Refactor server to separate handlers

Signed-off-by: Jonathon Anderson <janderson@ciq.com>

internal/pkg/warewulfd/efi.go

@@ -0,0 +1,60 @@
+package warewulfd
+
+import (
+	"fmt"
+	"net/http"
+	"path"
+
+	"github.com/warewulf/warewulf/internal/pkg/image"
+	"github.com/warewulf/warewulf/internal/pkg/wwlog"
+)
+
+// HandleEfiBoot handles EFI boot file requests (shim, grub, grub.cfg)
+func HandleEfiBoot(w http.ResponseWriter, req *http.Request) {
+	ctx, err := initHandleRequest(w, req)
+	if err != nil {
+		return // response already written
+	}
+
+	if !ctx.remoteNode.Valid() {
+		wwlog.Error("%s (unknown/unconfigured node)", ctx.rinfo.hwaddr)
+		sendResponse(w, req, "", nil, ctx)
+		return
+	}
+
+	wwlog.Debug("requested method: %s", req.Method)
+	imageName := ctx.remoteNode.ImageName
+	var stageFile string
+	var tmplData *templateVars
+
+	switch ctx.rinfo.efifile {
+	case "shim.efi":
+		stageFile = image.ShimFind(imageName)
+		if stageFile == "" {
+			wwlog.Error("couldn't find shim.efi for %s", imageName)
+			w.WriteHeader(http.StatusNotFound)
+			return
+		}
+	case "grub.efi", "grub-tpm.efi", "grubx64.efi", "grubia32.efi", "grubaa64.efi", "grubarm.efi":
+		stageFile = image.GrubFind(imageName)
+		if stageFile == "" {
+			wwlog.Error("could't find grub*.efi for %s", imageName)
+			w.WriteHeader(http.StatusNotFound)
+			return
+		}
+	case "grub.cfg":
+		stageFile = path.Join(ctx.conf.Paths.Sysconfdir, "warewulf/grub/grub.cfg.ww")
+		tmplData = buildTemplateVars(ctx.conf, ctx.rinfo, ctx.remoteNode)
+		if stageFile == "" {
+			wwlog.Error("could't find grub.cfg template for %s", imageName)
+			w.WriteHeader(http.StatusNotFound)
+			return
+		}
+	default:
+		wwlog.ErrorExc(fmt.Errorf("could't find efiboot file: %s", ctx.rinfo.efifile), "")
+		w.WriteHeader(http.StatusNotFound)
+		return
+	}
+
+	sendResponse(w, req, stageFile, tmplData, ctx)
+}