org.nightcode.milter.MessageModificationServiceImpl Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of jmilter Show documentation
Java implementation of the Sendmail Milter protocol.
There is a newer version: 0.8
/*
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */

package org.nightcode.milter;

import org.nightcode.milter.net.MilterPacket;
import org.nightcode.milter.util.ByteArrays;
import org.nightcode.milter.util.ProtocolSteps;

import java.nio.charset.StandardCharsets;
import java.util.Objects;

import javax.annotation.Nullable;

class MessageModificationServiceImpl implements MessageModificationService {

  MessageModificationServiceImpl() {
    // do nothing
  }

  @Override public void addHeader(MilterContext context, String name, String value) throws MilterException {
    header(context, SMFIR_ADDHEADER, -1, name, value);
  }

  @Override public void changeHeader(MilterContext context, int index, String name, @Nullable String value)
      throws MilterException {
    if (value == null) {
      value = "";
    }
    header(context, SMFIR_CHGHEADER, index, name, value);
  }

  @Override public void insertHeader(MilterContext context, int index, String name, String value)
      throws MilterException {
    header(context, SMFIR_INSHEADER, index, name, value);
  }

  @Override public void changeFrom(MilterContext context, String from, @Nullable String args) throws MilterException {
    send(SMFIR_CHGFROM, context, from, args);
  }

  @Override public void addRecipient(MilterContext context, String recipient) throws MilterException {
    send(SMFIR_ADDRCPT, context, recipient);
  }

  @Override public void addRecipientEsmtpPar(MilterContext context, String recipient, String args)
      throws MilterException {
    send(SMFIR_ADDRCPT_PAR, context, recipient, args);
  }

  @Override public void deleteRecipient(MilterContext context, String recipient) throws MilterException {
    send(SMFIR_DELRCPT, context, recipient);
  }

  @Override public void replaceBody(MilterContext context, byte[] body) throws MilterException {
    int length;
    if (body.length > MILTER_CHUNK_SIZE) {
      length = MILTER_CHUNK_SIZE;
    } else {
      length = body.length;
    }

    int offset = 0;
    while (offset < body.length) {
      MilterPacket packet = MilterPacket.builder()
          .command(SMFIR_REPLBODY)
          .payload(body, offset, length)
          .build();
      context.sendPacket(packet);
      offset += length;
      if (offset + length >= body.length) {
        length = body.length - offset;
      }
    }
  }

  @Override public void progress(MilterContext context) throws MilterException {
    MilterPacket packet = MilterPacket.builder()
        .command(SMFIR_PROGRESS)
        .build();

    context.sendPacket(packet);
  }

  @Override public void quarantine(MilterContext context, String reason) throws MilterException {
    send(SMFIR_QUARANTINE, context, reason);
  }

  private void header(MilterContext context, int command, int index, String name, String value) throws MilterException {
    Objects.requireNonNull(name, "header name");
    Objects.requireNonNull(value, "header value");

    int payloadLength = 0;

    byte[] headerName = name.getBytes(StandardCharsets.UTF_8);
    payloadLength += (headerName.length + 1);

    if (value.length() > 0 && (context.getSessionProtocolSteps().bitmap() & ProtocolSteps.HEADER_VALUE_LEADING_SPACE)
        == ProtocolSteps.HEADER_VALUE_LEADING_SPACE) {
      value = " " + value;
    }

    byte[] headerValue = value.getBytes(StandardCharsets.UTF_8);
    payloadLength += (headerValue.length + 1);

    if (index >= 0) {
      payloadLength += 4;
    }

    int offset = 0;
    byte[] payload = new byte[payloadLength];

    if (index >= 0) {
      byte[] idx = ByteArrays.intToByteArray(index);
      System.arraycopy(idx, 0, payload, offset, idx.length);
      offset += idx.length;
    }

    System.arraycopy(headerName, 0, payload, offset, headerName.length);
    offset += (headerName.length + 1);

    System.arraycopy(headerValue, 0, payload, offset, headerValue.length);

    MilterPacket packet = MilterPacket.builder()
        .command(command)
        .payload(payload)
        .build();

    context.sendPacket(packet);
  }

  private void send(int command, MilterContext context, String arg) throws MilterException {
    byte[] buf = arg.getBytes(StandardCharsets.UTF_8);
    byte[] payload = new byte[buf.length + 1];
    System.arraycopy(buf, 0, payload, 0, buf.length);

    MilterPacket packet = MilterPacket.builder()
        .command(command)
        .payload(payload)
        .build();
    context.sendPacket(packet);
  }

  private void send(int command, MilterContext context, String arg1, String arg2) throws MilterException {
    int payloadLength = 0;

    byte[] buf1 = arg1.getBytes(StandardCharsets.UTF_8);
    payloadLength += (buf1.length + 1);

    byte[] buf2 = null;
    if (arg2 != null) {
      buf2 = arg2.getBytes(StandardCharsets.UTF_8);
      payloadLength += (buf2.length + 1);
    }

    int offset = 0;
    byte[] payload = new byte[payloadLength];

    System.arraycopy(buf1, 0, payload, 0, buf1.length);

    if (buf2 != null) {
      offset += (buf1.length + 1);
      System.arraycopy(buf2, 0, payload, offset, buf2.length);
    }

    MilterPacket packet = MilterPacket.builder()
        .command(command)
        .payload(payload)
        .build();
    context.sendPacket(packet);
  }
}