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/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright (c) 1997-2018 Oracle and/or its affiliates. All rights reserved.
*
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* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can
* obtain a copy of the License at
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* or LICENSE.txt. See the License for the specific
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*
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* file and include the License file at LICENSE.txt.
*
* GPL Classpath Exception:
* Oracle designates this particular file as subject to the "Classpath"
* exception as provided by Oracle in the GPL Version 2 section of the License
* file that accompanied this code.
*
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package com.sun.mail.iap;
import java.io.*;
import java.util.*;
import java.nio.charset.StandardCharsets;
import com.sun.mail.util.ASCIIUtility;
/**
* This class represents a response obtained from the input stream
* of an IMAP server.
*
* @author John Mani
* @author Bill Shannon
*/
public class Response {
protected int index; // internal index (updated during the parse)
protected int pindex; // index after parse, for reset
protected int size; // number of valid bytes in our buffer
protected byte[] buffer = null;
protected int type = 0;
protected String tag = null;
/** @since JavaMail 1.5.4 */
protected Exception ex;
protected boolean utf8;
private static final int increment = 100;
// The first and second bits indicate whether this response
// is a Continuation, Tagged or Untagged
public final static int TAG_MASK = 0x03;
public final static int CONTINUATION = 0x01;
public final static int TAGGED = 0x02;
public final static int UNTAGGED = 0x03;
// The third, fourth and fifth bits indicate whether this response
// is an OK, NO, BAD or BYE response
public final static int TYPE_MASK = 0x1C;
public final static int OK = 0x04;
public final static int NO = 0x08;
public final static int BAD = 0x0C;
public final static int BYE = 0x10;
// The sixth bit indicates whether a BYE response is synthetic or real
public final static int SYNTHETIC = 0x20;
/**
* An ATOM is any CHAR delimited by:
* SPACE | CTL | '(' | ')' | '{' | '%' | '*' | '"' | '\' | ']'
* (CTL is handled in readDelimString.)
*/
private static String ATOM_CHAR_DELIM = " (){%*\"\\]";
/**
* An ASTRING_CHAR is any CHAR delimited by:
* SPACE | CTL | '(' | ')' | '{' | '%' | '*' | '"' | '\'
* (CTL is handled in readDelimString.)
*/
private static String ASTRING_CHAR_DELIM = " (){%*\"\\";
public Response(String s) {
this(s, true);
}
/**
* Constructor for testing.
*
* @param s the response string
* @param supportsUtf8 allow UTF-8 in response?
* @since JavaMail 1.6.0
*/
public Response(String s, boolean supportsUtf8) {
if (supportsUtf8)
buffer = s.getBytes(StandardCharsets.UTF_8);
else
buffer = s.getBytes(StandardCharsets.US_ASCII);
size = buffer.length;
utf8 = supportsUtf8;
parse();
}
/**
* Read a new Response from the given Protocol
*
* @param p the Protocol object
* @exception IOException for I/O errors
* @exception ProtocolException for protocol failures
*/
public Response(Protocol p) throws IOException, ProtocolException {
// read one response into 'buffer'
ByteArray ba = p.getResponseBuffer();
ByteArray response = p.getInputStream().readResponse(ba);
buffer = response.getBytes();
size = response.getCount() - 2; // Skip the terminating CRLF
utf8 = p.supportsUtf8();
parse();
}
/**
* Copy constructor.
*
* @param r the Response to copy
*/
public Response(Response r) {
index = r.index;
pindex = r.pindex;
size = r.size;
buffer = r.buffer;
type = r.type;
tag = r.tag;
ex = r.ex;
utf8 = r.utf8;
}
/**
* Return a Response object that looks like a BYE protocol response.
* Include the details of the exception in the response string.
*
* @param ex the exception
* @return the synthetic Response object
*/
public static Response byeResponse(Exception ex) {
String err = "* BYE JavaMail Exception: " + ex.toString();
err = err.replace('\r', ' ').replace('\n', ' ');
Response r = new Response(err);
r.type |= SYNTHETIC;
r.ex = ex;
return r;
}
/**
* Does the server support UTF-8?
