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+;;; rudel-zeroconf.el --- Zeroconf support for Rudel
+;;
+;; Copyright (C) 2008, 2009 Jan Moringen
+;;
+;; Author: Jan Moringen <scymtym@users.sourceforge.net>
+;; Keywords: Rudel, service, discovery, advertising, zeroconf,
+;;           rendezvous, avahi
+;; X-RCS: $Id:$
+;;
+;; This file is part of Rudel.
+;;
+;; Rudel 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.
+;;
+;; Rudel 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 Rudel. If not, see <http://www.gnu.org/licenses>.
+
+
+;;; Commentary:
+;;
+;; Zeroconf session discovery and advertising for Rudel. The main
+;; class `rudel-zeroconf-backend' implements discovery and advertising
+;; for registered service types. Service types are registered by
+;; adding an element of the form (SERVICE BACKEND) to the
+;; `rudel-zeroconf-service-types'. BACKEND is the symbol of the
+;; protocol backend and SERVICE is the string used as service type in
+;; the Zeroconf record (example: '("_lobby._tcp" obby)).
+
+
+;;; History:
+;;
+;; 0.1 - Initial revision.
+
+
+;;; Code:
+;;
+
+(eval-when-compile
+  (require 'cl)) ;; first, second
+
+(require 'zeroconf)
+
+(require 'rudel-backend)
+(require 'rudel-session-initiation)
+
+
+;;; Constants and global variables
+;;
+
+(defconst rudel-zeroconf-version '(0 1)
+  "Version of the Zeroconf backend for Rudel.")
+
+(defvar rudel-zeroconf-service-types nil
+  "Service types used by Rudel backends.
+Each element is of the form (SERVICE BACKEND).")
+
+
+;;; Accessors and manipulators for the service list
+;;
+
+(defalias 'rudel-zeroconf-service-type 'first
+  "Return type of service.")
+
+(defalias 'rudel-zeroconf-service-backend 'second
+  "Return backend associated with service type.")
+
+(defun rudel-zeroconf-service (key which)
+  "Return the Zeroconf service type used by BACKEND."
+  (find which rudel-zeroconf-service-types
+	:key key :test (if (eq key 'rudel-zeroconf-service-type)
+			   #'string= #'eq)))
+
+;;;###autoload
+(defun rudel-zeroconf-register-service (type backend)
+  "Add an entry for TYPE with BACKEND to the list of service types.
+BACKEND is the name of the protocol backend handling the service
+type TYPE."
+  (push (list type backend)
+	rudel-zeroconf-service-types))
+
+
+;;; Initialization
+;;
+
+(message "Initializing Zeroconf ...")
+(zeroconf-init)
+
+
+;;; Class rudel-zeroconf-backend
+;;
+
+;;;###autoload
+(defclass rudel-zeroconf-backend (rudel-session-initiation-backend)
+  ((capabilities :initform (discover advertise))
+   (priority     :initform primary))
+  "")
+
+(defmethod initialize-instance ((this rudel-zeroconf-backend) &rest slots)
+  "Initialize slots of THIS with SLOTS."
+  (when (next-method-p)
+    (call-next-method))
+
+  (oset this :version rudel-zeroconf-version))
+
+(defmethod rudel-discover ((this rudel-zeroconf-backend))
+  "Return a list of session information property lists for Zeroconf-advertised sessions."
+  (mapcar
+   #'rudel-zeroconf-service->plist
+   (remove-if
+    #'null
+    (mapcar
+     #'zeroconf-resolve-service
+     (apply
+      #'append
+      (mapcar
+       #'rudel-zeroconf-services
+       (mapcar #'rudel-zeroconf-service-backend
+	       rudel-zeroconf-service-types))))))
+  )
+
+(defmethod rudel-advertise ((this rudel-session-initiation-backend) info)
+  "Use Zeroconf to advertise the session described by INFO to other users."
