如何在Corda中下载加密的附件? [英] How to download the encrypted attachment in corda?

问题描述

如何在Corda中下载加密的附件?我已经在corda中上传了一个文件并对其进行了加密，并得到了哈希值.如何从其他节点下载相同的内容?

How to download the encrypted attachment in Corda? I have uploaded a file in corda and encrypted it and got the hash. How to download the same from other node?

推荐答案

考虑到，您已将Jar作为附件上传，其中包含一个文件(例如，法律协议pdf)，您可以按以下方式将其提取:

Consider, you have uploaded Jar as the attachment that contains a single file (e.g. legal agreement pdf), you can extract it as below:

//Get the attachmentJar from node for attachmentHash.
val attachmentJar: InputStream = cordaRPCOps.openAttachment(attachmentHash)

//Read the content of Jar to get file name and data.
var file_name_data: Pair<String, ByteArray>? = null
JarInputStream(attachment).use { jar ->
    while (true) {
        val nje = jar.nextEntry ?: break
        if (nje.isDirectory) {
            continue
        }
        file_name_data = Pair(nje.name, jar.readBytes())
    }
}

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