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Spring Framework on Google Cloud

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/*
 * Copyright 2017-2018 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
 *
 *      https://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.google.cloud.spring.autoconfigure.config;

import java.nio.charset.StandardCharsets;
import java.util.Base64;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * Expected response format for Google Runtime Configurator API response.
 *
 * @since 1.1
 */
class GoogleConfigEnvironment {

  private List variables;

  GoogleConfigEnvironment() {}

  List getVariables() {
    if (variables == null) {
      return Collections.emptyList();
    }
    return this.variables;
  }

  void setVariables(List variables) {
    this.variables = variables;
  }

  Map getConfig() {
    Map config = new HashMap<>();
    for (Variable variable : getVariables()) {
      Object value = (variable.getText() != null) ? variable.getText() : variable.getValue();
      config.put(variable.getName(), value);
    }
    return config;
  }

  /** A data object for a configuration. */
  static class Variable {

    private String name;

    private String text;

    private String value;

    private String updateTime;

    Variable() {}

    String getName() {
      return this.name;
    }

    public void setName(String name) {
      if (name != null) {
        // use short variable name instead of {project/config/variable} path
        String[] variableNameSplit = name.split("/");
        if (variableNameSplit.length > 0) {
          this.name = variableNameSplit[variableNameSplit.length - 1];
        }
      }
    }

    String getText() {
      return this.text;
    }

    void setText(String text) {
      this.text = text;
    }

    String getValue() {
      return this.value;
    }

    void setValue(String value) {
      if (value != null) {
        this.value = decode(value);
      }
    }

    String getUpdateTime() {
      return this.updateTime;
    }

    void setUpdateTime(String updateTime) {
      this.updateTime = updateTime;
    }

    private String decode(String value) {
      byte[] decodedValue = Base64.getDecoder().decode(value);
      return new String(decodedValue, StandardCharsets.UTF_8);
    }
  }
}