add license checker

.travis.yml

@@ -8,5 +8,8 @@ script:
   - mvn clean package -f test_hessian/pom.xml
   - mvn clean package -f test_dubbo/pom.xml
   - go fmt && [[ -z `git status -s` ]]
+  - sh before_validate_license.sh
+  - chmod u+x /tmp/tools/license/license-header-checker
+  - /tmp/tools/license/license-header-checker -v -a -r -i vendor  /tmp/tools/license/license.txt . go  && [[ -z `git status -s` ]]
   - GO111MODULE=on && go mod vendor && go test -race && go test -bench . -race
 

before_validate_license.sh

@@ -0,0 +1,26 @@
+#
+#  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.
+
+remoteLicenseCheckerPath="https://github.com/dubbogo/resources/raw/master/tools/license"
+remoteLicenseCheckerName="license-header-checker"
+remoteLicenseCheckerURL="${remoteLicenseCheckerPath}/${remoteLicenseCheckerName}"
+remoteLicenseName="license.txt"
+remoteLicenseURL="${remoteLicenseCheckerPath}/${remoteLicenseName}"
+
+licensePath="/tmp/tools/license"
+mkdir -p ${licensePath}
+wget -P "${licensePath}" ${remoteLicenseCheckerURL}
+wget -P "${licensePath}" ${remoteLicenseURL}