ComputeArguments takes a list of arguments, and matches it against the expected inputs. It also applies a set of interpolations if needed.
(name string, inputs []*v1.PolicyInput, args map[string]string, bindings map[string]string, logger *zerolog.Logger)
| 509 | |
| 510 | // ComputeArguments takes a list of arguments, and matches it against the expected inputs. It also applies a set of interpolations if needed. |
| 511 | func ComputeArguments(name string, inputs []*v1.PolicyInput, args map[string]string, bindings map[string]string, logger *zerolog.Logger) (map[string]string, error) { |
| 512 | result := make(map[string]string) |
| 513 | |
| 514 | // Policies without inputs in the spec |
| 515 | // TODO: Remove this in next release, once users have migrated their policies |
| 516 | if len(inputs) == 0 { |
| 517 | result = args |
| 518 | } |
| 519 | |
| 520 | // Check for required inputs |
| 521 | for _, input := range inputs { |
| 522 | // Illegal combination |
| 523 | if input.Required && input.Default != "" { |
| 524 | return nil, fmt.Errorf("input %s can not be required and have a default at the same time", input.Name) |
| 525 | } |
| 526 | |
| 527 | // if the input exists, it might be an expression, apply bindings to see if it has a value |
| 528 | argValue := args[input.Name] |
| 529 | var err error |
| 530 | if argValue != "" { |
| 531 | argValue, err = templates.ApplyBinding(argValue, bindings) |
| 532 | if err != nil { |
| 533 | return nil, err |
| 534 | } |
| 535 | } |
| 536 | |
| 537 | // if the input is not present, or the computed value is empty, we need to check if it's required |
| 538 | if _, ok := args[input.Name]; !ok || argValue == "" { |
| 539 | if input.Required { |
| 540 | return nil, fmt.Errorf("missing required input %q", input.Name) |
| 541 | } |
| 542 | // if not required, and it has a default value, let's use it |
| 543 | if argValue == "" && input.Default != "" { |
| 544 | value, err := templates.ApplyBinding(input.Default, bindings) |
| 545 | if err != nil { |
| 546 | return nil, err |
| 547 | } |
| 548 | result[input.Name] = value |
| 549 | } |
| 550 | } |
| 551 | } |
| 552 | |
| 553 | // check for provided arguments |
| 554 | for k, v := range args { |
| 555 | expected := slices.ContainsFunc(inputs, func(input *v1.PolicyInput) bool { |
| 556 | return input.Name == k |
| 557 | }) |
| 558 | if !expected { |
| 559 | logger.Warn().Msgf("argument %q not defined in policy %q spec, ignoring it", k, name) |
| 560 | continue |
| 561 | } |
| 562 | value, err := templates.ApplyBinding(v, bindings) |
| 563 | if err != nil { |
| 564 | return nil, err |
| 565 | } |
| 566 | result[k] = value |
| 567 | } |
| 568 |