From 11fde62b8c4e61c3d037df985486d70ec12d9bc6 Mon Sep 17 00:00:00 2001
From: Kristoffer Dalby <kristoffer@dalby.cc>
Date: Fri, 19 Jul 2024 09:04:04 +0200
Subject: [PATCH] remove custom contains funcs for slices.Contains (#2015)

Signed-off-by: Kristoffer Dalby <kristoffer@tailscale.com>
---
 cmd/headscale/cli/nodes.go |  5 +++--
 cmd/headscale/cli/utils.go | 11 -----------
 hscontrol/oidc.go          |  7 ++++---
 hscontrol/util/string.go   | 10 ----------
 4 files changed, 7 insertions(+), 26 deletions(-)

diff --git a/cmd/headscale/cli/nodes.go b/cmd/headscale/cli/nodes.go
index 58890cb0..4de7b969 100644
--- a/cmd/headscale/cli/nodes.go
+++ b/cmd/headscale/cli/nodes.go
@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"log"
 	"net/netip"
+	"slices"
 	"strconv"
 	"strings"
 	"time"
@@ -617,14 +618,14 @@ func nodesToPtables(
 		forcedTags = strings.TrimLeft(forcedTags, ",")
 		var invalidTags string
 		for _, tag := range node.GetInvalidTags() {
-			if !contains(node.GetForcedTags(), tag) {
+			if !slices.Contains(node.GetForcedTags(), tag) {
 				invalidTags += "," + pterm.LightRed(tag)
 			}
 		}
 		invalidTags = strings.TrimLeft(invalidTags, ",")
 		var validTags string
 		for _, tag := range node.GetValidTags() {
-			if !contains(node.GetForcedTags(), tag) {
+			if !slices.Contains(node.GetForcedTags(), tag) {
 				validTags += "," + pterm.LightGreen(tag)
 			}
 		}
diff --git a/cmd/headscale/cli/utils.go b/cmd/headscale/cli/utils.go
index 8a91c5c6..e4fef807 100644
--- a/cmd/headscale/cli/utils.go
+++ b/cmd/headscale/cli/utils.go
@@ -6,7 +6,6 @@ import (
 	"encoding/json"
 	"fmt"
 	"os"
-	"reflect"
 
 	"github.com/rs/zerolog/log"
 	"google.golang.org/grpc"
@@ -197,13 +196,3 @@ func (t tokenAuth) GetRequestMetadata(
 func (tokenAuth) RequireTransportSecurity() bool {
 	return true
 }
-
-func contains[T string](ts []T, t T) bool {
-	for _, v := range ts {
-		if reflect.DeepEqual(v, t) {
-			return true
-		}
-	}
-
-	return false
-}
diff --git a/hscontrol/oidc.go b/hscontrol/oidc.go
index b728a6d0..bb836a06 100644
--- a/hscontrol/oidc.go
+++ b/hscontrol/oidc.go
@@ -10,6 +10,7 @@ import (
 	"fmt"
 	"html/template"
 	"net/http"
+	"slices"
 	"strings"
 	"time"
 
@@ -365,7 +366,7 @@ func validateOIDCAllowedDomains(
 ) error {
 	if len(allowedDomains) > 0 {
 		if at := strings.LastIndex(claims.Email, "@"); at < 0 ||
-			!util.IsStringInSlice(allowedDomains, claims.Email[at+1:]) {
+			!slices.Contains(allowedDomains, claims.Email[at+1:]) {
 			log.Trace().Msg("authenticated principal does not match any allowed domain")
 
 			writer.Header().Set("Content-Type", "text/plain; charset=utf-8")
@@ -393,7 +394,7 @@ func validateOIDCAllowedGroups(
 ) error {
 	if len(allowedGroups) > 0 {
 		for _, group := range allowedGroups {
-			if util.IsStringInSlice(claims.Groups, group) {
+			if slices.Contains(claims.Groups, group) {
 				return nil
 			}
 		}
@@ -420,7 +421,7 @@ func validateOIDCAllowedUsers(
 	claims *IDTokenClaims,
 ) error {
 	if len(allowedUsers) > 0 &&
-		!util.IsStringInSlice(allowedUsers, claims.Email) {
+		!slices.Contains(allowedUsers, claims.Email) {
 		log.Trace().Msg("authenticated principal does not match any allowed user")
 		writer.Header().Set("Content-Type", "text/plain; charset=utf-8")
 		writer.WriteHeader(http.StatusBadRequest)
diff --git a/hscontrol/util/string.go b/hscontrol/util/string.go
index 6f018aff..ce38b82e 100644
--- a/hscontrol/util/string.go
+++ b/hscontrol/util/string.go
@@ -56,16 +56,6 @@ func GenerateRandomStringDNSSafe(size int) (string, error) {
 	return str[:size], nil
 }
 
-func IsStringInSlice(slice []string, str string) bool {
-	for _, s := range slice {
-		if s == str {
-			return true
-		}
-	}
-
-	return false
-}
-
 func TailNodesToString(nodes []*tailcfg.Node) string {
 	temp := make([]string, len(nodes))