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update.go
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update.go
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// Copyright 2018 Shift Devices AG
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package backend
import (
"encoding/json"
"net/http"
"github.com/digitalbitbox/bitbox-wallet-app/util/errp"
"github.com/digitalbitbox/bitbox-wallet-app/util/logging"
"github.com/digitalbitbox/bitbox-wallet-app/util/semver"
)
const updateFileURL = "https://shiftcrypto.ch/updates/desktop.json"
var (
// Version of the backend as displayed to the user.
Version = semver.NewSemVer(4, 8, 0)
)
// UpdateFile is retrieved from the server.
type UpdateFile struct {
// CurrentVersion stores the current version and is not loaded from the server.
CurrentVersion *semver.SemVer `json:"current"`
// NewVersion stores the new version and may not be nil.
NewVersion *semver.SemVer `json:"version"`
// Description gives additional information on the release.
Description string `json:"description"`
}
// CheckForUpdate checks whether a newer version of this application has been released.
// It returns the retrieved update file if a newer version has been released and nil otherwise.
func CheckForUpdate() (*UpdateFile, error) {
response, err := http.Get(updateFileURL)
if err != nil {
return nil, errp.WithStack(err)
}
defer func() {
_ = response.Body.Close()
}()
var updateFile UpdateFile
err = json.NewDecoder(response.Body).Decode(&updateFile)
if err != nil {
return nil, errp.WithStack(err)
}
if Version.AtLeast(updateFile.NewVersion) {
return nil, nil
}
updateFile.CurrentVersion = Version
return &updateFile, nil
}
// CheckForUpdateIgnoringErrors suppresses any errors that are triggered, for example, when offline.
func CheckForUpdateIgnoringErrors() *UpdateFile {
updateFile, err := CheckForUpdate()
if err != nil {
logging.Get().WithGroup("update").WithError(err).Warn("Check for update failed.")
return nil
}
return updateFile
}