ios - XMPPFramework - XEP-0048 : Bookmark Storage

Question

在我的应用中，我实现了创建 XMPPRoom 和邀请用户。现在，我正在寻找一种方法来存储这些组(我创建的组或我受邀加入的组)，以便我可以在需要时轻松地将其检索回我的应用程序。我遇到了 XEP-0048 书签，但是，我找不到任何在线使用它的示例。有人用过这个吗？能否分享一些示例？

http://www.xmpp.org/extensions/attic/xep-0048-1.0.html

艾哈迈德

Answer 1

根据 XEP-0048: Bookmarks , 要将书签上传到服务器，您必须像这样发送一个 iq 请求:

<iq from='juliet@capulet.lit/balcony' type='set' id='pip1'>
  <pubsub xmlns='http://jabber.org/protocol/pubsub'>
    <publish node='storage:bookmarks'>
      <item id='current'>
        <storage xmlns='storage:bookmarks'>
          <conference name='The Play&apos;s the Thing' 
                      autojoin='true'
                      jid='theplay@conference.shakespeare.lit'>
            <nick>JC</nick>
          </conference>
        </storage>
      </item>
    </publish>
    <publish-options>
      <x xmlns='jabber:x:data' type='submit'>
        <field var='FORM_TYPE' type='hidden'>
          <value>http://jabber.org/protocol/pubsub#publish-options</value>
        </field>
        <field var='pubsub#persist_items'>
          <value>true</value>
        </field>
        <field var='pubsub#access_model'>
          <value>whitelist</value>
        </field>
      </x>
    </publish-options>
  </pubsub>
</iq>

在使用 NSXMLElement 类的 Objective-C 中，上面的 XML 可以这样写:

    NSXMLElement *pubsub = [[NSXMLElement alloc] initWithName:@"pubsub" xmlns:@"http://jabber.org/protocol/pubsub"];
    NSXMLElement *publish = [[NSXMLElement alloc] initWithName:@"publish"];
    [publish addAttributeWithName:@"node" stringValue:@"storage:bookmarks"];
    NSXMLElement *item = [[NSXMLElement alloc] initWithName:@"item"];
    [item addAttributeWithName:@"id" stringValue:@"current"];
    NSXMLElement *storage = [[NSXMLElement alloc] initWithName:@"storage" xmlns:@"storage:bookmarks"];
    NSXMLElement *conference = [[NSXMLElement alloc] initWithName:@"conference"];
    [conference addAttributeWithName:@"name" stringValue:@"The Play's the Thing"];
    [conference addAttributeWithName:@"autojoin" stringValue:@"true"];
    [conference addAttributeWithName:@"jid" stringValue:@"theplay@conference.shakespeare.lit"];
    NSXMLElement *nick = [[NSXMLElement alloc] initWithName:@"nick" stringValue:@"JC"];
    [conference addChild:nick];
    [storage addChild:conference];
    [item addChild:storage];
    [publish addChild:item];

    NSXMLElement *publish_options = [[NSXMLElement alloc] initWithName:@"publish-options"];
    NSXMLElement *x = [[NSXMLElement alloc] initWithName:@"x" xmlns:@"jabber:x:data"];
    [x addAttributeWithName:@"type" stringValue:@"submit"];
    NSXMLElement *field1 = [[NSXMLElement alloc] initWithName:@"field"];
    [field1 addAttributeWithName:@"var" stringValue:@"FORM_TYPE"];
    [field1 addAttributeWithName:@"type" stringValue:@"hidden"];
    NSXMLElement *value1 = [[NSXMLElement alloc] initWithName:@"value" stringValue:@"http://jabber.org/protocol/pubsub#publish-options"];
    [field1 addChild:value1];
    [x addChild:field1];
    NSXMLElement *field2 = [[NSXMLElement alloc] initWithName:@"field"];
    [field2 addAttributeWithName:@"var" stringValue:@"pubsub#persist_items"];
    NSXMLElement *value2 = [[NSXMLElement alloc] initWithName:@"value" stringValue:@"whitelist"];
    [field2 addChild:value2];
    [x addChild:field2];
    [publish_options addChild:x];

