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/*
* Copyright (c) 1997, 2020 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0, which is available at
* http://www.eclipse.org/legal/epl-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception, which is available at
* https://www.gnu.org/software/classpath/license.html.
*
* SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
*/
package com.sun.mail.imap.protocol;
import java.util.List;
import java.util.ArrayList;
import jakarta.mail.internet.ParameterList;
import com.sun.mail.iap.*;
import com.sun.mail.util.PropUtil;
/**
* A BODYSTRUCTURE response.
*
* @author John Mani
* @author Bill Shannon
*/
public class BODYSTRUCTURE implements Item {
static final char[] name =
{'B','O','D','Y','S','T','R','U','C','T','U','R','E'};
public int msgno;
public String type; // Type
public String subtype; // Subtype
public String encoding; // Encoding
public int lines = -1; // Size in lines
public int size = -1; // Size in bytes
public String disposition; // Disposition
public String id; // Content-ID
public String description; // Content-Description
public String md5; // MD-5 checksum
public String attachment; // Attachment name
public ParameterList cParams; // Body parameters
public ParameterList dParams; // Disposition parameters
public String[] language; // Language
public BODYSTRUCTURE[] bodies; // array of BODYSTRUCTURE objects
// for multipart & message/rfc822
public ENVELOPE envelope; // for message/rfc822
private static int SINGLE = 1;
private static int MULTI = 2;
private static int NESTED = 3;
private int processedType; // MULTI | SINGLE | NESTED
// special debugging output to debug parsing errors
private static final boolean parseDebug =
PropUtil.getBooleanSystemProperty("mail.imap.parse.debug", false);
public BODYSTRUCTURE(FetchResponse r) throws ParsingException {
if (parseDebug)
System.out.println("DEBUG IMAP: parsing BODYSTRUCTURE");
msgno = r.getNumber();
if (parseDebug)
System.out.println("DEBUG IMAP: msgno " + msgno);
r.skipSpaces();
if (r.readByte() != '(')
throw new ParsingException(
"BODYSTRUCTURE parse error: missing ``('' at start");
if (r.peekByte() == '(') { // multipart
if (parseDebug)
System.out.println("DEBUG IMAP: parsing multipart");
type = "multipart";
processedType = MULTI;
List v = new ArrayList<>(1);
int i = 1;
do {
v.add(new BODYSTRUCTURE(r));
/*
* Even though the IMAP spec says there can't be any spaces
* between parts, some servers erroneously put a space in
* here. In the spirit of "be liberal in what you accept",
* we skip it.
*/
r.skipSpaces();
} while (r.peekByte() == '(');
// setup bodies.
bodies = v.toArray(new BODYSTRUCTURE[v.size()]);
subtype = r.readString(); // subtype
if (parseDebug)
System.out.println("DEBUG IMAP: subtype " + subtype);
if (r.isNextNonSpace(')')) { // done
if (parseDebug)
System.out.println("DEBUG IMAP: parse DONE");
return;
}
// Else, we have extension data
if (parseDebug)
System.out.println("DEBUG IMAP: parsing extension data");
// Body parameters
cParams = parseParameters(r);
if (r.isNextNonSpace(')')) { // done
if (parseDebug)
System.out.println("DEBUG IMAP: body parameters DONE");
return;
}
// Disposition
byte b = r.peekByte();
if (b == '(') {
if (parseDebug)
System.out.println("DEBUG IMAP: parse disposition");
r.readByte();
disposition = r.readString();
if (parseDebug)
System.out.println("DEBUG IMAP: disposition " +
disposition);
dParams = parseParameters(r);
if (!r.isNextNonSpace(')')) // eat the end ')'
throw new ParsingException(
"BODYSTRUCTURE parse error: " +
"missing ``)'' at end of disposition in multipart");
if (parseDebug)
System.out.println("DEBUG IMAP: disposition DONE");
} else if (b == 'N' || b == 'n') {
if (parseDebug)
System.out.println("DEBUG IMAP: disposition NIL");
r.skip(3); // skip 'NIL'
} else {
/*
throw new ParsingException(
"BODYSTRUCTURE parse error: " +
type + "/" + subtype + ": " +
"bad multipart disposition, b " + b);
*/
if (parseDebug)
System.out.println("DEBUG IMAP: bad multipart disposition" +
", applying Exchange bug workaround");
description = r.readString();
if (parseDebug)
System.out.println("DEBUG IMAP: multipart description " +
description);
// Throw away whatever comes after it, since we have no
// idea what it's supposed to be
while (r.readByte() == ' ')
parseBodyExtension(r);
return;
}
// RFC3501 allows no body-fld-lang after body-fld-disp,
// even though RFC2060 required it
if (r.isNextNonSpace(')')) {
if (parseDebug)
System.out.println("DEBUG IMAP: no body-fld-lang");
return; // done
}
// Language
if (r.peekByte() == '(') { // a list follows
language = r.readStringList();
if (parseDebug)
System.out.println(
"DEBUG IMAP: language len " + language.length);
} else {
String l = r.readString();
if (l != null) {
String[] la = { l };
language = la;
if (parseDebug)
System.out.println("DEBUG IMAP: language " + l);
}
}
// RFC3501 defines an optional "body location" next,
// but for now we ignore it along with other extensions.
