Use go-chi instead of gorilla as a router

gorilla is no longer maintained:
    gorilla/mux#659

this means we shouldn't probably be using it. I chose go-chi as the
replacement because the handler structure is very similar (unlike gin)
and since our routing needs are very basic, we wouldn't need much of
gin's complexity. go-chi is also quite lightweight.

Signed-off-by: Jakub Hrozek <[email protected]>

go.mod

@@ -5,9 +5,9 @@ go 1.19
 require (
 	github.com/cenkalti/backoff/v4 v4.2.1
 	github.com/fsnotify/fsnotify v1.6.0
+	github.com/go-chi/chi/v5 v5.0.8
 	github.com/go-logr/logr v1.2.4
 	github.com/go-logr/zapr v1.2.4
-	github.com/gorilla/mux v1.8.0
 	github.com/mitchellh/go-homedir v1.1.0
 	github.com/olekukonko/tablewriter v0.0.5
 	github.com/onsi/ginkgo/v2 v2.10.0

go.sum

@@ -63,6 +63,8 @@ github.com/envoyproxy/protoc-gen-validate v0.1.0/go.mod h1:iSmxcyjqTsJpI2R4NaDN7
 github.com/frankban/quicktest v1.14.4 h1:g2rn0vABPOOXmZUj+vbmUp0lPoXEMuhTpIluN0XL9UY=
 github.com/fsnotify/fsnotify v1.6.0 h1:n+5WquG0fcWoWp6xPWfHdbskMCQaFnG6PfBrh1Ky4HY=
 github.com/fsnotify/fsnotify v1.6.0/go.mod h1:sl3t1tCWJFWoRz9R8WJCbQihKKwmorjAbSClcnxKAGw=
+github.com/go-chi/chi/v5 v5.0.8 h1:lD+NLqFcAi1ovnVZpsnObHGW4xb4J8lNmoYVfECH1Y0=
+github.com/go-chi/chi/v5 v5.0.8/go.mod h1:DslCQbL2OYiznFReuXYUmQ2hGd1aDpCnlMNITLSKoi8=
 github.com/go-gl/glfw v0.0.0-20190409004039-e6da0acd62b1/go.mod h1:vR7hzQXu2zJy9AVAgeJqvqgH9Q5CA+iKCZ2gyEVpxRU=
 github.com/go-gl/glfw/v3.3/glfw v0.0.0-20191125211704-12ad95a8df72/go.mod h1:tQ2UAYgL5IevRw8kRxooKSPJfGvJ9fJQFa0TUsXzTg8=
 github.com/go-gl/glfw/v3.3/glfw v0.0.0-20200222043503-6f7a984d4dc4/go.mod h1:tQ2UAYgL5IevRw8kRxooKSPJfGvJ9fJQFa0TUsXzTg8=
@@ -131,8 +133,6 @@ github.com/google/uuid v1.1.2/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+
 github.com/googleapis/gax-go/v2 v2.0.4/go.mod h1:0Wqv26UfaUD9n4G6kQubkQ+KchISgw+vpHVxEJEs9eg=
 github.com/googleapis/gax-go/v2 v2.0.5/go.mod h1:DWXyrwAJ9X0FpwwEdw+IPEYBICEFu5mhpdKc/us6bOk=
 github.com/googleapis/google-cloud-go-testing v0.0.0-20200911160855-bcd43fbb19e8/go.mod h1:dvDLG8qkwmyD9a/MJJN3XJcT3xFxOKAvTZGvuZmac9g=
-github.com/gorilla/mux v1.8.0 h1:i40aqfkR1h2SlN9hojwV5ZA91wcXFOvkdNIeFDP5koI=
-github.com/gorilla/mux v1.8.0/go.mod h1:DVbg23sWSpFRCP0SfiEN6jmj59UnW/n46BH5rLB71So=
 github.com/hashicorp/golang-lru v0.5.0/go.mod h1:/m3WP610KZHVQ1SGc6re/UDhFvYD7pJ4Ao+sR/qLZy8=
 github.com/hashicorp/golang-lru v0.5.1/go.mod h1:/m3WP610KZHVQ1SGc6re/UDhFvYD7pJ4Ao+sR/qLZy8=
 github.com/hashicorp/hcl v1.0.0 h1:0Anlzjpi4vEasTeNFn2mLJgTSwt0+6sfsiTG8qcWGx4=

pkg/daemon/status_server.go

@@ -11,8 +11,8 @@ import (
 	"time"
 
