/*
 * $Header: /home/cvs/jakarta-commons/httpclient/src/java/org/apache/commons/httpclient/HttpURL.java,v 1.17 2004/05/02 15:19:15 mbecke Exp $
 * $Revision: 1.17 $
 * $Date: 2004/05/02 15:19:15 $
 *
 * ====================================================================
 *
 *  Copyright 2002-2004 The Apache Software Foundation
 *
 *  Licensed 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.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 */

package org.apache.commons.httpclient;

import org.apache.commons.httpclient.util.URIUtil;

/**
 * The HTTP URL.
 *
 * @author <a href="mailto:jericho at apache.org">Sung-Gu</a>
 * @author <a href="mailto:mbowler@GargoyleSoftware.com">Mike Bowler</a>
 */
public class HttpURL extends URI {

    // ----------------------------------------------------------- Constructors

    /** Create an instance as an internal use. */
    protected HttpURL() {
    }


    /**
     * Construct a HTTP URL as an escaped form of a character array with the
     * given charset to do escape encoding.
     *
     * @param escaped the HTTP URL character sequence
     * @param charset the charset string to do escape encoding
     * @throws URIException If {@link #checkValid()} fails
     * @throws NullPointerException if <code>escaped</code> is <code>null</code>
     * @see #getProtocolCharset
     */
    public HttpURL(char[] escaped, String charset)
        throws URIException, NullPointerException {
        protocolCharset = charset;
        parseUriReference(new String(escaped), true);
        checkValid();
    }


    /**
     * Construct a HTTP URL as an escaped form of a character array.
     *
     * @param escaped the HTTP URL character sequence
     * @throws URIException If {@link #checkValid()} fails
     * @throws NullPointerException if <code>escaped</code> is <code>null</code>
     * @see #getDefaultProtocolCharset
     */
    public HttpURL(char[] escaped) throws URIException, NullPointerException {
        parseUriReference(new String(escaped), true);
        checkValid();
    }


    /**
     * Construct a HTTP URL from a given string with the given charset to do
     * escape encoding.
     *
     * @param original the HTTP URL string
     * @param charset the charset string to do escape encoding
     * @throws URIException If {@link #checkValid()} fails
     * @see #getProtocolCharset
     */
    public HttpURL(String original, String charset) throws URIException {
        protocolCharset = charset;
        parseUriReference(original, false);
        checkValid();
    }


    /**
     * Construct a HTTP URL from a given string.
     *
     * @param original the HTTP URL string
     * @throws URIException If {@link #checkValid()} fails
     * @see #getDefaultProtocolCharset
     */
    public HttpURL(String original) throws URIException {
        parseUriReference(original, false);
        checkValid();
    }


    /**
     * Construct a HTTP URL from given components.
     *
     * @param host the host string
     * @param port the port number
     * @param path the path string
     * @throws URIException If {@link #checkValid()} fails
     * @see #getDefaultProtocolCharset
     */
    public HttpURL(String host, int port, String path) throws URIException {
        this(null, host, port, path, null, null);
        checkValid();
    }


    /**
     * Construct a HTTP URL from given components.
     *
     * @param host the host string
     * @param port the port number
     * @param path the path string
     * @param query the query string
     * @throws URIException If {@link #checkValid()} fails
     * @see #getDefaultProtocolCharset
     */
    public HttpURL(String host, int port, String path, String query)
        throws URIException {

        this(null, host, port, path, query, null);
        checkValid();
    }


    /**
     * Construct a HTTP URL from given components.
     *
     * @param user the user name
     * @param password his or her password
     * @param host the host string
     * @throws URIException If {@link #checkValid()} fails
     * @see #getDefaultProtocolCharset
     */
    public HttpURL(String user, String password, String host)
        throws URIException {

        this((user == null) ? null : user 
            + ((password == null) ? "" : ':' +  password),
                host, -1, null, null, null);
        checkValid();
    }


    /**
     * Construct a HTTP URL from given components.
     *
     * @param user the user name
     * @param password his or her password
     * @param host the host string
     * @param port the port number
     * @throws URIException If {@link #checkValid()} fails
     * @see #getDefaultProtocolCharset
     */
    public HttpURL(String user, String password, String host, int port)
        throws URIException {

        this((user == null) ? null : user 
            + ((password == null) ? "" : ':' +  password),
                host, port, null, null, null);
        checkValid();
    }


