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https://github.com/edgelesssys/constellation.git
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c9cae643e2
* Fix unmarshalling attestation version numbers from JSON * Add unit test for UnmarshalJSON --------- Signed-off-by: Daniel Weiße <dw@edgeless.systems>
96 lines
2.6 KiB
Go
96 lines
2.6 KiB
Go
/*
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Copyright (c) Edgeless Systems GmbH
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SPDX-License-Identifier: AGPL-3.0-only
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*/
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package config
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import (
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"encoding/json"
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"fmt"
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"math"
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"strconv"
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"strings"
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)
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const placeholderVersionValue = 0
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// NewLatestPlaceholderVersion returns the latest version with a placeholder version value.
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func NewLatestPlaceholderVersion() AttestationVersion {
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return AttestationVersion{
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Value: placeholderVersionValue,
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WantLatest: true,
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}
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}
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// AttestationVersion is a type that represents a version of a SNP.
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type AttestationVersion struct {
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Value uint8
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WantLatest bool
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}
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// MarshalYAML implements a custom marshaller to resolve "latest" values.
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func (v AttestationVersion) MarshalYAML() (any, error) {
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if v.WantLatest {
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return "latest", nil
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}
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return v.Value, nil
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}
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// UnmarshalYAML implements a custom unmarshaller to resolve "atest" values.
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func (v *AttestationVersion) UnmarshalYAML(unmarshal func(any) error) error {
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var rawUnmarshal string
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if err := unmarshal(&rawUnmarshal); err != nil {
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return fmt.Errorf("raw unmarshal: %w", err)
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}
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return v.parseRawUnmarshal(rawUnmarshal)
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}
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// MarshalJSON implements a custom marshaller to resolve "latest" values.
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func (v AttestationVersion) MarshalJSON() ([]byte, error) {
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if v.WantLatest {
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return json.Marshal("latest")
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}
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return json.Marshal(v.Value)
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}
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// UnmarshalJSON implements a custom unmarshaller to resolve "latest" values.
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func (v *AttestationVersion) UnmarshalJSON(data []byte) (err error) {
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// JSON has two distinct ways to represent numbers and strings.
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// This means we cannot simply unmarshal to string, like with YAML.
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// Unmarshalling to `any` causes Go to unmarshal numbers to float64.
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// Therefore, try to unmarshal to string, and then to int, instead of using type assertions.
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var unmarshalString string
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if err := json.Unmarshal(data, &unmarshalString); err != nil {
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var unmarshalInt int64
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if err := json.Unmarshal(data, &unmarshalInt); err != nil {
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return fmt.Errorf("unable to unmarshal to string or int: %w", err)
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}
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unmarshalString = strconv.FormatInt(unmarshalInt, 10)
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}
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return v.parseRawUnmarshal(unmarshalString)
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}
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func (v *AttestationVersion) parseRawUnmarshal(str string) error {
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if strings.HasPrefix(str, "0") && len(str) != 1 {
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return fmt.Errorf("no format with prefixed 0 (octal, hexadecimal) allowed: %s", str)
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}
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if strings.ToLower(str) == "latest" {
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v.WantLatest = true
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v.Value = placeholderVersionValue
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} else {
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ui, err := strconv.ParseUint(str, 10, 8)
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if err != nil {
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return fmt.Errorf("invalid version value: %s", str)
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}
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if ui > math.MaxUint8 {
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return fmt.Errorf("integer value is out ouf uint8 range: %d", ui)
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}
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v.Value = uint8(ui)
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}
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return nil
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}
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