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9e797c1b17
This is actually only part one, i.e. with this commit if the user adds a PacketExtension to an IQ it will be included in IQ.toXml(). Which was previously only the case if the IQ subclass explicitly included packet extensions. The second part of the change is to change the IQ provider, so that packet extensions are automatically parsed. Cases where PacketExtensions are used for Message and IQ are slightly changed. The IQ sublcass now only has a field with this PacketExtension (see for example bytestreams.ibb.packet.DataPacketExtension). Also changed hoxt API: Removed unnecessary indirection and made the API more Smack idiomatic.
109 lines
3.3 KiB
Markdown
109 lines
3.3 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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// 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 = new HttpOverXmppReq(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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// add to
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req.setTo("juliet@capulet.com/balcony");
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// send it
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connection.sendIqWithResponseCallback(req, new PacketListener() {
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public void processPacket(Packet packet) {
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HttpOverXmppResp resp = (HttpOverXmppResp) iq;
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// check HTTP response code
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if (resp.getStatusCode() == 200) {
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// get content of the response
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NamedElement child = resp.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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