/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.jclouds.ec2.functions;

import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.common.io.BaseEncoding.base64;

import javax.inject.Singleton;

import com.google.common.base.Function;

/**
 * Binds base64 encodes the byte [] input
 */
@Singleton
public class ConvertUnencodedBytesToBase64EncodedString implements Function<Object, String> {

   @Override
   public String apply(Object from) {
      checkArgument(checkNotNull(from, "input") instanceof byte[], "this binder is only valid for byte []!");
      byte[] unencodedData = (byte[]) from;
      checkArgument(checkNotNull(unencodedData, "unencodedData").length <= 16 * 1024,
            "userData cannot be larger than 16kb");
      return base64().encode(unencodedData);
   }
}
