Implement CEL filter in list user command

user/filter.go

@@ -0,0 +1,69 @@
+package user
+
+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("Username", cel.StringType),
+	cel.Variable("FirstName", cel.StringType),
+	cel.Variable("LastName", cel.StringType),
+	cel.Variable("Role", cel.StringType),
+	cel.Variable("CreatedTimestamp", cel.TimestampType),
+	cel.Variable("ModifiedTimestamp", cel.TimestampType),
+}
+
+// Filters the slice users by invoke CEL program for each user
+func filterUsers(users *[]api.User, celCmd string, ctx context.Context) ([]api.User, error) {
+	if celCmd == "" {
+		return *users, 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
+	}
+
+	filteredUsers := []api.User{}
+	for _, user := range *users {
+		val, _, err := program.ContextEval(ctx, map[string]any{
+			"ID":                user.ID,
+			"Username":          user.Username,
+			"FirstName":         user.Profile.FirstName,
+			"LastName":          user.Profile.LastName,
+			"Role":              user.Role.Name,
+			"CreatedTimestamp":  user.Created.Time,
+			"ModifiedTimestamp": user.Modified.Time,
+		})
+
+		if err != nil {
+			return nil, err
+		}
+
+		if val.Value() == true {
+			filteredUsers = append(filteredUsers, user)
+		}
+	}
+
+	if len(filteredUsers) == 0 {
+		return nil, fmt.Errorf("No such users found with filter %v!", celCmd)
+	}
+
+	return filteredUsers, nil
+}

user/list.go

@@ -62,6 +62,10 @@ func UserList(cmd *cobra.Command, args []string) error {
 	if err != nil {
 		return err
 	}
+	celFilter, err := cmd.Flags().GetString("filter")
+	if err != nil {
+		return err
+	}
 
 	ctx := util.GetContext()
 
@@ -82,6 +86,11 @@ func UserList(cmd *cobra.Command, args []string) error {
 		return fmt.Errorf("Listing User: %w", err)
 	}
 
+	users, err = filterUsers(&users, celFilter, ctx)
+	if err != nil {
+		return err
+	}
+
 	if jsonOutput {
 		outputUsers := []UserJsonOutput{}
 		for i := range users {