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package sun.net.www.protocol.http;

import java.net.URL;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.PasswordAuthentication;
import java.io.IOException;
import java.io.OutputStream;
import sun.net.www.HeaderParser;
import sun.misc.BASE64Encoder;

BasicAuthentication: Encapsulate an http server authentication using
the "basic" scheme.
Author:
Bill Foote/**
 * BasicAuthentication: Encapsulate an http server authentication using
 * the "basic" scheme.
 *
 * @author Bill Foote
 */


class BasicAuthentication extends AuthenticationInfo {

    private static final long serialVersionUID = 100L;

    
The authentication string for this host, port, and realm.  This is
a simple BASE64 encoding of "login:password".    /** The authentication string for this host, port, and realm.  This is
        a simple BASE64 encoding of "login:password".    */
    String auth;

    
Create a BasicAuthentication
/**
     * Create a BasicAuthentication
     */
    public BasicAuthentication(boolean isProxy, String host, int port,
                               String realm, PasswordAuthentication pw) {
        super(isProxy ? PROXY_AUTHENTICATION : SERVER_AUTHENTICATION,
              AuthScheme.BASIC, host, port, realm);
        String plain = pw.getUserName() + ":";
        byte[] nameBytes = null;
        try {
            nameBytes = plain.getBytes("ISO-8859-1");
        } catch (java.io.UnsupportedEncodingException uee) {
            assert false;
        }

        // get password bytes
        char[] passwd = pw.getPassword();
        byte[] passwdBytes = new byte[passwd.length];
        for (int i=0; i<passwd.length; i++)
            passwdBytes[i] = (byte)passwd[i];

        // concatenate user name and password bytes and encode them
        byte[] concat = new byte[nameBytes.length + passwdBytes.length];
        System.arraycopy(nameBytes, 0, concat, 0, nameBytes.length);
        System.arraycopy(passwdBytes, 0, concat, nameBytes.length,
                         passwdBytes.length);
        this.auth = "Basic " + (new BasicBASE64Encoder()).encode(concat);
        this.pw = pw;
    }

    
Create a BasicAuthentication
/**
     * Create a BasicAuthentication
     */
    public BasicAuthentication(boolean isProxy, String host, int port,
                               String realm, String auth) {
        super(isProxy ? PROXY_AUTHENTICATION : SERVER_AUTHENTICATION,
              AuthScheme.BASIC, host, port, realm);
        this.auth = "Basic " + auth;
    }

    
Create a BasicAuthentication
/**
     * Create a BasicAuthentication
     */
    public BasicAuthentication(boolean isProxy, URL url, String realm,
                                   PasswordAuthentication pw) {
        super(isProxy ? PROXY_AUTHENTICATION : SERVER_AUTHENTICATION,
              AuthScheme.BASIC, url, realm);
        String plain = pw.getUserName() + ":";
        byte[] nameBytes = null;
        try {
            nameBytes = plain.getBytes("ISO-8859-1");
        } catch (java.io.UnsupportedEncodingException uee) {
            assert false;
        }

        // get password bytes
        char[] passwd = pw.getPassword();
        byte[] passwdBytes = new byte[passwd.length];
        for (int i=0; i<passwd.length; i++)
            passwdBytes[i] = (byte)passwd[i];

        // concatenate user name and password bytes and encode them
        byte[] concat = new byte[nameBytes.length + passwdBytes.length];
        System.arraycopy(nameBytes, 0, concat, 0, nameBytes.length);
        System.arraycopy(passwdBytes, 0, concat, nameBytes.length,
                         passwdBytes.length);
        this.auth = "Basic " + (new BasicBASE64Encoder()).encode(concat);
        this.pw = pw;
    }

    
Create a BasicAuthentication
/**
     * Create a BasicAuthentication
     */
    public BasicAuthentication(boolean isProxy, URL url, String realm,
                                   String auth) {
        super(isProxy ? PROXY_AUTHENTICATION : SERVER_AUTHENTICATION,
              AuthScheme.BASIC, url, realm);
        this.auth = "Basic " + auth;
    }

    
Returns:
true if this authentication supports preemptive authorization/**
     * @return true if this authentication supports preemptive authorization
     */
    @Override
    public boolean supportsPreemptiveAuthorization() {
        return true;
    }

    
Set header(s) on the given connection. This will only be called for
definitive (i.e. non-preemptive) authorization.
Params:
conn – The connection to apply the header(s) to
p – A source of header values for this connection, if needed.
raw – The raw header values for this connection, if needed.
Returns:
true if all goes well, false if no headers were set./**
     * Set header(s) on the given connection. This will only be called for
     * definitive (i.e. non-preemptive) authorization.
     * @param conn The connection to apply the header(s) to
     * @param p A source of header values for this connection, if needed.
     * @param raw The raw header values for this connection, if needed.
     * @return true if all goes well, false if no headers were set.
     */
    @Override
    public boolean setHeaders(HttpURLConnection conn, HeaderParser p, String raw) {
        conn.setAuthenticationProperty(getHeaderName(), getHeaderValue(null,null));
        return true;
    }

    
Returns:
the value of the HTTP header this authentication wants set/**
     * @return the value of the HTTP header this authentication wants set
     */
    @Override
    public String getHeaderValue(URL url, String method) {
        /* For Basic the authorization string does not depend on the request URL
         * or the request method
         */
        return auth;
    }

    
For Basic Authentication, the security parameters can never be stale.
In other words there is no possibility to reuse the credentials.
They are always either valid or invalid.
/**
     * For Basic Authentication, the security parameters can never be stale.
     * In other words there is no possibility to reuse the credentials.
     * They are always either valid or invalid.
     */
    @Override
    public boolean isAuthorizationStale (String header) {
        return false;
    }

    
Returns:
the common root path between npath and path.
This is used to detect when we have an authentication for two
paths and the root of th authentication space is the common root./**
     * @return the common root path between npath and path.
     * This is used to detect when we have an authentication for two
     * paths and the root of th authentication space is the common root.
     */

    static String getRootPath(String npath, String opath) {
        int index = 0;
        int toindex;

        /* Must normalize so we don't get confused by ../ and ./ segments */
        try {
            npath = new URI (npath).normalize().getPath();
            opath = new URI (opath).normalize().getPath();
        } catch (URISyntaxException e) {
            /* ignore error and use the old value */
        }

        while (index < opath.length()) {
            toindex = opath.indexOf('/', index+1);
            if (toindex != -1 && opath.regionMatches(0, npath, 0, toindex+1))
                index = toindex;
            else
                return opath.substring(0, index+1);
        }
        /*should not reach here. If we do simply return npath*/
        return npath;
    }

    /* It is never expected that the header value will exceed the bytesPerLine */
    private class BasicBASE64Encoder extends BASE64Encoder {
        @Override
        protected int bytesPerLine() {
            return (10000);
        }
    }
}