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/*
 * Copyright (c) 2017, 2020 Oracle and/or its affiliates and others.
 * All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0, which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 *
 * This Source Code may also be made available under the following Secondary
 * Licenses when the conditions for such availability set forth in the
 * Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
 * version 2 with the GNU Classpath Exception, which is available at
 * https://www.gnu.org/software/classpath/license.html.
 *
 * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
 */

package jakarta.servlet.annotation;

import jakarta.servlet.annotation.ServletSecurity.EmptyRoleSemantic;
import jakarta.servlet.annotation.ServletSecurity.TransportGuarantee;
import java.lang.annotation.Documented;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;

/**
 * This annotation is used within the {@link ServletSecurity} annotation to represent security constraints on specific
 * HTTP protocol messages.
 *
 * @since Servlet 3.0
 */
@Documented
@Retention(RetentionPolicy.RUNTIME)
public @interface HttpMethodConstraint {

    /**
     * Http protocol method name
     *
     * @return the name of an HTTP protocol method. value may not be null, or the empty string, and must be a
     * legitimate HTTP Method name as defined by RFC 2616.
     */
    String value();

    /**
     * The default authorization semantic. This value is insignificant when rolesAllowed returns a non-empty
     * array, and should not be specified when a non-empty array is specified for rolesAllowed.
     *
     * @return the {@link EmptyRoleSemantic} to be applied when rolesAllowed returns an empty (that is,
     * zero-length) array.
     */
    EmptyRoleSemantic emptyRoleSemantic() default EmptyRoleSemantic.PERMIT;

    /**
     * The data protection requirements (i.e., whether or not SSL/TLS is required) that must be satisfied by the connections
     * on which requests arrive.
     *
     * @return the {@link TransportGuarantee} indicating the data protection that must be provided by the connection.
     */
    TransportGuarantee transportGuarantee() default TransportGuarantee.NONE;

    /**
     * The names of the authorized roles.
     *
     * Duplicate role names appearing in rolesAllowed are insignificant and may be discarded during runtime processing of
     * the annotation. The String "*" has no special meaning as a role name (should it occur in rolesAllowed).
     *
     * @return an array of zero or more role names. When the array contains zero elements, its meaning depends on the value
     * returned by emptyRoleSemantic. If emptyRoleSemantic returns DENY, and
     * rolesAllowed returns a zero length array, access is to be denied independent of authentication state and
     * identity. Conversely, if emptyRoleSemantic returns PERMIT, it indicates that access is to
     * be allowed independent of authentication state and identity. When the array contains the names of one or more roles,
     * it indicates that access is contingent on membership in at least one of the named roles (independent of the value
     * returned by emptyRoleSemantic).
     */
    String[] rolesAllowed() default {};
}