Package com.google.code.javax.mail.internet

Source Code of com.google.code.javax.mail.internet.InternetHeaders$InternetHeader

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package com.google.code.javax.mail.internet;

import java.io.*;
import java.util.*;
import com.google.code.javax.mail.*;
import com.google.code.com.sun.mail.util.LineInputStream;
import com.google.code.com.sun.mail.util.PropUtil;

/**
* 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 javax.mail.Header} objects. <p>
*
* This class is mostly intended for service providers. MimeMessage
* and MimeBody use this class for holding their headers. <p>
*
* <hr> <strong>A note on RFC822 and MIME headers</strong><p>
*
* RFC822 and MIME header fields <strong>must</strong> 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 <code>setHeader</code>, <code>addHeader</code>, and
* <code>addHeaderLine</code> 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. <p>
*
* The current implementation supports the System property
* <code>mail.mime.ignorewhitespacelines</code>, which if set to true
* will cause a line containing only whitespace to be considered
* a blank line terminating the header.
*
* @see  javax.mail.internet.MimeUtility
* @author John Mani
* @author Bill Shannon
*/

public class InternetHeaders {
    private static final boolean ignoreWhitespaceLines =
  PropUtil.getBooleanSystemProperty("mail.mime.ignorewhitespacelines",
              false);

    /**
     * An individual internet header.  This class is only used by
     * subclasses of InternetHeaders. <p>
     *
     * An InternetHeader object with a null value is used as a placeholder
     * for headers of that name, to preserve the order of headers.
     * A placeholder InternetHeader object with a name of ":" marks
     * the location in the list of headers where new headers are
     * added by default.
     *
     * @since  JavaMail 1.4
     */
    protected static final class InternetHeader extends Header {
  /*
   * Note that the value field from the superclass
   * isn't used in this class.  We extract the value
   * from the line field as needed.  We store the line
   * rather than just the value to ensure that we can
   * get back the exact original line, with the original
   * whitespace, etc.
   */
  String line;    // the entire RFC822 header "line",
      // or null if placeholder

  /**
   * Constructor that takes a line and splits out
   * the header name.
   */
  public InternetHeader(String l) {
      super("", "")// XXX - we'll change it later
      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.
   */
  public InternetHeader(String n, String v) {
      super(n, "");
      if (v != null)
    line = n + ": " + v;
      else
    line = null;
  }

  /**
   * Return the "value" part of the header line.
   */
  public String getValue() {
      int i = line.indexOf(':');
      if (i < 0)
    return line;
      // skip whitespace after ':'
      int j;
      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);
  }
    }

    /*
     * The enumeration object used to enumerate an
     * InternetHeaders object.  Can return
     * either a String or a Header object.
     */
    static class matchEnum implements Enumeration {
  private Iterator e;  // enum object of headers List
  // XXX - is this overkill?  should we step through in index
  // order instead?
  private String names[]// names to match, or not
  private boolean match;  // return matching headers?
  private boolean want_line;  // return header lines?
  private InternetHeader next_header; // the next header to be returned

  /*
   * Constructor.  Initialize the enumeration for the entire
   * List of headers, the set of headers, whether to return
   * matching or non-matching headers, and whether to return
   * header lines or Header objects.
   */
  matchEnum(List v, String n[], boolean m, boolean l) {
      e = v.iterator();
      names = n;
      match = m;
      want_line = l;
      next_header = null;
  }

  /*
   * Any more elements in this enumeration?
   */
  public boolean hasMoreElements() {
      // if necessary, prefetch the next matching header,
      // and remember it.
      if (next_header == null)
    next_header = nextMatch();
      return next_header != null;
  }

  /*
   * Return the next element.
   */
  public Object nextElement() {
      if (next_header == null)
    next_header = nextMatch();

      if (next_header == null)
    throw new NoSuchElementException("No more headers");

      InternetHeader h = next_header;
      next_header = null;
      if (want_line)
    return h.line;
      else
    return new Header(h.getName(), h.getValue());
  }

  /*
   * Return the next Header object according to the match
   * criteria, or null if none left.
   */
  private InternetHeader nextMatch() {
      next:
      while (e.hasNext()) {
    InternetHeader h = (InternetHeader)e.next();

    // skip "place holder" headers
    if (h.line == null)
        continue;

    // if no names to match against, return appropriately
    if (names == null)
        return match ? null : h;

    // check whether this header matches any of the names
    for (int i = 0; i < names.length; i++) {
        if (names[i].equalsIgnoreCase(h.getName())) {
      if (match)
          return h;
      else
          // found a match, but we're
          // looking for non-matches.
          // try next header.
          continue next;
        }
    }
    // found no matches.  if that's what we wanted, return it.
    if (!match)
        return h;
      }
      return null;
  }
    }


