/
mmdb.go
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/
mmdb.go
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// Copyright (c) 2018, Janoš Guljaš <janos@resenje.org>
// All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found s the LICENSE file.
// Package mmdb is a Go library for downloading and updating
// MaxMind GeoLite2 databases.
//
// Functions will download tar archive, extract the database file from it
// to a provided file name, and save MD5 sum of tar archive in a file
// in the same directory as the database file. MD5 sum is used for checking
// if the database is updated on the next function call.
package mmdb
import (
"archive/tar"
"bytes"
"compress/gzip"
"context"
"io"
"io/ioutil"
"net/http"
"os"
"path/filepath"
"strings"
"github.com/pkg/errors"
)
// GeoLite2 download URLs.
var (
geoLite2CityURL = "http://geolite.maxmind.com/download/geoip/database/GeoLite2-City.tar.gz"
geoLite2CountryURL = "http://geolite.maxmind.com/download/geoip/database/GeoLite2-Country.tar.gz"
geoLite2ASNURL = "http://geolite.maxmind.com/download/geoip/database/GeoLite2-ASN.tar.gz"
)
// GeoLite2 database filenames inside tar archives.
var (
geoLite2CityFilename = "GeoLite2-City.mmdb"
geoLite2CountryFilename = "GeoLite2-Country.mmdb"
geoLite2ASNFilename = "GeoLite2-ASN.mmdb"
)
// UpdateGeoLite2Country downloads and updates a GeoLite2 Country database and saves it
// under filename. MD5 sum of the tar archive is saved in a file in the same directory
// for update checks.
func UpdateGeoLite2Country(ctx context.Context, filename string) (saved bool, err error) {
return update(ctx, filename, geoLite2CountryFilename, geoLite2CountryURL)
}
// UpdateGeoLite2City downloads and updates a GeoLite2 City database and saves it
// under filename. MD5 sum of the tar archive is saved in a file in the same directory
// for update checks.
func UpdateGeoLite2City(ctx context.Context, filename string) (saved bool, err error) {
return update(ctx, filename, geoLite2CityFilename, geoLite2CityURL)
}
// UpdateGeoLite2ASN downloads and updates a GeoLite2 ASN database and saves it
// under filename. MD5 sum of the tar archive is saved in a file in the same directory
// for update checks.
func UpdateGeoLite2ASN(ctx context.Context, filename string) (saved bool, err error) {
return update(ctx, filename, geoLite2ASNFilename, geoLite2ASNURL)
}
func update(ctx context.Context, filename, dbname, url string) (saved bool, err error) {
req, err := http.NewRequest(http.MethodGet, url+".md5", nil)
if err != nil {
return false, errors.WithMessage(err, "http request md5 file")
}
if ctx != nil {
req = req.WithContext(ctx)
}
r, err := http.DefaultClient.Do(req)
if err != nil {
return false, errors.WithMessage(err, "get md5 file")
}
defer r.Body.Close()
md5, err := ioutil.ReadAll(r.Body)
if err != nil {
return false, errors.WithMessage(err, "download md5 file")
}
md5 = bytes.TrimSpace(md5)
md5Filename := filepath.Join(filepath.Dir(filename), req.URL.Path[strings.LastIndex(req.URL.Path, "/")+1:])
if _, err := os.Stat(md5Filename); err == nil {
md5Current, err := ioutil.ReadFile(md5Filename)
if err != nil {
return false, errors.WithMessage(err, "open md5 file")
}
md5Current = bytes.TrimSpace(md5Current)
if bytes.Equal(md5, md5Current) {
return false, nil
}
}
req, err = http.NewRequest(http.MethodGet, url, nil)
if err != nil {
return false, errors.WithMessage(err, "http request")
}
if ctx != nil {
req = req.WithContext(ctx)
}
r, err = http.DefaultClient.Do(req)
if err != nil {
return false, errors.WithMessage(err, "get tar")
}
defer r.Body.Close()
gzr, err := gzip.NewReader(r.Body)
if err != nil {
return false, errors.WithMessage(err, "gzip reader")
}
tr := tar.NewReader(gzr)
for {
header, err := tr.Next()
if err != nil {
if err == io.EOF {
break
}
return false, errors.WithMessage(err, "read tar")
}
if strings.HasSuffix(header.Name, dbname) {
if err := os.MkdirAll(filepath.Dir(filename), 0777); err != nil {
return false, errors.WithMessage(err, "create directory")
}
writer, err := os.Create(filename)
if err != nil {
return false, errors.WithMessage(err, "create db file")
}
_, err = io.Copy(writer, tr)
err = errors.WithMessage(err, "write db file")
writer.Close()
if err == nil {
saved = true
}
break
}
}
if saved {
if err := ioutil.WriteFile(md5Filename, md5, 0666); err != nil {
return false, errors.WithMessage(err, "write md5 file")
}
if setTestM5Filename != nil {
setTestM5Filename(md5Filename)
}
}
return saved, err
}
var (
testMD5Filename string
setTestM5Filename func(md5Filename string)
)