File Transfer using XMPPFramework

This application is merely a brief demo of how to use the file transfer extension of the XMPPFramework. This is a simple fork of xmpp-file-transfer-demo

Both incoming file transfers and outgoing file transfers are functional within this demo, but I've left a significant amount of error-handling out, so you'll want to include that in your app.

Server Settings

In order for SOCKS5 to work properly, your server must be configured to handle proxy connections. I've only tested this using ejabberd, but these are the mod_proxy65 settings I used:

{mod_proxy65,  [
     {ip, {0,0,0,0}},
     {hostname, "myhostnamehere"},
     {port, 7777},
     {access, all},
     {shaper, c2s_shaper}
]},

If you're unable to get the proxy functioning, you always have the option to set disableSOCKS5 = YES, which will force an IBB transfer instead. This is slower, but it's very widely supported.

Usage

Incoming File Transfers

Instantiate a new XMPPIncomingFileTransfer, activate it, add a delegate, and wait for a file transfer request.

var xmppIncomingFileTransfer = XMPPIncomingFileTransfer()
xmppIncomingFileTransfer.activate(xmppStream)
xmppIncomingFileTransfer.addDelegate(self, delegateQueue: DispatchQueue.main)

Responding to disco#info queries and the like are handled for you. You'll get a delegate call when an SI offer is received, at which point you can decide whether or not you wish to accept. You can also set autoAcceptFileTransfers = YES and you won't need to call acceptSIOffer: yourself.

func xmppIncomingFileTransfer(_ sender: XMPPIncomingFileTransfer, didFailWithError error: Error?) {
    DDLogVerbose("Incoming file transfer failed with error: " + error.debugDescription)
}

func xmppIncomingFileTransfer(_ sender: XMPPIncomingFileTransfer, didReceiveSIOffer offer: XMPPIQ) {
    DDLogVerbose("Incoming file transfer did receive SI offer. Accepting...")
    sender.acceptSIOffer(offer)
}

func xmppIncomingFileTransfer(_ sender: XMPPIncomingFileTransfer, didSucceedWith data: Data, named name: String) {
    DDLogVerbose("Incoming file transfer did succeed.")
    let paths: [Any] = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true
    let fullPath = URL(fileURLWithPath: paths.last as! String).appendingPathComponent(name)
    do {
        try
            data.write(to: fullPath, options: [])
        } catch let error as NSError  {
        DDLogVerbose("Could not sendFile \(error), \(error.userInfo)")
    }
    DDLogVerbose("Data was written to the path: " + fullPath.absoluteString)
}

Outgoing File Transfers

To start a new outgoing file transfer, simply create an instance of XMPPOutgoingFileTransfer, activate it, add a delegate, and send your data:

fileTransfer = XMPPOutgoingFileTransfer(dispatchQueue: DispatchQueue.main)
fileTransfer?.activate(appDelegate()?.xmppStream)
fileTransfer?.addDelegate(self, delegateQueue: DispatchQueue.main)

 do {
        let data = try Data(contentsOf: URL(fileURLWithPath: fullPath), options: .alwaysMapped)
        try fileTransfer?.send(data, named: filename, toRecipient: XMPPJID(string: recipient), description: "Baal's Soulstone, obviously.")
    }   
    catch let error as NSError  {
        DDLogVerbose("You messed something up: \(error), \(error.userInfo)")
    }

The following delegate calls when get invoked when appropriate:

func xmppOutgoingFileTransfer(_ sender: XMPPOutgoingFileTransfer, didFailWithError error: Error?) {
    DDLogInfo("Outgoing file transfer failed with error: " + error.debugDescription)
    let alert = UIAlertController(title: "Error", message: "There was an error sending your file. See the logs.", preferredStyle: .alert)
    let actionCancel = UIAlertAction(title: "OK", style: UIAlertActionStyle.cancel, handler: nil)
    alert.addAction(actionCancel)
    
    present(alert, animated: true, completion: nil)
}

func xmppOutgoingFileTransferDidSucceed(_ sender: XMPPOutgoingFileTransfer) {
    DDLogVerbose("File transfer successful.")
    let alert = UIAlertController(title: "Success!", message: "Your file was sent successfully.", preferredStyle: .alert)
    let actionCancel = UIAlertAction(title: "OK", style: UIAlertActionStyle.cancel, handler: nil)
    alert.addAction(actionCancel)
    
    present(alert, animated: true, completion: nil)
}

Originally developed by

Jonathon Staff

Migrated to Swift

Miguel Tejedor

License

Copyright 2017 Miguel Tejedor

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.