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1 package goodjava.mail;
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2
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3 import java.util.Map;
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4 import java.util.Base64;
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5 import java.util.Random;
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6 import java.util.regex.Pattern;
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7 import java.util.regex.Matcher;
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8 import goodjava.util.GoodUtils;
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9
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10
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11 public class Message {
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12 final Map<String,String> headers;
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13 final Object content;
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14 private static Pattern line = Pattern.compile("(?m)^.*$");
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15
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16 public Message(Map<String,String> headers,Object content) {
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17 this.headers = headers;
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18 this.content = content;
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19 }
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20
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21 private static void addBase64(StringBuilder sb,byte[] a) {
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22 String s = Base64.getEncoder().encodeToString(a);
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23 int n = s.length() - 76;
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24 int i;
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25 for( i=0; i<n; i+=76 ) {
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26 sb.append(s.substring(i,i+76)).append("\r\n");
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27 }
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28 sb.append(s.substring(i)).append("\r\n");
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29 }
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30
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31 public String toText() throws MailException {
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32 StringBuilder sb = new StringBuilder();
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33 String contentType = null;
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34 for( Map.Entry<String,String> entry : headers.entrySet() ) {
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35 String name = entry.getKey();
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36 String value = entry.getValue();
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37 if( name.equalsIgnoreCase("bcc") )
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38 continue;
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39 if( name.equalsIgnoreCase("content-type") ) {
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40 contentType = value;
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41 continue;
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42 }
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43 sb.append( name ).append( ": " ).append( value ).append( "\r\n" );
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44 }
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45 if( contentType==null )
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46 throw new MailException("Content-Type not defined");
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47 if( content instanceof String ) {
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48 String s = (String)content;
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49 sb.append( "Content-Type: " ).append( contentType ).append( "\r\n" );
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50 boolean isAscii = s.matches("\\p{ASCII}*");
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51 if( !isAscii )
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52 sb.append( "Content-Transfer-Encoding: base64\r\n" );
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53 sb.append( "\r\n" );
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54 if( isAscii ) {
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55 Matcher m = line.matcher(s);
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56 while( m.find() ) {
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57 sb.append(m.group()).append("\r\n");
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58 }
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59 } else {
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60 addBase64( sb, GoodUtils.getBytes(s,"UTF-8") );
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61 }
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62 } else if( content instanceof byte[] ) {
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63 sb.append( "Content-Type: " ).append( contentType ).append( "\r\n" );
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64 sb.append( "Content-Transfer-Encoding: base64\r\n" );
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65 sb.append( "\r\n" );
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66 addBase64( sb, (byte[])content );
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67 } else if( content instanceof Message[] ) {
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68 Message[] messages = (Message[])content;
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69 String[] texts = new String[messages.length];
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70 StringBuilder allTextSb = new StringBuilder();
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71 for( int i=0; i<messages.length; i++ ) {
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72 String text = messages[i].toText();
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73 texts[i] = text;
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74 allTextSb.append(text);
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75 }
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76 String allText = allTextSb.toString();
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77 String boundary;
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78 do {
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79 boundary = Long.toHexString(new Random().nextLong());
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80 } while( allText.contains(boundary) );
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81 sb.append( "Content-Type: " ).append( contentType )
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82 .append( "; boundary=\"" ).append( boundary ).append( "\"\r\n" );
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83 sb.append( "\r\n" );
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84 for( String text : texts ) {
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85 sb.append( "--" ).append( boundary ).append( "\r\n" );
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86 sb.append( text );
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87 sb.append( "\r\n" );
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88 }
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89 sb.append( "--" ).append( boundary ).append( "--\r\n" );
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90 } else
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91 throw new MailException("content is unrecognized type: "+content.getClass());
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92 return sb.toString();
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93 }
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94 }
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