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Dynatrace OpenKit - Java Reference Implementation
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/**
 * Copyright 2018-2021 Dynatrace LLC
 *
 * 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.dynatrace.openkit.api;

import java.net.URL;
import java.util.jar.Attributes;
import java.util.jar.Manifest;

/**
 * Defines constant values used in OpenKit
 */
public class OpenKitConstants {


    /**
     * Explicit default constructor to hide implicit public one.
     */
    private OpenKitConstants() {
        throw new IllegalStateException("constants class");
    }

    /**
     * Name of Dynatrace HTTP header which is used for tracing web requests.
     */
    public static final String WEBREQUEST_TAG_HEADER = "X-dynaTrace";

    // default values used in configuration
    public static final String DEFAULT_APPLICATION_VERSION;
    public static final String DEFAULT_OPERATING_SYSTEM;
    public static final String DEFAULT_MANUFACTURER;
    public static final String DEFAULT_MODEL_ID = "OpenKitDevice";

    // load default version and vendor information from MANIFEST.MF
    static {

        String specificationVersion = "";
        String implementationVersion = "";
        String implementationVendor = "Dynatrace";

        try {
            Class clazz = OpenKitConstants.class;
            String className = clazz.getSimpleName() + ".class";
            String classPath = clazz.getResource(className).toString();
            if (classPath.startsWith("jar")) {
                String manifestPath = classPath.substring(0, classPath.lastIndexOf("!") + 1) + "/META-INF/MANIFEST.MF";
                Manifest manifest = new Manifest(new URL(manifestPath).openStream());
                Attributes attr = manifest.getMainAttributes();

                specificationVersion = attr.getValue("Specification-Version");
                implementationVersion = attr.getValue("Implementation-Version");
                implementationVendor = attr.getValue("Implementation-Vendor");
            }
        } catch (Exception e) {
            // intentionally left empty
        }

        if (implementationVersion != null && !implementationVersion.trim().isEmpty()) {
            DEFAULT_APPLICATION_VERSION = specificationVersion + "-" + implementationVersion;
        } else {
            DEFAULT_APPLICATION_VERSION = specificationVersion;
        }
        DEFAULT_OPERATING_SYSTEM = "OpenKit " + DEFAULT_APPLICATION_VERSION;
        DEFAULT_MANUFACTURER = implementationVendor;
    }
}