[Emacs-diffs] Changes to emacs/lisp/pgg-gpg.el

[Reiner Steib]

Index: emacs/lisp/pgg-gpg.el
diff -u emacs/lisp/pgg-gpg.el:1.14 emacs/lisp/pgg-gpg.el:1.15
--- emacs/lisp/pgg-gpg.el:1.14  Thu Apr  6 18:01:16 2006
+++ emacs/lisp/pgg-gpg.el       Fri Apr  7 21:06:12 2006
@@ -4,7 +4,8 @@
 ;;   2005, 2006 Free Software Foundation, Inc.
 
 ;; Author: Daiki Ueno <address@hidden>
-;; Symmetric encryption added by: Sascha Wilde <address@hidden>
+;; Symmetric encryption and gpg-agent support added by: 
+;;   Sascha Wilde <address@hidden>
 ;; Created: 1999/10/28
 ;; Keywords: PGP, OpenPGP, GnuPG
 
@@ -51,14 +52,21 @@
   :type '(choice (const :tag "New `--recipient' option" "--recipient")
                 (const :tag "Old `--remote-user' option" "--remote-user")))
 
+(defcustom pgg-gpg-use-agent nil
+  "Whether to use gnupg agent for key caching."
+  :group 'pgg-gpg
+  :type 'boolean)
+
 (defvar pgg-gpg-user-id nil
   "GnuPG ID of your default identity.")
 
 (defun pgg-gpg-process-region (start end passphrase program args)
-  (let* ((output-file-name (pgg-make-temp-file "pgg-output"))
+  (let* ((use-agent (pgg-gpg-use-agent-p)) 
+        (output-file-name (pgg-make-temp-file "pgg-output"))
         (args
          `("--status-fd" "2"
-           ,@(if passphrase '("--passphrase-fd" "0"))
+           ,@(if use-agent '("--use-agent")
+               (if passphrase '("--passphrase-fd" "0")))
            "--yes" ; overwrite
            "--output" ,output-file-name
            ,@pgg-gpg-extra-args ,@args))
@@ -100,7 +108,8 @@
       (set-default-file-modes orig-mode))))
 
 (defun pgg-gpg-possibly-cache-passphrase (passphrase &optional key notruncate)
-  (if (and pgg-cache-passphrase
+  (if (and passphrase
+          pgg-cache-passphrase
           (progn
             (goto-char (point-min))
             (re-search-forward "^\\[GNUPG:] 
\\(GOOD_PASSPHRASE\\>\\)\\|\\(SIG_CREATED\\)" nil t)))
@@ -180,7 +189,7 @@
 passphrase cache or user."
   (let* ((pgg-gpg-user-id (or pgg-gpg-user-id pgg-default-user-id))
         (passphrase (or passphrase
-                        (when sign
+                        (when (and sign (not (pgg-gpg-use-agent-p)))
                           (pgg-read-passphrase
                            (format "GnuPG passphrase for %s: "
                                    pgg-gpg-user-id)
@@ -212,8 +221,9 @@
 If optional PASSPHRASE is not specified, it will be obtained from the
 passphrase cache or user."
   (let* ((passphrase (or passphrase
-                        (pgg-read-passphrase
-                         "GnuPG passphrase for symmetric encryption: ")))
+                        (when (not (pgg-gpg-use-agent-p))
+                          (pgg-read-passphrase
+                           "GnuPG passphrase for symmetric encryption: "))))
         (args
          (append (list "--batch" "--armor" "--symmetric" )
                  (if pgg-text-mode (list "--textmode")))))
@@ -240,12 +250,13 @@
         (pgg-gpg-user-id (or key-id key
                              pgg-gpg-user-id pgg-default-user-id))
         (passphrase (or passphrase
-                        (pgg-read-passphrase
-                         (format (if (pgg-gpg-symmetric-key-p message-keys)
-                                     "Passphrase for symmetric decryption: "
-                                   "GnuPG passphrase for %s: ")
-                                 (or key-owner "??"))
-                         pgg-gpg-user-id)))
+                        (when (not (pgg-gpg-use-agent-p))
+                          (pgg-read-passphrase
+                           (format (if (pgg-gpg-symmetric-key-p message-keys)
+                                       "Passphrase for symmetric decryption: "
+                                     "GnuPG passphrase for %s: ")
+                                   (or key-owner "??"))
+                           pgg-gpg-user-id))))
         (args '("--batch" "--decrypt")))
     (pgg-gpg-process-region start end passphrase pgg-gpg-program args)
     (with-current-buffer pgg-errors-buffer
@@ -275,9 +286,11 @@
   "Make detached signature from text between START and END."
   (let* ((pgg-gpg-user-id (or pgg-gpg-user-id pgg-default-user-id))
         (passphrase (or passphrase
-                        (pgg-read-passphrase
-                         (format "GnuPG passphrase for %s: " pgg-gpg-user-id)
-                         pgg-gpg-user-id)))
+                        (when (not (pgg-gpg-use-agent-p))
+                          (pgg-read-passphrase
+                           (format "GnuPG passphrase for %s: "
+                                   pgg-gpg-user-id)
+                           pgg-gpg-user-id))))
         (args
          (append (list (if cleartext "--clearsign" "--detach-sign")
                        "--armor" "--batch" "--verbose"
@@ -343,6 +356,28 @@
     (append-to-buffer pgg-output-buffer (point-min)(point-max))
     (pgg-process-when-success)))
 
+(defun pgg-gpg-update-agent ()
+  "Try to connet to gpg-agent and send UPDATESTARTUPTTY."
+  (if (fboundp 'make-network-process)
+      (let* ((agent-info (getenv "GPG_AGENT_INFO"))
+            (socket (and agent-info
+                         (string-match "^\\([^:]*\\)" agent-info)
+                         (match-string 1 agent-info)))
+            (conn (and socket
+                       (make-network-process :name "gpg-agent-process"
+                                             :host 'local :family 'local
+                                             :service socket))))
+       (when (and conn (eq (process-status conn) 'open))
+         (process-send-string conn "UPDATESTARTUPTTY\n")
+         (delete-process conn)
+         t))
+    ;; We can't check, so assume gpg-agent is up.
+    t))
+
+(defun pgg-gpg-use-agent-p ()
+  "Return t if `pgg-gpg-use-agent' is t and gpg-agent is available."
+  (and pgg-gpg-use-agent (pgg-gpg-update-agent)))
+
 (provide 'pgg-gpg)
 
 ;;; arch-tag: 2aa5d5d8-93a0-4865-9312-33e29830e000