"The EasyPG Assistant hooks for transparent file encryption"
:group 'epa)
-(defcustom epa-file-name-regexp "\\.gpg\\'"
- "Regexp which matches filenames to be encrypted with GnuPG."
+(defun epa-file--file-name-regexp-set (variable value)
+ (set-default variable value)
+ (if (fboundp 'epa-file-name-regexp-update)
+ (epa-file-name-regexp-update)))
+
+(defcustom epa-file-name-regexp "\\.gpg\\(~\\|\\.~[0-9]+~\\)?\\'"
+ "Regexp which matches filenames to be encrypted with GnuPG.
+
+If you set this outside Custom while epa-file is already enabled, you
+have to call `epa-file-name-regexp-update' after setting it to
+properly update file-name-handler-alist. Setting this through Custom
+does that automatically."
:type 'regexp
- :group 'epa-file)
+ :group 'epa-file
+ :set 'epa-file--file-name-regexp-set)
(defcustom epa-file-cache-passphrase-for-symmetric-encryption nil
- "If t, cache passphrase for symmetric encryption."
+ "If non-nil, cache passphrase for symmetric encryption."
+ :type 'boolean
+ :group 'epa-file)
+
+(defcustom epa-file-inhibit-auto-save t
+ "If non-nil, disable auto-saving when opening an encrypted file."
+ :type 'boolean
+ :group 'epa-file)
+
+(defcustom epa-file-select-keys nil
+ "If non-nil, always asks user to select recipients."
:type 'boolean
:group 'epa-file)
val)
t)))))
+;;;###autoload
+(put 'epa-file-encrypt-to 'permanent-local t)
+
(defvar epa-file-handler
(cons epa-file-name-regexp 'epa-file-handler))
(defvar epa-file-passphrase-alist nil)
-(if (fboundp 'encode-coding-string)
- (defalias 'epa-file--encode-coding-string 'encode-coding-string)
- (defalias 'epa-file--encode-coding-string 'identity))
+(eval-and-compile
+ (if (fboundp 'encode-coding-string)
+ (defalias 'epa-file--encode-coding-string 'encode-coding-string)
+ (defalias 'epa-file--encode-coding-string 'identity)))
-(if (fboundp 'decode-coding-string)
- (defalias 'epa-file--decode-coding-string 'decode-coding-string)
- (defalias 'epa-file--decode-coding-string 'identity))
+(eval-and-compile
+ (if (fboundp 'decode-coding-string)
+ (defalias 'epa-file--decode-coding-string 'decode-coding-string)
+ (defalias 'epa-file--decode-coding-string 'identity)))
+
+(defun epa-file-name-regexp-update ()
+ (interactive)
+ (unless (equal (car epa-file-handler) epa-file-name-regexp)
+ (setcar epa-file-handler epa-file-name-regexp)))
(defun epa-file-passphrase-callback-function (context key-id file)
(if (and epa-file-cache-passphrase-for-symmetric-encryption
(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))
- string length entry)
+ (let* ((local-copy
+ (condition-case inl
+ (epa-file-run-real-handler #'file-local-copy (list file))
+ (error)))
+ (local-file (or local-copy file))
+ (context (epg-make-context))
+ string length entry)
(if visit
(setq buffer-file-name file))
(epg-context-set-passphrase-callback
context
(cons #'epa-file-passphrase-callback-function
- file))
+ local-file))
(epg-context-set-progress-callback context
#'epa-progress-callback-function)
(unwind-protect
(if replace
(goto-char (point-min)))
(condition-case error
- (setq string (epg-decrypt-file context file nil))
+ (setq string (epg-decrypt-file context local-file nil))
(error
(if (setq entry (assoc file epa-file-passphrase-alist))
(setcdr entry nil))
(signal 'file-error
(cons "Opening input file" (cdr error)))))
+ (make-local-variable 'epa-file-encrypt-to)
+ (setq epa-file-encrypt-to
+ (mapcar #'car (epg-context-result-for context 'encrypted-to)))
(if (or beg end)
(setq string (substring string (or beg 0) end)))
(save-excursion
buffer-file-coding-system)))
(context (epg-make-context))
(coding-system-for-write 'binary)
- string entry)
+ string entry
+ (recipients
+ (cond
+ ((listp epa-file-encrypt-to) epa-file-encrypt-to)
+ ((stringp epa-file-encrypt-to) (list epa-file-encrypt-to)))))
(epg-context-set-passphrase-callback
context
(cons #'epa-file-passphrase-callback-function
file))
(epg-context-set-progress-callback context
#'epa-progress-callback-function)
+ (epg-context-set-armor context epa-armor)
(condition-case error
(setq string
(epg-encrypt-string
(epa-file--encode-coding-string start coding-system)
(epa-file--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 (or epa-file-select-keys
+ (not (local-variable-p 'epa-file-encrypt-to
+ (current-buffer))))
+ (epa-select-keys
+ context
+ "Select recipents for encryption.
If no one is selected, symmetric encryption will be performed. "
- (cond
- ((listp epa-file-encrypt-to) epa-file-encrypt-to)
- ((stringp epa-file-encrypt-to) (list epa-file-encrypt-to)))))))
+ recipients)
+ (if epa-file-encrypt-to
+ (epg-list-keys context recipients)))))
(error
(if (setq entry (assoc file epa-file-passphrase-alist))
(setcdr entry nil))
(message "Wrote %s" buffer-file-name))))
(put 'write-region 'epa-file 'epa-file-write-region)
+(defun epa-file-find-file-hook ()
+ (if (and buffer-file-name
+ (string-match epa-file-name-regexp buffer-file-name)
+ epa-file-inhibit-auto-save)
+ (auto-save-mode 0))
+ (set-buffer-modified-p nil))
+
+(defun epa-file-select-keys ()
+ "Select recipients for encryption."
+ (interactive)
+ (make-local-variable 'epa-file-encrypt-to)
+ (setq epa-file-encrypt-to
+ (epa-select-keys
+ (epg-make-context)
+ "Select recipents for encryption.
+If no one is selected, symmetric encryption will be performed. ")))
+
;;;###autoload
(defun epa-file-enable ()
(interactive)
(message "`epa-file' already enabled")
(setq file-name-handler-alist
(cons epa-file-handler file-name-handler-alist))
+ (add-hook 'find-file-hooks 'epa-file-find-file-hook)
(message "`epa-file' enabled")))
;;;###autoload
(progn
(setq file-name-handler-alist
(delq epa-file-handler file-name-handler-alist))
+ (remove-hook 'find-file-hooks 'epa-file-find-file-hook)
(message "`epa-file' disabled"))
(message "`epa-file' already disabled")))
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