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+;; erc-sasl.el -- handle SASL PLAIN authentication
+
+;; Copyright (C) 2012 Joseph Gay
+
+;; Author: Joseph Gay <[email protected]>
+;; Keywords: comm
+
+;; This file is NOT 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 of the License, 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.  If not, see <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;; This file implements SASL PLAIN authentication
+;; To activate:
+;;
+;; (require 'erc-sasl)
+;;
+;; (add-to-list 'erc-sasl-server-regexp-list "host\\.server\\.com")
+;; e.g. irc\\.freenode\\.net, or .* for any host
+;;
+;; To disable:
+;; (setq erc-sasl-use-sasl nil)
+;;
+;; NOTE: requires passing a password initially to (erc) and variants
+
+;;; Code:
+
+(eval-when-compile (require 'cl))
+
+(defvar erc-sasl-use-sasl t
+  "Set to nil to disable SASL auth")
+
+(defvar erc-sasl-server-regexp-list '()
+  "List of regexps matching server host names for which sasl
+  should be used")
+
+(defun erc-sasl-use-sasl-p ()
+  "Used internally to decide whether SASL should be used in the
+current session"
+  (and erc-sasl-use-sasl
+       (boundp 'erc-session-server)
+       (cl-loop for re in erc-sasl-server-regexp-list
+             thereis (integerp (string-match re erc-session-server)))))
+
+(define-erc-response-handler (CAP)
+  "Client capability framework is used to request SASL auth, need
+  to wait for ACK to begin" nil
+  (let ((msg (erc-response.contents parsed)))
+    (when (string-match " *sasl" msg)
+      (erc-server-send "AUTHENTICATE PLAIN")
+      ;; now wait for AUTHENTICATE +
+      )))
+
+(define-erc-response-handler (AUTHENTICATE)
+  "Handling empty server response indicating ready to receive
+  authentication." nil
+  (if erc-session-password
+      (let ((msg (erc-response.contents parsed)))
+        (when (string= "+" msg)
+          ;; plain auth
+          (erc-server-send
+           (format "AUTHENTICATE %s"
+                   (base64-encode-string
+                    (concat "\0" (erc-current-nick)
+                            "\0" erc-session-password) t)))))
+    (progn
+      (erc-display-message
+       parsed 'error
+       (if erc-server-connected 'active proc)
+       "You must set a password in order to use SASL authentication.")
+      ;; aborting SASL auth
+      (erc-server-send (erc-server-send "AUTHENTICATE *")))))
+
+(define-erc-response-handler (903)
+  "Handling a successful SASL authentication." nil
+  (erc-server-send "CAP END"))
+
+(provide 'erc-sasl)
+
+;; ;;; erc-sasl.el ends here
+;; ;; Local Variables:
+;; ;; indent-tabs-mode: nil
+;; ;; End: