bug#8772: [PATCH] rcirc: support TLS/SSL and arbitrary connection method

[Marco Pessotto]

>From emacs-devel:

Hello there.

I'm writing you to submit a patch for rcirc.el to give it support for
SSL connections. 

For example, the following 2 servers will connect with SSL, one using a
custom function (which can be anything, and re-implements this idea
https://github.com/nealey/rcirc/wiki ), one simply adding :use-tls t.

(setq rcirc-server-alist '(("irc.freenode.net" 
                            :nick "nick"
                            :user-name "username"
                            :port 6697
                            ;; use open-tls-stream as function to connect
                            :custom-connect-function open-tls-stream 
                            :channels ("#rcirc" "#emacs"))
                           ("irc.otherserver.org" 
                            :nick "nick"
                            :username "username"
                            ;; just say use-tls, more intuitive
                            ;; also prompted when C-u M-x rcirc
                            :use-tls t
                            :port 7000
                            :channels ("#channel1" "#channel 2"))))


The last 2 chunks of the patch are meant to strip the IRC colors. Not
really part of the "connection" patch, but IMHO useful.

The patch is meant to be applied to the latest revision published on
github by rcy:

https://github.com/rcy/rcirc

In case you're interested, I signed the emacs papers some years ago.

Bests

        Marco

diff --git a/rcirc.el b/rcirc.el
index 093892a..a0bcaf1 100644
--- a/rcirc.el
+++ b/rcirc.el
@@ -46,6 +46,7 @@
 (require 'ring)
 (require 'time-date)
 (eval-when-compile (require 'cl))
+(require 'tls)
 
 (defgroup rcirc nil
   "Simple IRC client."
@@ -76,6 +77,19 @@ for this connection.
 VALUE must be a number or string.  If absent,
 `rcirc-default-port' is used.
 
+`:use-tls'
+
+VALUE is a boolean. If true, the connection will be established
+using the tls.el library. If absent, `rcirc-default-use-tls' is
+used, which in turn default to nil (false).
+
+`:custom-connect-function'
+
+VALUE is a custom function to open the connection and must take
+the same arguments of `open-network-stream' If you set this,
+the :use-tls parameter is ignored (as you are supposed to set the
+connection by yourself)
+
 `:user-name'
 
 VALUE must be a string.  If absent, `rcirc-default-user-name' is
@@ -102,6 +116,8 @@ connected to automatically."
                                             (:user-name string)
                                             (:password string)
                                             (:full-name string)
+                                            (:use-tls boolean)
+                                            (:custom-connect-function function)
                                             (:channels (repeat string)))))
   :group 'rcirc)
 
@@ -110,6 +126,11 @@ connected to automatically."
   :type 'integer
   :group 'rcirc)
 
+(defcustom rcirc-default-use-tls nil
+  "Use SSL/TLS by default?"
+  :type 'boolean
+  :group 'rcirc)
+
 (defcustom rcirc-default-nick (user-login-name)
   "Your nick."
   :type 'string
@@ -409,6 +430,7 @@ If ARG is non-nil, instead prompt for connection 
parameters."
                                      'rcirc-user-name-history))
             (password (read-passwd "IRC Password: " nil
                                     (plist-get server-plist :password)))
+            (use-tls (yes-or-no-p "Use SSL/TLS? "))
             (channels (split-string
                        (read-string "IRC Channels: "
                                     (mapconcat 'identity
@@ -418,7 +440,7 @@ If ARG is non-nil, instead prompt for connection 
parameters."
                        "[, ]+" t)))
        (rcirc-connect server port nick user-name
                       rcirc-default-full-name
-                      channels password))
+                      channels password use-tls))
     ;; connect to servers in `rcirc-server-alist'
     (let (connected-servers)
       (dolist (c rcirc-server-alist)
@@ -430,6 +452,9 @@ If ARG is non-nil, instead prompt for connection 
parameters."
              (full-name (or (plist-get (cdr c) :full-name)
                             rcirc-default-full-name))
              (channels (plist-get (cdr c) :channels))
+             (use-tls (or (plist-get (cdr c) :use-tls)
+                      rcirc-default-use-tls))
+             (custom-connect-function (plist-get (cdr c) 
:custom-connect-function))
               (password (plist-get (cdr c) :password)))
          (when server
            (let (connected)
@@ -439,13 +464,15 @@ If ARG is non-nil, instead prompt for connection 
parameters."
              (if (not connected)
                  (condition-case e
                      (rcirc-connect server port nick user-name
-                                    full-name channels password)
+                                    full-name channels password use-tls
+                                    custom-connect-function)
                    (quit (message "Quit connecting to %s" server)))
                (with-current-buffer (process-buffer connected)
+                 (if (process-contact (get-buffer-process
+                                       (current-buffer)) :host)
                  (setq connected-servers
-                       (cons (process-contact (get-buffer-process
-                                               (current-buffer)) :host)
-                             connected-servers))))))))
+                       (cons (process-name connected)
+                             connected-servers)))))))))
       (when connected-servers
        (message "Already connected to %s"
                 (if (cdr connected-servers)
@@ -471,7 +498,8 @@ If ARG is non-nil, instead prompt for connection 
parameters."
 
