[Emacs-diffs] Changes to hashcash.el

[Reiner Steib]

CVSROOT:        /cvsroot/emacs
Module name:    emacs
Changes by:     Reiner Steib <rsteib>   07/11/22 20:45:01

Index: hashcash.el
===================================================================
RCS file: hashcash.el
diff -N hashcash.el
--- hashcash.el 28 Oct 2007 09:18:29 -0000      1.1
+++ /dev/null   1 Jan 1970 00:00:00 -0000
@@ -1,370 +0,0 @@
-;;; hashcash.el --- Add hashcash payments to email
-
-;; Copyright (C) 2003, 2004, 2005, 2007 Free Software Foundation
-
-;; Written by: Paul Foley <address@hidden> (1997-2002)
-;; Maintainer: Paul Foley <address@hidden>
-;; Keywords: mail, hashcash
-
-;; This file is part of GNU Emacs.
-
-;; GNU Emacs is free software; you can redistribute it and/or modify
-;; it under the terms of the GNU General Public License as published by
-;; the Free Software Foundation; either version 3, or (at your option)
-;; any later version.
-
-;; GNU Emacs is distributed in the hope that it will be useful,
-;; but WITHOUT ANY WARRANTY; without even the implied warranty of
-;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.         See the
-;; GNU General Public License for more details.
-
-;; You should have received a copy of the GNU General Public License
-;; along with GNU Emacs; see the file COPYING.  If not, write to the
-;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
-;; Boston, MA 02110-1301, USA.
-
-;;; Commentary:
-
-;; The hashcash binary is at http://www.hashcash.org/.
-;;
-;; Call mail-add-payment to add a hashcash payment to a mail message
-;; in the current buffer.
-;;
-;; Call mail-add-payment-async after writing the addresses but before
-;; writing the mail to start calculating the hashcash payment
-;; asynchronously.
-;;
-;; The easiest way to do this automatically for all outgoing mail
-;; is to set `message-generate-hashcash' to t.  If you want more
-;; control, try the following hooks.
-;;
-;; To automatically add payments to all outgoing mail when sending:
-;;    (add-hook 'message-send-hook 'mail-add-payment)
-;;
-;; To start calculations automatically when addresses are prefilled:
-;;    (add-hook 'message-setup-hook 'mail-add-payment-async)
-;;
-;; To check whether calculations are done before sending:
-;;    (add-hook 'message-send-hook 'hashcash-wait-or-cancel)
-
-;;; Code:
-
-(defgroup hashcash nil
-  "Hashcash configuration."
-  :group 'mail)
-
-(defcustom hashcash-default-payment 20
-  "*The default number of bits to pay to unknown users.
-If this is zero, no payment header will be generated.
-See `hashcash-payment-alist'."
-  :type 'integer
-  :group 'hashcash)
-
-(defcustom hashcash-payment-alist '()
-  "*An association list mapping email addresses to payment amounts.
-Elements may consist of (ADDR AMOUNT) or (ADDR STRING AMOUNT), where
-ADDR is the email address of the intended recipient and AMOUNT is
-the value of hashcash payment to be made to that user.  STRING, if
-present, is the string to be hashed; if not present ADDR will be used."
-  :type '(repeat (choice (list :tag "Normal"
-                              (string :name "Address")
-                              (integer :name "Amount"))
-                        (list :tag "Replace hash input"
-                              (string :name "Address")
-                              (string :name "Hash input")
-                              (integer :name "Amount"))))
-  :group 'hashcash)
-
-(defcustom hashcash-default-accept-payment 20
-  "*The default minimum number of bits to accept on incoming payments."
-  :type 'integer
-  :group 'hashcash)
-
-(defcustom hashcash-accept-resources `((,user-mail-address nil))
-  "*An association list mapping hashcash resources to payment amounts.
-Resources named here are to be accepted in incoming payments.  If the
-corresponding AMOUNT is NIL, the value of `hashcash-default-accept-payment'
-is used instead."
