/**
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2006 Sun Microsystems Inc. All Rights Reserved
 *
 * The contents of this file are subject to the terms
 * of the Common Development and Distribution License
 * (the License). You may not use this file except in
 * compliance with the License.
 *
 * You can obtain a copy of the License at
 * https://opensso.dev.java.net/public/CDDLv1.0.html or
 * opensso/legal/CDDLv1.0.txt
 * See the License for the specific language governing
 * permission and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL
 * Header Notice in each file and include the License file
 * at opensso/legal/CDDLv1.0.txt.
 * If applicable, add the following below the CDDL Header,
 * with the fields enclosed by brackets [] replaced by
 * your own identifying information:
 * "Portions Copyrighted [year] [name of copyright owner]"
 *
 * $Id: CookieUtils.java,v 1.9 2009/11/03 00:50:34 madan_ranganath Exp $
 *
 */

/**
 * Portions Copyrighted 2013 ForgeRock, Inc.
 */
package com.sun.identity.saml2.idpdiscovery;

import java.io.IOException;
import java.util.ResourceBundle;
import java.util.StringTokenizer;
import javax.servlet.http.Cookie;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.sun.identity.shared.encode.URLEncDec;
import com.sun.identity.shared.locale.Locale;


/**
 * Implements utility methods for handling Cookie.
 * <p>
 */ 

public class CookieUtils {
    static boolean secureCookie =
        (SystemProperties.get(IDPDiscoveryConstants.AM_COOKIE_SECURE)
            != null &&
        SystemProperties.get(IDPDiscoveryConstants.AM_COOKIE_SECURE).
           equalsIgnoreCase("true"));

    static boolean cookieHttpOnly =
        (SystemProperties.get(IDPDiscoveryConstants.AM_COOKIE_HTTPONLY) 
            != null) &&
        (SystemProperties.get(IDPDiscoveryConstants.AM_COOKIE_HTTPONLY).
            equalsIgnoreCase("true"));

    static boolean cookieEncoding =
        (SystemProperties.get(IDPDiscoveryConstants.AM_COOKIE_ENCODE)
           != null &&
        SystemProperties.get(IDPDiscoveryConstants.AM_COOKIE_ENCODE).
           equalsIgnoreCase("true"));

    private static int defAge = -1;
    public static Debug debug = Debug.getInstance("libIDPDiscovery");
    // IDP Discovery Resource bundle
    public static final String BUNDLE_NAME = "libIDPDiscovery";
    // The resource bundle for IDP Discovery implementation.
    public static ResourceBundle bundle = Locale.getInstallResourceBundle(BUNDLE_NAME);
    // error processing URL, read from system property
    private static String errorUrl = System.getProperty(
        IDPDiscoveryConstants.ERROR_URL_PARAM_NAME);

    /**
     * Gets property value of "com.iplanet.am.cookie.secure"
     *
     * @return the property value of "com.iplanet.am.cookie.secure"
     */
    public static boolean isCookieSecure() {
        return secureCookie;
    }

    /**
     * Gets property value of "com.sun.identity.cookie.httponly"
     *
     * @return the property value of "com.sun.identity.cookie.httponly"
     */
    public static boolean isCookieHttpOnly() {
        return cookieHttpOnly;
    }

    public static boolean isSAML2(HttpServletRequest req) {
        // check this is for idff or saml2
        String reqURI = req.getRequestURI(); 
        boolean bIsSAML2 = true; 
        if (reqURI.endsWith(IDPDiscoveryConstants.IDFF_READER_URI) ||
            reqURI.endsWith(IDPDiscoveryConstants.IDFF_WRITER_URI)) { 
            bIsSAML2 = false; 
        }
        return bIsSAML2;
    }

    /**
     * Gets value of cookie that has mached name in servlet request
     *
     * @param req HttpServletRequest request
     * @param name cookie name in servlet request
     * @return value of that name of cookie
     */
    public static String getCookieValueFromReq(
        HttpServletRequest req,
        String name
    ) {
        String cookieValue = null;
        try {
            Cookie cookies[] = req.getCookies();
            if (cookies != null) {
                for (int nCookie = 0; nCookie < cookies.length; nCookie++) {
                    if (cookies[nCookie].getName().equalsIgnoreCase(name)) {
                        cookieValue = cookies[nCookie].getValue();
                        break;
                    }
                }
        
                // Check property value and it decode value
                // Bea, IBM
                if (cookieEncoding && (cookieValue != null)) {
                    cookieValue= URLEncDec.decode(cookieValue);
                }
            } else {
                debug.message("No Cookie is in the request");
            }
        } catch (Exception e) {
            debug.error("Error getting cookie  : " , e);
        }
        