+  (let ((name    (plist-get info :name))
+	(backend (plist-get info :backend))
+	(host    (plist-get info :host))
+	(port    (plist-get info :port))
+	(data    (plist-get info :data)))
+    (when backend
+      (apply #'rudel-zeroconf-publish
+	     backend name host port data)))
+  t)
+
+(defmethod rudel-withdraw ((this rudel-session-initiation-backend))
+  "Withdraw Zeroconf record."
+  (error "Not implemented, yet"))
+
+
+;;; Zeroconf wrapper functions
+;;
+
+(defun rudel-zeroconf-services (backend)
+  "List Zeroconf services for BACKEND."
+  (zeroconf-list-services
+   (rudel-zeroconf-service-type
+    (rudel-zeroconf-service
+     #'rudel-zeroconf-service-backend backend))))
+
+(defun rudel-zeroconf-services-present-p (backend)
+  "Check whether there are Zeroconf services for BACKEND."
+  (rudel-zeroconf-services backend))
+
+(defun rudel-zeroconf-publish (backend name host port &rest data)
+  "Publish BACKEND service NAME for HOST and PORT."
+  ;; Try to find the service entry for the protocol backend and
+  ;; publish the service if an entry is found.
+  (let ((service (rudel-zeroconf-service
+		  #'rudel-zeroconf-service-backend backend)))
+    (when service
+      (zeroconf-publish-service
+       name
+       (rudel-zeroconf-service-type service)
+       "local"
+       (concat host ".local")
+       port
+       "" ; address
+       (mapcar
+	(lambda (item)
+	  (concat (car item) "=" (cdr item)))
+	data)
+       )))
+  )
+
+(defun rudel-zeroconf-withdraw (backend name)
+  "Withdraw service NAME for BACKEND."
+  (error "Not implemented, yet"))
+
+
+;;; Miscellaneous functions
+;;
+
+(defun rudel-zeroconf-service->plist (service)
+  "Convert a Zeroconf service record to an info property list."
+  (let* ((type         (zeroconf-service-type service))
+	 (data         (rudel-zeroconf-parse-txt-record
+			(zeroconf-service-txt service)))
+	 (service-type (rudel-zeroconf-service
+			#'rudel-zeroconf-service-type type)))
+    ;; Construct information property list.
+    (list
+     :name       (format "Zeroconf advertised session \"%s\""
+			 (zeroconf-service-name service))
+     :backend    (rudel-backend-get
+		  'protocol
+		  (rudel-zeroconf-service-backend service-type))
+     :host       (zeroconf-service-host service)
+     :port       (zeroconf-service-port service)
+     ;; Encryption defaults to yes to be compatible with Gobby.
+     :encryption (or (not (member :encryption data))
+		     (string= (plist-get data :encryption)
+			      "yes"))))
+  )
+
+(defun rudel-zeroconf-parse-txt-record (record)
+  "Parse RECORD into a property list of keys and values."
+  (apply #'append
+	 (mapcar
+	  (lambda (entry)
+	    (multiple-value-bind (key value) (split-string entry "=")
+	      (list (intern (concat ":" key))
+		    value)))
+	  record))
+  )
+
+
+;;; User interaction
+;;
+
+(defun rudel-zeroconf-read-service (backend)
+  "Retrieve services for BACKEND and read one from user."
+  ;; First, find all matching services for the backend.
+  (let* ((services         (rudel-zeroconf-services backend))
+	 ;; Read one of the names of these services.
+	 (service-name     (completing-read
+			    "Service: "
+			    (mapcar #'zeroconf-service-name services)
+			    nil t))
+	 ;; Retrieve and resolve the selected service object.
+	 (service          (find service-name services
+				 :key  #'zeroconf-service-name
+				 :test #'string=))
+	 (service-resolved (zeroconf-resolve-service service)))
+    ;; Return host and port
+    (list (zeroconf-service-host service-resolved)
+	  (zeroconf-service-port service-resolved)))
+  )
+
+
+;;; Autoloading
+;;
+
+;;;###autoload
+(rudel-add-backend (rudel-backend-get-factory 'session-initiation)
+		   'zeroconf 'rudel-zeroconf-backend)
+
+(provide 'rudel-zeroconf)
+;;; rudel-zeroconf.el ends here