Android Open Source - AndroIUT Email Utils

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License

The source code is released under:

GNU General Public License

Java Source Code

package com.iutdijon.androiut2.mail.services;
// w w w . j  a  v  a 2  s .  c om
import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.util.HashMap;
import java.util.logging.Logger;

import javax.mail.BodyPart;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Multipart;
import javax.mail.Part;
import javax.mail.internet.MimeMultipart;
import javax.mail.internet.MimeUtility;

import org.apache.commons.io.IOUtils;

import android.annotation.SuppressLint;
import android.util.Base64;
/**
 * Classe regroupant toutes les fonctions communes aux emails r?cup?rer via le protocol IMAP
 * @author Morgan Funtowicz
 *
 */
@SuppressLint("DefaultLocale")
public class EmailUtils {
  
  public static String extractMessage(Message msg) throws Exception {
    String msg_body = "";
    Object content = msg.getContent();
    if (content instanceof Multipart) {
      msg_body = handleMultipart((Multipart) content);
    } else {
      msg_body = handlePart(msg);
    }
    return msg_body;

  }

  
  public static String parseSenderAddress(String sender) throws UnsupportedEncodingException{
    return MimeUtility.decodeText(sender);
  }
  
  /**
   * Permet de r?cup?rer le contenu textuel d'un message avec le MIME : multipart/* de mani?re r?cursive
   * @param multipart La multipartie ? traiter
   * @return Le texte contenu dans la multipartie et sous partie de cette derni?re
   * @throws MessagingException Lev?e quand un probl?me survient dans la structure du message
   * @throws IOException Lev?e lorsqu'une erreur r?seau intervient
   */
  public static String handleMultipart(Multipart multipart)throws MessagingException, IOException {
    StringBuilder data = new StringBuilder();    
    if(multipart.getContentType().toLowerCase().contains("multipart/alternative")){
      
      boolean hasHtml = false;
      for (int i = 0; i < multipart.getCount(); i++) {
        if(multipart.getBodyPart(i).getContentType().toLowerCase().contains("html")){
          hasHtml = true;
          data.append(handlePart(multipart.getBodyPart(i)));
        }
      }
      if(!hasHtml){
        for (int i = 0; i < multipart.getCount(); i++) {
          if(multipart.getBodyPart(i).getContentType().toLowerCase().contains("multipart")){
            BodyPart bp = multipart.getBodyPart(i);
            
            if(bp.getContent()instanceof Multipart){
              Multipart related = (Multipart) bp.getContent();
              data.append(handleMultipart(related));
            }
          }
        }
      }
    }else{
      for (int i = 0, n = multipart.getCount(); i < n; i++) {
        data.append(handlePart(multipart.getBodyPart(i)));
      }
    }
    return data.toString();
  }

  /**
   * Permet de r?cup?rer le contenu textuel d'un message avec le MIME : part/* 
   * @param part La partie ? traiter
   * @return Le texte contenu dans part
   * @throws MessagingException Lev?e quand un probl?me survient dans la structure du message
   * @throws IOException Lev?e lorsqu'une erreur r?seau intervient
   */
  public static String handlePart(Part part) throws MessagingException, IOException {
    String disposition = part.getDisposition();
    String contentType = part.getContentType();
    String content = "";
    if (disposition == null) { // Body uniquement - V?rifier si de type plain
      if (contentType.toLowerCase().indexOf("text") != -1) {
        
        InputStream is = part.getInputStream();
        content = IOUtils.toString(is, getContentEncoding(part.getContentType()));
        
      } else { 
        if(contentType.toLowerCase().contains("multipart")){
          if(part.getContent() instanceof MimeMultipart){
            content = handleMultipart((Multipart) part.getContent());
          }else{
            Logger.getLogger("EmailUtils").severe("Multipart in body part with other type than MimeMultipart");
          }

        }
      }
    } else if (disposition.equalsIgnoreCase(Part.INLINE)) { 
      String fileExt = part.getFileName().substring(part.getFileName().lastIndexOf(".")+1);
      
      byte[] attach_stream = new byte[part.getSize()];
      InputStream is = part.getInputStream();
      BufferedInputStream bais = new BufferedInputStream(is);
      bais.read(attach_stream);
      
      String base64 = new String(Base64.encode(attach_stream, Base64.DEFAULT));
      
      if(fileExt.equalsIgnoreCase("jpeg") || fileExt.equalsIgnoreCase("jpg") || fileExt.equalsIgnoreCase("png") || fileExt.equalsIgnoreCase("webp")){
        content += "<img src='data:image/"+fileExt+";base64,"+base64+"' />";
      }
    }
    return content;
  }
  
  /**
   * Permet de r?cup?rer la liste des pi?ces jointes d'un email
   * @param m L'email dont on souhaite r?cup?rer la liste des pi?ces jointes
   * @return Un tableau de string avec le nom des pi?ces jointes
   * @throws MessagingException Lev?e quand un probl?me survient dans la structure du message
   * @throws IOException Lev?e lorsqu'une erreur r?seau intervient
   */
  public static HashMap<String, Part> getAttachments(Message m) throws IOException, MessagingException{
    
    HashMap<String, Part> attachments = new  HashMap<String, Part>(); 
    Object p = m.getContent();
    if(p instanceof Multipart){
      Multipart mp = (Multipart) p;
      for (int i = 0; i < mp.getCount(); i++) {
        Part bodyPart = mp.getBodyPart(i);
        String disposition = bodyPart.getDisposition();
        
        if(disposition != null){
          if(disposition.equalsIgnoreCase(Part.ATTACHMENT)){
            attachments.put(MimeUtility.decodeText(bodyPart.getFileName()), bodyPart);
          }
        }
      }
    }else if(p instanceof Part){
      Part part = (Part) p;
      if(part.getDisposition().equalsIgnoreCase(Part.ATTACHMENT)){
        attachments.put(MimeUtility.decodeText(part.getFileName()), part);
      }
    }
    return attachments.size() == 0 ? null : attachments;
  }
  
  /**
   * Permet de parser le contentType d'un email afin de d?terminer son encodage
   * @param contentType Le champ ContentType d'un email
   * @return Son encodage
   */
  public static String getContentEncoding(String contentType){

    if(contentType.equalsIgnoreCase("text/plain")){
      return "ISO-8859-1";
    }
    StringBuilder encoding = new StringBuilder();
    int charsetPos = contentType.indexOf("charset=") + 8;
    
    char c;
    while(charsetPos < contentType.length() && (c = contentType.charAt(charsetPos)) != ';'){
      encoding.append(c);
      ++charsetPos;
    }
    return encoding.toString();
  }
}

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