*
* @return true if the server supports UTF-8
* @since JavaMail 1.6.0
*/
public boolean supportsUtf8() {
return utf8;
}
private void parse() {
index = 0; // position internal index at start
if (size == 0) // empty line
return;
if (buffer[index] == '+') { // Continuation statement
type |= CONTINUATION;
index += 1; // Position beyond the '+'
return; // return
} else if (buffer[index] == '*') { // Untagged statement
type |= UNTAGGED;
index += 1; // Position beyond the '*'
} else { // Tagged statement
type |= TAGGED;
tag = readAtom(); // read the TAG, index positioned beyond tag
if (tag == null)
tag = ""; // avoid possible NPE
}
int mark = index; // mark
String s = readAtom(); // updates index
if (s == null)
s = ""; // avoid possible NPE
if (s.equalsIgnoreCase("OK"))
type |= OK;
else if (s.equalsIgnoreCase("NO"))
type |= NO;
else if (s.equalsIgnoreCase("BAD"))
type |= BAD;
else if (s.equalsIgnoreCase("BYE"))
type |= BYE;
else
index = mark; // reset
pindex = index;
return;
}
public void skipSpaces() {
while (index < size && buffer[index] == ' ')
index++;
}
/**
* Skip past any spaces. If the next non-space character is c,
* consume it and return true. Otherwise stop at that point
* and return false.
*
* @param c the character to look for
* @return true if the character is found
*/
public boolean isNextNonSpace(char c) {
skipSpaces();
if (index < size && buffer[index] == (byte)c) {
index++;
return true;
}
return false;
}
/**
* Skip to the next space, for use in error recovery while parsing.
*/
public void skipToken() {
while (index < size && buffer[index] != ' ')
index++;
}
public void skip(int count) {
index += count;
}
public byte peekByte() {
if (index < size)
return buffer[index];
else
return 0; // XXX - how else to signal error?
}
/**
* Return the next byte from this Statement.
*
* @return the next byte
*/
public byte readByte() {
if (index < size)
return buffer[index++];
else
return 0; // XXX - how else to signal error?
}
/**
* Extract an ATOM, starting at the current position. Updates
* the internal index to beyond the Atom.
*
* @return an Atom
*/
public String readAtom() {
return readDelimString(ATOM_CHAR_DELIM);
}
/**
* Extract a string stopping at control characters or any
* character in delim.
*/
private String readDelimString(String delim) {
skipSpaces();
if (index >= size) // already at end of response
return null;
int b;
int start = index;
while (index < size && ((b = (((int)buffer[index])&0xff)) >= ' ') &&
delim.indexOf((char)b) < 0 && b != 0x7f)
index++;
return toString(buffer, start, index);
}
/**
* Read a string as an arbitrary sequence of characters,
* stopping at the delimiter Used to read part of a
* response code inside [].
*
* @param delim the delimiter character
* @return the string
*/
public String readString(char delim) {
skipSpaces();
if (index >= size) // already at end of response
return null;
int start = index;
while (index < size && buffer[index] != delim)
index++;
return toString(buffer, start, index);
}
public String[] readStringList() {
return readStringList(false);
}
public String[] readAtomStringList() {
return readStringList(true);
}
private String[] readStringList(boolean atom) {
skipSpaces();
if (buffer[index] != '(') { // not what we expected
return null;
}
index++; // skip '('
// to handle buggy IMAP servers, we tolerate multiple spaces as
// well as spaces after the left paren or before the right paren
List result = new ArrayList<>();
while (!isNextNonSpace(')'))
result.add(atom ? readAtomString() : readString());
return result.toArray(new String[result.size()]);
}
/**
* Extract an integer, starting at the current position. Updates the
* internal index to beyond the number. Returns -1 if a number was
* not found.
*
* @return a number
*/
public int readNumber() {
// Skip leading spaces
skipSpaces();
int start = index;
while (index < size && Character.isDigit((char)buffer[index]))
index++;
if (index > start) {
try {
return ASCIIUtility.parseInt(buffer, start, index);
} catch (NumberFormatException nex) { }
}
return -1;
}
/**
* Extract a long number, starting at the current position. Updates the
* internal index to beyond the number. Returns -1 if a long number
* was not found.
*
* @return a long
*/
public long readLong() {
// Skip leading spaces
skipSpaces();
int start = index;
while (index < size && Character.isDigit((char)buffer[index]))
index++;
if (index > start) {
try {
return ASCIIUtility.parseLong(buffer, start, index);
} catch (NumberFormatException nex) { }
}
return -1;
}
/**
* Extract a NSTRING, starting at the current position. Return it as
* a String. The sequence 'NIL' is returned as null
*
* NSTRING := QuotedString | Literal | "NIL"
*
* @return a String
*/
public String readString() {
return (String)parseString(false, true);
}
/**
* Extract a NSTRING, starting at the current position. Return it as
* a ByteArrayInputStream. The sequence 'NIL' is returned as null
*
* NSTRING := QuotedString | Literal | "NIL"
*
* @return a ByteArrayInputStream
*/
public ByteArrayInputStream readBytes() {
ByteArray ba = readByteArray();
if (ba != null)
return ba.toByteArrayInputStream();
else
return null;
}
/**
* Extract a NSTRING, starting at the current position. Return it as
* a ByteArray. The sequence 'NIL' is returned as null
*
* NSTRING := QuotedString | Literal | "NIL"
*
* @return a ByteArray
*/
public ByteArray readByteArray() {
/*
* Special case, return the data after the continuation uninterpreted.
