add missing license headers in go files

addresses.go

@@ -1,16 +1,5 @@
 // Copyright 2015 Matthew Holt and The Caddy Authors
-//
-// 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.
+// SPDX-License-Identifier: Apache-2.0
 
 package tscaddy
 

app.go

@@ -1,3 +1,6 @@
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: Apache-2.0
+
 package tscaddy
 
 // app.go contains App and Node, which provide global configuration for registering Tailscale nodes.

app_test.go

@@ -1,3 +1,6 @@
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: Apache-2.0
+
 package tscaddy
 
 import (

auth.go

@@ -1,3 +1,6 @@
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: Apache-2.0
+
 package tscaddy
 
 // auth.go contains the TailscaleAuth module and supporting logic.

command.go

@@ -1,16 +1,6 @@
 // Copyright 2015 Matthew Holt and The Caddy Authors
-//
-// 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.
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: Apache-2.0
 
 package tscaddy
 

module.go

@@ -1,3 +1,6 @@
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: Apache-2.0
+
 // Package tscaddy provides a set of Caddy modules to integrate Tailscale into Caddy.
 package tscaddy
 

module_test.go

@@ -1,3 +1,6 @@
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: Apache-2.0
+
 package tscaddy
 
 import (

transport.go

@@ -1,3 +1,6 @@
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: Apache-2.0
+
 package tscaddy
 
 // transport.go contains the Transport module.