org.juiser.spring.security.authentication.ClaimsGrantedAuthoritiesResolver.java Source code

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Here is the source code for org.juiser.spring.security.authentication.ClaimsGrantedAuthoritiesResolver.java

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/*
 * Copyright 2017 Les Hazlewood and the respective Juiser contributors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package org.juiser.spring.security.authentication;

import io.jsonwebtoken.Claims;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.security.core.authority.AuthorityUtils;
import org.springframework.util.Assert;
import org.springframework.util.CollectionUtils;

import java.util.Collection;
import java.util.Collections;
import java.util.function.Function;

/**
 * @since 1.0.0
 */
public class ClaimsGrantedAuthoritiesResolver implements Function<Claims, Collection<? extends GrantedAuthority>> {

    private Function<Claims, Collection<String>> authorityStringsResolver;

    public ClaimsGrantedAuthoritiesResolver(Function<Claims, Collection<String>> authorityStringsResolver) {
        Assert.notNull(authorityStringsResolver, "authorityStringsResolver cannot be null.");
        this.authorityStringsResolver = authorityStringsResolver;
    }

    @Override
    public Collection<? extends GrantedAuthority> apply(Claims claims) {

        Collection<String> authorityStrings = authorityStringsResolver.apply(claims);

        if (CollectionUtils.isEmpty(authorityStrings)) {
            return Collections.emptyList();
        }

        return AuthorityUtils.createAuthorityList(authorityStrings.toArray(new String[authorityStrings.size()]));
    }
}