com.google.api.control.aggregator.Signing.java Source code

Introduction

Here is the source code for com.google.api.control.aggregator.Signing.java

Source

/*
 * Copyright 2016 Google Inc. All Rights Reserved.
 *
 * 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.google.api.control.aggregator;

import com.google.common.hash.Hasher;

import java.nio.charset.StandardCharsets;
import java.util.Map;

/**
 * Provides functions that support the creation of signatures.
 */
public final class Signing {
    private Signing() {
    }

    /**
     * Updates {@code h} with the contents of {@code labels}.
     *
     * {@code labels} can be any Map<String, String>, but intended to be used for the labels of
     * one of the model protobufs.
     *
     * @param h a {@link Hasher}
     * @param labels some labels
     * @return the {@code Hasher}, to allow fluent-style usage
     */
    public static Hasher putLabels(Hasher h, Map<String, String> labels) {
        for (Map.Entry<String, String> labelsEntry : labels.entrySet()) {
            h.putChar('\0');
            h.putString(labelsEntry.getKey(), StandardCharsets.UTF_8);
            h.putChar('\0');
            h.putString(labelsEntry.getValue(), StandardCharsets.UTF_8);
        }
        return h;
    }
}