    /**
     * Construct a HTTP URL from given components.
     *
     * @param user the user name
     * @param password his or her password
     * @param host the host string
     * @param port the port number
     * @param path the path string
     * @throws URIException If {@link #checkValid()} fails
     * @see #getDefaultProtocolCharset
     */
    public HttpURL(String user, String password, String host, int port,
            String path) throws URIException {

        this((user == null) ? null : user 
            + ((password == null) ? "" : ':' +  password),
                host, port, path, null, null);
        checkValid();
    }


    /**
     * Construct a HTTP URL from given components.
     *
     * @param user the user name
     * @param password his or her password
     * @param host the host string
     * @param port the port number
     * @param path the path string
     * @param query The query string.
     * @throws URIException If {@link #checkValid()} fails
     * @see #getDefaultProtocolCharset
     */
    public HttpURL(String user, String password, String host, int port,
            String path, String query) throws URIException {

        this((user == null) ? null : user 
            + ((password == null) ? "" : ':' + password),
                host, port, path, query, null);
        checkValid();
    }


    /**
     * Construct a HTTP URL from given components.
     *
     * @param host the host string
     * @param path the path string
     * @param query the query string
     * @param fragment the fragment string
     * @throws URIException If {@link #checkValid()} fails
     * @see #getDefaultProtocolCharset
     */
    public HttpURL(String host, String path, String query, String fragment)
        throws URIException {

        this(null, host, -1, path, query, fragment);
        checkValid();
    }


    /**
     * Construct a HTTP URL from given components.
     *
     * @param userinfo the userinfo string
     * @param host the host string
     * @param path the path string
     * @param query the query string
     * @param fragment the fragment string
     * @throws URIException If {@link #checkValid()} fails
     * @see #getDefaultProtocolCharset
     */
    public HttpURL(String userinfo, String host, String path, String query,
            String fragment) throws URIException {

        this(userinfo, host, -1, path, query, fragment);
        checkValid();
    }


    /**
     * Construct a HTTP URL from given components.
     *
     * @param userinfo the userinfo string
     * @param host the host string
     * @param port the port number
     * @param path the path string
     * @throws URIException If {@link #checkValid()} fails
     * @see #getDefaultProtocolCharset
     */
    public HttpURL(String userinfo, String host, int port, String path)
        throws URIException {

        this(userinfo, host, port, path, null, null);
        checkValid();
    }


    /**
     * Construct a HTTP URL from given components.
     *
     * @param userinfo the userinfo string
     * @param host the host string
     * @param port the port number
     * @param path the path string
     * @param query the query string
     * @throws URIException If {@link #checkValid()} fails
     * @see #getDefaultProtocolCharset
     */
    public HttpURL(String userinfo, String host, int port, String path,
            String query) throws URIException {

        this(userinfo, host, port, path, query, null);
        checkValid();
    }


    /**
     * Construct a HTTP URL from given components.
     *
     * @param userinfo the userinfo string
     * @param host the host string
     * @param port the port number
     * @param path the path string
     * @param query the query string
     * @param fragment the fragment string
     * @throws URIException If {@link #checkValid()} fails
     * @see #getDefaultProtocolCharset
     */
    public HttpURL(String userinfo, String host, int port, String path,
            String query, String fragment) throws URIException {

        // validate and contruct the URI character sequence
        StringBuffer buff = new StringBuffer();
        if (userinfo != null || host != null || port != -1) {
            _scheme = DEFAULT_SCHEME; // in order to verify the own protocol
            buff.append(_default_scheme);
            buff.append("://");
            if (userinfo != null) {
                buff.append(URIUtil.encode(userinfo, URI.allowed_userinfo));
                buff.append('@');
            }
            if (host != null) {
                buff.append(URIUtil.encode(host, URI.allowed_host));
                if (port != -1 || port != DEFAULT_PORT) {
                    buff.append(':');
                    buff.append(port);
                }
            }
        }
        if (path != null) {  // accept empty path
            if (scheme != null && !path.startsWith("/")) {
                throw new URIException(URIException.PARSING,
                        "abs_path requested");
            }
            buff.append(URIUtil.encode(path, URI.allowed_abs_path));
        }
        if (query != null) {
            buff.append('?');
            buff.append(URIUtil.encode(query, URI.allowed_query));
        }
        if (fragment != null) {
            buff.append('#');
            buff.append(URIUtil.encode(fragment, URI.allowed_fragment));
        }
        parseUriReference(buff.toString(), true);
        checkValid();
    }


