/*
* Copyright 2016 The Simple File Server 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
*
* 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.sfs.validate;
import com.google.common.io.BaseEncoding;
import io.vertx.core.MultiMap;
import io.vertx.core.json.JsonObject;
import org.sfs.SfsRequest;
import org.sfs.util.HttpRequestValidationException;
import rx.functions.Func1;
import static com.google.common.io.BaseEncoding.base64;
import static java.lang.String.format;
import static java.net.HttpURLConnection.HTTP_BAD_REQUEST;
public class ValidateParamIsBase64Encoded implements Func1<SfsRequest, SfsRequest> {
private final String paramName;
public ValidateParamIsBase64Encoded(String paramName) {
this.paramName = paramName;
}
@Override
public SfsRequest call(SfsRequest httpServerRequest) {
MultiMap params = httpServerRequest.params();
String value = params.get(paramName);
if (value != null) {
boolean failed = false;
BaseEncoding baseEncoding = base64();
try {
byte[] decoded = baseEncoding.decode(value);
if (decoded == null || value.equals(baseEncoding.encode(decoded))) {
failed = true;
}
} catch (Throwable e) {
// do nothing
}
if (failed) {
JsonObject jsonObject = new JsonObject()
.put("message", format("%s must be Base64 encoded", paramName));
throw new HttpRequestValidationException(HTTP_BAD_REQUEST, jsonObject);
}
}
return httpServerRequest;
}
}