session-android/src/org/thoughtcrime/securesms/mms/IncomingMediaMessage.java

package org.thoughtcrime.securesms.mms;

import android.text.TextUtils;

import org.thoughtcrime.securesms.crypto.MasterCipher;
import org.thoughtcrime.securesms.crypto.MasterSecret;
import org.thoughtcrime.securesms.util.Base64;
import org.thoughtcrime.securesms.util.GroupUtil;
import org.thoughtcrime.securesms.util.Util;
import org.whispersystems.libaxolotl.util.guava.Optional;
import org.whispersystems.textsecure.api.messages.TextSecureAttachment;
import org.whispersystems.textsecure.api.messages.TextSecureGroup;

import java.util.List;

import ws.com.google.android.mms.pdu.CharacterSets;
import ws.com.google.android.mms.pdu.EncodedStringValue;
import ws.com.google.android.mms.pdu.PduBody;
import ws.com.google.android.mms.pdu.PduHeaders;
import ws.com.google.android.mms.pdu.PduPart;
import ws.com.google.android.mms.pdu.RetrieveConf;

public class IncomingMediaMessage {

  private final PduHeaders headers;
  private final PduBody    body;
  private final String     groupId;
  private final boolean    push;

  public IncomingMediaMessage(RetrieveConf retreived) {
    this.headers = retreived.getPduHeaders();
    this.body    = retreived.getBody();
    this.groupId = null;
    this.push    = false;

    for (int i=0;i<body.getPartsNum();i++) {
      body.getPart(i).setContentId(String.valueOf(System.currentTimeMillis()).getBytes());
    }
  }

  public IncomingMediaMessage(MasterSecret masterSecret,
                              String from,
                              String to,
                              long sentTimeMillis,
                              Optional<String> relay,
                              Optional<String> body,
                              Optional<TextSecureGroup> group,
                              Optional<List<TextSecureAttachment>> attachments)
  {
    this.headers = new PduHeaders();
    this.body    = new PduBody();
    this.push    = true;

    if (group.isPresent()) {
      this.groupId = GroupUtil.getEncodedId(group.get().getGroupId());
    } else {
      this.groupId = null;
    }

    this.headers.setEncodedStringValue(new EncodedStringValue(from), PduHeaders.FROM);
    this.headers.appendEncodedStringValue(new EncodedStringValue(to), PduHeaders.TO);
    this.headers.setLongInteger(sentTimeMillis / 1000, PduHeaders.DATE);


    if (body.isPresent() && !TextUtils.isEmpty(body.get())) {
      PduPart text = new PduPart();
      text.setData(Util.toUtf8Bytes(body.get()));
      text.setContentType(Util.toIsoBytes("text/plain"));
      text.setCharset(CharacterSets.UTF_8);
      this.body.addPart(text);
    }

    if (attachments.isPresent()) {
      for (TextSecureAttachment attachment : attachments.get()) {
        if (attachment.isPointer()) {
          PduPart media        = new PduPart();
          byte[]  encryptedKey = new MasterCipher(masterSecret).encryptBytes(attachment.asPointer().getKey());

          media.setContentType(Util.toIsoBytes(attachment.getContentType()));
          media.setContentLocation(Util.toIsoBytes(String.valueOf(attachment.asPointer().getId())));
          media.setContentDisposition(Util.toIsoBytes(Base64.encodeBytes(encryptedKey)));

          if (relay.isPresent()) {
            media.setName(Util.toIsoBytes(relay.get()));
          }

          media.setPendingPush(true);

          this.body.addPart(media);
        }
      }
    }
  }

  public PduHeaders getPduHeaders() {
    return headers;
  }

  public PduBody getBody() {
    return body;
  }

  public String getGroupId() {
    return groupId;
  }

  public boolean isPushMessage() {
    return push;
  }

  public boolean isGroupMessage() {
    return groupId != null                                           ||
        !Util.isEmpty(headers.getEncodedStringValues(PduHeaders.CC)) ||
        (headers.getEncodedStringValues(PduHeaders.TO) != null &&
         headers.getEncodedStringValues(PduHeaders.TO).length > 1);
  }
}