IliaDenisov
85 lines
2.2 KiB
Go
85 lines
2.2 KiB
Go
package loader
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import (
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"errors"
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"fmt"
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"galaxy/connector"
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"galaxy/util"
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)
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func (l *loader) checkAndDownloadPluginVersion() error {
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versions, err := l.connector.CheckVersion()
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if err != nil {
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return err
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} else if latest, ok, err := latestVersion(versions); err != nil {
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return err
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} else if ok {
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return l.preparePluginVersion(latest)
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} else {
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return errors.New("Server did not respond with a suitable client version")
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}
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}
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// preparePluginVersion fetches and stores given version of plugin artifact, if newer to the current known version.
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func (l *loader) preparePluginVersion(v connector.VersionInfo) error {
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s, exists, err := l.loadCurrentState()
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if err != nil {
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return err
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}
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version, err := util.ParseSemver(v.Version)
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if err != nil {
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return err
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}
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if exists {
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currentVersion, err := util.ParseSemver(s.ClientCurrentVersion)
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if err != nil {
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return err
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}
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if util.CompareSemver(currentVersion, version) > 0 {
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return nil
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}
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}
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err = l.downloadPlugin(v.URL, v.Version, v.Checksum)
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if err != nil {
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return err
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}
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return nil
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}
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// downloadPlugin downloads and stores at the App's local storage with a pre-defined name with semver suffix.
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func (l *loader) downloadPlugin(url, version string, checksum [32]byte) error {
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data, err := l.connector.DownloadVersion(url)
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if err != nil {
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return fmt.Errorf("Plugin v%s download error: %w", version, err)
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}
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dataChecksum := SumSHA256(data)
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if !EqualSHA256(checksum, dataChecksum) {
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return errors.New("Downloaded pligin checksum incorrect")
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}
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versionFileName := resolvePluginFile(version)
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versionFileExists, _, err := l.storage.FileExists(versionFileName)
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if err != nil {
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return fmt.Errorf("Check plugin v%s exists error: %w", version, err)
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}
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if versionFileExists {
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storedData, err := l.storage.ReadFile(versionFileName)
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if err != nil {
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return err
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}
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if EqualSHA256(dataChecksum, SumSHA256(storedData)) {
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return nil
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}
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if err := l.storage.DeleteFile(versionFileName); err != nil {
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return fmt.Errorf("Plugin v%s delete error: %w", version, err)
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}
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}
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err = l.storage.WriteFile(versionFileName, data)
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if err != nil {
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return fmt.Errorf("Plugin file write error: %w", err)
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}
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if err := l.setNextVersion(&version); err != nil {
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return err
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}
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return nil
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}
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