@Override
public void setEncoding(String encoding) throws MessagingException {
if (!MimeUtil.ENC_7BIT.equalsIgnoreCase(encoding)
&& !MimeUtil.ENC_8BIT.equalsIgnoreCase(encoding)) {
throw new MessagingException(
"Incompatible content-transfer-encoding applied to a CompositeBody");
}
mEncoding = encoding;
}
@Override
public void setUsing7bitTransport() throws MessagingException {
String type = getFirstHeader(MimeHeader.HEADER_CONTENT_TYPE);
/*
* We don't trust that a multipart/* will properly have an 8bit encoding
* header if any of its subparts are 8bit, so we automatically recurse
* (as long as its not multipart/signed).
*/
if (mBody instanceof CompositeBody && !MimeUtility.isSameMimeType(type, "multipart/signed")) {
setEncoding(MimeUtil.ENC_7BIT);
// recurse
((CompositeBody) mBody).setUsing7bitTransport();
} else if (!MimeUtil.ENC_8BIT.equalsIgnoreCase(
getFirstHeader(MimeHeader.HEADER_CONTENT_TRANSFER_ENCODING))) {
return;
} else if (type != null
&& (MimeUtility.isSameMimeType(type, "multipart/signed") || MimeUtility.isMessage(type))) {
/*
* This shouldn't happen. In any case, it would be wrong to convert
* them to some other encoding for 7bit transport.
*
* RFC 1847 says multipart/signed must be 7bit. It also says their
* bodies must be treated as opaque, so we must not change the
* encoding.
*
* We've dealt with (CompositeBody) type message/rfc822 above. Here
* we must deal with all other message/* types. RFC 2045 says
* message/* can only be 7bit or 8bit. RFC 2046 says unknown
* message/* types must be treated as application/octet-stream,
* which means we can't recurse into them. It also says that
* existing subtypes message/partial and message/external must only
* be 7bit, and that future subtypes "should be" 7bit.
*/
throw new MessagingException("Unable to convert 8bit body part to 7bit");
} else {
setEncoding(MimeUtil.ENC_QUOTED_PRINTABLE);
}
}