Android aSmack - How to make custom message extension for file sending?

Question

Android aSmack - How to make custom message extension for file sending?

1.2k views Asked by Sushant At 13 June 2015 at 06:08

I'm trying to implement offline file extension for my chat application. I'm using PacketExtension and EmbeddedExtensionProvider for adding and parsing custom extension. I can see that values and tags are added while sending message, but at receiver end these are absent. What i'm doing wrong ?

Sending message:

<message id="224K2-7" to="testfirzan@sushant" type="chat">
    <body>hi</body>
    <custom xmlns="jabber2:x2:oob2">
      <url>URL</url>
      <desc>Description</desc>
    </custom>
</message>

Receiving message:

System.out(734): EmbeddedExtensionProvider

<message id="224K2-7" to="testfirzan@sushant" from="testsushant@sushant/Smack" type="chat">
    <body>hi</body>
    <custom xmlns="jabber2:x2:oob2"></custom>
</message>

File Extension description:(734): <custom xmlns="jabber2:x2:oob2"></custom>

Packet extension and provider manager code:

public class FileExtension implements PacketExtension {

public static final String ELEMENT = "custom";
public static final String NAMESPACE = "jabber2:x2:oob2";

String description;
String url;

@Override
public String getElementName() {
    return "custom";
}

@Override
public String getNamespace() {
    return "jabber2:x2:oob2";
}

@Override
public String toXML() {

    StringBuilder builder = new StringBuilder();
    builder.append("<" + getElementName() + " xmlns=\"" + getNamespace()
            + "\">");
    if (url != null) {
        builder.append("<url>").append(url).append("</url>");
    }
    if (description != null) {
        builder.append("<desc>").append(description).append("</desc>");
    }
    builder.append("</" + getElementName() + ">");
    return builder.toString();
}

public String getDescription() {
    return description;
}

public void setDescription(String description) {
    this.description = description;
}

public String getUrl() {
    return url;
}

public void setUrl(String imageUrl) {
    this.url = imageUrl;
}

public static class FileExtensionProvider extends EmbeddedExtensionProvider {

    @Override
    protected PacketExtension createReturnExtension(String currentElement,
            String currentNamespace, Map<String, String> attributeMap,
            List<? extends PacketExtension> content) {

        System.out.println("EmbeddedExtensionProvider");
        return new FileExtension();
    }
}
}

Registering provider :

ProviderManager.getInstance().addExtensionProvider(
            FileExtension.ELEMENT, FileExtension.NAMESPACE,
            new FileExtension.FileExtensionProvider());

While sending message :

FileExtension fileExt = new FileExtension("URL");
    fileExt.setDescription("Description");
    fileExt.setUrl("URL");

    msg.addExtension(fileExt);

After receiving message :

FileExtension fileExt = (FileExtension) message
                            .getExtension("jabber2:x2:oob2");

                    Log.i("File Extension description:", fileExt.toXML());

Original Q&A

There are 2 answers

Vikram On 28 June 2016 at 17:45

In latest version of Smack 4.1.7, PacketExtensionProvider is removed (see this). So ExtensionProviderFile can be created after extending ExtensionElementProvider. Please check below code -

public class ExtensionProviderFile extends ExtensionElementProvider {

    @Override
    public Element parse(XmlPullParser parser, int initialDepth) throws XmlPullParserException, IOException, SmackException {

        ChatExtension extensionFile = new ChatExtension();

        int eventType = parser.next();

        while (eventType == XmlPullParser.START_TAG){
            String name = parser.getName();

            switch (parser.getEventType()) {

                case XmlPullParser.START_TAG:

                    if (name.equals("fileName")) {
                        extensionFile.setFileName(parser.nextText());
                    }

                    else if (name.equals("fullName")) {
                        extensionFile.setFullName(parser.nextText());
                    }

            }

            eventType = parser.next();
        }

        return extensionFile;
    }
}

Hope this will help someone.

**Sushant** · Accepted Answer · 2015-12-15 12:00:26

Following is the complete solution for making custom extension with aSmack:

1st i had to create PacketExtension:

public class ExtensionFile implements PacketExtension {

    public static final String ELEMENT = "file";
    public static final String NAMESPACE = "file:namespace";

    private String fileURL;
    private String fileSize;

    @Override
    public String getElementName() {
        return ELEMENT;
    }

    @Override
    public String getNamespace() {
        return NAMESPACE;
    }

    @Override
    public String toXML() {

        StringBuilder builder = new StringBuilder();
        builder.append("<" + getElementName() + " xmlns=\"" + getNamespace()
            + "\">");
        if (fileURL != null) {
            builder.append("<fileURL>").append(fileURL).append("</fileURL>");
        }
        if (fileSize != null) {
            builder.append("<fileSize>").append(fileSize).append("</fileSize>");
        }
        builder.append("</" + getElementName() + ">");
        return builder.toString();
    }

    public void setFileURL(String fileURL) {
        this.fileURL = fileURL;
    }

    public String getFileURL() {
        return fileURL;
    }

    public void setFileSize(String fileSize) {
        this.fileSize = fileSize;
    }

    public String getFileSize() {
        return fileSize;
    }
}

Then provider to parse this packet:

public class ExtensionProviderFile implements PacketExtensionProvider {

@Override
public PacketExtension parseExtension(XmlPullParser parser)
        throws Exception {

    ExtensionFile fileExt = new ExtensionFile();

    int eventType = parser.next();

    while (eventType == XmlPullParser.START_TAG) {

        String name = parser.getName();

        switch (parser.getEventType()) {

            case XmlPullParser.START_TAG:
                if (name.equals("fileURL")) {

                    fileExt.setFileURL(parser.nextText());
                } else if (name.equals("fileSize")) {

                    fileExt.setFileSize(parser.nextText());
                }
        }

        eventType = parser.next();
    }

    return fileExt;
}
}

Sending message with file extension:

private void sendMessage(String recipient, String message){

    Message msg = new Message(recipient,Message.Type.chat);
    msg.setBody(message);

    //Create extension and set values
    ExtensionFile fileExt = new ExtensionFile();
    fileExt.setFileURL("http://www.example.com/upload_files/"+ abc.jpg);
    fileExt.setFileSize(fileSize);

    //add extension to message
    msg.addExtension(fileExt);

    //send message
    xmppConnection.sendPacket(msg);
}

To receive this message implement PacketListener and override processPacket():

@Override
public void processPacket(Packet packet) {

    Message message = (Message) packet;

    //Get extension from message
    ExtensionFile extFile = (ExtensionFile) message
                    .getExtension("file:namespace");

    if (extFile != null) {

        //Get values from extension
        String filePath = extFile.getFileURL();
        String fileSize = extFile.getFileSize();

        System.out.println("Message :" + message.getBody() + " File url:" + filePath + " File size:" + fileSize);
    }
}

and add this provide before connecting to xmpp server:

ProviderManager.getInstance().addExtensionProvider(
            ExtensionFile.ELEMENT, ExtensionFile.NAMESPACE,
            new ExtensionProviderFile());

TechQA.

Android aSmack - How to make custom message extension for file sending?

There are 2 answers

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