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package org.jvnet.mimepull;
import java.io.IOException;
import java.util.NoSuchElementException;
import java.util.List;
/**
* InternetHeaders is a utility class that manages RFC822 style
* headers. Given an RFC822 format message stream, it reads lines
* until the blank line that indicates end of header. The input stream
* is positioned at the start of the body. The lines are stored
* within the object and can be extracted as either Strings or
* {@link Header} objects.
*
* This class is mostly intended for service providers. MimeMessage
* and MimeBody use this class for holding their headers.
*
*
A note on RFC822 and MIME headers
*
* RFC822 and MIME header fields must contain only
* US-ASCII characters. If a header contains non US-ASCII characters,
* it must be encoded as per the rules in RFC 2047. The MimeUtility
* class provided in this package can be used to to achieve this.
* Callers of the setHeader, addHeader, and
* addHeaderLine methods are responsible for enforcing
* the MIME requirements for the specified headers. In addition, these
* header fields must be folded (wrapped) before being sent if they
* exceed the line length limitation for the transport (1000 bytes for
* SMTP). Received headers may have been folded. The application is
* responsible for folding and unfolding headers as appropriate.
*
* @author John Mani
* @author Bill Shannon
*/
final class InternetHeaders {
private final FinalArrayList headers = new FinalArrayList();
/**
* Read and parse the given RFC822 message stream till the
* blank line separating the header from the body. Store the
* header lines inside this InternetHeaders object.
*
* Note that the header lines are added into this InternetHeaders
* object, so any existing headers in this object will not be
* affected.
*
* @param lis RFC822 input stream
*/
InternetHeaders(MIMEParser.LineInputStream lis) {
// Read header lines until a blank line. It is valid
// to have BodyParts with no header lines.
String line;
String prevline = null; // the previous header line, as a string
// a buffer to accumulate the header in, when we know it's needed
StringBuilder lineBuffer = new StringBuilder();
try {
//while ((line = lis.readLine()) != null) {
do {
line = lis.readLine();
if (line != null &&
(line.startsWith(" ") || line.startsWith("\t"))) {
// continuation of header
if (prevline != null) {
lineBuffer.append(prevline);
prevline = null;
}
lineBuffer.append("\r\n");
lineBuffer.append(line);
} else {
// new header
if (prevline != null) {
addHeaderLine(prevline);
} else if (lineBuffer.length() > 0) {
// store previous header first
addHeaderLine(lineBuffer.toString());
lineBuffer.setLength(0);
}
prevline = line;
}
} while (line != null && line.length() > 0);
} catch (IOException ioex) {
throw new MIMEParsingException("Error in input stream", ioex);
}
}
/**
* Return all the values for the specified header. The
* values are String objects. Returns null
* if no headers with the specified name exist.
*
* @param name header name
* @return array of header values, or null if none
*/
List getHeader(String name) {
// XXX - should we just step through in index order?
FinalArrayList v = new FinalArrayList(); // accumulate return values
int len = headers.size();
for( int i=0; i getAllHeaders() {
return headers; // conceptually it should be read-only, but for performance reason I'm not wrapping it here
}
/**
* Add an RFC822 header line to the header store.
* If the line starts with a space or tab (a continuation line),
* add it to the last header line in the list.
*
* Note that RFC822 headers can only contain US-ASCII characters
*
* @param line raw RFC822 header line
*/
void addHeaderLine(String line) {
try {
char c = line.charAt(0);
if (c == ' ' || c == '\t') {
Hdr h = (Hdr) headers.get(headers.size() - 1);
h.line += "\r\n" + line;
} else {
headers.add(new Hdr(line));
}
} catch (StringIndexOutOfBoundsException e) {
// line is empty, ignore it
} catch (NoSuchElementException e) {
// XXX - vector is empty?
}
}
}
/*
* A private utility class to represent an individual header.
*/
class Hdr implements Header {
String name; // the canonicalized (trimmed) name of this header
// XXX - should name be stored in lower case?
String line; // the entire RFC822 header "line"
/*
* Constructor that takes a line and splits out
* the header name.
*/
Hdr(String l) {
int i = l.indexOf(':');
if (i < 0) {
// should never happen
name = l.trim();
} else {
name = l.substring(0, i).trim();
}
line = l;
}
/*
* Constructor that takes a header name and value.
*/
Hdr(String n, String v) {
name = n;
line = n + ": " + v;
}
/*
* Return the "name" part of the header line.
*/
@Override
public String getName() {
return name;
}
/*
* Return the "value" part of the header line.
*/
@Override
public String getValue() {
int i = line.indexOf(':');
if (i < 0) {
return line;
}
int j;
if (name.equalsIgnoreCase("Content-Description")) {
// Content-Description should retain the folded whitespace after header unfolding -
// rf. RFC2822 section 2.2.3, rf. RFC2822 section 3.2.3
for (j = i + 1; j < line.length(); j++) {
char c = line.charAt(j);
if (!(/*c == ' ' ||*/c == '\t' || c == '\r' || c == '\n')) {
break;
}
}
} else {
// skip whitespace after ':'
for (j = i + 1; j < line.length(); j++) {
char c = line.charAt(j);
if (!(c == ' ' || c == '\t' || c == '\r' || c == '\n')) {
break;
}
}
}
return line.substring(j);
}
}