package updater import ( "encoding/json" "fmt" "io" "net/http" "strings" "time" "github.com/AdguardTeam/AdGuardHome/internal/aghio" "github.com/AdguardTeam/golibs/errors" ) // TODO(a.garipov): Make configurable. const versionCheckPeriod = 8 * time.Hour // VersionInfo contains information about a new version. type VersionInfo struct { CanAutoUpdate *bool `json:"can_autoupdate,omitempty"` NewVersion string `json:"new_version,omitempty"` Announcement string `json:"announcement,omitempty"` AnnouncementURL string `json:"announcement_url,omitempty"` SelfUpdateMinVersion string `json:"-"` } // MaxResponseSize is responses on server's requests maximum length in bytes. const MaxResponseSize = 64 * 1024 // VersionInfo downloads the latest version information. If forceRecheck is // false and there are cached results, those results are returned. func (u *Updater) VersionInfo(forceRecheck bool) (vi VersionInfo, err error) { u.mu.Lock() defer u.mu.Unlock() now := time.Now() recheckTime := u.prevCheckTime.Add(versionCheckPeriod) if !forceRecheck && now.Before(recheckTime) { return u.prevCheckResult, u.prevCheckError } var resp *http.Response vcu := u.versionCheckURL resp, err = u.client.Get(vcu) if err != nil { return VersionInfo{}, fmt.Errorf("updater: HTTP GET %s: %w", vcu, err) } defer func() { err = errors.WithDeferred(err, resp.Body.Close()) }() var r io.Reader r, err = aghio.LimitReader(resp.Body, MaxResponseSize) if err != nil { return VersionInfo{}, fmt.Errorf("updater: LimitReadCloser: %w", err) } // This use of ReadAll is safe, because we just limited the appropriate // ReadCloser. body, err := io.ReadAll(r) if err != nil { return VersionInfo{}, fmt.Errorf("updater: HTTP GET %s: %w", vcu, err) } u.prevCheckTime = time.Now() u.prevCheckResult, u.prevCheckError = u.parseVersionResponse(body) return u.prevCheckResult, u.prevCheckError } func (u *Updater) parseVersionResponse(data []byte) (VersionInfo, error) { var canAutoUpdate bool info := VersionInfo{ CanAutoUpdate: &canAutoUpdate, } versionJSON := map[string]string{ "version": "", "announcement": "", "announcement_url": "", "selfupdate_min_version": "", } err := json.Unmarshal(data, &versionJSON) if err != nil { return info, fmt.Errorf("version.json: %w", err) } for _, v := range versionJSON { if v == "" { return info, fmt.Errorf("version.json: invalid data") } } info.NewVersion = versionJSON["version"] info.Announcement = versionJSON["announcement"] info.AnnouncementURL = versionJSON["announcement_url"] info.SelfUpdateMinVersion = versionJSON["selfupdate_min_version"] packageURL, ok := u.downloadURL(versionJSON) if ok && info.NewVersion != u.version && strings.TrimPrefix(u.version, "v") >= strings.TrimPrefix(info.SelfUpdateMinVersion, "v") { canAutoUpdate = true } u.newVersion = info.NewVersion u.packageURL = packageURL return info, nil } // downloadURL returns the download URL for current build. func (u *Updater) downloadURL(json map[string]string) (string, bool) { var key string if u.goarch == "arm" && u.goarm != "" { key = fmt.Sprintf("download_%s_%sv%s", u.goos, u.goarch, u.goarm) } else if u.goarch == "mips" && u.gomips != "" { key = fmt.Sprintf("download_%s_%s_%s", u.goos, u.goarch, u.gomips) } val, ok := json[key] if !ok { key = fmt.Sprintf("download_%s_%s", u.goos, u.goarch) val, ok = json[key] } if !ok { return "", false } return val, true }