在OpenFire中刷新VCard [英] Refreshing VCards in OpenFire
问题描述
我为OpenFire XMPP服务器开发了一个VCard插件，其主要目的是通过HTTP请求创建/更新和检索用户的头像.不幸的是，该插件无法按预期方式工作-VCard更改已传播到数据库(ofVcard表)中，但是用户图片已更新的用户或他的好友都看不到刷新的图像.这是我创建/更新VCard的方法:
I developed a VCard plugin for OpenFire XMPP server with the main purpose of creating/updating and retrieving users' avatars via HTTP requests. Unfortunately, the plugin does not work as expected - VCard changes are propogated into the database (ofVcard table), but neither the user whose userpic was updated nor his buddies see the refreshed image. Here is how I create/update the VCards:
...
XMPPServer server = XMPPServer.getInstance();
VCardManager vcardManager = server.getVCardManager();
public void createOrUpdateVcard(String username, String vcard)
throws Exception {
SAXReader reader = new SAXReader();
reader.setValidation(false);
// convert String into InputStream
InputStream is = new ByteArrayInputStream(vcard.getBytes());
// read it with BufferedReader
BufferedReader br = new BufferedReader(new InputStreamReader(is));
try {
// Reading malformed XML will lead to DocumentException
Document document = reader.read(is);
Element vCardElement = document.getRootElement();
log.info("Username: " + username);
vcardManager.setVCard(username, vCardElement);
} catch (DocumentException e) {
throw new MalformedXmlException(e);
}
}
...
当我直接从客户端(我们使用Jitsi)更改化身时，更改不仅立即存储在数据库中，而且所有伙伴都获得了刷新的图像.我看到我使用的VCardManager在内部调度事件:
When I change avatars directly from the client (we are using Jitsi), the changes are not only immediately stored in the database, but all the buddies get the refreshed image. I see that VCardManager, which I use, dispatches events internally:
VCardEventDispatcher.dispatchVCardUpdated(username, newvCard);
但它们似乎没有任何作用.
but they seem not to have any effect.
我无法弄清楚从IQvCardHandler中的handleIQ(IQ packet)中调用setVcard方法的方式与我自己的代码之间有什么区别.我想念什么?
I cannot figure out what is the difference between the way the setVcard method is called from the handleIQ(IQ packet) in IQvCardHandler and in my own code. What am I missing?
推荐答案
好，我自己回答我的问题-也许有人会觉得此信息有用.
Ok, I will answer my question myself - maybe someone would find this info helpful.
事实证明，这并不像将图片存储到数据库中那么简单.预计相关各方之间将进行消息交换.此交换的关键部分是客户端发送的状态更新，该更新将通知服务器，并因此通知其所有伙伴有关其新个人资料图像的信息.有关更多详细信息，请参考 XEP-0153:基于vCard的头像</a>.这是一段代码，模拟"状态更新，该更新将发送给所有用户的好友:
It turned out to be not as simple as just storing a picture into a database. There is a message exchange, expected to happen between the involved parties. The crucial part of this exchange is that there is a presence update, sent by the client, which informs the server and consequently all his buddies about his new profile image. Please refer to XEP-0153: vCard-Based Avatars for further details. This is the piece of code, that "emulates" the presence update which will be sent to all of the user's buddies:
public void createOrUpdateVcard(String username, String vcard)
throws MalformedXmlException, UserNotFoundException, SetVcardException {
SAXReader reader = new SAXReader();
reader.setValidation(false);
InputStream is = new ByteArrayInputStream(vcard.getBytes());
try {
// Reading malformed XML will lead to DocumentException
Document document = reader.read(is);
Element vCardElement = document.getRootElement();
//Checking that the user exists
User user = userManager.getUser(username);
//This might be redundant
String userUsername = user.getUsername();
log.debug("Setting VCard for " + userUsername);
//Storing vCard into the database
VCardManager.getInstance().setVCard(userUsername, vCardElement);
Presence presence = new Presence();
JID userJID = server.createJID(username, null);
presence.setFrom(userJID);
presence.setStatus("");
presence.setPriority(30);
Element xElement = presence.addChildElement("x", "vcard-temp:x:update");
Element photoElement = xElement.addElement("photo");
SecureRandom random = new SecureRandom();
//We do not care about the actual hash - just push updates every time
String fakeHash = new BigInteger(130, random).toString(32);
photoElement.setText(fakeHash);
Element cElement = presence.addChildElement("c", "http://jabber.org/protocol/caps");
cElement.addAttribute( "ext", "voice-v1 video-v1 camera-v1" )
.addAttribute("hash", "sha-1");
System.out.println("SENDING PRESENCE UPDATE:\n" + presence.toXML());
broadcastUpdate(presence);
} catch (DocumentException e) {
throw new MalformedXmlException(e);
}catch (UserNotFoundException e){
throw new UserNotFoundException();
} catch (Exception e){
//Unfortunately setVCard method above just throws Exception.
//This catch block is for wrapping it up
throw new SetVcardException();
}
}
这是PresenceUpdateHandler类中经过稍微调整的方法:
This is a slightly adjusted method from the PresenceUpdateHandler class:
private void broadcastUpdate(Presence update) {
if (update.getFrom() == null) {
return;
}
if (localServer.isLocal(update.getFrom())) {
// Do nothing if roster service is disabled
if (!RosterManager.isRosterServiceEnabled()) {
return;
}
// Local updates can simply run through the roster of the local user
String name = update.getFrom().getNode();
try {
if (name != null && !"".equals(name)) {
Roster roster = rosterManager.getRoster(name);
roster.broadcastPresence(update);
}
}
catch (UserNotFoundException e) {
log.warn("Presence being sent from unknown user " + name, e);
}
catch (PacketException e) {
log.error(LocaleUtils.getLocalizedString("admin.error"), e);
}
}
else {
// Foreign updates will do a reverse lookup of entries in rosters
// on the server
log.warn("Presence requested from server "
+ localServer.getServerInfo().getXMPPDomain()
+ " by unknown user: " + update.getFrom());
}
}
对于调试OpenFire问题，我强烈建议以调试模式在本地运行它-请参见此处的说明: 2 .请注意，较新的Eclipse版本没有从现有来源创建项目的功能，但是您必须单击新建"->"Java项目"，取消选中使用默认位置"复选框并浏览到项目位置.
For debugging OpenFire issues I would strongly recommend running it locally in debug mode - see instructions here: 2. Be aware, that newer eclipse releases do not have Create project from existing source, but you have to click on New -> Java Project, untick the Use default location check box and Browse to the project location.
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