cleanup license headers and contributing docs

- switch to "project authors" style copyright.  Instead of an AUTHORS
  file (https://opensource.google/docs/releasing/authors/), I just list
  Google as a major copyright holder in the README.
- use SPDX style license headers in source files
- remove CLA requirement from contributing docs

Author: willnorris

README.md

@@ -380,5 +380,7 @@ to alter the precedence order by setting:
 
 ## License ##
 
-imageproxy is copyright Google, but is not an official Google product.  It is
-available under the [Apache 2.0 License](./LICENSE).
+imageproxy is copyright its respective authors. All of my personal work on
+imageproxy through 2020 (which accounts for the majority of the code) is
+copyright Google, my employer at the time.  It is available under the [Apache
+2.0 License](./LICENSE).

cache.go

@@ -1,16 +1,5 @@
-// Copyright 2013 Google LLC. All rights reserved.
-//
-// 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 2013 The imageproxy authors.
+// SPDX-License-Identifier: Apache-2.0
 
 package imageproxy
 

cache_test.go

@@ -1,16 +1,5 @@
-// Copyright 2013 Google LLC. All rights reserved.
-//
-// 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 2013 The imageproxy authors.
+// SPDX-License-Identifier: Apache-2.0
 
 package imageproxy
 

cmd/imageproxy-sign/main.go

@@ -1,3 +1,6 @@
+// Copyright 2013 The imageproxy authors.
+// SPDX-License-Identifier: Apache-2.0
+
 // The imageproxy-sign tool creates signature values for a provided URL and
 // signing key.
 package main

cmd/imageproxy-sign/main_test.go

@@ -1,3 +1,6 @@
+// Copyright 2013 The imageproxy authors.
+// SPDX-License-Identifier: Apache-2.0
+
 package main
 
 import (

cmd/imageproxy/main.go

@@ -1,16 +1,5 @@
-// Copyright 2013 Google LLC. All rights reserved.
-//
-// 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 2013 The imageproxy authors.
+// SPDX-License-Identifier: Apache-2.0
 
 // imageproxy starts an HTTP server that proxies requests for remote images.
 package main

data.go

@@ -1,16 +1,5 @@
-// Copyright 2013 Google LLC. All rights reserved.
-//
-// 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 2013 The imageproxy authors.
+// SPDX-License-Identifier: Apache-2.0
 
 package imageproxy
 

data_test.go

@@ -1,16 +1,5 @@
-// Copyright 2013 Google LLC. All rights reserved.
-//
-// 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 2013 The imageproxy authors.
+// SPDX-License-Identifier: Apache-2.0
 
 package imageproxy
 

docs/contributing.md

@@ -27,16 +27,3 @@ Go code should follow general best practices, such as using go fmt, go lint, and
 go vet (this is enforced by our continuous integration setup).  Tests should
 always be included where possible, especially for bug fixes in order to prevent
 regressions.
-
-## Contributor License Agreement
-
-Even though this is effectively a personal project of mine, it is still governed
-by Google's Contributor License Agreement because of my employment there.  You
-(or your employer) retain the copyright to your contribution; the CLA simply
-gives permission to use and redistribute your contributions as part of the
-project.  Head over to <https://cla.developers.google.com/> to see your current
-agreements on file or to sign a new one.
-
-You generally only need to submit a CLA once, so if you've already submitted one
-(even if it was for a different Google project), you probably don't need to do
-it again.

imageproxy.go

@@ -1,16 +1,5 @@
-// Copyright 2013 Google LLC. All rights reserved.
-//
-// 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 2013 The imageproxy authors.
+// SPDX-License-Identifier: Apache-2.0
 
 // Package imageproxy provides an image proxy server.  For typical use of
 // creating and using a Proxy, see cmd/imageproxy/main.go.