// Throw away any further extension data
while (r.readByte() == ' ')
parseBodyExtension(r);
} else if (r.peekByte() == ')') { // (illegal) empty body
/*
* Domino will fail to return the body structure of nested messages.
* Fake it by providing an empty message. Could probably do better
* with more work...
*/
/*
* XXX - this prevents the exception, but without the exception
* the application has no way to know the data from the message
* is missing.
*
if (parseDebug)
System.out.println("DEBUG IMAP: empty body, fake it");
r.readByte();
type = "text";
subtype = "plain";
lines = 0;
size = 0;
*/
throw new ParsingException(
"BODYSTRUCTURE parse error: missing body content");
} else { // Single part
if (parseDebug)
System.out.println("DEBUG IMAP: single part");
type = r.readString();
if (parseDebug)
System.out.println("DEBUG IMAP: type " + type);
processedType = SINGLE;
subtype = r.readString();
if (parseDebug)
System.out.println("DEBUG IMAP: subtype " + subtype);
// SIMS 4.0 returns NIL for a Content-Type of "binary", fix it here
if (type == null) {
type = "application";
subtype = "octet-stream";
}
cParams = parseParameters(r);
if (parseDebug)
System.out.println("DEBUG IMAP: cParams " + cParams);
id = r.readString();
if (parseDebug)
System.out.println("DEBUG IMAP: id " + id);
description = r.readString();
if (parseDebug)
System.out.println("DEBUG IMAP: description " + description);
/*
* XXX - Work around bug in Exchange 2010 that
* returns unquoted string.
*/
encoding = r.readAtomString();
if (encoding != null && encoding.equalsIgnoreCase("NIL")) {
if (parseDebug)
System.out.println("DEBUG IMAP: NIL encoding" +
", applying Exchange bug workaround");
encoding = null;
}
/*
* XXX - Work around bug in office365.com that returns
* a string with a trailing space in some cases.
*/
if (encoding != null)
encoding = encoding.trim();
if (parseDebug)
System.out.println("DEBUG IMAP: encoding " + encoding);
size = r.readNumber();
if (parseDebug)
System.out.println("DEBUG IMAP: size " + size);
if (size < 0)
throw new ParsingException(
"BODYSTRUCTURE parse error: bad ``size'' element");
// "text/*" & "message/rfc822" types have additional data ..
if (type.equalsIgnoreCase("text")) {
lines = r.readNumber();
if (parseDebug)
System.out.println("DEBUG IMAP: lines " + lines);
if (lines < 0)
throw new ParsingException(
"BODYSTRUCTURE parse error: bad ``lines'' element");
} else if (type.equalsIgnoreCase("message") &&
subtype.equalsIgnoreCase("rfc822")) {
// Nested message
processedType = NESTED;
// The envelope comes next, but sadly Gmail handles nested
// messages just like simple body parts and fails to return
// the envelope and body structure of the message (sort of
// like IMAP4 before rev1).
