/*
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You under the Apache License, Version 2.0
 *  (the "License"); you may not use this file except in compliance with
 *  the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

package org.apache.coyote.ajp;

import java.util.Hashtable;

import org.apache.tomcat.util.buf.ByteChunk;


/**
 * Constants.
 *
 * @author Remy Maucherat
 */
public final class Constants {


    // -------------------------------------------------------------- Constants


    /**
     * Package name.
     */
    public static final String Package = "org.apache.coyote.ajp";

    public static final int DEFAULT_CONNECTION_LINGER = -1;
    public static final int DEFAULT_CONNECTION_TIMEOUT = -1;
    public static final int DEFAULT_CONNECTION_UPLOAD_TIMEOUT = 300000;
    public static final int DEFAULT_SERVER_SOCKET_TIMEOUT = 0;
    public static final boolean DEFAULT_TCP_NO_DELAY = true;

    // Prefix codes for message types from server to container
    public static final byte JK_AJP13_FORWARD_REQUEST   = 2;
    public static final byte JK_AJP13_SHUTDOWN          = 7;
    public static final byte JK_AJP13_PING_REQUEST      = 8;
    public static final byte JK_AJP13_CPING_REQUEST     = 10;

    // Prefix codes for message types from container to server
    public static final byte JK_AJP13_SEND_BODY_CHUNK   = 3;
    public static final byte JK_AJP13_SEND_HEADERS      = 4;
    public static final byte JK_AJP13_END_RESPONSE      = 5;
    public static final byte JK_AJP13_GET_BODY_CHUNK    = 6;
    public static final byte JK_AJP13_CPONG_REPLY       = 9;

    // Integer codes for common response header strings
    public static final int SC_RESP_CONTENT_TYPE        = 0xA001;
    public static final int SC_RESP_CONTENT_LANGUAGE    = 0xA002;
    public static final int SC_RESP_CONTENT_LENGTH      = 0xA003;
    public static final int SC_RESP_DATE                = 0xA004;
    public static final int SC_RESP_LAST_MODIFIED       = 0xA005;
    public static final int SC_RESP_LOCATION            = 0xA006;
    public static final int SC_RESP_SET_COOKIE          = 0xA007;
    public static final int SC_RESP_SET_COOKIE2         = 0xA008;
    public static final int SC_RESP_SERVLET_ENGINE      = 0xA009;
    public static final int SC_RESP_STATUS              = 0xA00A;
    public static final int SC_RESP_WWW_AUTHENTICATE    = 0xA00B;
    public static final int SC_RESP_AJP13_MAX           = 11;

    // Integer codes for common (optional) request attribute names
    public static final byte SC_A_CONTEXT       = 1;  // XXX Unused
    public static final byte SC_A_SERVLET_PATH  = 2;  // XXX Unused
    public static final byte SC_A_REMOTE_USER   = 3;
    public static final byte SC_A_AUTH_TYPE     = 4;
    public static final byte SC_A_QUERY_STRING  = 5;
    public static final byte SC_A_JVM_ROUTE     = 6;
    public static final byte SC_A_SSL_CERT      = 7;
    public static final byte SC_A_SSL_CIPHER    = 8;
    public static final byte SC_A_SSL_SESSION   = 9;
    public static final byte SC_A_SSL_KEYSIZE   = 11;
    public static final byte SC_A_SECRET        = 12;
    public static final byte SC_A_STORED_METHOD = 13;

    // Used for attributes which are not in the list above
    public static final byte SC_A_REQ_ATTRIBUTE = 10;

    /**
     * AJP private request attributes
     */
    public static final String SC_A_REQ_LOCAL_ADDR  = "AJP_LOCAL_ADDR";
    public static final String SC_A_REQ_REMOTE_PORT = "AJP_REMOTE_PORT";

    // Terminates list of attributes
    public static final byte SC_A_ARE_DONE      = (byte)0xFF;

    // Ajp13 specific -  needs refactoring for the new model

    /**
     * Default maximum total byte size for a AJP packet
     */
    public static final int MAX_PACKET_SIZE = 8192;
    /**
     * Size of basic packet header
     */
    public static final int H_SIZE = 4;

    /**
     * Size of the header metadata
     */
    public static final int  READ_HEAD_LEN = 6;
    public static final int  SEND_HEAD_LEN = 8;

    /**
     * Default maximum size of data that can be sent in one packet
     */
    public static final int  MAX_READ_SIZE = MAX_PACKET_SIZE - READ_HEAD_LEN;
    public static final int  MAX_SEND_SIZE = MAX_PACKET_SIZE - SEND_HEAD_LEN;

    // Translates integer codes to names of HTTP methods
    public static final String []methodTransArray = {
            "OPTIONS",
            "GET",
            "HEAD",
            "POST",
            "PUT",
            "DELETE",
            "TRACE",
            "PROPFIND",
            "PROPPATCH",
            "MKCOL",
            "COPY",
            "MOVE",
            "LOCK",
            "UNLOCK",
            "ACL",
            "REPORT",
            "VERSION-CONTROL",
            "CHECKIN",
            "CHECKOUT",
            "UNCHECKOUT",
            "SEARCH",
            "MKWORKSPACE",
            "UPDATE",
            "LABEL",
            "MERGE",
            "BASELINE-CONTROL",
            "MKACTIVITY"
    };
    public static final int SC_M_JK_STORED = (byte) 0xFF;

