3 (defcustom epg-file-name-regexp "\\.gpg\\'"
4 "Regexp that matches filenames that are assumed to be encrypted
9 (defun epg-file-handler (operation &rest args)
10 (let ((epg-file-operation (get operation 'epg-file)))
11 (if epg-file-operation
12 (apply epg-file-operation args)
13 (epg-file-run-real-handler operation args))))
15 (defun epg-file-run-real-handler (operation args)
16 (let ((inhibit-file-name-handlers
17 (cons 'epg-file-handler
18 (and (eq inhibit-file-name-operation operation)
19 inhibit-file-name-handlers)))
20 (inhibit-file-name-operation operation))
21 (apply operation args)))
23 (defvar buffer-file-type)
24 (defvar last-coding-system-used)
25 (defun epg-file-write-region (start end filename &optional append visit
27 (let* ((visit-file (if (stringp visit)
28 (expand-file-name visit)
29 (expand-file-name filename)))
30 ;; XXX: Obtain the value returned by choose_write_coding_system
31 (coding-system (condition-case nil
32 (epg-file-run-real-handler
33 'write-region (list start end "/"))
34 (file-error (if (boundp 'last-coding-system-used)
35 last-coding-system-used
36 buffer-file-coding-system))))
37 ;; start and end are normally buffer positions
38 ;; specifying the part of the buffer to write.
39 ;; If start is nil, that means to use the entire buffer contents.
40 ;; If start is a string, then output that string to the file
41 ;; instead of any buffer contents; end is ignored.
42 (string (encode-coding-string (cond
48 (buffer-substring start end)))
51 (if (fboundp 'set-buffer-multibyte)
52 (set-buffer-multibyte nil))
53 ;; Optional fourth argument append if non-nil means
54 ;; append to existing file contents (if any). If it is an integer,
55 ;; seek to that offset in the file before writing.
56 (if (and append (file-exists-p filename))
57 ;; Enable passphrase cache on this temp buffer
58 (let ((coding-system-for-read 'binary))
59 ;; set visit to t so that passphrase is cached
60 (insert-file-contents filename t)
61 (setq buffer-file-name nil)))
62 ;; Insert data to encrypt
63 (goto-char (if (integerp append) (1+ append) (point-max)))
64 (delete-region (point) (min (+ (point) (length string)) (point-max)))
67 (let ((coding-system-for-write 'binary)
68 (coding-system-for-read 'binary)
69 (context (epg-make-context))
71 (when (setq cipher (epg-encrypt-string context (buffer-string) nil))
72 (if (and (memq system-type '(ms-dos windows-nt))
73 (boundp 'buffer-file-type))
74 (setq buffer-file-type t))
75 (epg-file-run-real-handler
77 (list cipher nil filename nil 'not-visit lockname mustbenew)))))
78 ;; Optional fifth argument visit, if t or a string, means
79 ;; set the last-save-file-modtime of buffer to this file's modtime
80 ;; and mark buffer not modified.
81 ;; If visit is a string, it is a second file name;
82 ;; the output goes to filename, but the buffer is marked as visiting visit.
83 ;; visit is also the file name to lock and unlock for clash detection.
84 ;; If visit is neither t nor nil nor a string,
85 ;; that means do not display the "Wrote file" message.
86 (when (or (eq visit t) (stringp visit))
87 (setq buffer-file-name filename)
88 (set-visited-file-modtime))
90 (setq buffer-file-name visit))
91 (when (or (eq visit t) (eq visit nil) (stringp visit))
92 (message "Wrote %s" visit-file))
93 (if (boundp 'last-coding-system-used)
94 (setq last-coding-system-used coding-system))
97 (defun epg-file-insert-file-contents (filename &optional visit beg end replace)
98 (barf-if-buffer-read-only)
99 (setq filename (expand-file-name filename))
100 (let ((filename (expand-file-name filename))
102 (if (file-exists-p filename)
104 (let ((inhibit-file-name-operation
105 (when (eq inhibit-file-name-operation
106 'insert-file-contents)
108 (file-local-copy filename)))
109 (coding-system-for-read 'binary)
110 (context (epg-make-context))
114 (setq string (epg-decrypt-file context (or local-file
116 length (length string))
118 (goto-char (point-min)))
120 (let ((buffer-file-name (if visit nil buffer-file-name)))
122 (narrow-to-region (point) (point))
123 (insert (decode-coding-string string 'undecided)))
125 (delete-region (point) (point-max))))))
126 (when (and local-file (file-exists-p local-file))
127 (delete-file local-file)))))
128 ;; If second argument visit is non-nil, the buffer's visited filename
129 ;; and last save file modtime are set, and it is marked unmodified.
132 (setq buffer-file-name filename)
133 (set-visited-file-modtime))
135 ;; If visiting and the file does not exist, visiting is completed
136 ;; before the error is signaled.
137 (if (and visit (not (file-exists-p filename)))
138 (signal 'file-error (list "Opening input file" filename)))
140 ;; Returns list of absolute file name and number of characters inserted.
141 (list filename length)))
143 (put 'write-region 'epg-file 'epg-file-write-region)
144 (put 'insert-file-contents 'epg-file 'epg-file-insert-file-contents)
146 (unless (assoc epg-file-name-regexp file-name-handler-alist)
147 (setq file-name-handler-alist
148 (cons (cons epg-file-name-regexp 'epg-file-handler)
149 file-name-handler-alist)))
151 (unless (assoc epg-file-name-regexp auto-mode-alist)
152 (setq auto-mode-alist
153 (cons (list epg-file-name-regexp nil 'strip-suffix)
158 ;;; epg-file.el ends here