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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.security.tool.crypto;
import com.yahoo.security.Base58;
import com.yahoo.security.Base62;
import com.yahoo.vespa.security.tool.CliUtils;
import com.yahoo.vespa.security.tool.Tool;
import com.yahoo.vespa.security.tool.ToolDescription;
import com.yahoo.vespa.security.tool.ToolInvocation;
import org.apache.commons.cli.Option;
import java.io.IOException;
import java.io.UncheckedIOException;
import java.util.Base64;
import java.util.List;
import static com.yahoo.security.ArrayUtils.fromUtf8Bytes;
import static com.yahoo.security.ArrayUtils.hex;
import static com.yahoo.security.ArrayUtils.unhex;
/**
* Simple tool to convert between different Base N encodings, for a fixed set of N.
*
* @author vekterli
*/
public class ConvertBaseTool implements Tool {
private static final int MAX_IN_BYTES = 1024;
static final String FROM_OPTION = "from";
static final String TO_OPTION = "to";
private static final List<Option> OPTIONS = List.of(
Option.builder("f")
.longOpt(FROM_OPTION)
.hasArg(true)
.required(false)
.desc("From base. Supported values: 16, 58, 62, 64")
.build(),
Option.builder("t")
.longOpt(TO_OPTION)
.hasArg(true)
.required(false)
.desc("To base. Supported values: 16, 58, 62, 64")
.build());
@Override
public String name() {
return "convert-base";
}
@Override
public ToolDescription description() {
return new ToolDescription(
"--from <base N> --to <base M>",
("Reads up to %d bytes of STDIN interpreted as a base N string (ignoring " +
"whitespace) and writes to STDOUT as a base M string. Note that base 64 is " +
"expected to be in (and is output as) the URL-safe alphabet (padding optional " +
"for input, no padding for output).").formatted(MAX_IN_BYTES),
"Note: this is a BETA tool version; its interface may be changed at any time.",
OPTIONS);
}
@Override
public int invoke(ToolInvocation invocation) {
try {
var arguments = invocation.arguments();
var fromBase = Integer.parseInt(CliUtils.optionOrThrow(arguments, FROM_OPTION));
var toBase = Integer.parseInt(CliUtils.optionOrThrow(arguments, TO_OPTION));
// We cap the input length since non-base(16|64) transforms are O(n^2) and we don't want
// to risk melting someone's CPU by them piping something large into the process by accident.
byte[] inBytes = invocation.stdIn().readAllBytes();
if (inBytes.length > MAX_IN_BYTES) {
throw new IllegalArgumentException("Input size is too large (%d), max is %d"
.formatted(inBytes.length, MAX_IN_BYTES));
}
var inString = fromUtf8Bytes(inBytes).strip(); // We ignore whitespace to avoid trailing \n issues
byte[] decoded = switch (fromBase) {
case 16 -> unhex(inString);
case 58 -> Base58.codec().decode(inString);
case 62 -> Base62.codec().decode(inString);
case 64 -> Base64.getUrlDecoder().decode(inString);
default -> throw new IllegalArgumentException("Unsupported from-base: %d".formatted(fromBase));
};
String encoded = switch (toBase) {
case 16 -> hex(decoded);
case 58 -> Base58.codec().encode(decoded);
case 62 -> Base62.codec().encode(decoded);
case 64 -> Base64.getUrlEncoder().withoutPadding().encodeToString(decoded);
default -> throw new IllegalArgumentException("Unsupported to-base: %d".formatted(toBase));
};
invocation.stdOut().println(encoded);
} catch (IOException e) {
throw new UncheckedIOException(e);
}
return 0;
}
}
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