    // id's for common request headers
    public static final int SC_REQ_ACCEPT          = 1;
    public static final int SC_REQ_ACCEPT_CHARSET  = 2;
    public static final int SC_REQ_ACCEPT_ENCODING = 3;
    public static final int SC_REQ_ACCEPT_LANGUAGE = 4;
    public static final int SC_REQ_AUTHORIZATION   = 5;
    public static final int SC_REQ_CONNECTION      = 6;
    public static final int SC_REQ_CONTENT_TYPE    = 7;
    public static final int SC_REQ_CONTENT_LENGTH  = 8;
    public static final int SC_REQ_COOKIE          = 9;
    public static final int SC_REQ_COOKIE2         = 10;
    public static final int SC_REQ_HOST            = 11;
    public static final int SC_REQ_PRAGMA          = 12;
    public static final int SC_REQ_REFERER         = 13;
    public static final int SC_REQ_USER_AGENT      = 14;
    // AJP14 new header
    public static final byte SC_A_SSL_KEY_SIZE  = 11; // XXX ???

    // Translates integer codes to request header names
    public static final String []headerTransArray = {
            "accept",
            "accept-charset",
            "accept-encoding",
            "accept-language",
            "authorization",
            "connection",
            "content-type",
            "content-length",
            "cookie",
            "cookie2",
            "host",
            "pragma",
            "referer",
            "user-agent"
    };

    // Translates integer codes to response header names
    public static final String []responseTransArray = {
            "Content-Type",
            "Content-Language",
            "Content-Length",
            "Date",
            "Last-Modified",
            "Location",
            "Set-Cookie",
            "Set-Cookie2",
            "Servlet-Engine",
            "Status",
            "WWW-Authenticate"
    };

    private static final Hashtable<String,Integer>  responseTransHash =
        new Hashtable<String,Integer>(20);

    static {
        try {
            int i;
            for (i = 0; i < SC_RESP_AJP13_MAX; i++) {
                responseTransHash.put(responseTransArray[i],
                                      new Integer(0xA001 + i));
            }
        }
        catch (Exception e) {
            // Do nothing
        }
    }    

    public static final int getResponseAjpIndex(String header)
    {
        Integer i = responseTransHash.get(header);
        if (i == null)
            return 0;
        else
            return i.intValue();
    }

    
    /**
     * CRLF.
     */
    public static final String CRLF = "\r\n";


    /**
     * Server string.
     */
    public static final byte[] SERVER_BYTES =
        ByteChunk.convertToBytes("Server: Apache-Coyote/1.1" + CRLF);


    /**
     * CR.
     */
    public static final byte CR = (byte) '\r';


    /**
     * LF.
     */
    public static final byte LF = (byte) '\n';


    /**
     * SP.
     */
    public static final byte SP = (byte) ' ';


    /**
     * HT.
     */
    public static final byte HT = (byte) '\t';


    /**
     * COLON.
     */
    public static final byte COLON = (byte) ':';


    /**
     * 'A'.
     */
    public static final byte A = (byte) 'A';


    /**
     * 'a'.
     */
    public static final byte a = (byte) 'a';


    /**
     * 'Z'.
     */
    public static final byte Z = (byte) 'Z';


    /**
     * '?'.
     */
    public static final byte QUESTION = (byte) '?';


    /**
     * Lower case offset.
     */
    public static final byte LC_OFFSET = A - a;


    /**
     * Default HTTP header buffer size.
     */
    public static final int DEFAULT_HTTP_HEADER_BUFFER_SIZE = 48 * 1024;


    /* Various constant "strings" */
    public static final byte[] CRLF_BYTES = ByteChunk.convertToBytes(CRLF);
    public static final byte[] COLON_BYTES = ByteChunk.convertToBytes(": ");
    public static final String CONNECTION = "Connection";
    public static final String CLOSE = "close";
    public static final byte[] CLOSE_BYTES =
        ByteChunk.convertToBytes(CLOSE);
    public static final String KEEPALIVE = "keep-alive";
    public static final byte[] KEEPALIVE_BYTES =
        ByteChunk.convertToBytes(KEEPALIVE);
    public static final String CHUNKED = "chunked";
    public static final byte[] ACK_BYTES =
        ByteChunk.convertToBytes("HTTP/1.1 100 Continue" + CRLF + CRLF);
    public static final String TRANSFERENCODING = "Transfer-Encoding";
    public static final byte[] _200_BYTES =
        ByteChunk.convertToBytes("200");
    public static final byte[] _400_BYTES =
        ByteChunk.convertToBytes("400");
    public static final byte[] _404_BYTES =
        ByteChunk.convertToBytes("404");


    /**
     * Identity filters (input and output).
     */
    public static final int IDENTITY_FILTER = 0;


    /**
     * Chunked filters (input and output).
     */
    public static final int CHUNKED_FILTER = 1;


    /**
     * Void filters (input and output).
     */
    public static final int VOID_FILTER = 2;


    /**
     * GZIP filter (output).
     */
    public static final int GZIP_FILTER = 3;


    /**
     * Buffered filter (input)
     */
    public static final int BUFFERED_FILTER = 3;


    /**
     * HTTP/1.0.
     */
    public static final String HTTP_10 = "HTTP/1.0";


    /**
     * HTTP/1.1.
     */
    public static final String HTTP_11 = "HTTP/1.1";
    public static final byte[] HTTP_11_BYTES =
        ByteChunk.convertToBytes(HTTP_11);


    /**
     * GET.
     */
    public static final String GET = "GET";


    /**
     * HEAD.
     */
    public static final String HEAD = "HEAD";


    /**
     * POST.
     */
    public static final String POST = "POST";


}
