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package org.openslx.bwlp.sat.mail;
import java.nio.charset.CharsetEncoder;
import java.nio.charset.StandardCharsets;
import org.apache.commons.codec.binary.Base64;
import org.apache.commons.net.smtp.SimpleSMTPHeader;
public class QuotingSmtpHeader extends SimpleSMTPHeader {
private static CharsetEncoder asciiEncoder = StandardCharsets.US_ASCII.newEncoder();
public QuotingSmtpHeader(String fromAddress, String fromDisplayName, String to, String subject) {
super(buildNamedAddress(fromAddress, fromDisplayName), to, wrapEncoding(subject));
}
public QuotingSmtpHeader(String from, String to, String subject) {
super(from, to, wrapEncoding(subject));
}
@Override
public void addHeaderField(String headerField, String value) {
super.addHeaderField(headerField, wrapEncoding(value));
}
@Override
public void addCC(String address) {
super.addCC(wrapEncoding(address));
}
private static String wrapEncoding(String input) {
return wrapEncoding(input, false);
}
private static String wrapEncoding(String input, boolean addQuotesIfSpaces) {
boolean isAscii;
synchronized (asciiEncoder) { // Has class-wide state vars
isAscii = asciiEncoder.canEncode(input);
}
if (isAscii) {
if (addQuotesIfSpaces && (input.contains(" ") || input.contains("\t")))
return "\"" + input + "\"";
return input;
}
return "=?utf-8?B?"
+ new String(Base64.encodeBase64(input.getBytes(StandardCharsets.UTF_8), false),
StandardCharsets.UTF_8) + "?=";
}
private static String buildNamedAddress(String address, String name) {
if (name == null)
return address;
return wrapEncoding(name, true) + " <" + address + ">";
}
}
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