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98 lines
3.1 KiB
98 lines
3.1 KiB
// Copyright 2018 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package dashboard
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import (
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"net"
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"time"
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"github.com/apilayer/freegeoip"
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)
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// geoDBInfo contains all the geographical information we could extract based on an IP
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// address.
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type geoDBInfo struct {
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Country struct {
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Names struct {
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English string `maxminddb:"en" json:"en,omitempty"`
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} `maxminddb:"names" json:"names,omitempty"`
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} `maxminddb:"country" json:"country,omitempty"`
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City struct {
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Names struct {
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English string `maxminddb:"en" json:"en,omitempty"`
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} `maxminddb:"names" json:"names,omitempty"`
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} `maxminddb:"city" json:"city,omitempty"`
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Location struct {
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Latitude float64 `maxminddb:"latitude" json:"latitude,omitempty"`
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Longitude float64 `maxminddb:"longitude" json:"longitude,omitempty"`
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} `maxminddb:"location" json:"location,omitempty"`
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}
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// geoLocation contains geographical information.
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type geoLocation struct {
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Country string `json:"country,omitempty"`
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City string `json:"city,omitempty"`
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Latitude float64 `json:"latitude,omitempty"`
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Longitude float64 `json:"longitude,omitempty"`
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}
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// geoDB represents a geoip database that can be queried for IP to geographical
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// information conversions.
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type geoDB struct {
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geodb *freegeoip.DB
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}
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// Open creates a new geoip database with an up-to-date database from the internet.
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func openGeoDB() (*geoDB, error) {
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// Initiate a geoip database to cross reference locations
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db, err := freegeoip.OpenURL(freegeoip.MaxMindDB, 24*time.Hour, time.Hour)
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if err != nil {
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return nil, err
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}
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// Wait until the database is updated to the latest data
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select {
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case <-db.NotifyOpen():
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case err := <-db.NotifyError():
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return nil, err
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}
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// Assemble and return our custom wrapper
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return &geoDB{geodb: db}, nil
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}
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// Close terminates the database background updater.
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func (db *geoDB) close() error {
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db.geodb.Close()
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return nil
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}
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// Lookup converts an IP address to a geographical location.
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func (db *geoDB) lookup(ip net.IP) *geoDBInfo {
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result := new(geoDBInfo)
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db.geodb.Lookup(ip, result)
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return result
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}
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// Location retrieves the geographical location of the given IP address.
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func (db *geoDB) location(ip string) *geoLocation {
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location := db.lookup(net.ParseIP(ip))
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return &geoLocation{
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Country: location.Country.Names.English,
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City: location.City.Names.English,
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Latitude: location.Location.Latitude,
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Longitude: location.Location.Longitude,
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}
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}
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