[JDEV] Subscribe / Unsubscribe users

[David Waite]

No problem - while the Roster lists the current subscription status of
your users, you cannot subscribe or unsubscribe using it (both the
subscription type and the current asking state are read-only).

To add or remove users, user presence:

<psuedocode>
PresenceBuilder presBuilder=new PresenceBuilder();
presBuilder.setToAddr(jidOfOtherUser);
presBuilder.setType("subscribe");
try
{
Packet p=presBuilder.build()
}
...appropriate error catching...
connection.send(p);


This builds a <presence type="subscribe" to="whoever at wherever"/>

The response back should be a 'subscribed' message. If the user is
unable to answer or defers answering, the 'ask' field in the roster
marks that the subscription request is still outstanding and waiting.

see more details at http://docs.jabber.org/jpg/

-David Waite

Leon Kwan wrote:
> 
> Hello all genius,
> 
> I met great problem in subscribing and unsubscribing users
> when using jabberbeans API.
> 
> Below is the code of subscribe and unsubscribe.
> 
> In subscribe method, I found that I can put the the
> subscribed name to the xml of the user profile but I
> cannot set the waiting state type to "subscribe".
> In the packet listener, I can see the packet sent
> contains this attribute of "waiting state type".
> So what is the proper procedure of adding a user?
> 
> Moreover, exception occurs when request the roster list if
> one of the roster element is "ask=subscribe". How should
> I handle it?
> 
> Unsubscribe is worse. Although I found that the packet
> sent contains attribute of "waiting state type" and also
> the "subscription type", nothing in the xml of the
> user profile is changed.
> 
>  public boolean subscribe(String username)
>  {
>   RosterItemBuilder rib=new RosterItemBuilder();
>   rib.setJID(createJID(username));
>   rib.setSubscriptionType("both");
>   rib.setWaitingStateType("subscribe");
>   rib.setFriendlyName(username);
> 
>   InfoQueryBuilder iqbuild = new InfoQueryBuilder();
> 
>   RosterItem ri;
>   try
>   {
>    ri = (RosterItem) rib.build();
>    RosterExtensionBuilder reb = new RosterExtensionBuilder();
>    reb.addRosterItem(ri);
>    reb.setIQRoster(true);
>    iqbuild.reset();
>    iqbuild.setType("set");
>    iqbuild.addExtension(reb.build());
>       //build and send presence
>       connection.send(iqbuild.build());
>   }
>   catch (InstantiationException e)
>   {
>    e.printStackTrace(System.err);
>       return false;
>   }
>   return true;
>  }
> 
> 
> 
>  public boolean remove(String username)
>  {
>   RosterItemBuilder rib=new RosterItemBuilder();
>   rib.setJID(createJID(username));
>   rib.setSubscriptionType("both");
>   rib.setWaitingStateType("unsubscribe");
>   rib.setFriendlyName(username);
> 
>   InfoQueryBuilder iqbuild = new InfoQueryBuilder();
> 
>   RosterItem ri;
>   try
>   {
>    ri = (RosterItem) rib.build();
>    RosterExtensionBuilder reb = new RosterExtensionBuilder();
>    reb.addRosterItem(ri);
>    reb.setIQRoster(true);
>    iqbuild.reset();
>    iqbuild.setType("set");
>    iqbuild.addExtension(reb.build());
>       //build and send presence
>       connection.send(iqbuild.build());
>   }
>   catch (InstantiationException e)
>   {
>    e.printStackTrace(System.err);
>       return false;
>   }
>   return true;
>  }
> 
> 
> -Leon Kwan
> 
> 
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