content: /*
   * Copyright 2013-2016 Agorava
   *
   * 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 org.agorava.oauth.settings;
  
  import org.agorava.api.exception.AgoravaException;
  import org.agorava.api.oauth.application.OAuthAppSettings;
  
  import java.io.IOException;
  import java.io.InputStream;
  import java.util.PropertyResourceBundle;
  import java.util.ResourceBundle;
  
  /**
   * This Builder creates a {@link OAuthAppSettings} from a {@link ResourceBundle}
   * The bundle name is "agorava" ("agorava.properties" filename) by default but can be customized through {@link #bundleName
   * (String)}
   * keys in the file must be :
   * <ul>
   * <li>apiKey</li>
   * <li>apiSecret</li>
   * <li>callback</li>
   * <li>scope</li>
   * </ul>
   * <p>
   * You can configure a prefix for the key with {@link #prefix(String)}. By default the prefix is empty
   *
   * @author Antoine Sabot-Durand
   * @author Werner Keil
   */
  public class PropertyOAuthAppSettingsBuilder extends SimpleOAuthAppSettingsBuilder {
  
      /**
       * Global constant to give type safe name for the bundleName property when used in {@link org.agorava.api.oauth
       * .application.OAuthApplication}
       */
      public static final String BUNDLE_NAME = "bundleName";
  
      /**
       * Global constant to give type safe name for the prefix property when used in {@link org.agorava.api.oauth
       * .application.OAuthApplication}
       */
      public static final String PREFIX = "prefix";
  
      private static final String[] bindingKeys = {API_KEY, API_SECRET};
  
      private static final String[] optionalKeys = {NAME, SCOPE, CALLBACK};
  
      private String bundleName = "agorava";
  
      private String prefix = "";
  
      /**
       * Set the bundle name to read settings from.
       * If it's not used, default bundle name will be 'agorava'
       *
       * @param bundleName name of the bundle
       * @return this builder
       */
      public PropertyOAuthAppSettingsBuilder bundleName(String bundleName) {
          this.bundleName = bundleName;
          return this;
      }
  
      /**
       * Set the prefix for the keys in the bundle
       * If it's not used, default prefix will be empty
       *
       * @param prefix to add to keys
       * @return this builder
       */
      public PropertyOAuthAppSettingsBuilder prefix(String prefix) {
          this.prefix = prefix.trim();
          return this;
      }
  
      public static ResourceBundle retrievePropertyBundle(String bundleName) {
              ClassLoader cl=Thread.currentThread().getContextClassLoader();
              InputStream is =cl.getResourceAsStream(bundleName+".properties");
          if(is==null) {
              throw new AgoravaException("Property file : " +bundleName+".properties, not found");
          }
              try {
                  return new PropertyResourceBundle(is);
              } catch (IOException e) {
                  throw new AgoravaException("Didn't found Agorava properties file",e);
              }
          }
      
      /**
       * {@inheritDoc} <p>
       * This implementation will build the {@link OAuthAppSettings} from a {@link ResourceBundle}
       * <p>
       * It'll first try to load all binding (mandatory) fields from the bundle by looking for the key prefix.fieldName (or
       * fieldName if prefix is empty)
       * <p>
       * In a second time it'll check if optional fields are present in the bundle (with the same key construction) and load
       * them if they are.
       * If they are not present it'll try to load them without prefix
       *
       * @return the built OAuthAppSettings
       * @throws java.util.MissingResourceException if the bundle can't be open
       * @throws AgoravaException                   if a binding field is missing in the bundle
       */
      @Override
      public OAuthAppSettings build() {
          String key;
          String value;
          ResourceBundle rb = retrievePropertyBundle(bundleName);
          String pref = "".equals(prefix) ? "" : prefix + ".";
  
          for (String k : bindingKeys) {
              key = pref + k;
              if (!rb.containsKey(key)) {
                  throw new AgoravaException("Unable to find binding key: " + key + " in bundle " + bundleName + " to build " +
                          "settings");
              }
              value = rb.getString(key);
  
              invokeSetter(k, value);
          }
  
          for (String k : optionalKeys) {
              key = pref + k;
              if (rb.containsKey(key)) {
                  value = rb.getString(key);
                  invokeSetter(k, value);
              } else if (rb.containsKey(k)) {
                  value = rb.getString(k);
                  invokeSetter(k, value);
              }
          }
  
          return super.build();
      }
  }
  