/
updater.go
99 lines (83 loc) · 2.14 KB
/
updater.go
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package updater
import (
"encoding/json"
"fmt"
"net/http"
"runtime"
"github.com/aquasecurity/tfsec/version"
semver "github.com/hashicorp/go-version"
"github.com/inconshreveable/go-update"
)
type githubRelease struct {
TagName string `json:"tag_name"`
}
func Update() (string, error) {
if version.Version == "" {
return "", fmt.Errorf("you are running a locally built version")
}
latestAvailable, err := getLatestVersion()
if err != nil {
return "", err
}
updated, err := updateIfNewer(latestAvailable)
if err != nil {
return "", err
}
if !updated {
return "", nil
}
return latestAvailable, nil
}
func getLatestVersion() (string, error) {
resp, err := http.Get("https://api.github.com/repos/aquasecurity/tfsec/releases/latest")
if err != nil {
return "", err
}
if resp.StatusCode != 200 {
return "", fmt.Errorf("error occurred when trying to download latest release data")
}
defer func() { _ = resp.Body.Close() }()
var release githubRelease
if err := json.NewDecoder(resp.Body).Decode(&release); err != nil {
return "", err
}
return release.TagName, nil
}
func isNewerVersion(latestVersion string) (bool, error) {
v1, err := semver.NewVersion(version.Version)
if err != nil {
return false, err
}
v2, err := semver.NewVersion(latestVersion)
if err != nil {
return false, err
}
return v1.LessThan(v2), nil
}
func updateIfNewer(latest string) (bool, error) {
if newer, err := isNewerVersion(latest); err != nil {
return false, err
} else if !newer {
return false, nil
}
downloadUrl := resolveDownloadUrl(latest)
resp, err := http.Get(downloadUrl) //nolint
if err != nil {
return false, err
}
defer func() { _ = resp.Body.Close() }()
if resp.StatusCode != 200 {
return false, fmt.Errorf("failed to download the latest version of tfsec")
}
if err := update.Apply(resp.Body, update.Options{}); err != nil {
return false, err
}
return true, nil
}
func resolveDownloadUrl(latest string) string {
suffix := ""
if runtime.GOOS == "windows" {
suffix = ".exe"
}
return fmt.Sprintf("https://github.com/aquasecurity/tfsec/releases/download/%s/tfsec-%s-%s%s", latest, runtime.GOOS, runtime.GOARCH, suffix)
}