        // check this is for idff or saml2
        boolean bIsSAML2 = isSAML2(req);

        // take care of the case where there is a '+' in preferred idp
        // When '+' is decoded, it became ' ' which is also the seperator
        // of different preferred idps
        if (cookieValue == null) {
            return cookieValue;
        } else {
            StringBuffer result = new StringBuffer(200);
            StringTokenizer st = new StringTokenizer(cookieValue, " ");
            while (st.hasMoreTokens()) {
                String curIdpString = (String)st.nextToken();
                while (!bIsSAML2 && curIdpString.length() < 28 && 
                    st.hasMoreTokens()) {
                    curIdpString = curIdpString + "+" + (String) st.nextToken();
                }
                result.append(curIdpString + " ");
            }
            if (debug.messageEnabled()) {
                debug.message("CookieUtils:cookieValue=" + cookieValue
                        + ", result=" + result.toString());
            }
            return result.toString().trim();
        }
    }
              
        
    /**
     * Constructs a cookie with a specified name and value.
     *
     * @param name  a String specifying the name of the cookie
     *
     * @param value  a String specifying the value of the cookie
     *
     * @return constructed cookie
     */
    public static Cookie newCookie(String name, String value) {
        return newCookie(name, value, defAge, null, null);
    }
    
    /**
     * Constructs a cookie with a specified name and value and sets
     * the maximum age of the cookie in seconds.
     *
     * @param name  a String specifying the name of the cookie
     *
     * @param value  a String specifying the value of the cookie
     *
     * @param maxAge an integer specifying the maximum age of the cookie in 
     * seconds; if negative, means the cookie is not stored; 
     * if zero, deletes the cookie
     *
     * @return constructed cookie
     */
    public static Cookie newCookie(String name, String value, int maxAge) {
        return newCookie(name, value, maxAge, null, null);
    }

    /**
     * Constructs a cookie with a specified name and value and sets
     * a path for the cookie to which the client should return the cookie.
     *
     * @param name  a String specifying the name of the cookie
     *
     * @param value  a String specifying the value of the cookie
     *
     * @param path a String specifying a path 
     *
     * @return constructed cookie
     */
    public static Cookie newCookie(String name, String value, String path) {
        return newCookie(name, value, defAge, path, null);
    }

    /**
     * Constructs a cookie with a specified name and value and sets
     * a path for the cookie to which the client should return the cookie
     * and sets the domain within which this cookie should be presented.
     *
     * @param name  a String specifying the name of the cookie
     *
     * @param value  a String specifying the value of the cookie
     *
     * @param path a String specifying a path 
     *
     * @param domain a String containing the domain name within which 
     * this cookie is visible; form is according to <code>RFC 2109</code>
     *
     * @return constructed cookie
     */
    public static Cookie newCookie
                  (String name, String value, String path, String domain) {
        return newCookie(name, value, defAge, path, domain);
    }

    /**
     * Constructs a cookie with a specified name and value and sets
     * the maximum age of the cookie in seconds and sets
     * a path for the cookie to which the client should return the cookie
     * and sets the domain within which this cookie should be presented.
     *
     * @param name  a String specifying the name of the cookie
     *
     * @param value  a String specifying the value of the cookie
     *
     * @param maxAge an integer specifying the maximum age of the cookie in 
     * seconds; if negative, means the cookie is not stored; 
     * if zero, deletes the cookie
     *
     * @param path a String specifying a path 
     *
     * @param domain a String containing the domain name within which 
     * this cookie is visible; form is according to RFC 2109
     *
     * @return constructed cookie
     */
    public static Cookie newCookie
      (String name, String value, int maxAge, String path, String domain) {
        Cookie cookie = null;
        
        // Based on property value it does url encoding.
        // BEA, IBM
        if (cookieEncoding) {
            cookie = new Cookie(name, URLEncDec.encode(value));
        } else {
            cookie = new Cookie(name, value);
        }

        cookie.setMaxAge(maxAge);

        if ((path != null) && (path.length() > 0)) {
            cookie.setPath(path);
        } else {
            cookie.setPath("/");
        }
            
        if ((domain != null) && (domain.length() > 0)) {
            cookie.setDomain(domain);
        }

        cookie.setSecure(isCookieSecure());
            
