GPG_AGENT_INFO")
	   ,(if require-passphrase
		`(epg-context-set-passphrase-callback
		  context
		  #'epg-tests-passphrase-callback))
	   ,(if require-public-key
		`(epg-import-keys-from-file
		  context
		  (expand-file-name "pubkey.asc" epg-tests-data-directory)))
	   ,(if require-secret-key
		`(epg-import-keys-from-file
		  context
		  (expand-file-name "seckey.asc" epg-tests-data-directory)))
	   (with-temp-buffer
	     (make-local-variable 'epg-tests-context)
	     (setq epg-tests-context context)
	     ,@body))
       (when (file-directory-p epg-tests-home-directory)
	 (delete-directory epg-tests-home-directory t)))))

(ert-deftest epg-decrypt-1 ()
  (skip-unless (epg-tests-gpg-usable 'require-passphrase))
  (with-epg-tests (:require-passphrase t)
    (should (equal "test"
		   (epg-decrypt-string epg-tests-context "\
-----BEGIN PGP MESSAGE-----
Version: GnuPG v2

jA0EAwMCE19JBLTvvmhgyRrGGglRbnKkK9PJG8fDwO5ccjysrR7IcdNcnA==
=U8z7
-----END PGP MESSAGE-----")))))

(ert-deftest epg-roundtrip-1 ()
  (skip-unless (epg-tests-gpg-usable 'require-passphrase))
  (with-epg-tests (:require-passphrase t)
    (let ((cipher (epg-encrypt-string epg-tests-context "symmetric" nil)))
      (should (equal "symmetric"
		     (epg-decrypt-string epg-tests-context cipher))))))

(ert-deftest epg-roundtrip-2 ()
  (skip-unless (epg-tests-gpg-usable 'require-passphrase))
  (with-epg-tests (:require-passphrase t
		   :require-public-key t
		   :require-secret-key t)
    (let* ((recipients (epg-list-keys epg-tests-context "joe@example.com"))
	   (cipher (epg-encrypt-string epg-tests-context "public key"
				       recipients nil t)))
      (should (equal "public key"
		     (epg-decrypt-string epg-tests-context cipher))))))

(ert-deftest epg-sign-verify-1 ()
  (skip-unless (epg-tests-gpg-usable 'require-passphrase))
  (with-epg-tests (:require-passphrase t
		   :require-public-key t
		   :require-secret-key t)
    (let (signature verify-result)
      (setf (epg-context-signers epg-tests-context)
	    (epg-list-keys epg-tests-context "joe@example.com"))
      (setq signature (epg-sign-string epg-tests-context "signed" t))
      (epg-verify-string epg-tests-context signature "signed")
      (setq verify-result (epg-context-result-for context 'verify))
      (should (= 1 (length verify-result)))
      (should (eq 'good (epg-signature-status (car verify-result)))))))

(ert-deftest epg-sign-verify-2 ()
  (skip-unless (epg-tests-gpg-usable 'require-passphrase))
  (with-epg-tests (:require-passphrase t
		   :require-public-key t
		   :require-secret-key t)
    (let (signature verify-result)
      (setf (epg-context-signers epg-tests-context)
	    (epg-list-keys epg-tests-context "joe@example.com"))
      (setq signature (epg-sign-string epg-tests-context "clearsigned" 'clear))
      ;; Clearsign signature always ends with a new line.
      (should (equal "clearsigned\n"
		     (epg-verify-string epg-tests-context signature)))
      (setq verify-result (epg-context-result-for context 'verify))
      (should (= 1 (length verify-result)))
      (should (eq 'good (epg-signature-status (car verify-result)))))))

(ert-deftest epg-sign-verify-3 ()
  (skip-unless (epg-tests-gpg-usable 'require-passphrase))
  (with-epg-tests (:require-passphrase t
		   :require-public-key t
		   :require-secret-key t)
    (let (signature verify-result)
      (setf (epg-context-signers epg-tests-context)
	    (epg-list-keys epg-tests-context "joe@example.com"))
      (setq signature (epg-sign-string epg-tests-context "normal signed"))
      (should (equal "normal signed"
		     (epg-verify-string epg-tests-context signature)))
      (setq verify-result (epg-context-result-for context 'verify))
      (should (= 1 (length verify-result)))
      (should (eq 'good (epg-signature-status (car verify-result)))))))

(ert-deftest epg-import-1 ()
  (skip-unless (epg-tests-gpg-usable 'require-passphrase))
  (with-epg-tests (:require-passphrase nil)
    (should (= 0 (length (epg-list-keys epg-tests-context))))
    (should (= 0 (length (epg-list-keys epg-tests-context nil t)))))
  (with-epg-tests (:require-passphrase nil
		   :require-public-key t)
    (should (= 1 (length (epg-list-keys epg-tests-context))))
    (should (= 0 (length (epg-list-keys epg-tests-context nil t)))))
  (with-epg-tests (:require-public-key nil
		   :require-public-key t
		   :require-secret-key t)
    (should (= 1 (length (epg-list-keys epg-tests-context))))
    (should (= 1 (length (epg-list-keys epg-tests-context nil t))))))

(provide 'epg-tests)

;;; epg-tests.el ends here