    /**
     * Construct a HTTP URL with a given relative URL string.
     *
     * @param base the base HttpURL
     * @param relative the relative HTTP URL string
     * @throws URIException If {@link #checkValid()} fails
     */
    public HttpURL(HttpURL base, String relative) throws URIException {
        this(base, new HttpURL(relative));
    }


    /**
     * Construct a HTTP URL with a given relative URL.
     *
     * @param base the base HttpURL
     * @param relative the relative HttpURL
     * @throws URIException If {@link #checkValid()} fails
     */
    public HttpURL(HttpURL base, HttpURL relative) throws URIException {
        super(base, relative);
        checkValid();
    }

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

    /**
     * Default scheme for HTTP URL.
     */
    public static final char[] DEFAULT_SCHEME = { 'h', 't', 't', 'p' };

    /**
     * Default scheme for HTTP URL.
     * @deprecated Use {@link #DEFAULT_SCHEME} instead.  This one doesn't
     * conform to the project naming conventions.
     */
    public static final char[] _default_scheme = DEFAULT_SCHEME;

    /**
     * Default port for HTTP URL.
     */
    public static final int DEFAULT_PORT = 80;

    /**
     * Default port for HTTP URL.
     * @deprecated Use {@link #DEFAULT_PORT} instead.  This one doesn't conform
     * to the project naming conventions.
     */
    public static final int _default_port = DEFAULT_PORT;

    /**
     * The serialVersionUID.
     */
    static final long serialVersionUID = -7158031098595039459L;

    // ------------------------------------------------------------- The scheme

    /**
     * Get the scheme.  You can get the scheme explicitly.
     *
     * @return the scheme
     */
    public char[] getRawScheme() {
        return (_scheme == null) ? null : HttpURL.DEFAULT_SCHEME;
    }


    /**
     * Get the scheme.  You can get the scheme explicitly.
     *
     * @return the scheme null if empty or undefined
     */
    public String getScheme() {
        return (_scheme == null) ? null : new String(HttpURL.DEFAULT_SCHEME);
    }

    // --------------------------------------------------------------- The port

    /**
     * Get the port number.
     * @return the port number
     */
    public int getPort() {
        return (_port == -1) ? HttpURL.DEFAULT_PORT : _port;
    }

    // ----------------------------------------------------------- The userinfo

    /**
     * Set the raw-escaped user and password.
     *
     * @param escapedUser the raw-escaped user
     * @param escapedPassword the raw-escaped password; could be null
     * @throws URIException escaped user not valid or user required; escaped
     * password not valid or username missed
     */
    public void setRawUserinfo(char[] escapedUser, char[] escapedPassword)
        throws URIException {

        if (escapedUser == null || escapedUser.length == 0) {
            throw new URIException(URIException.PARSING, "user required");
        }
        if (!validate(escapedUser, within_userinfo) 
            || ((escapedPassword != null) 
            && !validate(escapedPassword, within_userinfo))) {
            throw new URIException(URIException.ESCAPING,
                    "escaped userinfo not valid");
        }
        String username = new String(escapedUser);
        String password = (escapedPassword == null) 
            ? null : new String(escapedPassword);
        String userinfo = username + ((password == null) ? "" : ":" + password);
        String hostname = new String(getRawHost());
        String hostport = (_port == -1) ? hostname : hostname + ":" + _port;
        String authority = userinfo + "@" + hostport;
        _userinfo = userinfo.toCharArray();
        _authority = authority.toCharArray();
        setURI();
    }


    /**
     * Set the raw-escaped user and password.
     *
     * @param escapedUser the escaped user
     * @param escapedPassword the escaped password; could be null
     * @throws URIException escaped user not valid or user required; escaped
     * password not valid or username missed
     * @throws NullPointerException null user
     */
    public void setEscapedUserinfo(String escapedUser, String escapedPassword)
        throws URIException, NullPointerException {

        setRawUserinfo(escapedUser.toCharArray(), (escapedPassword == null) 
            ? null : escapedPassword.toCharArray());
    }