    /**
     * The actual list of Headers, including placeholder entries.
     * Placeholder entries are Headers with a null value and
     * are never seen by clients of the InternetHeaders class.
     * Placeholder entries are used to keep track of the preferred
     * order of headers.  Headers are never actually removed from
     * the list, they're converted into placeholder entries.
     * New headers are added after existing headers of the same name
     * (or before in the case of <code>Received</code> and
     * <code>Return-Path</code> headers).  If no existing header
     * or placeholder for the header is found, new headers are
     * added after the special placeholder with the name ":".
     *
     * @since  JavaMail 1.4
     */
    protected List headers;

    /**
     * Create an empty InternetHeaders object.  Placeholder entries
     * are inserted to indicate the preferred order of headers.
     */
    public InternetHeaders() {
     headers = new ArrayList(40);
  headers.add(new InternetHeader("Return-Path", null));
  headers.add(new InternetHeader("Received", null));
  headers.add(new InternetHeader("Resent-Date", null));
  headers.add(new InternetHeader("Resent-From", null));
  headers.add(new InternetHeader("Resent-Sender", null));
  headers.add(new InternetHeader("Resent-To", null));
  headers.add(new InternetHeader("Resent-Cc", null));
  headers.add(new InternetHeader("Resent-Bcc", null));
  headers.add(new InternetHeader("Resent-Message-Id", null));
  headers.add(new InternetHeader("Date", null));
  headers.add(new InternetHeader("From", null));
  headers.add(new InternetHeader("Sender", null));
  headers.add(new InternetHeader("Reply-To", null));
  headers.add(new InternetHeader("To", null));
  headers.add(new InternetHeader("Cc", null));
  headers.add(new InternetHeader("Bcc", null));
  headers.add(new InternetHeader("Message-Id", null));
  headers.add(new InternetHeader("In-Reply-To", null));
  headers.add(new InternetHeader("References", null));
  headers.add(new InternetHeader("Subject", null));
  headers.add(new InternetHeader("Comments", null));
  headers.add(new InternetHeader("Keywords", null));
  headers.add(new InternetHeader("Errors-To", null));
  headers.add(new InternetHeader("MIME-Version", null));
  headers.add(new InternetHeader("Content-Type", null));
  headers.add(new InternetHeader("Content-Transfer-Encoding", null));
  headers.add(new InternetHeader("Content-MD5", null));
  headers.add(new InternetHeader(":", null));
  headers.add(new InternetHeader("Content-Length", null));
  headers.add(new InternetHeader("Status", null));
    }

    /**
     * Read and parse the given RFC822 message stream till the
     * blank line separating the header from the body. The input
     * stream is left positioned at the start of the body. The
     * header lines are stored internally. <p>
     *
     * For efficiency, wrap a BufferedInputStream around the actual
     * input stream and pass it as the parameter. <p>
     *
     * No placeholder entries are inserted; the original order of
     * the headers is preserved.
     *
     * @param  is   RFC822 input stream
     */
    public InternetHeaders(InputStream is) throws MessagingException {
     headers = new ArrayList(40);
  load(is);
    }

    /**
     * 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. The order
     * of header lines is preserved. <p>
     *
     * Note that the header lines are added into this InternetHeaders
     * object, so any existing headers in this object will not be
     * affected.  Headers are added to the end of the existing list
     * of headers, in order.
     *
     * @param  is   RFC822 input stream
     */
    public void load(InputStream is) throws MessagingException {
  // Read header lines until a blank line. It is valid
  // to have BodyParts with no header lines.
  String line;
  LineInputStream lis = new LineInputStream(is);
  String prevline = null// the previous header line, as a string
  // a buffer to accumulate the header in, when we know it's needed
  StringBuffer lineBuffer = new StringBuffer();

  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 && !isEmpty(line));
  } catch (IOException ioex) {
      throw new MessagingException("Error in input stream", ioex);
  }
    }

    /**
     * Is this line an empty (blank) line?
     */
    private static final boolean isEmpty(String line) {
  return line.length() == 0 ||
      (ignoreWhitespaceLines && line.trim().length() == 0);
    }

    /**
     * Return all the values for the specified header. The
     * values are String objects.  Returns <code>null</code>
     * if no headers with the specified name exist.
     *
     * @param  name   header name
     * @return    array of header values, or null if none
     */
    public String[] getHeader(String name) {
  Iterator e = headers.iterator();
  // XXX - should we just step through in index order?
  List v = new ArrayList(); // accumulate return values

  while (e.hasNext()) {
      InternetHeader h = (InternetHeader)e.next();
      if (name.equalsIgnoreCase(h.getName()) && h.line != null) {
    v.add(h.getValue());
      }
  }
  if (v.size() == 0)
      return (null);
  // convert List to an array for return
  String r[] = new String[v.size()];
  r = (String[])v.toArray(r);
  return (r);
    }

    /**
     * Get all the headers for this header name, returned as a single
     * String, with headers separated by the delimiter. If the
     * delimiter is <code>null</code>, only the first header is
     * returned.  Returns <code>null</code>
     * if no headers with the specified name exist.
     *
     * @param  name     header name
     * @param   delimiter  delimiter
     * @return                  the value fields for all headers with
     *        this name, or null if none
     */
    public String getHeader(String name, String delimiter) {
  String s[] = getHeader(name);

  if (s == null)
      return null;
 
  if ((s.length == 1) || delimiter == null)
      return s[0];
 
