package io.fathom.cloud.secrets.services.ca;
import java.io.IOException;
import java.io.StringReader;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.charset.CharsetDecoder;
import java.nio.charset.CodingErrorAction;
import org.bouncycastle.pkcs.PKCS10CertificationRequest;
import org.bouncycastle.util.io.pem.PemObject;
import org.bouncycastle.util.io.pem.PemReader;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.google.common.base.Charsets;
public class CsrParser {
private static final Logger log = LoggerFactory.getLogger(CsrParser.class);
public CsrParser() {
}
// static final String BEGIN_PEM = "-----BEGIN CERTIFICATE REQUEST-----";
// static final String END_PEM = "-----END CERTIFICATE REQUEST-----";
public Object parse(byte[] data) {
Object key = null;
if (key == null) {
String s = tryDecodeAsString(data);
if (s != null) {
key = parse(s);
}
}
return null;
}
public PKCS10CertificationRequest parse(String s) {
PKCS10CertificationRequest key = null;
if (key == null) {
try {
key = parsePemFormat(s);
} catch (Exception e) {
log.debug("Cannot debug as PEM", e);
}
// if (s.contains(BEGIN_PEM)) {
// String payload = s.substring(s.indexOf(BEGIN_PEM) +
// BEGIN_PEM.length());
//
// if (payload.contains(END_PEM)) {
// payload = payload.substring(0, payload.indexOf(END_PEM) +
// END_PEM.length());
//
// try {
// key = parsePemFormat(payload);
// } catch (Exception e) {
// log.debug("Cannot debug as PEM", e);
// }
// }
// }
}
// if (key == null) {
// try {
// // TODO: Check if looks like base64??
// byte[] fromBase64 = CryptoUtils.fromBase64(s);
//
// key = parse(fromBase64);
// } catch (Exception e) {
// log.debug("Cannot decode as base64", e);
// }
// }
return key;
}
private String tryDecodeAsString(byte[] data) {
try {
// We do this so we get strict input processing
CharsetDecoder decoder = Charsets.UTF_8.newDecoder();
decoder.onMalformedInput(CodingErrorAction.REPORT);
decoder.onUnmappableCharacter(CodingErrorAction.REPORT);
ByteBuffer byteBuffer = ByteBuffer.wrap(data);
CharBuffer charBuffer = decoder.decode(byteBuffer);
return charBuffer.toString();
} catch (Exception e) {
log.debug("Cannot decode as string", e);
return null;
}
}
private PKCS10CertificationRequest parsePemFormat(String data) throws IOException {
PemReader reader = new PemReader(new StringReader(data));
PemObject pemObject = reader.readPemObject();
reader.close();
PKCS10CertificationRequest csr = new PKCS10CertificationRequest(pemObject.getContent());
return csr;
}
}