moving a function and struct over to a common library, starting on lockfile for server

common/commonlib.go

@@ -0,0 +1,37 @@
+package common
+
+import (
+	"fmt"
+	"path/filepath"
+)
+
+// CheckFileTypes allows the server and client to do some basic validation on adding/removing file types to the toml file
+func CheckFileTypes(input string, inputType string, ignores FileTypes) error {
+	switch inputType {
+	case "file":
+		fileExt := filepath.Ext(input) // TODO more sanity checking on ext
+		for _, ignoredExt := range ignores.Exts {
+			if fileExt == ignoredExt {
+				return fmt.Errorf("file ext is on ignored list, cannot add file with file ext %s", fileExt)
+			}
+		}
+		for _, ignoredFile := range ignores.Files {
+			if input == ignoredFile {
+				return fmt.Errorf("file name is on ignored list, cannot add file with name %s", input)
+			}
+		}
+	case "folder":
+		for _, ignoredFolder := range ignores.Folders {
+			if input == ignoredFolder {
+				return fmt.Errorf("folder name is on the ignored list, cannot add folder with name %s", input)
+			}
+		}
+	case "wildcard":
+		for _, ignoredExt := range ignores.Exts {
+			if input == ignoredExt {
+				return fmt.Errorf("cannot add wildcard, since that ext is already added to the ignore config %s", input)
+			}
+		}
+	}
+	return nil
+}