  StringBuffer r = new StringBuffer(s[0]);
  for (int i = 1; i < s.length; i++) {
      r.append(delimiter);
      r.append(s[i]);
  }
  return r.toString();
    }

    /**
     * Change the first header line that matches name
     * to have value, adding a new header if no existing header
     * matches. Remove all matching headers but the first. <p>
     *
     * Note that RFC822 headers can only contain US-ASCII characters
     *
     * @param  name  header name
     * @param  value  header value
     */
    public void setHeader(String name, String value) {
  boolean found = false;

  for (int i = 0; i < headers.size(); i++) {
      InternetHeader h = (InternetHeader)headers.get(i);
      if (name.equalsIgnoreCase(h.getName())) {
    if (!found) {
        int j;
        if (h.line != null && (j = h.line.indexOf(':')) >= 0) {
      h.line = h.line.substring(0, j + 1) + " " + value;
      // preserves capitalization, spacing
        } else {
      h.line = name + ": " + value;
        }
        found = true;
    } else {
        headers.remove(i);
        i--;    // have to look at i again
    }
      }
  }
   
  if (!found) {
      addHeader(name, value);
  }
    }

    /**
     * Add a header with the specified name and value to the header list. <p>
     *
     * The current implementation knows about the preferred order of most
     * well-known headers and will insert headers in that order.  In
     * addition, it knows that <code>Received</code> headers should be
     * inserted in reverse order (newest before oldest), and that they
     * should appear at the beginning of the headers, preceeded only by
     * a possible <code>Return-Path</code> header.  <p>
     *
     * Note that RFC822 headers can only contain US-ASCII characters.
     *
     * @param  name  header name
     * @param  value  header value
     */
    public void addHeader(String name, String value) {
  int pos = headers.size();
  boolean addReverse =
      name.equalsIgnoreCase("Received") ||
      name.equalsIgnoreCase("Return-Path");
  if (addReverse)
      pos = 0;
  for (int i = headers.size() - 1; i >= 0; i--) {
      InternetHeader h = (InternetHeader)headers.get(i);
      if (name.equalsIgnoreCase(h.getName())) {
    if (addReverse) {
        pos = i;
    } else {
        headers.add(i + 1, new InternetHeader(name, value));
        return;
    }
      }
      // marker for default place to add new headers
      if (!addReverse && h.getName().equals(":"))
    pos = i;
  }
  headers.add(pos, new InternetHeader(name, value));
    }

    /**
     * Remove all header entries that match the given name
     * @param  name   header name
     */
    public void removeHeader(String name) {
  for (int i = 0; i < headers.size(); i++) {
      InternetHeader h = (InternetHeader)headers.get(i);
      if (name.equalsIgnoreCase(h.getName())) {
    h.line = null;
    //headers.remove(i);
    //i--;    // have to look at i again
      }
  }
    }

    /**
     * Return all the headers as an Enumeration of
     * {@link javax.mail.Header} objects.
     *
     * @return  Header objects 
     */
    public Enumeration getAllHeaders() {
  return (new matchEnum(headers, null, false, false));
    }

    /**
     * Return all matching {@link javax.mail.Header} objects.
     *
     * @return  matching Header objects 
     */
    public Enumeration getMatchingHeaders(String[] names) {
  return (new matchEnum(headers, names, true, false));
    }

    /**
     * Return all non-matching {@link javax.mail.Header} objects.
     *
     * @return  non-matching Header objects 
     */
    public Enumeration getNonMatchingHeaders(String[] names) {
  return (new matchEnum(headers, names, false, false));
    }

    /**
     * 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.  Otherwise,
     * append the new header line to the list.  <p>
     *
     * Note that RFC822 headers can only contain US-ASCII characters
     *
     * @param  line  raw RFC822 header line
     */
    public void addHeaderLine(String line) {
  try {
      char c = line.charAt(0);
      if (c == ' ' || c == '\t') {
    InternetHeader h =
        (InternetHeader)headers.get(headers.size() - 1);
    h.line += "\r\n" + line;
      } else
    headers.add(new InternetHeader(line));
  } catch (StringIndexOutOfBoundsException e) {
      // line is empty, ignore it
      return;
  } catch (NoSuchElementException e) {
      // XXX - vector is empty?
  }
    }

    /**
     * Return all the header lines as an Enumeration of Strings.
     */
    public Enumeration getAllHeaderLines() {
  return (getNonMatchingHeaderLines(null));
    }

    /**
     * Return all matching header lines as an Enumeration of Strings.
     */
    public Enumeration getMatchingHeaderLines(String[] names) {
  return (new matchEnum(headers, names, true, true))
    }

    /**
     * Return all non-matching header lines
     */
    public Enumeration getNonMatchingHeaderLines(String[] names) {
  return (new matchEnum(headers, names, false, true));
    }
}
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