Rework basic auth

internal/handlers/basicauth.go

@@ -1,17 +1,44 @@
 package handlers
 
-import "net/http"
+import (
+	"net/http"
+	"strings"
+)
 
+// basicAuth is a middleware that performs basic authentication.
 func (hs *Handlers) basicAuth(next http.Handler) http.Handler {
 	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-		username, password, ok := r.BasicAuth()
-		if !ok || username != hs.cfg.GetUsername() || password != hs.cfg.GetPassword() {
-			w.Header().Set("WWW-Authenticate", `Basic realm="restricted"`)
-			w.WriteHeader(http.StatusUnauthorized)
-			w.Write([]byte(http.StatusText(http.StatusUnauthorized)))
-			return
+		if r.Method != "OPTIONS" && needsAuth(r.URL.Path) {
+			if !hs.authenticate(r) {
+				hs.unauthorized(w)
+				return
+			}
 		}
 
 		next.ServeHTTP(w, r)
 	})
 }
+
+// needsAuth checks if the given path requires authentication.
+func needsAuth(path string) bool {
+	authenticatedPaths := []string{"/dav/", "/infuse/"}
+	for _, p := range authenticatedPaths {
+		if strings.HasPrefix(path, p) {
+			return true
+		}
+	}
+	return false
+}
+
+// authenticate performs the basic authentication check.
+func (hs *Handlers) authenticate(r *http.Request) bool {
+	username, password, ok := r.BasicAuth()
+	return ok && username == hs.cfg.GetUsername() && password == hs.cfg.GetPassword()
+}
+
+// unauthorized sends an unauthorized response.
+func (hs *Handlers) unauthorized(w http.ResponseWriter) {
+	w.Header().Set("WWW-Authenticate", `Basic realm="restricted"`)
+	w.WriteHeader(http.StatusUnauthorized)
+	w.Write([]byte(http.StatusText(http.StatusUnauthorized)))
+}