Integrate CryptoUtils into ONAP common

Update junit to add test cases

Change-Id: If3236853138a05faac5f51a859b935265c14f0d6
Issue-ID: POLICY-1945
Signed-off-by: Chou, Joseph (jc2555) <jc2555@att.com>

1 files changed, 139 insertions, 0 deletions

diff --git a/utils/src/main/java/org/onap/policy/common/utils/coder/PropertyCoder.java b/utils/src/main/java/org/onap/policy/common/utils/coder/PropertyCoder.java
new file mode 100644
index 00000000..7b3c16d3
--- /dev/null
+++ b/utils/src/main/java/org/onap/policy/common/utils/coder/PropertyCoder.java
@@ -0,0 +1,139 @@
+/*
+ * ============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;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * 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) throws CoderException {
+        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) throws CoderException {
+        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) throws CoderException {
+            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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