| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 |
| * |
| * https://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.apache.avro.tool; |
| |
| import java.io.InputStream; |
| import java.io.IOException; |
| import java.io.PrintStream; |
| |
| import java.util.List; |
| |
| import joptsimple.OptionParser; |
| import joptsimple.OptionSet; |
| import joptsimple.OptionSpec; |
| |
| import org.apache.avro.Schema; |
| import org.apache.avro.SchemaNormalization; |
| |
| /** |
| * Utility to generate fingerprint(s) from a schema. |
| */ |
| public class SchemaFingerprintTool implements Tool { |
| |
| @Override |
| public int run(InputStream in, PrintStream out, PrintStream err, List<String> args) throws Exception { |
| final OptionParser optParser = new OptionParser(); |
| final OptionSpec<String> fingerprintOpt = optParser |
| .accepts("fingerprint", |
| "Fingerprint algorithm to use. Recommended Avro practice dictiates " |
| + "that \"CRC-64-AVRO\" is used for 64-bit fingerprints, \"MD5\" is " |
| + "used for 128-bit fingerprints, and \"SHA-256\" is used for 256-bit " + "fingerprints.") |
| .withRequiredArg().ofType(String.class).defaultsTo("CRC-64-AVRO"); |
| |
| final OptionSet opts = optParser.parse(args.toArray(new String[0])); |
| final Schema.Parser parser = new Schema.Parser(); |
| final List<String> nargs = (List<String>) opts.nonOptionArguments(); |
| if (nargs.size() < 1) { |
| printHelp(out, optParser); |
| return 0; |
| } |
| |
| for (final String fileOrStdin : (List<String>) opts.nonOptionArguments()) { |
| final InputStream input = Util.fileOrStdin(fileOrStdin, in); |
| try { |
| final Schema schema = parser.parse(input); |
| final byte[] fingerprint = SchemaNormalization.parsingFingerprint(opts.valueOf(fingerprintOpt), schema); |
| out.format("%s %s%n", Util.encodeHex(fingerprint), fileOrStdin); |
| } finally { |
| Util.close(input); |
| } |
| } |
| |
| return 0; |
| } |
| |
| @Override |
| public String getName() { |
| return "fingerprint"; |
| } |
| |
| @Override |
| public String getShortDescription() { |
| return "Returns the fingerprint for the schemas."; |
| } |
| |
| private void printHelp(PrintStream out, OptionParser optParser) throws IOException { |
| out.println("fingerprint [--fingerprint <fingerprint>] input-file [inputfile [inputfile...]]"); |
| out.println(); |
| out.println("generates fingerprints based on Avro specification."); |
| optParser.printHelpOn(out); |
| out.println("A dash ('-') can be given to read a schema from stdin"); |
| } |
| } |