107 lines
2.9 KiB
Go
107 lines
2.9 KiB
Go
/*
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* Copyright © 2018-2019 A Bunch Tell LLC.
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*
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* This file is part of WriteFreely.
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*
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* WriteFreely is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License, included
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* in the LICENSE file in this source code package.
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*/
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package writefreely
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import (
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"io/ioutil"
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"net/http"
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"strings"
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"sync"
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"time"
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)
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// updatesCacheTime is the default interval between cache updates for new
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// software versions
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const defaultUpdatesCacheTime = 12 * time.Hour
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// updatesCache holds data about current and new releases of the writefreely
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// software
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type updatesCache struct {
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mu sync.Mutex
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frequency time.Duration
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lastCheck time.Time
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latestVersion string
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currentVersion string
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}
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// CheckNow asks for the latest released version of writefreely and updates
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// the cache last checked time. If the version postdates the current 'latest'
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// the version value is replaced.
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func (uc *updatesCache) CheckNow() error {
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uc.mu.Lock()
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defer uc.mu.Unlock()
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latestRemote, err := newVersionCheck()
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if err != nil {
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return err
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}
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uc.lastCheck = time.Now()
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if CompareSemver(latestRemote, uc.latestVersion) == 1 {
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uc.latestVersion = latestRemote
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}
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return nil
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}
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// AreAvailable updates the cache if the frequency duration has passed
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// then returns if the latest release is newer than the current running version.
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func (uc updatesCache) AreAvailable() bool {
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if time.Since(uc.lastCheck) > uc.frequency {
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uc.CheckNow()
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}
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return CompareSemver(uc.latestVersion, uc.currentVersion) == 1
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}
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// LatestVersion returns the latest stored version available.
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func (uc updatesCache) LatestVersion() string {
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return uc.latestVersion
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}
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// ReleaseURL returns the full URL to the blog.writefreely.org release notes
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// for the latest version as stored in the cache.
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func (uc updatesCache) ReleaseURL() string {
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ver := strings.TrimPrefix(uc.latestVersion, "v")
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ver = strings.TrimSuffix(ver, ".0")
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// hack until go 1.12 in build/travis
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seg := strings.Split(ver, ".")
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return "https://blog.writefreely.org/version-" + strings.Join(seg, "-")
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}
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// newUpdatesCache returns an initialized updates cache
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func newUpdatesCache(expiry time.Duration) *updatesCache {
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cache := updatesCache{
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frequency: expiry,
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currentVersion: "v" + softwareVer,
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}
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cache.CheckNow()
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return &cache
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}
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// InitUpdates initializes the updates cache, if the config value is set
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// It uses the defaultUpdatesCacheTime for the cache expiry
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func (app *App) InitUpdates() {
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if app.cfg.App.UpdateChecks {
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app.updates = newUpdatesCache(defaultUpdatesCacheTime)
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}
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}
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func newVersionCheck() (string, error) {
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res, err := http.Get("https://version.writefreely.org")
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if err == nil && res.StatusCode == http.StatusOK {
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defer res.Body.Close()
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body, err := ioutil.ReadAll(res.Body)
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if err != nil {
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return "", err
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}
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return string(body), nil
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}
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return "", err
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}
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