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Backport of the S/MIME features from resteasy-security

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package com.github.joschi.jersey.security.smime;

import com.github.joschi.jersey.security.BouncyIntegration;
import org.bouncycastle.cms.SignerInfoGenerator;
import org.bouncycastle.cms.jcajce.JcaSimpleSignerInfoGeneratorBuilder;
import org.bouncycastle.mail.smime.SMIMESignedGenerator;

import javax.mail.internet.MimeMultipart;
import javax.ws.rs.Produces;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.ext.MessageBodyWriter;
import javax.ws.rs.ext.Provider;
import javax.ws.rs.ext.Providers;
import java.io.IOException;
import java.io.OutputStream;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;

/**
 * @author Bill Burke
 * @version $Revision: 1 $
 */
@Provider
@Produces("*/*")
public class SignedWriter implements MessageBodyWriter {
    static {
        BouncyIntegration.init();
    }

    @Context
    private Providers providers;

    @Override
    public boolean isWriteable(Class type, Type genericType, Annotation[] annotations, MediaType mediaType) {
        return SignedOutput.class.isAssignableFrom(type);
    }

    @Override
    public long getSize(SignedOutput smimeOutput, Class type, Type genericType, Annotation[] annotations, MediaType mediaType) {
        return -1;
    }

    @Override
    public void writeTo(SignedOutput out, Class type, Type genericType, Annotation[] annotations, MediaType mediaType, MultivaluedMap headers, OutputStream os) throws IOException, WebApplicationException {
        try {
            SMIMESignedGenerator gen = new SMIMESignedGenerator();
            SignerInfoGenerator signer = new JcaSimpleSignerInfoGeneratorBuilder().setProvider("BC").build("SHA1WITHRSA", out.getPrivateKey(), out.getCertificate());
            gen.addSignerInfoGenerator(signer);

            MimeMultipart mp = gen.generate(EnvelopedWriter.createBodyPart(providers, out));
            String contentType = mp.getContentType();
            contentType = contentType.replace("\r\n", "").replace("\t", " ");
            headers.putSingle("Content-Type", contentType);
            mp.writeTo(os);
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }
}