-  :group 'hashcash)
-
-(defcustom hashcash-path (executable-find "hashcash")
-  "*The path to the hashcash binary."
-  :group 'hashcash)
-
-(defcustom hashcash-extra-generate-parameters nil
-  "*A list of parameter strings passed to `hashcash-path' when minting.
-For example, you may want to set this to '(\"-Z2\") to reduce header length."
-  :type '(repeat string)
-  :group 'hashcash)
-
-(defcustom hashcash-double-spend-database "hashcash.db"
-  "*The path to the double-spending database."
-  :group 'hashcash)
-
-(defcustom hashcash-in-news nil
-  "*Specifies whether or not hashcash payments should be made to newsgroups."
-  :type 'boolean
-  :group 'hashcash)
-
-(defvar hashcash-process-alist nil
-  "Alist of asynchronous hashcash processes and buffers.")
-
-(require 'mail-utils)
-
-(eval-and-compile
- (if (fboundp 'point-at-bol)
-     (defalias 'hashcash-point-at-bol 'point-at-bol)
-   (defalias 'hashcash-point-at-bol 'line-beginning-position))
-
- (if (fboundp 'point-at-eol)
-     (defalias 'hashcash-point-at-eol 'point-at-eol)
-   (defalias 'hashcash-point-at-eol 'line-end-position)))
-
-(defun hashcash-strip-quoted-names (addr)
-  (setq addr (mail-strip-quoted-names addr))
-  (if (and addr (string-match "\\`\\(address@hidden)address@hidden(@.+\\)" 
addr))
-      (concat (match-string 1 addr) (match-string 2 addr))
-    addr))
-
-(defun hashcash-token-substring ()
-  (save-excursion
-    (let ((token ""))
-      (loop
-       (setq token
-         (concat token (buffer-substring (point) (hashcash-point-at-eol))))
-       (goto-char (hashcash-point-at-eol))
-       (forward-char 1)
-       (unless (looking-at "[ \t]") (return token))
-       (while (looking-at "[ \t]") (forward-char 1))))))
-
-(defun hashcash-payment-required (addr)
-  "Return the hashcash payment value required for the given address."
-  (let ((val (assoc addr hashcash-payment-alist)))
-    (or (nth 2 val) (nth 1 val) hashcash-default-payment)))
-
-(defun hashcash-payment-to (addr)
-  "Return the string with which hashcash payments should collide."
-  (let ((val (assoc addr hashcash-payment-alist)))
-    (or (nth 1 val) (nth 0 val) addr)))
-
-(defun hashcash-generate-payment (str val)
-  "Generate a hashcash payment by finding a VAL-bit collison on STR."
-  (if (and (> val 0)
-          hashcash-path)
-      (save-excursion
-       (set-buffer (get-buffer-create " *hashcash*"))
-       (erase-buffer)
-       (apply 'call-process hashcash-path nil t nil
-              "-m" "-q" "-b" (number-to-string val) str
-              hashcash-extra-generate-parameters)
-       (goto-char (point-min))
-       (hashcash-token-substring))
-    (error "No `hashcash' binary found")))
-
-(defun hashcash-generate-payment-async (str val callback)
-  "Generate a hashcash payment by finding a VAL-bit collison on STR.
-Return immediately.  Call CALLBACK with process and result when ready."
-  (if (and (> val 0)
-          hashcash-path)
-      (let ((process (apply 'start-process "hashcash" nil
-                           hashcash-path "-m" "-q"
-                           "-b" (number-to-string val) str
-                           hashcash-extra-generate-parameters)))
-       (setq hashcash-process-alist (cons
-                                     (cons process (current-buffer))
-                                     hashcash-process-alist))
-       (set-process-filter process `(lambda (process output)
-                                      (funcall ,callback process output))))
-    (funcall callback nil nil)))
-
-(defun hashcash-check-payment (token str val)
-  "Check the validity of a hashcash payment."
