71 lines
1.9 KiB
Go
71 lines
1.9 KiB
Go
package tuf
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import (
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"fmt"
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"strings"
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"github.com/Masterminds/semver/v3"
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"github.com/docker/attest/version"
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)
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const ThisModulePath = "github.com/docker/attest"
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type VersionChecker interface {
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// CheckVersion checks if the current version of this library meets the constraints from the TUF repo
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CheckVersion(tufClient Downloader) error
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}
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type InvalidVersionError struct {
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AttestVersion string
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VersionConstraint string
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Errors []error
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}
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func (e *InvalidVersionError) Error() string {
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var errsStr strings.Builder
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for i, err := range e.Errors {
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if i > 0 {
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errsStr.WriteString("; ")
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}
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errsStr.WriteString(err.Error())
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}
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return fmt.Sprintf("%s version %s does not satisfy constraints %s: %s", ThisModulePath, e.AttestVersion, e.VersionConstraint, errsStr.String())
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}
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func NewDefaultVersionChecker() *DefaultVersionChecker {
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return &DefaultVersionChecker{}
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}
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type DefaultVersionChecker struct{}
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func (vc *DefaultVersionChecker) CheckVersion(client Downloader) error {
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attestVersion, err := version.Get()
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if err != nil {
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return fmt.Errorf("failed to get version: %w", err)
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}
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if attestVersion == nil {
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return nil
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}
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// see https://github.com/Masterminds/semver/blob/v3.2.1/README.md#checking-version-constraints
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// for more information on the expected format of the version constraints in the TUF repo
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target, err := client.DownloadTarget("version-constraints", "")
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if err != nil {
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return fmt.Errorf("failed to download version-constraints: %w", err)
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}
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versionConstraints, err := semver.NewConstraint(string(target.Data))
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if err != nil {
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return fmt.Errorf("failed to parse minimum version: %w", err)
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}
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ok, errs := versionConstraints.Validate(attestVersion)
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if !ok {
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return &InvalidVersionError{
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AttestVersion: attestVersion.String(),
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VersionConstraint: versionConstraints.String(),
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Errors: errs,
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}
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}
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return nil
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}
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