Add Cloudflare email and collaboration workflows

apps/server/internal/collaboration/util.go

@@ -4,10 +4,27 @@ import (
 	"crypto/rand"
 	"crypto/sha256"
 	"encoding/hex"
+	"fmt"
+	"path"
 	"strings"
 	"time"
 )
 
+func NormalizeFolderPath(raw string) (string, error) {
+	raw = strings.TrimSpace(strings.ReplaceAll(raw, "\\", "/"))
+	if raw == "" || raw == "/" {
+		return "", nil
+	}
+	clean := path.Clean(strings.Trim(raw, "/"))
+	if clean == "." {
+		return "", nil
+	}
+	if clean == ".." || strings.HasPrefix(clean, "../") {
+		return "", fmt.Errorf("folder path must remain inside the content root")
+	}
+	return clean, nil
+}
+
 func randomID(prefix string) string {
 	buf := make([]byte, 12)
 	if _, err := rand.Read(buf); err != nil {