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parameter.go
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parameter.go
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package parser
import (
"bytes"
"encoding/json"
"fmt"
"strconv"
"strings"
"github.com/liamg/jfather"
"gopkg.in/yaml.v3"
"github.com/aquasecurity/trivy/pkg/iac/scanners/cloudformation/cftypes"
)
type Parameter struct {
inner parameterInner
}
type parameterInner struct {
Type string `yaml:"Type"`
Default any `yaml:"Default"`
}
func (p *Parameter) UnmarshalYAML(node *yaml.Node) error {
return node.Decode(&p.inner)
}
func (p *Parameter) UnmarshalJSONWithMetadata(node jfather.Node) error {
var inner parameterInner
if err := node.Decode(&inner); err != nil {
return err
}
// jfather parses Number without fraction as int64
// https://github.com/liamg/jfather/blob/4ef05d70c05af167226d3333a4ec7d8ac3c9c281/parse_number.go#L33-L42
switch v := inner.Default.(type) {
case int64:
inner.Default = int(v)
default:
inner.Default = v
}
p.inner = inner
return nil
}
func (p *Parameter) Type() cftypes.CfType {
switch p.inner.Type {
case "Boolean":
return cftypes.Bool
case "String":
return cftypes.String
case "Integer":
return cftypes.Int
default:
return cftypes.String
}
}
func (p *Parameter) Default() any {
return p.inner.Default
}
func (p *Parameter) UpdateDefault(inVal any) {
passedVal := inVal.(string)
switch p.inner.Type {
case "Boolean":
p.inner.Default, _ = strconv.ParseBool(passedVal)
case "String":
p.inner.Default = passedVal
case "Integer":
p.inner.Default, _ = strconv.Atoi(passedVal)
default:
p.inner.Default = passedVal
}
}
type Parameters map[string]any
func (p *Parameters) Merge(other Parameters) {
for k, v := range other {
(*p)[k] = v
}
}
func (p *Parameters) UnmarshalJSON(data []byte) error {
(*p) = make(Parameters)
if len(data) == 0 {
return nil
}
switch {
case data[0] == '{' && data[len(data)-1] == '}': // object
// CodePipeline like format
var params struct {
Params map[string]any `json:"Parameters"`
}
if err := json.Unmarshal(data, ¶ms); err != nil {
return err
}
(*p) = params.Params
case data[0] == '[' && data[len(data)-1] == ']': // array
// Original format
var params []string
if err := json.Unmarshal(data, ¶ms); err == nil {
for _, param := range params {
parts := strings.Split(param, "=")
if len(parts) != 2 {
return fmt.Errorf("invalid key-value parameter: %q", param)
}
(*p)[parts[0]] = parts[1]
}
return nil
}
// CloudFormation like format
var cfparams []struct {
ParameterKey string `json:"ParameterKey"`
ParameterValue string `json:"ParameterValue"`
}
d := json.NewDecoder(bytes.NewReader(data))
d.DisallowUnknownFields()
if err := d.Decode(&cfparams); err != nil {
return err
}
for _, param := range cfparams {
(*p)[param.ParameterKey] = param.ParameterValue
}
default:
return fmt.Errorf("unsupported parameters format")
}
return nil
}