io.github.binaryfoo.cmdline.Main.kt Maven / Gradle / Ivy

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Some decoders for the data used in EMV credit card transactions.

There is a newer version: 0.1.8

package io.github.binaryfoo.cmdline

import io.github.binaryfoo.RootDecoder
import io.github.binaryfoo.TagInfo
import io.github.binaryfoo.decoders.DecodeSession
import java.io.BufferedReader
import java.io.InputStreamReader

/**
 * Command line too for parsing a few flavours of chip card data.
 */
class Main {
    companion object {
        @JvmStatic fun main(args: Array) {
            if (args.size < 2) {
                printHelp()
                System.exit(1)
            }
            val tag = args[0]
            val value = args[1]
            val meta = if (args.size > 2) args[2] else "EMV"

            val rootDecoder = RootDecoder()
            val decodeSession = DecodeSession()
            decodeSession.tagMetaData = rootDecoder.getTagMetaData(meta)
            val tagInfo = RootDecoder.getTagInfo(tag)
            if (tagInfo == null) {
                println("Unknown tag $tag")
                printHelp();
            } else {
                if (value == "-") {
                    val reader = BufferedReader(InputStreamReader(System.`in`))
                    while (true) {
                        val line = reader.readLine() ?: break
                        decodeValue(line, decodeSession, tagInfo)
                    }
                } else {
                    decodeValue(value, decodeSession, tagInfo)
                }
            }
        }

        private fun decodeValue(value: String, decodeSession: DecodeSession, tagInfo: TagInfo) {
            val decoded = tagInfo.decoder.decode(value, 0, decodeSession)
            DecodedWriter(System.out).write(decoded, "")
        }

        private fun printHelp() {
            System.out.println("Usage Main   []")
            System.out.println("   is one of")
            for (tag in RootDecoder.getSupportedTags()) {
                System.out.println("    " + tag.key + ": " + tag.value.shortName)
            }
            System.out.println("   is the hex string or '-' for standard input")
            System.out.println("   is one of " + RootDecoder.getAllTagMeta() + " defaults to EMV")
        }
    }
}

fun main(args: Array) = Main.main(args)