org.springframework.security.jackson2.UserDeserializer.java Source code

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Here is the source code for org.springframework.security.jackson2.UserDeserializer.java

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/*
 * Copyright 2015-2016 the original author or authors.
 *
 * 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.springframework.security.jackson2;

import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonDeserializer;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.node.MissingNode;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.security.core.authority.SimpleGrantedAuthority;
import org.springframework.security.core.userdetails.User;

import java.io.IOException;
import java.util.Set;

/**
 * Custom Deserializer for {@link User} class. This is already registered with {@link UserMixin}.
 * You can also use it directly with your mixin class.
 *
 * @author Jitendra Singh
 * @see UserMixin
 */
public class UserDeserializer extends JsonDeserializer<User> {

    /**
     * This method will create {@link User} object. It will ensure successful object creation even if password key is null in
     * serialized json, because credentials may be removed from the {@link User} by invoking {@link User#eraseCredentials()}.
     * In that case there won't be any password key in serialized json.
     */
    @Override
    public User deserialize(JsonParser jp, DeserializationContext ctxt)
            throws IOException, JsonProcessingException {
        ObjectMapper mapper = (ObjectMapper) jp.getCodec();
        JsonNode jsonNode = mapper.readTree(jp);
        Set<GrantedAuthority> authorities = mapper.convertValue(jsonNode.get("authorities"),
                new TypeReference<Set<SimpleGrantedAuthority>>() {
                });
        return new User(readJsonNode(jsonNode, "username").asText(), readJsonNode(jsonNode, "password").asText(),
                readJsonNode(jsonNode, "enabled").asBoolean(),
                readJsonNode(jsonNode, "accountNonExpired").asBoolean(),
                readJsonNode(jsonNode, "credentialsNonExpired").asBoolean(),
                readJsonNode(jsonNode, "accountNonLocked").asBoolean(), authorities);
    }

    private JsonNode readJsonNode(JsonNode jsonNode, String field) {
        return jsonNode.has(field) ? jsonNode.get(field) : MissingNode.getInstance();
    }
}