 ;;;###autoload
 (defun rcirc-connect (server &optional port nick user-name
-                             full-name startup-channels password)
+                             full-name startup-channels password use-tls
+                            custom-connect-function)
   (save-excursion
     (message "Connecting to %s..." server)
     (let* ((inhibit-eol-conversion)
@@ -484,7 +512,16 @@ If ARG is non-nil, instead prompt for connection 
parameters."
           (user-name (or user-name rcirc-default-user-name))
           (full-name (or full-name rcirc-default-full-name))
           (startup-channels startup-channels)
-           (process (make-network-process :name server :host server :service 
port-number)))
+           (process))
+      (if (functionp custom-connect-function)
+         (setq process (funcall custom-connect-function server nil server 
port-number))
+       (if use-tls
+           (setq process (open-tls-stream server nil server port-number))
+         (setq process (open-network-stream server nil server port-number))))
+      (unless process
+       (error (concat 
+              (format "Couldn't connect to %s on %d " server port-number)
+              (when use-tls "using TLS/SSL"))))
       ;; set up process
       (set-process-coding-system process 'raw-text 'raw-text)
       (switch-to-buffer (rcirc-generate-new-buffer-name process nil))
@@ -698,7 +735,7 @@ Function is called with PROCESS, COMMAND, SENDER, ARGS and 
LINE.")
   "Send PROCESS a STRING plus a newline."
   (let ((string (concat (encode-coding-string string 
rcirc-encode-coding-system)
                         "\n")))
-    (unless (eq (process-status process) 'open)
+    (unless (member (process-status process) '(open run))
       (error "Network connection to %s is not open"
              (process-name process)))
     (rcirc-debug process string)
@@ -1401,7 +1438,8 @@ Returns nil if the information is not recorded."
       (- rcirc-current-line last-activity-line))))
 
 (defvar rcirc-markup-text-functions
-  '(rcirc-markup-attributes
+  '(rcirc-markup-strip-irc-colors
+    rcirc-markup-attributes
     rcirc-markup-my-nick
     rcirc-markup-urls
     rcirc-markup-keywords
@@ -2302,6 +2340,10 @@ keywords when no KEYWORD is given."
   (insert (rcirc-facify (format-time-string rcirc-time-format)
                        'rcirc-timestamp)))
 
+(defun rcirc-markup-strip-irc-colors (sender response)
+  (while (re-search-forward "\C-c\\([0-9][0-9]?\\(,[0-9][0-9]?\\)?\\)?" nil t)
+    (delete-region (match-beginning 0) (match-end 0))))
+
 (defun rcirc-markup-attributes (sender response)
   (while (re-search-forward "\\([\C-b\C-_\C-v]\\).*?\\(\\1\\|\C-o\\)" nil t)
     (rcirc-add-face (match-beginning 0) (match-end 0)


-- 
Marco