-  (if hashcash-path
-      (zerop (call-process hashcash-path nil nil nil "-c"
-                          "-d" "-f" hashcash-double-spend-database
-                          "-b" (number-to-string val)
-                          "-r" str
-                          token))
-    (progn
-      (message "No hashcash binary found")
-      (sleep-for 1)
-      nil)))
-
-(defun hashcash-version (token)
-  "Find the format version of a hashcash token."
-  ;; Version 1.2 looks like n:yymmdd:rrrrr:xxxxxxxxxxxxxxxx
-  ;;   This carries its own version number embedded in the token,
-  ;;   so no further format number changes should be necessary
-  ;;   in the X-Payment header.
-  ;;
-  ;; Version 1.1 looks like yymmdd:rrrrr:xxxxxxxxxxxxxxxx
-  ;;   You need to upgrade your hashcash binary.
-  ;;
-  ;; Version 1.0 looked like nnnnnrrrrrxxxxxxxxxxxxxxxx
-  ;;   This is no longer supported.
-  (cond ((equal (aref token 1) ?:) 1.2)
-       ((equal (aref token 6) ?:) 1.1)
-       (t (error "Unknown hashcash format version"))))
-
-(defun hashcash-already-paid-p (recipient)
-  "Check for hashcash token to RECIPIENT in current buffer."
-  (save-excursion
-    (save-restriction
-      (message-narrow-to-headers-or-head)
-      (let ((token (message-fetch-field "x-hashcash"))
-           (case-fold-search t))
-       (and (stringp token)
-            (string-match (regexp-quote recipient) token))))))
-
-;;;###autoload
-(defun hashcash-insert-payment (arg)
-  "Insert X-Payment and X-Hashcash headers with a payment for ARG"
-  (interactive "sPay to: ")
-  (unless (hashcash-already-paid-p arg)
-    (let ((pay (hashcash-generate-payment (hashcash-payment-to arg)
-                                         (hashcash-payment-required arg))))
-      (when pay
-       (insert-before-markers "X-Hashcash: " pay "\n")))))
-
-;;;###autoload
-(defun hashcash-insert-payment-async (arg)
-  "Insert X-Payment and X-Hashcash headers with a payment for ARG
-Only start calculation.  Results are inserted when ready."
-  (interactive "sPay to: ")
-  (unless (hashcash-already-paid-p arg)
-    (hashcash-generate-payment-async
-     (hashcash-payment-to arg)
-     (hashcash-payment-required arg)
-     `(lambda (process payment)
-       (hashcash-insert-payment-async-2 ,(current-buffer) process payment)))))
-
-(defun hashcash-insert-payment-async-2 (buffer process pay)
-  (when (buffer-live-p buffer)
-    (with-current-buffer buffer
-      (save-excursion
-       (save-restriction
-         (setq hashcash-process-alist (delq
-                                       (assq process hashcash-process-alist)
-                                       hashcash-process-alist))
-         (message-goto-eoh)
-         (when pay
-           (insert-before-markers "X-Hashcash: " pay)))))))
-
-(defun hashcash-cancel-async (&optional buffer)
-  "Delete any hashcash processes associated with BUFFER.
-BUFFER defaults to the current buffer."
-  (interactive)
-  (unless buffer (setq buffer (current-buffer)))
-  (let (entry)
-    (while (setq entry (rassq buffer hashcash-process-alist))
-      (delete-process (car entry))
-      (setq hashcash-process-alist
-           (delq entry hashcash-process-alist)))))
-
-(defun hashcash-wait-async (&optional buffer)
-  "Wait for asynchronous hashcash processes in BUFFER to finish.
-BUFFER defaults to the current buffer."
-  (interactive)
-  (unless buffer (setq buffer (current-buffer)))
-  (let (entry)
-    (while (setq entry (rassq buffer hashcash-process-alist))
-      (accept-process-output (car entry)))))
-
-(defun hashcash-processes-running-p (buffer)
-  "Return non-nil if hashcash processes in BUFFER are still running."
-  (rassq buffer hashcash-process-alist))
-
-(defun hashcash-wait-or-cancel ()
-  "Ask user whether to wait for hashcash processes to finish."
-  (interactive)
-  (when (hashcash-processes-running-p (current-buffer))
-    (if (y-or-n-p 
-         "Hashcash process(es) still running; wait for them to finish? ")
-       (hashcash-wait-async)
-      (hashcash-cancel-async))))
-
-;;;###autoload
-(defun hashcash-verify-payment (token &optional resource amount)
-  "Verify a hashcash payment"
-  (let* ((split (split-string token ":"))
-        (key (if (< (hashcash-version token) 1.2)
-                 (nth 1 split)
-                 (case (string-to-number (nth 0 split))
-                   (0 (nth 2 split))
-                   (1 (nth 3 split))))))
-    (cond ((null resource)
-          (let ((elt (assoc key hashcash-accept-resources)))
-            (and elt (hashcash-check-payment token (car elt)
-                       (or (cadr elt) hashcash-default-accept-payment)))))
-         ((equal token key)
-          (hashcash-check-payment token resource
-                               (or amount hashcash-default-accept-payment)))
-         (t nil))))
-
-;;;###autoload
-(defun mail-add-payment (&optional arg async)
-  "Add X-Payment: and X-Hashcash: headers with a hashcash payment
-for each recipient address.  Prefix arg sets default payment temporarily.
-Set ASYNC to t to start asynchronous calculation.  (See
-`mail-add-payment-async')."
-  (interactive "P")
-  (let ((hashcash-default-payment (if arg (prefix-numeric-value arg)
-                                   hashcash-default-payment))
-       (addrlist nil))
-    (save-excursion
-      (save-restriction
-       (message-narrow-to-headers)
-       (let ((to (hashcash-strip-quoted-names (mail-fetch-field "To" nil t)))
-             (cc (hashcash-strip-quoted-names (mail-fetch-field "Cc" nil t)))
-             (ng (hashcash-strip-quoted-names (mail-fetch-field "Newsgroups"
-                                                                nil t))))
-         (when to
-           (setq addrlist (split-string to ",[ \t\n]*")))
-         (when cc
-           (setq addrlist (nconc addrlist (split-string cc ",[ \t\n]*"))))
-         (when (and hashcash-in-news ng)
-           (setq addrlist (nconc addrlist (split-string ng ",[ \t\n]*")))))
-       (when addrlist
-         (mapc (if async
-                   #'hashcash-insert-payment-async
-                 #'hashcash-insert-payment)
-               addrlist)))))
-  t)
-
-;;;###autoload
-(defun mail-add-payment-async (&optional arg)
-  "Add X-Payment: and X-Hashcash: headers with a hashcash payment
-for each recipient address.  Prefix arg sets default payment temporarily.
-Calculation is asynchronous."
-  (interactive "P")
-  (mail-add-payment arg t))
-
-;;;###autoload
-(defun mail-check-payment (&optional arg)
-  "Look for a valid X-Payment: or X-Hashcash: header.
-Prefix arg sets default accept amount temporarily."
-  (interactive "P")
-  (let ((hashcash-default-accept-payment (if arg (prefix-numeric-value arg)
-                                          hashcash-default-accept-payment))
-       (version (hashcash-version (hashcash-generate-payment "x" 1))))
-    (save-excursion
-      (goto-char (point-min))
-      (search-forward "\n\n")
-      (beginning-of-line)
-      (let ((end (point))
-           (ok nil))
-       (goto-char (point-min))
-       (while (and (not ok) (search-forward "X-Payment: hashcash " end t))
-         (let ((value (split-string (hashcash-token-substring) " ")))
-           (when (equal (car value) (number-to-string version))
-             (setq ok (hashcash-verify-payment (cadr value))))))
-       (goto-char (point-min))
-       (while (and (not ok) (search-forward "X-Hashcash: " end t))
-         (setq ok (hashcash-verify-payment (hashcash-token-substring))))
-       (when ok
-         (message "Payment valid"))
-       ok))))
-
-(provide 'hashcash)
-
-;;; arch-tag: 0e7fe983-a124-4392-9788-0dbcbd2c4d62