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vergrabber.go
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vergrabber.go
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// Update Checker
// Copyright (C) 2020 Florian Probst
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package main
import (
"bufio"
"bytes"
"encoding/json"
"errors"
"io/ioutil"
"net/http"
"os"
"regexp"
"time"
"github.com/sqweek/dialog"
)
const vergrabberURL = "https://vergrabber.kingu.pl/vergrabber.json"
const vergrabberFile = "vergrabber.json"
// fetches current versions of common software from
// https://vergrabber.kingu.pl/vergrabber.json
func getSoftwareVersionsFromVergrabber() map[string]softwareReleaseStatus {
var jsonFromVergrabber []byte
softwareReleaseStatii := map[string]softwareReleaseStatus{}
/// first try to read cached file from filesystem
jsonFromVergrabber, err := ioutil.ReadFile(vergrabberFile)
if err != nil {
Trace.Println("no cached vergrabber.json file available, catching online version")
jsonFromVergrabber = downloadAndCacheVergrabberJSON()
if !isVergrabberJSONUptodate(jsonFromVergrabber) {
Info.Println("Downloaded vergrabber.json is not up-to-date")
dialog.Message("%s", "Downloaded vergrabber.json is not up-to-date. Aborting!").Title("Error").Error()
panic("Downloaded vergrabber.json is not up-to-date")
}
} else {
// checking if cached file is still up-to-date
if !isVergrabberJSONUptodate(jsonFromVergrabber) {
Trace.Println("cached vergrabber.json file is outdated, catching online version")
jsonFromVergrabber = downloadAndCacheVergrabberJSON()
jsonUptodate := isVergrabberJSONUptodate(jsonFromVergrabber)
if !jsonUptodate {
Info.Println("Downloaded vergrabber.json is not up-to-date")
dialog.Message("%s", "Downloaded vergrabber.json is not up-to-date. Aborting!").Title("Error").Error()
panic("Downloaded vergrabber.json is not up-to-date")
}
}
}
// parse JSON
var f map[string]map[string]map[string]softwareReleaseStatus
err = json.Unmarshal(jsonFromVergrabber, &f)
for softwareType, valueSoftwareType := range f {
//fmt.Println("Typ:", softwareType)
if softwareType == "client" || softwareType == "server" {
for softwareName, softwareDetails := range valueSoftwareType {
//fmt.Println("Name:", softwareName)
for softwareVersion, softwareVersionDetails := range softwareDetails {
softwareVersionDetails.Name = softwareName
softwareVersionDetails.MajorRelease = softwareVersion
softwareReleaseStatii[softwareName+" "+softwareVersion] = softwareVersionDetails
}
}
}
}
//Trace.Printf(fmt.Sprintf("Software Releases from Vergrabber: %#v\n", softwareReleaseStatii))
return softwareReleaseStatii
}
func isVergrabberJSONUptodate(jsonFromVergrabber []byte) bool {
updatedDate, err := getVergrabberUpdateDate(jsonFromVergrabber)
if err != nil {
Info.Println("Downloaded vergrabber.json is not up-to-date")
dialog.Message("%s", "Downloaded vergrabber.json is not up-to-date. Aborting!").Title("Error").Error()
panic("Downloaded vergrabber.json is not up-to-date")
}
// second: verify date
if !updatedDate.After(time.Now().Add(-time.Hour * 24 * 2)) {
// JSON is outdated
return false
}
// JSON is not outdated
return true
}
func downloadAndCacheVergrabberJSON() []byte {
// get JSON
Info.Println("Downloading vergrabber.json")
resp, err := http.Get(vergrabberURL)
if err != nil {
Info.Println("Could not catch vergrabber json from " + vergrabberURL)
dialog.Message("%s", "Could not catch vergrabber json from "+vergrabberURL).Title("Error").Error()
panic(err)
}
defer resp.Body.Close()
// reads json as a slice of bytes
jsonFromVergrabber, err := ioutil.ReadAll(resp.Body)
if err != nil {
Info.Println("Error reading vergrabber json: " + err.Error())
dialog.Message("%s", "Error reading vergrabber json: "+err.Error()).Title("Error").Error()
panic(err)
}
// Write file to disk
outputFile, err := os.Create(vergrabberFile)
if err != nil {
Info.Println(err)
dialog.Message("%s", err).Title("Info").Info()
}
defer outputFile.Close()
_, err = outputFile.Write(jsonFromVergrabber)
if err != nil {
Info.Println(err)
dialog.Message("%s", err).Title("Info").Info()
}
return jsonFromVergrabber
}
func getVergrabberUpdateDate(jsonFromVergrabber []byte) (time.Time, error) {
// regexp to search for "updated:" entry and its date
r, _ := regexp.Compile(".*updated\": \"(.*)\".*")
scanner := bufio.NewScanner(bytes.NewReader(jsonFromVergrabber))
for scanner.Scan() {
line := scanner.Text()
if r.MatchString(line) {
dateString := r.FindStringSubmatch(line)[1]
date, err := time.Parse("2006-01-02", dateString)
if err != nil {
Info.Println("Error getting update date from vergrabber json: Error in date conversion")
return time.Now(), errors.New("Could not get update date from vergrabber.json")
}
Trace.Printf("vergrabber.json updated: " + date.String())
return date, nil
}
}
if err := scanner.Err(); err != nil {
Info.Println("Error getting update date from vergrabber json: " + err.Error())
return time.Now(), errors.New("Could not get update date from vergrabber.json")
}
return time.Now(), errors.New("Could not get update date from vergrabber.json")
}