chore: use community maintained golang-jwt

The dgrijalva/jwt-go project is no longer maintained[1] and they have
transferred ownership to golang-jwt/jwt[2][3][4]. We should move to the
supported golang-jwt/jwt.

The following was performed:

1. update services/httpd/handler*.go to import golang-jwt/jwt
2. revert testcase string comparison changes from 225bcec (back to v3)
2. go mod edit -require github.com/golang-jwt/jwt@v3.2.1+incompatible
3. go mod edit -droprequire github.com/dgrijalva/jwt-go
4. go mod tidy
5. go clean ./... && go build ./...
6. go test ./...

References:
[1] dgrijalva/jwt-go#462
[2] dgrijalva/jwt-go#463
[3] https://github.com/dgrijalva/jwt-go/blob/master/README.md
[4] https://github.com/golang-jwt/jwt
[5] influxdata#21926

DEPENDENCIES.md

@@ -9,11 +9,11 @@
 - github.com/cespare/xxhash [MIT LICENSE](https://github.com/cespare/xxhash/blob/master/LICENSE.txt)
 - github.com/clarkduvall/hyperloglog [MIT LICENSE](https://github.com/clarkduvall/hyperloglog/blob/master/LICENSE)
 - github.com/davecgh/go-spew/spew [ISC LICENSE](https://github.com/davecgh/go-spew/blob/master/LICENSE)
-- github.com/dgrijalva/jwt-go [MIT LICENSE](https://github.com/dgrijalva/jwt-go/blob/master/LICENSE)
 - github.com/dgryski/go-bits [MIT LICENSE](https://github.com/dgryski/go-bits/blob/master/LICENSE)
 - github.com/dgryski/go-bitstream [MIT LICENSE](https://github.com/dgryski/go-bitstream/blob/master/LICENSE)
 - github.com/glycerine/go-unsnap-stream [MIT LICENSE](https://github.com/glycerine/go-unsnap-stream/blob/master/LICENSE)
 - github.com/gogo/protobuf/proto [BSD LICENSE](https://github.com/gogo/protobuf/blob/master/LICENSE)
+- github.com/golang-jwt/jwt [MIT LICENSE](https://github.com/golang-jwt/jwt/blob/master/LICENSE)
 - github.com/golang/protobuf [BSD LICENSE](https://github.com/golang/protobuf/blob/master/LICENSE)
 - github.com/golang/snappy [BSD LICENSE](https://github.com/golang/snappy/blob/master/LICENSE)
 - github.com/google/go-cmp [BSD LICENSE](https://github.com/google/go-cmp/blob/master/LICENSE)

go.mod

@@ -10,9 +10,9 @@ require (
 	github.com/boltdb/bolt v1.3.1
 	github.com/cespare/xxhash v1.1.0
 	github.com/davecgh/go-spew v1.1.1
-	github.com/dgrijalva/jwt-go/v4 v4.0.0-preview1
 	github.com/dgryski/go-bitstream v0.0.0-20180413035011-3522498ce2c8
 	github.com/gogo/protobuf v1.3.1
+	github.com/golang-jwt/jwt v3.2.1+incompatible
 	github.com/golang/snappy v0.0.1
 	github.com/google/go-cmp v0.5.0
 	github.com/influxdata/flux v0.65.0

