* epa-file.el

[elisp/epg.git] / epa-file.el

diff --git a/epa-file.el b/epa-file.el
index 705f18a..ff5b65f 100644 (file)
--- a/epa-file.el
+++ b/epa-file.el
@@ -1,4 +1,4 @@
-;;; epa-file.el --- the EasyPG Assistant hooks for transparent file encryption
+;;; epa-file.el --- the EasyPG Assistant, transparent file encryption
 ;; Copyright (C) 2006 Daiki Ueno
 
 ;; Author: Daiki Ueno <ueno@unixuser.org>
@@ -34,13 +34,19 @@
   :type 'regexp
   :group 'epa-file)
 
+(defcustom epa-file-cache-passphrase-for-symmetric-encryption nil
+  "If t, cache passphrase for symmetric encryption."
+  :type 'boolean
+  :group 'epa-file)
+
 (defvar epa-file-handler
   (cons epa-file-name-regexp 'epa-file-handler))
-  
+
 (defvar epa-file-passphrase-alist nil)
 
-(defun epa-file-passphrase-callback-function (key-id file)
-  (if (eq key-id 'SYM)
+(defun epa-file-passphrase-callback-function (context key-id file)
+  (if (and epa-file-cache-passphrase-for-symmetric-encryption
+          (eq key-id 'SYM))
       (let ((entry (assoc file epa-file-passphrase-alist))
            passphrase)
        (or (copy-sequence (cdr entry))
@@ -49,10 +55,11 @@
                (setq entry (list file)
                      epa-file-passphrase-alist (cons entry
                                                 epa-file-passphrase-alist)))
-             (setq passphrase (epg-passphrase-callback-function key-id nil))
+             (setq passphrase (epa-passphrase-callback-function context
+                                                                key-id nil))
              (setcdr entry (copy-sequence passphrase))
              passphrase)))
-    (epg-passphrase-callback-function key-id nil)))
+    (epa-passphrase-callback-function context key-id nil)))
 
 (defun epa-file-handler (operation &rest args)
   (save-match-data
@@ -69,11 +76,26 @@
        (inhibit-file-name-operation operation))
     (apply operation args)))
 
+(defun epa-file-decode-and-insert (string file visit beg end replace)
+  (if (fboundp 'decode-coding-inserted-region)
+      (save-restriction
+       (narrow-to-region (point) (point))
+       (let ((multibyte enable-multibyte-characters))
+         (set-buffer-multibyte nil)
+         (insert string)
+         (set-buffer-multibyte multibyte)
+         (decode-coding-inserted-region
+          (point-min) (point-max)
+          (substring file 0 (string-match epa-file-name-regexp file))
+          visit beg end replace)))
+    (insert (decode-coding-string string (or coding-system-for-read
+                                            'undecided)))))
+
 (defvar last-coding-system-used)
 (defun epa-file-insert-file-contents (file &optional visit beg end replace)
   (barf-if-buffer-read-only)
-  (if (or beg end)
-      (error "Can't read the file partially."))
+  (if (and visit (or beg end))
+      (error "Attempt to visit less than an entire file"))
   (setq file (expand-file-name file))
   (let ((local-copy (epa-file-run-real-handler #'file-local-copy (list file)))
        (context (epg-make-context))
@@ -84,26 +106,28 @@
      context
      (cons #'epa-file-passphrase-callback-function
           file))
+    (epg-context-set-progress-callback context
+                                      #'epa-progress-callback-function)
     (unwind-protect
        (progn
          (if replace
              (goto-char (point-min)))
          (condition-case error
-             (setq string (decode-coding-string
-                           (epg-decrypt-file context file nil)
-                           'undecided))
+             (setq string (epg-decrypt-file context file nil))
            (error
             (if (setq entry (assoc file epa-file-passphrase-alist))
                 (setcdr entry nil))
             (signal 'file-error
                     (cons "Opening input file" (cdr error)))))
-         (if (boundp 'last-coding-system-used)
-             (set-buffer-file-coding-system last-coding-system-used)
-           (set-buffer-file-coding-system default-buffer-file-coding-system))
-         (insert string)
-         (setq length (length string))
-         (if replace
-             (delete-region (point) (point-max))))
+         (if (or beg end)
+             (setq string (substring string (or beg 0) end)))
+         (save-excursion
+           (save-restriction
+             (narrow-to-region (point) (point))
+             (epa-file-decode-and-insert string file visit beg end replace)
+             (setq length (- (point-max) (point-min))))
+           (if replace
+               (delete-region (point) (point-max)))))
       (if (and local-copy
               (file-exists-p local-copy))
          (delete-file local-copy)))
@@ -115,11 +139,12 @@
   (if append
       (error "Can't append to the file."))
   (setq file (expand-file-name file))
-  (let* ((coding-system (if (boundp 'last-coding-system-used)
-                           (condition-case nil
-                               (write-region (point-min) (point-max) "/")
-                             (error last-coding-system-used))
-                         buffer-file-coding-system))
+  (let* ((coding-system (or coding-system-for-write
+                           (if (boundp 'last-coding-system-used)
+                               (condition-case nil
+                                   (write-region (point-min) (point-max) "/")
+                                 (error last-coding-system-used))
+                             buffer-file-coding-system)))
         (context (epg-make-context))
         (coding-system-for-write 'binary)
         string entry)
@@ -127,19 +152,21 @@
      context
      (cons #'epa-file-passphrase-callback-function
           file))
+    (epg-context-set-progress-callback context
+                                      #'epa-progress-callback-function)
     (condition-case error
        (setq string
              (epg-encrypt-string
               context
               (if (stringp start)
                   (encode-coding-string start coding-system)
-                (encode-coding-string (buffer-string) coding-system))
-              (mapcar (lambda (key)
-                        (epg-sub-key-id (car (epg-key-sub-key-list key))))
-                      (unless (assoc file epa-file-passphrase-alist)
-                        (epa-select-keys
-                   "Select recipents for encryption.
-If no one is selected, symmetric encryption will be performed.  ")))))
+                (encode-coding-string (buffer-substring start end)
+                                      coding-system))
+              (unless (assoc file epa-file-passphrase-alist)
+                (epa-select-keys
+                 context
+                 "Select recipents for encryption.
+If no one is selected, symmetric encryption will be performed.  "))))
       (error
        (if (setq entry (assoc file epa-file-passphrase-alist))
           (setcdr entry nil))