1 /* 2 * Copyright 2023 Google LLC 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions are 6 * met: 7 * 8 * * Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * * Redistributions in binary form must reproduce the above 11 * copyright notice, this list of conditions and the following disclaimer 12 * in the documentation and/or other materials provided with the 13 * distribution. 14 * 15 * * Neither the name of Google LLC nor the names of its 16 * contributors may be used to endorse or promote products derived from 17 * this software without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 20 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 21 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 22 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 23 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 24 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 25 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 29 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 package com.google.auth.oauth2; 33 34 import java.io.IOException; 35 import java.io.InputStream; 36 import java.util.Properties; 37 38 class MetricsUtils { 39 static final String API_CLIENT_HEADER = "x-goog-api-client"; 40 private static final String authLibraryVersion = getAuthLibraryVersion(); 41 private static final String javaLanguageVersion = System.getProperty("java.version"); 42 43 /** 44 * Gets the x-goog-api-client header value for the current Java language version and the auth 45 * library version. 46 * 47 * @return the header value. 48 */ getLanguageAndAuthLibraryVersions()49 static String getLanguageAndAuthLibraryVersions() { 50 return String.format("gl-java/%s auth/%s", javaLanguageVersion, authLibraryVersion); 51 } 52 getAuthLibraryVersion()53 private static String getAuthLibraryVersion() { 54 // Attempt to read the library's version from a properties file generated during the build. 55 // This value should be read and cached for later use. 56 String version = "unknown-version"; 57 try (InputStream inputStream = 58 MetricsUtils.class.getResourceAsStream( 59 "/com/google/auth/oauth2/google-auth-library.properties")) { 60 if (inputStream != null) { 61 final Properties properties = new Properties(); 62 properties.load(inputStream); 63 version = properties.getProperty("google-auth-library.version"); 64 } 65 } catch (IOException e) { 66 // Ignore. 67 } 68 return version; 69 } 70 } 71