 	"github.com/containers/selinuxd/pkg/datastore"
+	"github.com/go-chi/chi/v5"
 	"github.com/go-logr/logr"
-	"github.com/gorilla/mux"
 )
 
 const (
@@ -53,7 +53,7 @@ func initStatusServer(cfg StatusServerConfig, ds datastore.ReadOnlyDataStore, l
 }
 
 func (ss *statusServer) Serve(readychan <-chan bool) error {
-	r := mux.NewRouter()
+	r := chi.NewRouter()
 	ss.initializeRoutes(r)
 
 	server := &http.Server{
@@ -75,25 +75,16 @@ func (ss *statusServer) waitForReady(readychan <-chan bool) {
 	ss.l.Info("Status Server got READY signal")
 }
 
-func (ss *statusServer) initializeRoutes(r *mux.Router) {
+func (ss *statusServer) initializeRoutes(r chi.Router) {
 	// /policies/
-	s := r.PathPrefix("/policies").Subrouter()
-	s.HandleFunc("/", ss.listPoliciesHandler).
-		Methods("GET")
-	s.HandleFunc("/", ss.catchAllNotGetHandler)
-	// IMPORTANT(jaosorior): We should better restrict what characters
-	// does this handler accept
-	s.HandleFunc("/{policy}", ss.getPolicyStatusHandler).
-		Methods("GET")
-	s.HandleFunc("/{policy}", ss.catchAllNotGetHandler)
-
-	// /policies -- without the trailing /
-	r.HandleFunc("/policies", ss.listPoliciesHandler).
-		Methods("GET")
-	r.HandleFunc("/policies", ss.catchAllNotGetHandler)
-	r.HandleFunc("/ready", ss.readyStatusHandler)
-	r.HandleFunc("/ready/", ss.readyStatusHandler)
-	r.HandleFunc("/", ss.catchAllHandler)
+	r.Route("/policies", func(r chi.Router) {
+		r.Get("/", ss.listPoliciesHandler)
+		r.Get("/{policy}", ss.getPolicyStatusHandler)
+	})
+
+	r.Get("/ready", ss.readyStatusHandler)
+	r.Get("/ready/", ss.readyStatusHandler)
+	r.Get("/", ss.catchAllHandler)
 
 	if ss.cfg.EnableProfiling {
 		r.HandleFunc("/debug/pprof/", pprof.Index)
@@ -125,8 +116,7 @@ func (ss *statusServer) listPoliciesHandler(w http.ResponseWriter, r *http.Reque
 }
 
 func (ss *statusServer) getPolicyStatusHandler(w http.ResponseWriter, r *http.Request) {
-	vars := mux.Vars(r)
-	policy := vars["policy"]
+	policy := chi.URLParam(r, "policy")
 	status, err := ss.ds.Get(policy)
 	if errors.Is(err, datastore.ErrPolicyNotFound) {
 		http.Error(w, "couldn't find requested policy", http.StatusNotFound)
@@ -159,10 +149,6 @@ func (ss *statusServer) catchAllHandler(w http.ResponseWriter, r *http.Request)
 	http.Error(w, "Invalid path", http.StatusBadRequest)
 }
 
-func (ss *statusServer) catchAllNotGetHandler(w http.ResponseWriter, r *http.Request) {
-	http.Error(w, "Only GET is allowed", http.StatusBadRequest)
-}
-
 func createSocket(path string, uid, gid int) (net.Listener, error) {
 	if err := os.RemoveAll(path); err != nil {
 		return nil, fmt.Errorf("cannot remove old socket: %w", err)