Implement CEL filter in list folder command

folder/filter.go

@@ -0,0 +1,64 @@
+package folder
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/google/cel-go/cel"
+	"github.com/passbolt/go-passbolt/api"
+)
+
+// Environments for CEl
+var celEnvOptions = []cel.EnvOption{
+	cel.Variable("ID", cel.StringType),
+	cel.Variable("FolderParentID", cel.StringType),
+	cel.Variable("Name", cel.StringType),
+	cel.Variable("CreatedTimestamp", cel.TimestampType),
+	cel.Variable("ModifiedTimestamp", cel.TimestampType),
+}
+
+func filterFolders(folders *[]api.Folder, celCmd string, ctx context.Context) ([]api.Folder, error) {
+	if celCmd == "" {
+		return *folders, nil
+	}
+
+	env, err := cel.NewEnv(celEnvOptions...)
+	if err != nil {
+		return nil, err
+	}
+
+	ast, issue := env.Compile(celCmd)
+	if issue.Err() != nil {
+		return nil, issue.Err()
+	}
+
+	program, err := env.Program(ast)
+	if err != nil {
+		return nil, err
+	}
+
+	filteredFolders := []api.Folder{}
+	for _, folder := range *folders {
+		val, _, err := program.ContextEval(ctx, map[string]any{
+			"ID":                folder.ID,
+			"FolderParentID":    folder.FolderParentID,
+			"Name":              folder.Name,
+			"CreatedTimestamp":  folder.Created.Time,
+			"ModifiedTimestamp": folder.Modified.Time,
+		})
+
+		if err != nil {
+			return nil, err
+		}
+
+		if val.Value() == true {
+			filteredFolders = append(filteredFolders, folder)
+		}
+	}
+
+	if len(filteredFolders) == 0 {
+		return nil, fmt.Errorf("No such folders found with filter %v!", celCmd)
+	}
+
+	return filteredFolders, nil
+}