r.skipSpaces();
if (r.peekByte() == '(') { // the envelope follows
envelope = new ENVELOPE(r);
if (parseDebug)
System.out.println(
"DEBUG IMAP: got envelope of nested message");
BODYSTRUCTURE[] bs = { new BODYSTRUCTURE(r) };
bodies = bs;
lines = r.readNumber();
if (parseDebug)
System.out.println("DEBUG IMAP: lines " + lines);
if (lines < 0)
throw new ParsingException(
"BODYSTRUCTURE parse error: bad ``lines'' element");
} else {
if (parseDebug)
System.out.println("DEBUG IMAP: " +
"missing envelope and body of nested message");
}
} else {
// Detect common error of including lines element on other types
r.skipSpaces();
byte bn = r.peekByte();
if (Character.isDigit((char)bn)) // number
throw new ParsingException(
"BODYSTRUCTURE parse error: server erroneously " +
"included ``lines'' element with type " +
type + "/" + subtype);
}
if (r.isNextNonSpace(')')) {
if (parseDebug)
System.out.println("DEBUG IMAP: parse DONE");
return; // done
}
// Optional extension data
// MD5
md5 = r.readString();
if (r.isNextNonSpace(')')) {
if (parseDebug)
System.out.println("DEBUG IMAP: no MD5 DONE");
return; // done
}
// Disposition
byte b = r.readByte();
if (b == '(') {
disposition = r.readString();
if (parseDebug)
System.out.println("DEBUG IMAP: disposition " +
disposition);
dParams = parseParameters(r);
if (parseDebug)
System.out.println("DEBUG IMAP: dParams " + dParams);
if (!r.isNextNonSpace(')')) // eat the end ')'
throw new ParsingException(
"BODYSTRUCTURE parse error: " +
"missing ``)'' at end of disposition");
} else if (b == 'N' || b == 'n') {
if (parseDebug)
System.out.println("DEBUG IMAP: disposition NIL");
r.skip(2); // skip 'NIL'
} else {
throw new ParsingException(
"BODYSTRUCTURE parse error: " +
type + "/" + subtype + ": " +
"bad single part disposition, b " + b);
}
if (r.isNextNonSpace(')')) {
if (parseDebug)
System.out.println("DEBUG IMAP: disposition DONE");
return; // done
}
// Language
if (r.peekByte() == '(') { // a list follows
language = r.readStringList();
if (parseDebug)
System.out.println("DEBUG IMAP: language len " +
language.length);
} else { // protocol is unnessarily complex here
String l = r.readString();
if (l != null) {
String[] la = { l };
language = la;
if (parseDebug)
System.out.println("DEBUG IMAP: language " + l);
}
}
// RFC3501 defines an optional "body location" next,
// but for now we ignore it along with other extensions.
// Throw away any further extension data
while (r.readByte() == ' ')
parseBodyExtension(r);
if (parseDebug)
System.out.println("DEBUG IMAP: all DONE");
}
}
public boolean isMulti() {
return processedType == MULTI;
}
public boolean isSingle() {
return processedType == SINGLE;
}
public boolean isNested() {
return processedType == NESTED;
}
private ParameterList parseParameters(Response r)
throws ParsingException {
r.skipSpaces();
ParameterList list = null;
byte b = r.readByte();
if (b == '(') {
list = new ParameterList();
do {
String name = r.readString();
if (parseDebug)
System.out.println("DEBUG IMAP: parameter name " + name);
if (name == null)
throw new ParsingException(
"BODYSTRUCTURE parse error: " +
type + "/" + subtype + ": " +
"null name in parameter list");
String value = r.readString();
if (parseDebug)
System.out.println("DEBUG IMAP: parameter value " + value);
if (value == null) { // work around buggy servers
if (parseDebug)
System.out.println("DEBUG IMAP: NIL parameter value" +
", applying Exchange bug workaround");
value = "";
}
list.set(name, value);
} while (!r.isNextNonSpace(')'));
list.combineSegments();
} else if (b == 'N' || b == 'n') {
if (parseDebug)
System.out.println("DEBUG IMAP: parameter list NIL");
r.skip(2);
} else
throw new ParsingException("Parameter list parse error");
return list;
}
private void parseBodyExtension(Response r) throws ParsingException {
r.skipSpaces();
byte b = r.peekByte();
if (b == '(') {
r.skip(1); // skip '('
do {
parseBodyExtension(r);
} while (!r.isNextNonSpace(')'));
} else if (Character.isDigit((char)b)) // number
r.readNumber();
else // nstring
r.readString();
}
}
