org.apache.james.jmap.crypto.PublicKeyReader.java Source code

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Here is the source code for org.apache.james.jmap.crypto.PublicKeyReader.java

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 * to you under the Apache License, Version 2.0 (the            *
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package org.apache.james.jmap.crypto;

import java.io.IOException;
import java.io.StringReader;
import java.security.PublicKey;
import java.util.Optional;

import org.bouncycastle.asn1.x509.SubjectPublicKeyInfo;
import org.bouncycastle.openssl.PEMParser;
import org.bouncycastle.openssl.jcajce.JcaPEMKeyConverter;
import org.bouncycastle.util.io.pem.PemReader;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class PublicKeyReader {

    private static final Logger LOGGER = LoggerFactory.getLogger(PublicKeyReader.class);

    Optional<PublicKey> fromPEM(Optional<String> pemKey) {

        return pemKey.map(k -> new PEMParser(new PemReader(new StringReader(k)))).flatMap(this::publicKeyFrom);
    }

    private Optional<PublicKey> publicKeyFrom(PEMParser reader) {
        try {
            Object readPEM = reader.readObject();
            if (readPEM instanceof SubjectPublicKeyInfo) {
                return Optional.of(new JcaPEMKeyConverter().getPublicKey((SubjectPublicKeyInfo) readPEM));
            }
            return Optional.empty();
        } catch (IOException e) {
            LOGGER.warn("Error when reading the PEM file", e);
            return Optional.empty();
        }
    }
}