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// Portions Copyright [2017-2018] [Payara Foundation and/or its affiliates]
package org.apache.catalina;

import java.beans.PropertyChangeListener;
import java.io.IOException;
import java.security.Principal;
import java.security.cert.X509Certificate;

import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;

import org.apache.catalina.deploy.SecurityConstraint;
import org.glassfish.hk2.api.PerLookup;
import org.jvnet.hk2.annotations.Contract;


/**
 * A Realm is a read-only facade for an underlying security realm used to authenticate individual users, and
 * identify the security roles associated with those users. Realms can be attached at any Container level, but will
 * typically only be attached to a Context, or higher level, Container.
 *
 * @author Craig R. McClanahan
 * @version $Revision: 1.6 $ $Date: 2007/04/18 17:27:22 $
 */
@Contract
@PerLookup
public interface Realm {

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

    // START SJSAS 6202703
    /**
     * Flag indicating authentication is needed for current request. Used by preAuthenticateCheck method.
     */
    int AUTHENTICATE_NEEDED = 1;

    /**
     * Flag indicating authentication is not needed for current request. Used by preAuthenticateCheck method.
     */
    int AUTHENTICATE_NOT_NEEDED = 0;

    /**
     * Flag indicating the user has been authenticated but been denied access to the requested resource.
     */
    int AUTHENTICATED_NOT_AUTHORIZED = -1;

    // END SJSAS 6202703

    // ------------------------------------------------------------- Properties

    /**
     * Return the Container with which this Realm has been associated.
     */
    Container getContainer();

    /**
     * Set the Container with which this Realm has been associated.
     *
     * @param container The associated Container
     */
    void setContainer(Container container);

    /**
     * Return descriptive information about this Realm implementation and the corresponding version number, in the format
     * <description>/<version>.
     */
    String getInfo();

    // --------------------------------------------------------- Public Methods

    /**
     * Add a property change listener to this component.
     *
     * @param listener The listener to add
     */
    void addPropertyChangeListener(PropertyChangeListener listener);

    /**
     * Return the Principal associated with the specified username and credentials, if there is one; otherwise return
     * null.
     *
     * @param username Username of the Principal to look up
     * @param credentials Password or other credentials to use in authenticating this username
     */
    Principal authenticate(String username, char[] credentials);

    /**
     * Return the Principal associated with the specified username, which matches the digest calculated using the given
     * parameters using the method described in RFC 2069; otherwise return null.
     *
     * @param username Username of the Principal to look up
     * @param digest Digest which has been submitted by the client
     * @param nonce Unique (or supposedly unique) token which has been used for this request
     * @param realm Realm name
     * @param md5a2 Second MD5 digest used to calculate the digest : MD5(Method + ":" + uri)
     */
    Principal authenticate(String username, char[] digest, String nonce, String nc, String cnonce, String qop, String realm,
            char[] md5a2);

    /**
     * Return the Principal associated with the specified chain of X509 client certificates. If there is none, return
     * null.
     *
     * @param certs Array of client certificates, with the first one in the array being the certificate of the client
     * itself.
     */
    Principal authenticate(X509Certificate certs[]);
    
    /**
     * Does digest authentication and returns the Principal associated with the username in the HTTP header.
     *
     * @param hreq HTTP servlet request.
     */
    Principal authenticate(HttpServletRequest hreq);

    /**
     * Return the SecurityConstraints configured to guard the request URI for this request, or null if there is
     * no such constraint.
     *
     * @param request Request we are processing
     */
    SecurityConstraint[] findSecurityConstraints(HttpRequest request, Context context);

    /**
     * Gets the security constraints configured by the given context for the given request URI and method.
     *
     * @param uri the request URI
     * @param method the request method
     * @param context the context
     *
     * @return the security constraints configured by the given context for the given request URI and method, or null
     */
    SecurityConstraint[] findSecurityConstraints(String uri, String method, Context context);

    /**
     * Perform access control based on the specified authorization constraint. Return true if this constraint
     * is satisfied and processing should continue, or false otherwise.
     *
     * @param request Request we are processing
     * @param response Response we are creating
     * @param constraint Security constraint we are enforcing
     * @param context Context to which client of this class is attached.
     *
     * @exception IOException if an input/output error occurs
     */
    boolean hasResourcePermission(HttpRequest request, HttpResponse response, SecurityConstraint[] constraint, Context context)
            throws IOException;

    /**
     * Return true if the specified Principal has the specified security role, within the context of this
     * Realm; otherwise return false.
     *
     * @param principal Principal for whom the role is to be checked
     * @param role Security role to be checked
     */
    boolean hasRole(Principal principal, String role);

    // START SJSAS 6232464
    /**
     * Return true if the specified Principal has the specified security role, within the context of this
     * Realm; otherwise return false.
     *
     * @param request Request we are processing
     * @param response Response we are creating
     * @param principal Principal for whom the role is to be checked
     * @param role Security role to be checked
     */
    boolean hasRole(HttpRequest request, HttpResponse response, Principal principal, String role);
    // END SJSAS 6232464

