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package de.yourinspiration.spring.jwt;

import java.util.Optional;

import javax.servlet.http.HttpServletRequest;

/**
 * Provides access to JWT tokens in web requests and generates JWT token for a
 * given subject.
 * 
 * @author Marcel Härle - [email protected]
 *
 */
public interface JwtService {

    /**
     * Creates a JWT token for the given subject.
     * 
     * @param subject
     *            the subject must not be null
     * @return returns a token object containing the JWT token
     */
    Token createTokenFromSubject(final String subject);

    /**
     * Parses the subject from a JWT token. The JWT token must be provided as a
     * HTTP header named x-access-token.
     * 
     * @param request
     *            the request containing the JWT token
     * @return returns the parsed subject, or an empty optional if the token
     *         could not be found or parsed
     */
    Optional getJwtSubject(HttpServletRequest request);

    /**
     * Authenticates the given request.
     * 
     * @param request
     *            the request
     * @param roles
     *            the roles for authentication
     * @return returns true if the request was authenticated,
     *         otherwise false
     */
    boolean authenticate(HttpServletRequest request, String[] roles);

    /**
     * Get the attribute name for the request subject attribute.
     * 
     * @return the attribute name
     */
    String getRequestAttribute();

}