[FLINK-35077][cdc] Add license checking CI scripts

.github/workflows/flink_cdc.yml

@@ -85,6 +85,22 @@ env:
   flink-cdc-e2e-tests/flink-cdc-source-e2e-tests"
 
 jobs:
+  license_check:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out repository code
+        uses: actions/checkout@v4
+        with:
+          submodules: true
+      - name: Set up Ruby environment
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: '3.3'
+      - name: Compiling jar packages
+        run: mvn --no-snapshot-updates -B package -DskipTests
+      - name: Run license check
+        run: gem install rubyzip && ./tools/ci/license_check.rb
+
   compile_and_test:
     # Only run the CI pipeline for the flink-cdc-connectors repository
 #    if: github.repository == 'apache/flink-cdc-connectors'

tools/ci/license_check.rb

@@ -0,0 +1,135 @@
+#!/usr/bin/env ruby
+# frozen_string_literal: true
+
+# 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
+#
+#      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.
+
+require 'zip'
+
+# These maven modules don't need to be checked
+EXCLUDED_MODULES = %w[flink-cdc-dist flink-cdc-e2e-tests].freeze
+
+# Questionable license statements which shouldn't occur in packaged jar files
+QUESTIONABLE_STATEMENTS = [
+  'Binary Code License',
+  'Intel Simplified Software License',
+  'JSR 275',
+  'Microsoft Limited Public License',
+  'Amazon Software License',
+  # Java SDK for Satori RTM license
+  'as necessary for your use of Satori services',
+  'REDIS SOURCE AVAILABLE LICENSE',
+  'Booz Allen Public License',
+  'Confluent Community License Agreement Version 1.0',
+  # “Commons Clause” License Condition v1.0
+  'the License does not grant to you, the right to Sell the Software.',
+  'Sun Community Source License Version 3.0',
+  'GNU General Public License',
+  'GNU Affero General Public License',
+  'GNU Lesser General Public License',
+  'Q Public License',
+  'Sleepycat License',
+  'Server Side Public License',
+  'Code Project Open License',
+  # BSD 4-Clause
+  ' All advertising materials mentioning features or use of this software must display the following acknowledgement',
+  # Facebook Patent clause v1
+  'The license granted hereunder will terminate, automatically and without notice, for anyone that makes any claim',
+  # Facebook Patent clause v2
+  'The license granted hereunder will terminate, automatically and without notice, if you (or any of your subsidiaries, corporate affiliates or agents) initiate directly or indirectly, or take a direct financial interest in, any Patent Assertion: (i) against Facebook',
+  'Netscape Public License',
+  'SOLIPSISTIC ECLIPSE PUBLIC LICENSE',
+  # DON'T BE A DICK PUBLIC LICENSE
+  "Do whatever you like with the original work, just don't be a dick.",
+  # JSON License
+  'The Software shall be used for Good, not Evil.',
+  # can sometimes be found in "funny" licenses
+  'Don’t be evil',
+  # IBM's non-FOSS license
+  'International Program License Agreement',
+  # Oracle's non-FOSS license
+  'Oracle Free Use Terms and Conditions'
+].freeze
+
+# These file extensions are binary-formatted. No check needed.
+BINARY_FILE_EXTENSIONS = %w[.class .dylib .so .dll .gif .ico].freeze
+
+# These packages are licensed under "Weak Copyleft" licenses.
+# According to Apache official guidelines, such software could be
+# packaged in jar if appropriately labelled.
+# See https://www.apache.org/legal/resolved.html for more details.
+EXCEPTION_PACKAGES = [
+  'org/glassfish/jersey/', # dual-licensed under GPL 2 and EPL 2.0
+  'org.glassfish.jersey', # dual-licensed under GPL 2 and EPL 2.0
+  'org.glassfish.hk2', # dual-licensed under GPL 2 and EPL 2.0
+  'javax.ws.rs-api', # dual-licensed under GPL 2 and EPL 2.0
+  'jakarta.ws.rs' # dual-licensed under GPL 2 and EPL 2.0
+].freeze
+
+puts 'Start license check...'
+
+# Extract Flink CDC revision number from global pom.xml
+begin
+  REVISION_NUMBER = File.read('pom.xml').scan(%r{<revision>(.*)</revision>}).last[0]
+rescue NoMethodError
+  abort 'Could not extract Flink CDC revision number from pom.xml'
+end
+
+puts "Flink CDC version: '#{REVISION_NUMBER}'"
+
+# Traversing maven module in given path
+def traverse_module(path)
+  module_name = File.basename path
+  return if EXCLUDED_MODULES.include?(module_name)
+
+  jar_file = File.join path, 'target', "#{module_name}-#{REVISION_NUMBER}.jar"
+  check_jar_license jar_file if File.exist? jar_file
+
+  File.read(File.join(path, 'pom.xml')).scan(%r{<module>(.*)</module>}).map(&:first).each do |submodule|
+    traverse_module File.join(path, submodule.to_s) unless submodule.nil?
+  end
+end
+
+@tainted_records = []
+
+# Check license issues in given jar file
+def check_jar_license(jar_file)
+  puts "Checking jar file #{jar_file}"
+  Zip::File.open(jar_file) do |jar|
+    jar.filter { |e| e.ftype == :file }
+       .filter { |e| !File.basename(e.name).downcase.end_with?(*BINARY_FILE_EXTENSIONS) }
+       .filter { |e| !File.basename(e.name).downcase.start_with? 'license', 'dependencies' }
+       .filter { |e| EXCEPTION_PACKAGES.none? { |ex| e.name.include? ex } }
+       .map do |e|
+         content = e.get_input_stream.read.force_encoding('UTF-8')
+         next unless QUESTIONABLE_STATEMENTS.map { |stmt| content.include?(stmt) }.any?
+
+         @tainted_records.push({
+                                 jar_file: File.basename(jar_file),
+                                 suspicious_file: e.name
+                               })
+       end
+  end
+end
+
+traverse_module '.'
+
+unless @tainted_records.empty?
+  puts "\nError: packaged jar contains files with incompatible licenses:"
+  puts @tainted_records.map { |e| "  -> In #{e[:jar_file]}: #{e[:suspicious_file]}" }.join("\n")
+  abort 'See https://www.apache.org/legal/resolved.html for more details.'
+end
+
+puts 'License check passed.'