    /**
     * Set the user and password.
     *
     * @param user the user
     * @param password the password; could be null
     * @throws URIException encoding error or username missed
     * @throws NullPointerException null user
     */
    public void setUserinfo(String user, String password) 
        throws URIException, NullPointerException {
        // set the charset to do escape encoding
        String charset = getProtocolCharset();
        setRawUserinfo(encode(user, within_userinfo, charset),
                (password == null) 
                ? null 
                : encode(password, within_userinfo, charset));
    }


    /**
     * Set the raw-escaped user.
     *
     * @param escapedUser the raw-escaped user
     * @throws URIException escaped user not valid or user required
     */
    public void setRawUser(char[] escapedUser) throws URIException {
        if (escapedUser == null || escapedUser.length == 0) {
            throw new URIException(URIException.PARSING, "user required");
        }
        if (!validate(escapedUser, within_userinfo)) {
            throw new URIException(URIException.ESCAPING,
                    "escaped user not valid");
        }
        String username = new String(escapedUser);
        String password = new String(getRawPassword());
        String userinfo = username + ((password == null) ? "" : ":" + password);
        String hostname = new String(getRawHost());
        String hostport = (_port == -1) ? hostname : hostname + ":" + _port;
        String authority = userinfo + "@" + hostport;
        _userinfo = userinfo.toCharArray();
        _authority = authority.toCharArray();
        setURI();
    }


    /**
     * Set the escaped user string.
     *
     * @param escapedUser the escaped user string
     * @throws URIException escaped user not valid
     * @throws NullPointerException null user
     */
    public void setEscapedUser(String escapedUser)
        throws URIException, NullPointerException {
        setRawUser(escapedUser.toCharArray());
    }


    /**
     * Set the user string.
     *
     * @param user the user string
     * @throws URIException user encoding error
     * @throws NullPointerException null user
     */
    public void setUser(String user) throws URIException, NullPointerException {
        setRawUser(encode(user, allowed_within_userinfo, getProtocolCharset()));
    }


    /**
     * Get the raw-escaped user.
     *
     * @return the raw-escaped user
     */
    public char[] getRawUser() {
        if (_userinfo == null || _userinfo.length == 0) {
            return null;
        }
        int to = indexFirstOf(_userinfo, ':');
        // String.indexOf(':', 0, _userinfo.length, _userinfo, 0, 1, 0);
        if (to == -1) {
            return _userinfo; // only user.
        }
        char[] result = new char[to];
        System.arraycopy(_userinfo, 0, result, 0, to);
        return result;
    }


    /**
     * Get the escaped user
     *
     * @return the escaped user
     */
    public String getEscapedUser() {
        char[] user = getRawUser();
        return (user == null) ? null : new String(user);
    }


    /**
     * Get the user.
     *
     * @return the user name
     * @throws URIException If {@link #decode} fails
     */
    public String getUser() throws URIException {
        char[] user = getRawUser();
        return (user == null) ? null : decode(user, getProtocolCharset());
    }


    /**
     * Set the raw-escaped password.
     *
     * @param escapedPassword the raw-escaped password; could be null
     * @throws URIException escaped password not valid or username missed
     */
    public void setRawPassword(char[] escapedPassword) throws URIException {
        if (escapedPassword != null 
            && !validate(escapedPassword, within_userinfo)) {
            throw new URIException(URIException.ESCAPING,
               "escaped password not valid");
        }
        if (getRawUser() == null || getRawUser().length == 0) {
            throw new URIException(URIException.PARSING, "username required");
        }
        String username = new String(getRawUser());
        String password = new String(escapedPassword);
        // an emtpy string is allowed as a password
        String userinfo = username + ((password == null) ? "" : ":" + password);
        String hostname = new String(getRawHost());
        String hostport = (_port == -1) ? hostname : hostname + ":" + _port;
        String authority = userinfo + "@" + hostport;
        _userinfo = userinfo.toCharArray();
        _authority = authority.toCharArray();
        setURI();
    }


    /**
     * Set the escaped password string.
     *
     * @param escapedPassword the escaped password string; could be null
     * @throws URIException escaped password not valid or username missed
     */
    public void setEscapedPassword(String escapedPassword) throws URIException {
        setRawPassword((escapedPassword == null) ? null 
            : escapedPassword.toCharArray());
    }