* It's usually a challenge for an AUTHENTICATE command.
*/
if (isContinuation()) {
skipSpaces();
return new ByteArray(buffer, index, size - index);
}
return (ByteArray)parseString(false, false);
}
/**
* Extract an ASTRING, starting at the current position
* and return as a String. An ASTRING can be a QuotedString, a
* Literal or an Atom (plus ']').
*
* Any errors in parsing returns null
*
* ASTRING := QuotedString | Literal | 1*ASTRING_CHAR
*
* @return a String
*/
public String readAtomString() {
return (String)parseString(true, true);
}
/**
* Generic parsing routine that can parse out a Quoted-String,
* Literal or Atom and return the parsed token as a String
* or a ByteArray. Errors or NIL data will return null.
*/
private Object parseString(boolean parseAtoms, boolean returnString) {
byte b;
// Skip leading spaces
skipSpaces();
b = buffer[index];
if (b == '"') { // QuotedString
index++; // skip the quote
int start = index;
int copyto = index;
while (index < size && (b = buffer[index]) != '"') {
if (b == '\\') // skip escaped byte
index++;
if (index != copyto) { // only copy if we need to
// Beware: this is a destructive copy. I'm
// pretty sure this is OK, but ... ;>
buffer[copyto] = buffer[index];
}
copyto++;
index++;
}
if (index >= size) {
// didn't find terminating quote, something is seriously wrong
//throw new ArrayIndexOutOfBoundsException(
// "index = " + index + ", size = " + size);
return null;
} else
index++; // skip past the terminating quote
if (returnString)
return toString(buffer, start, copyto);
else
return new ByteArray(buffer, start, copyto-start);
} else if (b == '{') { // Literal
int start = ++index; // note the start position
while (buffer[index] != '}')
index++;
int count = 0;
try {
count = ASCIIUtility.parseInt(buffer, start, index);
} catch (NumberFormatException nex) {
// throw new ParsingException();
return null;
}
start = index + 3; // skip "}\r\n"
index = start + count; // position index to beyond the literal
if (returnString) // return as String
return toString(buffer, start, start + count);
else
return new ByteArray(buffer, start, count);
} else if (parseAtoms) { // parse as ASTRING-CHARs
int start = index; // track this, so that we can use to
// creating ByteArrayInputStream below.
String s = readDelimString(ASTRING_CHAR_DELIM);
if (returnString)
return s;
else // *very* unlikely
return new ByteArray(buffer, start, index);
} else if (b == 'N' || b == 'n') { // the only valid value is 'NIL'
index += 3; // skip past NIL
return null;
}
return null; // Error
}
private String toString(byte[] buffer, int start, int end) {
return utf8 ?
new String(buffer, start, end - start, StandardCharsets.UTF_8) :
ASCIIUtility.toString(buffer, start, end);
}
public int getType() {
return type;
}
public boolean isContinuation() {
return ((type & TAG_MASK) == CONTINUATION);
}
public boolean isTagged() {
return ((type & TAG_MASK) == TAGGED);
}
public boolean isUnTagged() {
return ((type & TAG_MASK) == UNTAGGED);
}
public boolean isOK() {
return ((type & TYPE_MASK) == OK);
}
public boolean isNO() {
return ((type & TYPE_MASK) == NO);
}
public boolean isBAD() {
return ((type & TYPE_MASK) == BAD);
}
public boolean isBYE() {
return ((type & TYPE_MASK) == BYE);
}
public boolean isSynthetic() {
return ((type & SYNTHETIC) == SYNTHETIC);
}
/**
* Return the tag, if this is a tagged statement.
*
* @return tag of this tagged statement
*/
public String getTag() {
return tag;
}
/**
* Return the rest of the response as a string, usually used to
* return the arbitrary message text after a NO response.
*
* @return the rest of the response
*/
public String getRest() {
skipSpaces();
return toString(buffer, index, size);
}
/**
* Return the exception for a synthetic BYE response.
*
* @return the exception
* @since JavaMail 1.5.4
*/
public Exception getException() {
return ex;
}
/**
* Reset pointer to beginning of response.
*/
public void reset() {
index = pindex;
}
@Override
public String toString() {
return toString(buffer, 0, size);
}
}
