/*
 *  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.jk.common;


/**
 * Common class for the AJP Protocol values
 */

public class AjpConstants {
    // Prefix codes for message types from server to container
    /**
     * Message code for initial Request packet
     */
    public static final byte JK_AJP13_FORWARD_REQUEST   = 2;
    /**
     * Message code for a request to shutdown Tomcat
     */
    public static final byte JK_AJP13_SHUTDOWN          = 7;
    /**
     * Message code for a Ping request (obsolete)
     */
    public static final byte JK_AJP13_PING_REQUEST      = 8;
    /**
     * Message code for a CPing request
     */
    public static final byte JK_AJP13_CPING_REQUEST     = 10;

    // Prefix codes for message types from container to server
    /**
     * Response code that the package is part of the Response body
     */
    public static final byte JK_AJP13_SEND_BODY_CHUNK   = 3;
    /**
     * Response code that the package is the HTTP headers
     */
    public static final byte JK_AJP13_SEND_HEADERS      = 4;
    /**
     * Response code for EOT
     */
    public static final byte JK_AJP13_END_RESPONSE      = 5;
    /**
     * Response code to request the next Request body chunk
     */
    public static final byte JK_AJP13_GET_BODY_CHUNK    = 6;
    /**
     * Response code to reply to a CPing
     */
    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;
        
    // 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
    /**
     * Request Attribute is passed as a String
     */
    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;
    
    /**
     * 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"
    };

    /**
     * Request Method is passed as a String
     */
    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"
    };
    // Ajp13 specific -  needs refactoring for the new model
    /**
     * 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;  
    /**
     * Maximum size of data that can be sent in one packet
     */
    public static final int  MAX_READ_SIZE = MAX_PACKET_SIZE - H_SIZE - 2;

}
