Refactor server routes

internal/server/routes/errors.go

@@ -0,0 +1,32 @@
+package routes
+
+import (
+	"log/slog"
+	"net/http"
+
+	"git.a71.su/Andrew71/hibiscus-txt/internal/templates"
+)
+
+// NotFound returns a user-friendly 404 error page.
+func NotFound(w http.ResponseWriter, r *http.Request) {
+	w.WriteHeader(404)
+
+	err := templates.Template404.Execute(w, nil)
+	if err != nil {
+		slog.Error("error rendering error 404 page", "error", err)
+		InternalError(w, r)
+		return
+	}
+}
+
+// InternalError returns a user-friendly 500 error page.
+func InternalError(w http.ResponseWriter, r *http.Request) {
+	w.WriteHeader(500)
+
+	err := templates.Template500.Execute(w, nil)
+	if err != nil { // Well this is awkward
+		slog.Error("error rendering error 500 page", "error", err)
+		http.Error(w, "500. Something went *very* wrong.", http.StatusInternalServerError)
+		return
+	}
+}