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/*
* ============LICENSE_START=======================================================
* DCAEGEN2-SERVICES-SDK
* ================================================================================
* Copyright (C) 2021-2022 Nokia. 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.dcaegen2.services.sdk.rest.services.cbs.client.impl;
import com.google.gson.JsonArray;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonPrimitive;
import java.util.HashMap;
import java.util.Map.Entry;
import org.jetbrains.annotations.NotNull;
import org.onap.dcaegen2.services.sdk.rest.services.cbs.client.api.exceptions.EnvironmentParsingException;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* <p>Config Binding Service client environment variables parsing.</p>
*
* @since 1.8.4
*/
public class CbsClientEnvironmentParsing {
private static final Pattern shellEnvPattern = Pattern.compile("\\$\\{(.+?)}");
private CbsClientEnvironmentParsing() {
}
/**
* <p>
* This method will do a lookup of shell variables in provided jsonObject and replace it with found environment variables.
* </p>
* <p>
* In case of failure during resolving environment variables, EnvironmentParsingException is thrown.
* </p>
*
* @param jsonObject
* @return JsonObject
* @since 1.8.4
*/
public static JsonObject processEnvironmentVariables(JsonObject jsonObject) {
JsonObject jsonObjectCopy = jsonObject.deepCopy();
processJsonObject(jsonObjectCopy);
return jsonObjectCopy;
}
private static void processJsonObject(JsonObject jsonObject) {
for (Map.Entry<String, JsonElement> entry : jsonObject.entrySet()) {
processJsonObjectEntry(jsonObject, entry);
}
}
private static void processJsonObjectEntry(JsonObject jsonObject, Map.Entry<String, JsonElement> entry) {
if (entry.getValue().isJsonArray()) {
processJsonArray(entry.getValue().getAsJsonArray());
} else if (entry.getValue().isJsonObject()) {
processJsonObject(entry.getValue().getAsJsonObject());
} else {
Map<String, String> systemEnvMatches = getSystemEnvMatches(entry);
if (systemEnvMatches.isEmpty()) {
return;
}
String result = getReplacedValue(entry.getValue().getAsString(), systemEnvMatches);
jsonObject.addProperty(entry.getKey(), result);
}
}
@NotNull
private static Map<String, String> getSystemEnvMatches(Entry<String, JsonElement> entry) {
Matcher matcher = getMatcher(entry.getValue().getAsString());
Map<String,String> systemEnvMatches = new HashMap<>();
while (matcher.find()) {
String stringTobeReplaced = matcher.group(0);
String systemEnv = matcher.group(1);
systemEnvMatches.put(stringTobeReplaced, systemEnv);
}
return systemEnvMatches;
}
private static String getReplacedValue(String inputValue, Map<String, String> systemEnvMatches) {
String result = inputValue;
for (Entry<String, String> valueToReplace : systemEnvMatches.entrySet()) {
result = result.replace(valueToReplace.getKey(), getValueFromSystemEnv(valueToReplace.getValue()));
}
return result;
}
private static void processJsonArray(JsonArray jsonArray) {
for (int i = 0; i < jsonArray.size(); i++) {
if (jsonArray.get(i).isJsonObject()) {
processJsonObject(jsonArray.get(i).getAsJsonObject());
} else if (jsonArray.get(i).isJsonArray()) {
processJsonArray(jsonArray.get(i).getAsJsonArray());
} else {
Matcher matcher = getMatcher(jsonArray.get(i).getAsString());
if (matcher.find()) {
jsonArray.set(i, new JsonPrimitive(getValueFromSystemEnv(matcher.group(1))));
}
}
}
}
private static Matcher getMatcher(String value) {
return shellEnvPattern.matcher(value);
}
private static String getValueFromSystemEnv( String envName) {
String envValue = System.getenv(envName);
if (envValue == null || "".equals(envValue)) {
throw new EnvironmentParsingException("Cannot read " + envName + " from environment.");
}
return envValue;
}
}
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