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package javax.ws.rs.core;

import java.security.Principal;

/**
 * An injectable interface that provides access to security related
 * information.
 * 
 * @see Context
 */
public interface SecurityContext {
    
    /**
     * String identifier for Basic authentication. Value "BASIC"
     */
    public static final String BASIC_AUTH = "BASIC";
    
    /**
     * String identifier for Client Certificate authentication. Value "CLIENT_CERT"
     */
    public static final String CLIENT_CERT_AUTH	= "CLIENT_CERT";
    
    /**
     * String identifier for Digest authentication. Value "DIGEST"
     */
    public static final String DIGEST_AUTH = "DIGEST";
    
    /**
     * String identifier for Form authentication. Value "FORM"
     */
    public static final String FORM_AUTH = "FORM";

    /**
     * Returns a <code>java.security.Principal</code> object containing the 
     * name of the current authenticated user. If the user 
     * has not been authenticated, the method returns null.
     *
     * @return a <code>java.security.Principal</code> containing the name
     * of the user making this request; null if the user has not been 
     * authenticated
     * @throws java.lang.IllegalStateException if called outside the scope of a request
     */
    public Principal getUserPrincipal();
    
    /**
     * Returns a boolean indicating whether the authenticated user is included 
     * in the specified logical "role". If the user has not been authenticated,
     * the method returns <code>false</code>.
     *
     * @param role a <code>String</code> specifying the name of the role
     * @return a <code>boolean</code> indicating whether the user making 
     * the request belongs to a given role; <code>false</code> if the user
     * has not been authenticated
     * @throws java.lang.IllegalStateException if called outside the scope of a request
     */
    public boolean isUserInRole(String role);
    
    /**
     * Returns a boolean indicating whether this request was made 
     * using a secure channel, such as HTTPS.
     *
     * @return <code>true</code> if the request was made using a secure 
     * channel, <code>false</code> otherwise
     * @throws java.lang.IllegalStateException if called outside the scope of a request
     */
    public boolean isSecure();
    
    /**
     * Returns the string value of the authentication scheme used to protect 
     * the resource. If the resource is not authenticated, null is returned.
     * 
     * Values are the same as the CGI variable AUTH_TYPE
     * 
     * @return one of the static members BASIC_AUTH, FORM_AUTH, 
     * CLIENT_CERT_AUTH, DIGEST_AUTH (suitable for == comparison) or the 
     * container-specific string indicating the authentication scheme, 
     * or null if the request was not authenticated.
     * @throws java.lang.IllegalStateException if called outside the scope of a request
     */
    public String getAuthenticationScheme();
    
}