    /**
     * Set the password string.
     *
     * @param password the password string; could be null
     * @throws URIException encoding error or username missed
     */
    public void setPassword(String password) throws URIException {
        setRawPassword((password == null) ? null : encode(password,
                    allowed_within_userinfo, getProtocolCharset()));
    }


    /**
     * Get the raw-escaped password.
     *
     * @return the raw-escaped password
     */
    public char[] getRawPassword() {
        int from = indexFirstOf(_userinfo, ':');
        if (from == -1) {
            return null; // null or only user.
        }
        int len = _userinfo.length - from - 1;
        char[] result = new char[len];
        System.arraycopy(_userinfo, from + 1, result, 0, len);
        return result;
    }


    /**
     * Get the escaped password.
     *
     * @return the escaped password
     */
    public String getEscapedPassword() {
        char[] password = getRawPassword();
        return (password == null) ? null : new String(password);
    }


    /**
     * Get the password.
     *
     * @return the password
     * @throws URIException If {@link #decode(char[],String)} fails.
     */
    public String getPassword() throws URIException {
        char[] password = getRawPassword();
        return (password == null) ? null : decode(password,
                getProtocolCharset());
    }

    // --------------------------------------------------------------- The path

    /**
     * Get the raw-escaped current hierarchy level.
     *
     * @return the raw-escaped current hierarchy level
     * @throws URIException If {@link #getRawCurrentHierPath(char[])} fails.
     */
    public char[] getRawCurrentHierPath() throws URIException {
        return (_path == null || _path.length == 0) ? rootPath 
            : super.getRawCurrentHierPath(_path);
    }


    /**
     * Get the level above the this hierarchy level.
     *
     * @return the raw above hierarchy level
     * @throws URIException If {@link #getRawCurrentHierPath(char[])} fails.
     */
    public char[] getRawAboveHierPath() throws URIException {
        char[] path = getRawCurrentHierPath();
        return (path == null || path.length == 0) ? rootPath : getRawCurrentHierPath(path);
    }


    /**
     * Get the raw escaped path.
     *
     * @return the path '/' if empty or undefined
     */
    public char[] getRawPath() {
        char[] path =  super.getRawPath();
        return (path == null || path.length == 0) ? rootPath : path;
    }

    // -------------------------------------------------------------- The query

    /**
     * Set the query as the name and value pair.
     *
     * @param queryName the query string.
     * @param queryValue the query string.
     * @throws URIException incomplete trailing escape pattern
     * Or unsupported character encoding
     * @throws NullPointerException null query
     * @see #encode
     */
    public void setQuery(String queryName, String queryValue)
        throws URIException, NullPointerException {

        StringBuffer buff = new StringBuffer();
        // set the charset to do escape encoding
        String charset = getProtocolCharset();
        buff.append(encode(queryName, allowed_within_query, charset));
        buff.append('=');
        buff.append(encode(queryValue, allowed_within_query, charset));
        _query = buff.toString().toCharArray();
        setURI();
    }


    /**
     * Set the query as the name and value pairs.
     *
     * @param queryName the array of the query string.
     * @param queryValue the array of the query string.
     * @throws URIException incomplete trailing escape pattern,
     * unsupported character encoding or wrong array size
     * @throws NullPointerException null query
     * @see #encode
     */
    public void setQuery(String[] queryName, String[] queryValue)
        throws URIException, NullPointerException {

        int length = queryName.length;
        if (length != queryValue.length) {
            throw new URIException("wrong array size of query");
        }

        StringBuffer buff = new StringBuffer();
        // set the charset to do escape encoding
        String charset = getProtocolCharset();
        for (int i = 0; i < length; i++) {
            buff.append(encode(queryName[i], allowed_within_query, charset));
            buff.append('=');
            buff.append(encode(queryValue[i], allowed_within_query, charset));
            if (i + 1 < length) { 
                buff.append('&');
            }
        }
        _query = buff.toString().toCharArray();
        setURI();
    }

    // ---------------------------------------------------------------- Utility

    /**
     * Verify the valid class use for construction.
     *
     * @throws URIException the wrong scheme use
     */
    protected void checkValid() throws URIException {
        // could be explicit protocol or undefined.
        if (!(equals(_scheme, DEFAULT_SCHEME) || _scheme == null)) {
            throw new URIException(URIException.PARSING, "wrong class use");
        }
    }

}