    [pubsub addChild:publish];
    [pubsub addChild:publish_options];

    XMPPIQ *iq = [[XMPPIQ alloc] initWithType:@"set" child:pubsub];
    [iq addAttributeWithName:@"from" stringValue:@"juliet@capulet.lit/balcony"];
    [iq addAttributeWithName:@"id" stringValue:@"pip1"];

当然也可以只用一个NSXMLElement来写，比如

NSXMLElement *iq = [NSXMLElement alloc] initWithName:@"iq" stringValue:[NSString stringWithFormat:@"all xml code from first paragraph with %@ to add your dynamic data...", data1, data2, ...];
[iq addAttributeWithName:@"from" stringValue:@"juliet@capulet.lit/balcony"];
[iq addAttributeWithName:@"id" stringValue:@"pip1"];

创建 iq 后，是时候将它发送到服务器了

[xmppStream sendElement:iq];

这是将书签发送到服务器的方式。您在 XMPPStream 委托(delegate) - (BOOL)xmppStream:(XMPPStream *)sender didReceiveIQ:(XMPPIQ *)iq 中监听服务器响应，服务器响应应该是这样的:

<iq to='juliet@capulet.lit/balcony' type='result' id='pip1'/>

或者在 objective-c 代码中:

- (BOOL)xmppStream:(XMPPStream *)sender didReceiveIQ:(XMPPIQ *)iq
{
    if([iq isResultIQ])
    {
        if([[iq attributeStringValueForName:@"id"] isEqualToString:@"pip1"])
        {
            NSLog(@"Bookmarks with id %@ succesfully uploaded", [iq attributeStringValueForName:@"id"]);
        }
    }
}

现在，基于上面的示例，为 clinet 从服务器(XEP-0048: Bookmarks 3.3 Retrieving Data)请求书签的 xml 创建 objective-c 代码:

<iq from='juliet@capulet.lit/randomID' type='get' id='retrieve1'>
  <pubsub xmlns='http://jabber.org/protocol/pubsub'>
    <items node='storage:bookmarks'/>
  </pubsub>
</iq>

objective-c 代码:

NSXMLElement *pubsub = [[NSXMLElement alloc] initWithName:@"pubsub" xmlns:@"http://jabber.org/protocol/pubsub"];
NSXMLElement *items = [[NSXMLElement alloc] initWithName:@"items"];
[items addAttributeWithName:@"node" stringValue:@"storage:bookmarks"];
[pubsub addChild:items];

XMPPIQ *iq = [[XMPPIQ alloc] initWithType:@"get" child:pubsub];
[iq addAttributeWithName:@"from" stringValue:@"juliet@capulet.lit/balcony"];
[iq addAttributeWithName:@"id" stringValue:@"retrive1"];

像以前一样发送到服务器:

[xmppStream sendElement:iq];

并像以前一样监听服务器响应:

<iq type='result'
    to='juliet@capulet.lit/randomID'
    id='retrieve1'>
  <pubsub xmlns='http://jabber.org/protocol/pubsub'>
    <items node='storage:bookmarks'>
      <item id='current'>
        <storage xmlns='storage:bookmarks'>
          <conference name='The Play&apos;s the Thing' 
                      autojoin='true'
                      jid='theplay@conference.shakespeare.lit'>
            <nick>JC</nick>
          </conference>
        </storage>
      </item>
    </items>
  </pubsub>
</iq>

或 objective-c 代码:

- (BOOL)xmppStream:(XMPPStream *)sender didReceiveIQ:(XMPPIQ *)iq
{

    if([iq isResultIQ])
    {
        if([[iq attributeStringValueForName:@"id"] isEqualToString:@"retrive1"])
        {
            NSXMLElement *pubsub = [iq elementForName:@"pubsub"];
            NSArray *items = [pubsub elementsForName:@"items"];

            NSLog(@"Bookmarks for id %@ are: %@", [iq attributeStringValueForName:@"id"], items);
        }
    }
}