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      1 /*
      2  * Copyright (C) 2008 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.android.emailcommon.internet;
     18 
     19 import com.android.emailcommon.mail.BodyPart;
     20 import com.android.emailcommon.mail.MessagingException;
     21 import com.android.emailcommon.mail.Multipart;
     22 
     23 import java.io.BufferedWriter;
     24 import java.io.IOException;
     25 import java.io.InputStream;
     26 import java.io.OutputStream;
     27 import java.io.OutputStreamWriter;
     28 
     29 public class MimeMultipart extends Multipart {
     30     protected String mPreamble;
     31 
     32     protected String mContentType;
     33 
     34     protected String mBoundary;
     35 
     36     protected String mSubType;
     37 
     38     public MimeMultipart() throws MessagingException {
     39         mBoundary = generateBoundary();
     40         setSubType("mixed");
     41     }
     42 
     43     public MimeMultipart(String contentType) throws MessagingException {
     44         this.mContentType = contentType;
     45         try {
     46             mSubType = MimeUtility.getHeaderParameter(contentType, null).split("/")[1];
     47             mBoundary = MimeUtility.getHeaderParameter(contentType, "boundary");
     48             if (mBoundary == null) {
     49                 throw new MessagingException("MultiPart does not contain boundary: " + contentType);
     50             }
     51         } catch (Exception e) {
     52             throw new MessagingException(
     53                     "Invalid MultiPart Content-Type; must contain subtype and boundary. ("
     54                             + contentType + ")", e);
     55         }
     56     }
     57 
     58     public String generateBoundary() {
     59         StringBuffer sb = new StringBuffer();
     60         sb.append("----");
     61         for (int i = 0; i < 30; i++) {
     62             sb.append(Integer.toString((int)(Math.random() * 35), 36));
     63         }
     64         return sb.toString().toUpperCase();
     65     }
     66 
     67     public String getPreamble() throws MessagingException {
     68         return mPreamble;
     69     }
     70 
     71     public void setPreamble(String preamble) throws MessagingException {
     72         this.mPreamble = preamble;
     73     }
     74 
     75     @Override
     76     public String getContentType() throws MessagingException {
     77         return mContentType;
     78     }
     79 
     80     public void setSubType(String subType) throws MessagingException {
     81         this.mSubType = subType;
     82         mContentType = String.format("multipart/%s; boundary=\"%s\"", subType, mBoundary);
     83     }
     84 
     85     @Override
     86     public void writeTo(OutputStream out) throws IOException, MessagingException {
     87         BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(out), 1024);
     88 
     89         if (mPreamble != null) {
     90             writer.write(mPreamble + "\r\n");
     91         }
     92 
     93         for (int i = 0, count = mParts.size(); i < count; i++) {
     94             BodyPart bodyPart = mParts.get(i);
     95             writer.write("--" + mBoundary + "\r\n");
     96             writer.flush();
     97             bodyPart.writeTo(out);
     98             writer.write("\r\n");
     99         }
    100 
    101         writer.write("--" + mBoundary + "--\r\n");
    102         writer.flush();
    103     }
    104 
    105     @Override
    106     public InputStream getInputStream() throws MessagingException {
    107         return null;
    108     }
    109 
    110     public String getSubTypeForTest() {
    111         return mSubType;
    112     }
    113 }
    114