    // START SJSAS 6202703
    /**
     * Checks whether or not authentication is needed. Returns an int, one of AUTHENTICATE_NOT_NEEDED, AUTHENTICATE_NEEDED,
     * or AUTHENTICATED_NOT_AUTHORIZED.
     *
     * @param request Request we are processing
     * @param response Response we are creating
     * @param constraints Security constraint we are enforcing
     * @param disableProxyCaching whether or not to disable proxy caching for protected resources.
     * @param securePagesWithPragma true if we add headers which are incompatible with downloading office documents in IE
     * under SSL but which fix a caching problem in Mozill
     * @param ssoEnabled true if sso is enabled
     * @exception IOException if an input/output error occurs
     */
    int preAuthenticateCheck(HttpRequest request, HttpResponse response, SecurityConstraint[] constraints,
            boolean disableProxyCaching, boolean securePagesWithPragma, boolean ssoEnabled) throws IOException;

    /**
     * Authenticates the user making this request, based on the specified login configuration. Return true if
     * any specified requirements have been satisfied, or false if we have created a response challenge
     * already.
     *
     * @param request Request we are processing
     * @param response Response we are creating
     * @param context The Context to which client of this class is attached.
     * @param authenticator the current authenticator.
     * @param calledFromAuthenticate true if the call originates from HttpServletRequest.authenticate
     * @exception IOException if an input/output error occurs
     */
    boolean invokeAuthenticateDelegate(HttpRequest request, HttpResponse response, Context context, Authenticator authenticator,
            boolean calledFromAuthenticate) throws IOException;

    /**
     * Post authentication for given request and response.
     *
     * @param request Request we are processing
     * @param response Response we are creating
     * @param context The Context to which client of this class is attached.
     * @exception IOException if an input/output error occurs
     */
    boolean invokePostAuthenticateDelegate(HttpRequest request, HttpResponse response, Context context) throws IOException;

    // END SJSAS 6202703

    /**
     * Enforce any user data constraint required by the security constraint guarding this request URI. Return
     * true if this constraint was not violated and processing should continue, or false if we
     * have created a response already.
     *
     * @param request Request we are processing
     * @param response Response we are creating
     * @param constraint Security constraint being checked
     *
     * @exception IOException if an input/output error occurs
     */
    boolean hasUserDataPermission(HttpRequest request, HttpResponse response, SecurityConstraint[] constraint) throws IOException;

    /**
     * Checks if the given request URI and method are the target of any user-data-constraint with a transport-guarantee of
     * CONFIDENTIAL, and whether any such constraint is already satisfied.
     * 
     * If uri and method are null, then the URI and method of the given request are checked.
     *
     * If a user-data-constraint exists that is not satisfied, then the given request will be redirected to HTTPS.
     *
     * @param request the request that may be redirected
     * @param response the response that may be redirected
     * @param constraints the security constraints to check against
     * @param uri the request URI (minus the context path) to check
     * @param method the request method to check
     *
     * @return true if the request URI and method are not the target of any unsatisfied user-data-constraint with a
     * transport-guarantee of CONFIDENTIAL, and false if they are (in which case the given request will have been redirected
     * to HTTPS)
     */
    boolean hasUserDataPermission(HttpRequest request, HttpResponse response, SecurityConstraint[] constraints, String uri,
            String method) throws IOException;

    /**
     * Remove a property change listener from this component.
     *
     * @param listener The listener to remove
     */
    void removePropertyChangeListener(PropertyChangeListener listener);

    // BEGIN IASRI 4808401, 4934562
    /**
     * Return an alternate principal from the request if available.
     *
     * @param req The request object.
     * @return Alternate principal or null.
     */
    Principal getAlternatePrincipal(HttpRequest req);

    /**
     * Return an alternate auth type from the request if available.
     *
     * @param req The request object.
     * @return Alternate auth type or null.
     */
    String getAlternateAuthType(HttpRequest req);
    // END IASRI 4808401

    // BEGIN IASRI 4856062,4918627,4874504
    /**
     * Set the name of the associated realm.
     *
     * @param name the name of the realm.
     */
    void setRealmName(String name, String authMethod);

    /**
     * Returns the name of the associated realm.
     *
     * @return realm name or null if not set.
     */
    String getRealmName();

    // END IASRI 4856062,4918627,4874504

    /**
     * Returns whether the specified ServletContext indicates that security extension is enabled.
     * 
     * @param servletContext the ServletContext
     * @return true if security extension is enabled; false otherwise
     */
    boolean isSecurityExtensionEnabled(ServletContext servletContext);

    /**
     * Logs out.
     * 
     * @param hreq the HttpRequest
     */
    void logout(HttpRequest hreq);

}




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