org.sfs.validate.ValidateHeaderBetweenInteger.java Source code

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Here is the source code for org.sfs.validate.ValidateHeaderBetweenInteger.java

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/*
 * 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 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.primitives.Ints.tryParse;
import static java.lang.String.format;
import static java.net.HttpURLConnection.HTTP_BAD_REQUEST;

public class ValidateHeaderBetweenInteger implements Func1<SfsRequest, SfsRequest> {

    private final String headerName;
    private final int min;
    private final int max;

    public ValidateHeaderBetweenInteger(String headerName, int min, int max) {
        this.headerName = headerName;
        this.min = min;
        this.max = max;
    }

    @Override
    public SfsRequest call(SfsRequest httpServerRequest) {
        MultiMap headers = httpServerRequest.headers();

        String value = headers.get(headerName);
        if (value != null) {
            Integer parsed = tryParse(value);
            if (parsed == null || parsed < min || parsed > max) {
                JsonObject jsonObject = new JsonObject().put("message",
                        format("%s must be between %d and %d", headerName, min, max));

                throw new HttpRequestValidationException(HTTP_BAD_REQUEST, jsonObject);
            }
        }
        return httpServerRequest;
    }
}