/*-
 * -\-\-
 * Helios Services
 * --
 * Copyright (C) 2016 Spotify AB
 * --
 * 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 com.spotify.helios.master;

import com.spotify.helios.master.resources.RequestUser;
import com.sun.jersey.api.core.HttpContext;
import com.sun.jersey.core.spi.component.ComponentContext;
import com.sun.jersey.core.spi.component.ComponentScope;
import com.sun.jersey.server.impl.inject.AbstractHttpContextInjectable;
import com.sun.jersey.spi.inject.Injectable;
import com.sun.jersey.spi.inject.InjectableProvider;
import java.lang.reflect.Type;
import java.util.List;
import javax.ws.rs.ext.Provider;

@Provider
public class UserProvider extends AbstractHttpContextInjectable<String>
    implements InjectableProvider<RequestUser, Type> {

  @Override
  public String getValue(HttpContext arg0) {
    final List<String> usernames = arg0.getRequest().getQueryParameters().get("user");
    if (usernames.isEmpty()) {
      return null;
    }
    return usernames.get(0);
  }

  @Override
  public Injectable<?> getInjectable(ComponentContext ctx, RequestUser ruAnnotation, Type type) {
    if (type.equals(String.class)) {
      return this;
    }
    return null;
  }

  @Override
  public ComponentScope getScope() {
    return ComponentScope.PerRequest;
  }
}
