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/*
* ============LICENSE_START=======================================================
* ONAP PAP
* ================================================================================
* Copyright (C) 2019 AT&T Intellectual Property. All rights reserved.
* ================================================================================
* 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.
* ============LICENSE_END=========================================================
*/
package org.onap.policy.common.utils.coder;
import com.google.gson.Gson;
import com.google.gson.JsonArray;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonPrimitive;
import java.io.Reader;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
import lombok.AccessLevel;
import lombok.Getter;
import org.apache.commons.lang3.StringUtils;
import org.onap.policy.common.utils.security.CryptoCoder;
import org.onap.policy.common.utils.security.CryptoUtils;
/**
* JSON encoder and decoder using the "property" mechanism, which is currently gson.
*
*/
public class PropertyCoder {
/**
* Gson object used to encode and decode messages.
*/
@Getter(AccessLevel.PROTECTED)
private static final Gson GSON = new Gson();
/**
* Decode json for encrypted password.
*
* @param json string
* @param keyProperty contains property within jsonObject for secretKey
* @param clazz class T object
* @return a class T object
*/
public <T> T decode(String json, String keyProperty, Class<T> clazz) {
JsonElement jsonElement = GSON.fromJson(json, JsonElement.class);
return new MyDecoder(jsonElement, keyProperty).decrypt(jsonElement, clazz);
}
public <T> T decode(Reader reader, String keyProperty, Class<T> clazz) {
JsonElement jsonElement = GSON.fromJson(reader, JsonElement.class);
return new MyDecoder(jsonElement, keyProperty).decrypt(jsonElement, clazz);
}
private static class MyDecoder extends StandardCoder {
private CryptoCoder crypto = null;
MyDecoder(JsonElement jsonElement, String keyProperty) {
if (!jsonElement.isJsonObject()) {
return;
}
JsonObject jsonObject = jsonElement.getAsJsonObject();
// Use keyProperty from input to retrieve secretKey
String secretKey = jsonObject.get(keyProperty).getAsString();
if (!StringUtils.isBlank(secretKey)) {
crypto = new CryptoUtils(secretKey);
}
}
private <T> T decrypt(JsonElement jsonElement, Class<T> clazz) {
if (crypto == null) {
return fromJson(jsonElement, clazz);
}
JsonElement newElement = decrypt(jsonElement);
return fromJson(newElement, clazz);
}
private JsonElement decrypt(JsonElement jsonElement) {
if (jsonElement.isJsonObject()) {
return decryptObject(jsonElement.getAsJsonObject());
}
if (jsonElement.isJsonArray()) {
return decryptArray(jsonElement.getAsJsonArray());
}
if (!jsonElement.getAsJsonPrimitive().isString()) {
return jsonElement;
}
String value = jsonElement.getAsString();
if (!value.startsWith("enc:")) {
return jsonElement;
}
if (crypto != null) {
value = crypto.decrypt(value);
}
return new JsonPrimitive(value);
}
private JsonArray decryptArray(JsonArray jsonArray) {
if (crypto == null) {
return jsonArray;
}
JsonArray newArray = new JsonArray();
for (JsonElement element: jsonArray) {
newArray.add(decrypt(element));
}
return newArray;
}
private JsonObject decryptObject(JsonObject jsonObject) {
if (crypto == null) {
return jsonObject;
}
JsonObject newObject = new JsonObject();
Set<Entry<String, JsonElement>> entrySet = jsonObject.entrySet();
for (Map.Entry<String, JsonElement> entry : entrySet) {
String key = entry.getKey();
JsonElement jsonElement = decrypt(entry.getValue());
newObject.add(key, jsonElement);
}
return newObject;
}
}
}
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