com.meltmedia.jackson.crypto.EncryptedJsonDeserializer.java Source code

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Here is the source code for com.meltmedia.jackson.crypto.EncryptedJsonDeserializer.java

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/**
 * Copyright (C) 2014 meltmedia (christian.trimble@meltmedia.com)
 *
 * 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 com.meltmedia.jackson.crypto;

import java.io.IOException;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.Map;

import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.core.ObjectCodec;
import com.fasterxml.jackson.databind.BeanDescription;
import com.fasterxml.jackson.databind.BeanProperty;
import com.fasterxml.jackson.databind.DeserializationConfig;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonDeserializer;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.deser.BeanDeserializerBuilder;
import com.fasterxml.jackson.databind.deser.BeanDeserializerModifier;
import com.fasterxml.jackson.databind.deser.ContextualDeserializer;
import com.fasterxml.jackson.databind.deser.SettableBeanProperty;

public class EncryptedJsonDeserializer extends JsonDeserializer<Object> implements ContextualDeserializer {

    private EncryptionService<EncryptedJson> service;
    private JsonDeserializer<Object> baseDeser;
    private Encrypted annotation;
    private BeanProperty property;
    private ObjectCodec valueParser;

    public EncryptedJsonDeserializer(EncryptionService<EncryptedJson> service, Encrypted annotation,
            JsonDeserializer<Object> baseDeser) {
        this.service = service;
        this.annotation = annotation;
        this.baseDeser = baseDeser;
    }

    public EncryptedJsonDeserializer(EncryptionService<EncryptedJson> service, Encrypted encrypt,
            JsonDeserializer<Object> wrapped, BeanProperty property) {
        this.service = service;
        this.annotation = encrypt;
        this.baseDeser = wrapped;
        this.property = property;
    }

    @Override
    public Object deserialize(JsonParser parser, DeserializationContext context)
            throws IOException, JsonProcessingException {
        JsonDeserializer<?> deser = baseDeser;
        if (deser instanceof ContextualDeserializer) {
            deser = ((ContextualDeserializer) deser).createContextual(context, property);
        }
        return service.decrypt(parser, deser, context, property.getType());
    }

    @Override
    public JsonDeserializer<?> createContextual(DeserializationContext context, BeanProperty property)
            throws JsonMappingException {
        return new EncryptedJsonDeserializer(service, annotation, baseDeser, property);
    }

    public static class Modifier extends BeanDeserializerModifier {
        private Map<String, EncryptionService<EncryptedJson>> sourceMap = new LinkedHashMap<>();

        public Modifier() {
        }

        public Modifier addSource(EncryptionService<EncryptedJson> source) {
            sourceMap.put(source.getName(), source);
            return this;
        }

        @Override
        public BeanDeserializerBuilder updateBuilder(DeserializationConfig config, BeanDescription beanDesc,
                BeanDeserializerBuilder builder) {
            Iterator<SettableBeanProperty> beanPropertyIterator = builder.getProperties();
            while (beanPropertyIterator.hasNext()) {
                SettableBeanProperty settableBeanProperty = beanPropertyIterator.next();
                Encrypted encrypted = settableBeanProperty.getAnnotation(Encrypted.class);
                if (encrypted == null)
                    continue;

                String source = encrypted.source();
                EncryptionService<EncryptedJson> service = sourceMap.get(source);
                if (service == null) {
                    throw new IllegalArgumentException(
                            String.format("No encryption key source defined for %s.", source));
                }
                JsonDeserializer<Object> current = settableBeanProperty.getValueDeserializer();
                builder.addOrReplaceProperty(settableBeanProperty
                        .withValueDeserializer(new EncryptedJsonDeserializer(service, encrypted, current)), true);
            }
            return builder;
        }

    }
}