X-Git-Url: http://git.chise.org/gitweb/?a=blobdiff_plain;f=epa-file.el;h=86af182ee2955c67a5e7376103e8c287011ea18b;hb=f0cf0f951e5534b14c3a798424ff6fdc40ad39a8;hp=202ccdfa0453dad9ab3335d5496c434b4339f712;hpb=3108e5ea8d6bb54dd79688a9369067b54b1af4f7;p=elisp%2Fepg.git diff --git a/epa-file.el b/epa-file.el index 202ccdf..86af182 100644 --- a/epa-file.el +++ b/epa-file.el @@ -33,77 +33,155 @@ "Regexp which matches filenames to be encrypted with GnuPG." :type 'regexp :group 'epa-file) + +(defvar epa-file-handler + (cons epa-file-name-regexp 'epa-file-handler)) -(defvar epa-file nil) -(defvar epa-passphrase nil) - -(defun epa-file-passphrase-callback-function (key-id buffer) - (save-excursion - (set-buffer buffer) - (if (and (eq key-id 'SYM) - epa-file) - (or epa-passphrase - (let ((passphrase (epg-passphrase-callback-function - key-id buffer))) - (setq epa-passphrase (copy-sequence passphrase)) - passphrase)) - (epg-passphrase-callback-function key-id buffer)))) +(defvar epa-file-passphrase-alist nil) + +(defun epa-file-passphrase-callback-function (file) + (if (eq epg-key-id 'SYM) + (let ((entry (assoc file epa-file-passphrase-alist)) + passphrase) + (or (copy-sequence (cdr entry)) + (progn + (unless entry + (setq entry (list file) + epa-file-passphrase-alist (cons entry + epa-file-passphrase-alist))) + (setq passphrase (epg-passphrase-callback-function nil)) + (setcdr entry (copy-sequence passphrase)) + passphrase))) + (epg-passphrase-callback-function nil))) + +(defun epa-file-handler (operation &rest args) + (save-match-data + (let ((op (get operation 'epa-file))) + (if op + (apply op args) + (epa-file-run-real-handler operation args))))) + +(defun epa-file-run-real-handler (operation args) + (let ((inhibit-file-name-handlers + (cons 'epa-file-handler + (and (eq inhibit-file-name-operation operation) + inhibit-file-name-handlers))) + (inhibit-file-name-operation operation)) + (apply operation args))) (defvar last-coding-system-used) -(defun epa-find-file () - (when (string-match epa-file-name-regexp (buffer-file-name)) - (when (file-exists-p (expand-file-name (buffer-file-name))) - (if (fboundp 'set-buffer-multibyte) - (set-buffer-multibyte t)) - (goto-char (point-min)) - (let ((context (epg-make-context))) - (epg-context-set-passphrase-callback - context - (cons #'epa-file-passphrase-callback-function - (current-buffer))) - (insert (epg-decrypt-file context - (expand-file-name (buffer-file-name)) - nil))) - (delete-region (point) (point-max)) - (decode-coding-region (point-min) (point-max) 'undecided) - (if (boundp 'last-coding-system-used) - (set-buffer-file-coding-system last-coding-system-used)) - (set-auto-mode) - (hack-local-variables) - (auto-save-mode nil) - (set-buffer-modified-p nil) - (setq buffer-undo-list nil)) - (make-local-variable 'epa-file) - (setq epa-file (buffer-file-name)) - (make-local-variable 'epa-passphrase))) - -(defun epa-write-file () - (when epa-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)) - (coding-system-for-write 'binary) - (context (epg-make-context))) - (epg-context-set-passphrase-callback - context - (cons #'epa-file-passphrase-callback-function - (current-buffer))) - (write-region - (epg-encrypt-string - context - (encode-coding-string (buffer-string) coding-system) - (mapcar (lambda (key) - (epg-sub-key-id (car (epg-key-sub-key-list key)))) - (unless epa-passphrase - (epa-select-keys - "Select recipents for encryption. -If no one is selected, symmetric encryption will be performed. ")))) - nil (expand-file-name (buffer-file-name)))) - (set-visited-file-modtime) - (set-buffer-modified-p nil) - t)) +(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.")) + (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) + (if visit + (setq buffer-file-name file)) + (epg-context-set-passphrase-callback + context + (cons #'epa-file-passphrase-callback-function + file)) + (unwind-protect + (progn + (if replace + (goto-char (point-min))) + (condition-case error + (setq string (decode-coding-string + (epg-decrypt-file context file nil) + 'undecided)) + (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 (and local-copy + (file-exists-p local-copy)) + (delete-file local-copy))) + (list file length))) +(put 'insert-file-contents 'epa-file 'epa-file-insert-file-contents) + +(defun epa-file-write-region (start end file &optional append visit lockname + mustbenew) + (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)) + (context (epg-make-context)) + (coding-system-for-write 'binary) + string entry) + (epg-context-set-passphrase-callback + context + (cons #'epa-file-passphrase-callback-function + file)) + (condition-case error + (setq string + (epg-encrypt-string + context + (if (stringp start) + (encode-coding-string start coding-system) + (encode-coding-string (buffer-substring start end) + 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. "))))) + (error + (if (setq entry (assoc file epa-file-passphrase-alist)) + (setcdr entry nil)) + (signal 'file-error (cons "Opening output file" (cdr error))))) + (epa-file-run-real-handler + #'write-region + (list string nil file append visit lockname mustbenew)) + (if (boundp 'last-coding-system-used) + (setq last-coding-system-used coding-system)) + (if (eq visit t) + (progn + (setq buffer-file-name file) + (set-visited-file-modtime)) + (if (stringp visit) + (progn + (set-visited-file-modtime) + (setq buffer-file-name visit)))) + (if (or (eq visit t) + (eq visit nil) + (stringp visit)) + (message "Wrote %s" buffer-file-name)))) +(put 'write-region 'epa-file 'epa-file-write-region) + +;;;###autoload +(defun epa-file-enable () + (interactive) + (if (memq epa-file-handler file-name-handler-alist) + (message "`epa-file' already enabled") + (setq file-name-handler-alist + (cons epa-file-handler file-name-handler-alist)) + (message "`epa-file' enabled"))) + +;;;###autoload +(defun epa-file-disable () + (interactive) + (if (memq epa-file-handler file-name-handler-alist) + (progn + (setq file-name-handler-alist + (delq epa-file-handler file-name-handler-alist)) + (message "`epa-file' disabled")) + (message "`epa-file' already disabled"))) (provide 'epa-file)