go.sum

@@ -131,10 +131,7 @@ github.com/dave/jennifer v1.2.0/go.mod h1:fIb+770HOpJ2fmN9EPPKOqm1vMGhB+TwXKMZhr
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/dgrijalva/jwt-go v3.2.0+incompatible h1:7qlOGliEKZXTDg6OTjfoBKDXWrumCAMpl/TFQ4/5kLM=
 github.com/dgrijalva/jwt-go v3.2.0+incompatible/go.mod h1:E3ru+11k8xSBh+hMPgOLZmtrrCbhqsmaPHjLKYnJCaQ=
-github.com/dgrijalva/jwt-go/v4 v4.0.0-preview1 h1:CaO/zOnF8VvUfEbhRatPcwKVWamvbYd8tQGRWacE9kU=
-github.com/dgrijalva/jwt-go/v4 v4.0.0-preview1/go.mod h1:+hnT3ywWDTAFrW5aE+u2Sa/wT555ZqwoCS+pk3p6ry4=
 github.com/dgryski/go-bitstream v0.0.0-20180413035011-3522498ce2c8 h1:akOQj8IVgoeFfBTzGOEQakCYshWD6RNo1M5pivFXt70=
 github.com/dgryski/go-bitstream v0.0.0-20180413035011-3522498ce2c8/go.mod h1:VMaSuZ+SZcx/wljOQKvp5srsbCiKDEb6K2wC4+PiBmQ=
 github.com/dgryski/go-sip13 v0.0.0-20190329191031-25c5027a8c7b/go.mod h1:vAd38F8PWV+bWy6jNmig1y/TA+kYO4g3RSRF0IAv0no=
@@ -276,6 +273,8 @@ github.com/gogo/protobuf v1.2.2-0.20190723190241-65acae22fc9d/go.mod h1:SlYgWuQ5
 github.com/gogo/protobuf v1.2.2-0.20190730201129-28a6bbf47e48/go.mod h1:SlYgWuQ5SjCEi6WLHjHCa1yvBfUnHcTbrrZtXPKa29o=
 github.com/gogo/protobuf v1.3.1 h1:DqDEcV5aeaTmdFBePNpYsp3FlcVH/2ISVVM9Qf8PSls=
 github.com/gogo/protobuf v1.3.1/go.mod h1:SlYgWuQ5SjCEi6WLHjHCa1yvBfUnHcTbrrZtXPKa29o=
+github.com/golang-jwt/jwt v3.2.1+incompatible h1:73Z+4BJcrTC+KczS6WvTPvRGOp1WmfEP4Q1lOd9Z/+c=
+github.com/golang-jwt/jwt v3.2.1+incompatible/go.mod h1:8pz2t5EyA70fFQQSrl6XZXzqecmYZeUEB8OUGHkxJ+I=
 github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0/go.mod h1:E/TSTwGwJL78qG/PmXZO1EjYhfJinVAhrmmHX6Z8B9k=
 github.com/golang/geo v0.0.0-20190916061304-5b978397cfec h1:lJwO/92dFXWeXOZdoGXgptLmNLwynMSHUmU6besqtiw=
 github.com/golang/geo v0.0.0-20190916061304-5b978397cfec/go.mod h1:QZ0nwyI2jOfgRAoBvP+ab5aRr7c9x7lhGEJrKvBwjWI=

services/httpd/handler.go

@@ -23,8 +23,8 @@ import (
 	httppprof "net/http/pprof"
 
 	"github.com/bmizerany/pat"
-	"github.com/dgrijalva/jwt-go/v4"
 	"github.com/gogo/protobuf/proto"
+	"github.com/golang-jwt/jwt"
 	"github.com/golang/snappy"
 	"github.com/influxdata/flux"
 	"github.com/influxdata/flux/lang"

services/httpd/handler_test.go

@@ -21,8 +21,8 @@ import (
 	"testing"
 	"time"
 
-	"github.com/dgrijalva/jwt-go/v4"
 	"github.com/gogo/protobuf/proto"
+	"github.com/golang-jwt/jwt"
 	"github.com/golang/snappy"
 	"github.com/google/go-cmp/cmp"
 	"github.com/influxdata/flux"
@@ -196,7 +196,7 @@ func TestHandler_Query_Auth(t *testing.T) {
 	h.ServeHTTP(w, req)
 	if w.Code != http.StatusUnauthorized {
 		t.Fatalf("unexpected status: %d: %s", w.Code, w.Body.String())
-	} else if body := strings.TrimSpace(w.Body.String()); body != `{"error":"token signature is invalid"}` {
+	} else if body := strings.TrimSpace(w.Body.String()); body != `{"error":"signature is invalid"}` {
 		t.Fatalf("unexpected body: %s", body)
 	}
 
@@ -220,7 +220,7 @@ func TestHandler_Query_Auth(t *testing.T) {
 	h.ServeHTTP(w, req)
 	if w.Code != http.StatusUnauthorized {
 		t.Fatalf("unexpected status: %d: %s", w.Code, w.Body.String())
-	} else if !strings.Contains(w.Body.String(), `{"error":"token is expired`) {
+	} else if !strings.Contains(w.Body.String(), `{"error":"Token is expired`) {
 		t.Fatalf("unexpected body: %s", w.Body.String())
 	}