Corda uploading a file attach and download

Question

I have tried to upload and send a file with the help of following linkhttps://github.com/corda/corda/tree/release-M14

When I tried to used it in Cordaapp example it is showing many error. Is there any simple example to upload the file and attach? Please suggest. Thanks

Answer 1

Hey, i found an example that i think would be helpful for you: 

 https://github.com/corda/blacklist.

You can upload an attachment to a node via HTTP:

<form action="/upload/attachment" method="post" enctype="multipart/form-data">
    <div class="form-group">
        <input type="file" name="jar" class="form-control">
    </div>
    <br>
    <button type="submit" class="btn btn-default">Upload JAR</button>
</form>

Or you can upload an attachment using an RPC client:

val nodeAddress = parse(arg)
val rpcConnection = CordaRPCClient(nodeAddress).start("user1", "test")
val proxy = rpcConnection.proxy

val attachmentHash = uploadAttachment(proxy, JAR_PATH)

Then you add the attachment to a TransactionBuilder as follows:

val txBuilder = TransactionBuilder(notary)
    .addAttachment(attachmentHash)

It is up to you where you get the attachment hash. You may pass it as an argument to the flow, for example.