        return cookie;
    }
    
    /**
     * Gets the preferred cookie name based on the HttpRequest URI. 
     *
     * @param reqURI  a String specifying the HttpRequest URI.
     *
     * @return the preferred cookie name.
     *         _saml_idp if the HttpRequest URI matches the SAML2 
     *         reader or writer servlet uri. 
     *         _liberty_idp if the HttpRequest URI matches the IDFF 
     *         reader or writer servlet uri. 
     *         return empty string if no above match found. 
     *         return null if the input HttpRequest uri is null or empty.
     */
    public static String getPreferCookieName( String reqURI) 
    {
       if (reqURI != null &&  !reqURI.equals("")) { 
           if (reqURI.endsWith(IDPDiscoveryConstants.IDFF_READER_URI) ||
               reqURI.endsWith(IDPDiscoveryConstants.IDFF_WRITER_URI)) { 
               return(IDPDiscoveryConstants.IDFF_COOKIE_NAME); 
           } else if (reqURI.endsWith(
               IDPDiscoveryConstants.SAML2_READER_URI) ||
               reqURI.endsWith(IDPDiscoveryConstants.SAML2_WRITER_URI)) { 
               return(IDPDiscoveryConstants.SAML2_COOKIE_NAME);
           } else {
               return "";
           }
        } else {
            return null;
        }
    }       


    /**
     * Sends to error page URL for processing. If the error page is
     * hosted in the same web application, forward is used with parameters.
     * Otherwise, redirection is used with parameters. 
     * Three parameters are passed to the error URL:
     *  -- errorcode : Error key, this is the I18n key of the error message.
     *  -- httpstatuscode : Http status code for the error
     *  -- message : detailed I18n'd error message 
     * @param request HttpServletRequest object
     * @param response HttpServletResponse object
     * @param httpStatusCode Http Status code
     * @param errorCode Error code
     * @param errorMsg Detailed error message
     */ 
    public static void sendError(HttpServletRequest request,
        HttpServletResponse response, int httpStatusCode,
        String errorCode, String errorMsg) {
        if ((errorUrl == null) || (errorUrl.length() == 0)) {
            // no error processing URL set, use sendError
            try {
                response.sendError(httpStatusCode, errorMsg);
                return;
            } catch (IOException ioe) {
                debug.error("CookieUtils.sendError", ioe);
            }
        } else {
            // construct final URL
            String jointString = "?";
            if (errorUrl.indexOf("?") != -1) {
                jointString = "&";
            }
            String newUrl = errorUrl.trim() + jointString
                    + "errorcode=" + errorCode + "&"
                    + "httpstatuscode=" + httpStatusCode + "&"
                    + "errormessage=" + URLEncDec.encode(errorMsg);
            if (debug.messageEnabled()) {
                debug.message("CookieUtils.sendError: final redirectionURL="
                        + newUrl);
            }
            String tmp = errorUrl.toLowerCase();
            if (tmp.startsWith("http://") || tmp.startsWith("https://")) {
                // send redirect
                try {
                    response.sendRedirect(newUrl);
                } catch (IOException e) {
                    debug.error("CookieUtils.sendError: Exception "
                            + "occured while trying to redirect to resource:"
                            + newUrl, e);
                }
            } else {
                // use forward
                try {
                    RequestDispatcher dispatcher =
                            request.getRequestDispatcher(newUrl);
                    dispatcher.forward(request, response);
                } catch (ServletException e) {
                    debug.error("CookieUtils.sendError: Exception "
                            + "occured while trying to forward to resource:"
                            + newUrl, e);
                } catch (IOException e) {
                    debug.error("CookieUtils.sendError: Exception "
                            + "occured while trying to forward to resource:"
                            + newUrl, e);
                }
            }
        }
    }

    /**
     * Add cookie to HttpServletResponse as custom header
     * 
     * @param response
     * @param cookie
     */
    public static void addCookieToResponse(HttpServletResponse response,
            Cookie cookie) {
        if (cookie == null) {
            return;
        }
        if (!isCookieHttpOnly()) {
            response.addCookie(cookie);
            return;
        }

        // Once JavaEE6 is available, the following code can be simplified
        // to be one line response.addCookie(cookie)
        StringBuffer sb = new StringBuffer(150);
        sb.append(cookie.getName()).append("=").append(cookie.getValue());
        String path = cookie.getPath();
        if (path != null && path.length() > 0) {
            sb.append(";path=").append(path);
        } else {
            sb.append(";path=/");
        }
        String domain = cookie.getDomain();
        if (domain != null && domain.length() > 0) {
            sb.append(";domain=").append(domain);
        }
        int age = cookie.getMaxAge();
        if (age > -1) {
            sb.append(";max-age=").append(age);
        }
        if (CookieUtils.isCookieSecure()) {
            sb.append(";secure");
        }
        sb.append(";httponly");
        if (debug.messageEnabled()) {
            debug.message("CookieUtils:addCookieToResponse adds " + sb);
        }
        response.addHeader("SET-COOKIE", sb.toString());
    }
}