Update go version to 1.16

This includes a fix for our samesite cookie parsing. The behaviour
changed in 1.16 so that the default value now leaves it empty, so it's
equivalent to not setting it (as per spec)

.github/workflows/ci.yaml

@@ -20,10 +20,10 @@ jobs:
     - name: Check out code
       uses: actions/checkout@v2
 
-    - name: Set up Go 1.15
+    - name: Set up Go 1.16
       uses: actions/setup-go@v2
       with:
-        go-version: 1.15.x
+        go-version: 1.16.x
       id: go
 
     - name: Get dependencies

CHANGELOG.md

@@ -8,6 +8,7 @@
 
 ## Changes since v7.0.1
 
+- [#1054](https://github.com/oauth2-proxy/oauth2-proxy/pull/1054) Update to Go 1.16 (@JoelSpeed)
 - [#1052](https://github.com/oauth2-proxy/oauth2-proxy/pull/1052) Update golangci-lint to latest version (v1.36.0) (@JoelSpeed)
 - [#1043](https://github.com/oauth2-proxy/oauth2-proxy/pull/1043) Refactor Sign In Page rendering and capture all page rendering code in pagewriter package (@JoelSpeed)
 - [#1029](https://github.com/oauth2-proxy/oauth2-proxy/pull/1029) Refactor error page rendering and allow debug messages on error (@JoelSpeed)

Dockerfile

@@ -1,4 +1,4 @@
-FROM golang:1.15-buster AS builder
+FROM golang:1.16-buster AS builder
 ARG VERSION
 
 # Copy sources

Dockerfile.arm64

@@ -1,4 +1,4 @@
-FROM golang:1.15-buster AS builder
+FROM golang:1.16-buster AS builder
 ARG VERSION
 
 # Copy sources

Dockerfile.armv6

@@ -1,4 +1,4 @@
-FROM golang:1.15-buster AS builder
+FROM golang:1.16-buster AS builder
 ARG VERSION
 
 # Copy sources

go.mod

@@ -1,6 +1,6 @@
 module github.com/oauth2-proxy/oauth2-proxy/v7
 
-go 1.15
+go 1.16
 
 require (
 	github.com/Bose/minisentinel v0.0.0-20200130220412-917c5a9223bb

pkg/cookies/cookies.go

@@ -76,7 +76,7 @@ func ParseSameSite(v string) http.SameSite {
 	case "none":
 		return http.SameSiteNoneMode
 	case "":
-		return http.SameSiteDefaultMode
+		return 0
 	default:
 		panic(fmt.Sprintf("Invalid value for SameSite: %s", v))
 	}