CODEWITHSUNDEEP
javacorda
Sameer Hameed
Sameer Hameed

Reputation: 65

Corda custom file upload endpoint

This is in continuation of my previous post. I have been able to call in-build endpoint for Corda attachment upload but I'm not sure how -

1) Where is this file uploaded (what if I want to store it at some specific location)?

and

2) How can I add this attachment to transaction so that it is available for other nodes?

I guess we need custom endpoint for these, so that I can upload the file to a given location and then pass the attachment(and it's hash code) in transactions.

Please assist.

Upvotes: 1

Views: 143

Answers (1)

Joel
Joel

Reputation: 23140

1) Attachments are stored in the node's database, in the NODE_ATTACHMENTS table. You cannot specify a custom location.

2) You add an attachment to a transaction by hash:

@InitiatingFlow
@StartableByRPC
class AddAttachmentFlow(private val attachmentHashString: String) : FlowLogic<SignedTransaction>() {

    @Suspendable
    override fun call(): SignedTransaction {
        val notary: Party = TODO("Pick a notary.")

        val attachmentHash = SecureHash.parse(attachmentHashString)

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

        TODO("Finish building transaction and gathering required signatures.")
    }
}

Upvotes: 1

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