Use strings.Builder in Fingerprint

examples/server.go

@@ -7,6 +7,7 @@ import (
 	"crypto/tls"
 	"crypto/x509"
 	"encoding/pem"
+	"fmt"
 	"io"
 	"log"
 	"os"

fs.go

@@ -5,7 +5,6 @@ import (
 	"mime"
 	"os"
 	"path"
-	"path/filepath"
 )
 
 func init() {
@@ -25,14 +24,14 @@ type fsHandler struct {
 }
 
 func (fsh fsHandler) Respond(w *ResponseWriter, r *Request) {
-	path := path.Clean(r.URL.Path)
-	f, err := fsh.Open(path)
+	p := path.Clean(r.URL.Path)
+	f, err := fsh.Open(p)
 	if err != nil {
 		w.WriteStatus(StatusNotFound)
 		return
 	}
 	// Detect mimetype
-	ext := filepath.Ext(path)
+	ext := path.Ext(p)
 	mimetype := mime.TypeByExtension(ext)
 	w.SetMimetype(mimetype)
 	// Copy file to response writer
@@ -71,7 +70,7 @@ func ServeFile(w *ResponseWriter, fs FS, name string) {
 		return
 	}
 	// Detect mimetype
-	ext := filepath.Ext(name)
+	ext := path.Ext(name)
 	mimetype := mime.TypeByExtension(ext)
 	w.SetMimetype(mimetype)
 	// Copy file to response writer

tofu.go

@@ -2,7 +2,6 @@ package gemini
 
 import (
 	"bufio"
-	"bytes"
 	"crypto/sha512"
 	"crypto/x509"
 	"fmt"
@@ -162,14 +161,14 @@ func appendKnownHost(w io.Writer, hostname string, c certInfo) (int, error) {
 // Fingerprint returns the SHA-512 fingerprint of the provided certificate.
 func Fingerprint(cert *x509.Certificate) string {
 	sum512 := sha512.Sum512(cert.Raw)
-	var buf bytes.Buffer
+	var b strings.Builder
 	for i, f := range sum512 {
 		if i > 0 {
-			fmt.Fprintf(&buf, ":")
+			b.WriteByte(':')
 		}
-		fmt.Fprintf(&buf, "%02X", f)
+		fmt.Fprintf(&b, "%02X", f)
 	}
-	return buf.String()
+	return b.String()
 }
 
 // defaultKnownHostsPath returns the default known_hosts path.