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;;; jabber-vcard-avatars.el --- Avatars by JEP-0153 -*- lexical-binding: t; -*-
;; Copyright (C) 2006, 2007, 2008 Magnus Henoch
;; Author: Magnus Henoch <mange@freemail.hu>
;; This file 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 2, or (at your option)
;; any later version.
;; This file 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:
;;
;;; Code:
(require 'jabber-util)
(require 'jabber-xml)
(require 'jabber-vcard)
(require 'jabber-presence)
(require 'jabber-iq)
(require 'jabber-avatar)
(defcustom jabber-vcard-avatars-retrieve (and (fboundp 'display-images-p)
(display-images-p))
"Automatically download vCard avatars?"
:group 'jabber-avatar
:type 'boolean)
(defcustom jabber-vcard-avatars-publish t
"Publish your vCard photo as avatar?"
:group 'jabber-avatar
:type 'boolean)
(defvar jabber-vcard-avatars-current-hash
(make-hash-table :test 'equal)
"For each connection, SHA1 hash of current avatar.
Keys are full JIDs.")
(add-to-list 'jabber-presence-chain 'jabber-vcard-avatars-presence)
(defun jabber-vcard-avatars-presence (jc xml-data)
"Look for vCard avatar mark in <presence/> stanza.
JC is the Jabber connection.
XML-DATA is the parsed tree data from the stream (stanzas)
obtained from `xml-parse-region'."
;; Only look at ordinary presence
(when (and jabber-vcard-avatars-retrieve
(null (jabber-xml-get-attribute xml-data 'type)))
(let* ((from (jabber-jid-user (jabber-xml-get-attribute xml-data 'from)))
(photo (jabber-xml-path xml-data '(("vcard-temp:x:update" . "x") photo)))
(sha1-hash (car (jabber-xml-node-children photo))))
(cond
((null sha1-hash)
;; User has removed avatar
(jabber-avatar-set from nil))
((string= sha1-hash (get (jabber-jid-symbol from) 'avatar-hash))
;; Same avatar as before; do nothing
)
((jabber-avatar-find-cached sha1-hash)
;; Avatar is cached
(jabber-avatar-set from sha1-hash))
(t
;; Avatar is not cached; retrieve it
(jabber-vcard-avatars-fetch jc from sha1-hash))))))
(defun jabber-vcard-avatars-fetch (jc jid sha1-hash)
"Fetch vCard for JID and extract the avatar.
JC is the Jabber connection."
(interactive (list (jabber-read-account)
(jabber-read-jid-completing "Fetch whose vCard avatar: ")
nil))
(jabber-send-iq jc jid "get" '(vCard ((xmlns . "vcard-temp")))
#'jabber-vcard-avatars-vcard (cons jid sha1-hash)
#'ignore nil))
(defun jabber-vcard-avatars-vcard (_jc iq closure)
"Get the photo from the vCard, and set the avatar."
(let ((from (car closure))
(sha1-hash (cdr closure))
(photo (assq 'PHOTO (jabber-vcard-parse (jabber-iq-query iq)))))
(if photo
(let ((avatar (jabber-avatar-from-base64-string (nth 2 photo)
(nth 1 photo))))
(unless (or (null sha1-hash)
(string= sha1-hash (avatar-sha1-sum avatar)))
(when jabber-avatar-verbose
(message "%s's avatar should have SHA1 sum %s, but has %s"
(jabber-jid-displayname from)
sha1-hash
(avatar-sha1-sum avatar))))
(jabber-avatar-cache avatar)
(jabber-avatar-set from avatar))
(jabber-avatar-set from nil))))
(defun jabber-vcard-avatars-find-current (jc)
"Request our own vCard, to find hash of avatar.
JC is the Jabber connection."
(when jabber-vcard-avatars-publish
(jabber-send-iq jc nil "get" '(vCard ((xmlns . "vcard-temp")))
#'jabber-vcard-avatars-find-current-1 t
#'jabber-vcard-avatars-find-current-1 nil)))
(defun jabber-vcard-avatars-find-current-1 (jc xml-data success)
(jabber-vcard-avatars-update-current
jc
(and success
(let ((photo (assq 'PHOTO (jabber-vcard-parse (jabber-iq-query xml-data)))))
(when photo
(let ((avatar (jabber-avatar-from-base64-string (nth 2 photo)
(nth 1 photo))))
(avatar-sha1-sum avatar)))))))
(defun jabber-vcard-avatars-update-current (jc new-hash)
(let ((old-hash (gethash
(jabber-connection-bare-jid jc)
jabber-vcard-avatars-current-hash)))
(when (not (string= old-hash new-hash))
(puthash (jabber-connection-bare-jid jc)
new-hash jabber-vcard-avatars-current-hash)
(jabber-send-current-presence jc))))
(add-to-list 'jabber-presence-element-functions 'jabber-vcard-avatars-presence-element)
(defun jabber-vcard-avatars-presence-element (jc)
(when jabber-vcard-avatars-publish
(let ((hash (gethash
(jabber-connection-bare-jid jc)
jabber-vcard-avatars-current-hash)))
(list
`(x ((xmlns . "vcard-temp:x:update"))
;; if "not yet ready to advertise image", don't.
;; that is, we haven't yet checked what avatar we have.
,(when hash
`(photo () ,hash)))))))
(provide 'jabber-vcard-avatars)
;;; jabber-vcard-avatars.el ends here
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