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137 lines
4 KiB
Markdown
137 lines
4 KiB
Markdown
HTTP over XMPP transport
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========================
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Allows to transport HTTP communication over XMPP peer-to-peer networks.
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* Discover HOXT support
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* IQ exchange
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Discover HOXT support
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---------------------
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**Description**
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Before using this extension you must ensure that your counterpart supports it
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also.
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**Usage**
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Once you have your _**ServiceDiscoveryManager**_ you will be able to discover
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information associated with an XMPP entity. To discover the information of a
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given XMPP entity send **discoverInfo(entityID)** to your
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_**ServiceDiscoveryManager**_ where entityID is the ID of the entity. The
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message **discoverInfo(entityID)** will answer an instance of
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_**DiscoverInfo**_ that contains the discovered information.
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**Examples**
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In this example we can see how to check if the counterpart supports HOXT:
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```
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// Obtain the ServiceDiscoveryManager associated with my XMPPConnection
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ServiceDiscoveryManager discoManager = ServiceDiscoveryManager.getInstanceFor(connection);
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// Get the information of a given XMPP entity
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DiscoverInfo discoInfo = discoManager.discoverInfo("juliet@capulet.com");
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// Check if room is HOXT is supported
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discoInfo.containsFeature("urn:xmpp:http");
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```
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IQ exchange
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-----------
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**Description**
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You can use IQ's to perform HTTP requests and responses. This is applicable to
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relatively short requests and responses (due to limitation of XMPP message
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size).
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**Usage**
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First you need to register a _**PacketListener**_ to be able to handle
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intended IQs.
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For the HTTP client you:
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* You create and send _**HttpOverXmppReq**_ request.
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* Then you handle the _**HttpOverXmppResp**_ response in your _**PacketListener**_.
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For the HTTP server you:
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* You handle the _**HttpOverXmppReq**_ requests in your _**PacketListener**_.
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* And create and send _**HttpOverXmppResp**_ responses.
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**Examples**
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In this example we are HTTP client, so we send request (POST) and handle the
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response:
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```
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// register listener for IQ packets
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connection.addPacketListener(new IqPacketListener(), new PacketTypeFilter(IQ.class));
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// create a request body
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String urlEncodedMessage = "I_love_you";
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// create request
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HttpOverXmppReq.Req req = new HttpOverXmppReq.Req(HttpMethod.POST, "/mailbox");
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req.setVersion("1.1");
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// prepare headers
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Set<Header> set = new HashSet<Header>();
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set.add(new Header("Host", "juliet.capulet.com"));
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set.add(new Header("Content-Type", "application/x-www-form- urlencoded"));
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set.add(new Header("Content-Length", Integer.toString(urlEncodedMessage.length())));
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req.setHeaders(new HeadersExtension(set));
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// provide body or request (not mandatory, - empty body is used for GET)
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AbstractHttpOverXmpp.Text child = new AbstractHttpOverXmpp.Text(urlEncodedMessage);
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AbstractHttpOverXmpp.Data data = new AbstractHttpOverXmpp.Data(child);
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req.setData(data);
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// create IQ packet
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HttpOverXmppReq packet = new HttpOverXmppReq();
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packet.setReq(req);
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packet.setTo("juliet@capulet.com/balcony");
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packet.setType(IQ.Type.SET);
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packet.setPacketID("42");
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// send it
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connection.sendPacket(packet);
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// then in your PacketListener
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private class IqPacketListener implements PacketListener {
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@Override
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public void processPacket(Packet packet) {
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IQ iq = (IQ) packet;
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// verify from and packed ID
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if (iq.getFrom().equals("juliet@capulet.com/balcony") && (iq.getPacketID().equals("42"))) {
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// ensure it's not ERROR
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if (iq.getType().equals(IQ.Type.RESULT)) {
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// check if correct IQ implementation arrived
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if (iq instanceof HttpOverXmppResp) {
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HttpOverXmppResp resp = (HttpOverXmppResp) iq;
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// check HTTP response code
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if (resp.getResp().getStatusCode() == 200) {
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// get content of the response
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AbstractHttpOverXmpp.DataChild child = resp.getResp().getData().getChild();
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// check which type of content of the response arrived
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if (child instanceof AbstractHttpOverXmpp.Xml) {
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// print the message and anxiously read if from console ;)
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System.out.println(((AbstractHttpOverXmpp.Xml) child).getText());
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} else {
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// process other AbstractHttpOverXmpp.DataChild subtypes
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}
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}
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}
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}
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}
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}
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}
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```
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