Add publig IP getter

Ref #3

This commit uses a GET query to ifconfig.me in order to get the current
public IP. It also modifies the initialization message to send the
current public IP to the Telegram channel instead of a simple message.
This commit is contained in:
Melora Hugues 2023-01-25 21:06:00 +01:00
parent 54de3b84cd
commit 3948c8e7b4
3 changed files with 204 additions and 1 deletions

View file

@ -6,6 +6,7 @@ import (
"time" "time"
"git.faercol.me/faercol/public-ip-tracker/tracker/config" "git.faercol.me/faercol/public-ip-tracker/tracker/config"
"git.faercol.me/faercol/public-ip-tracker/tracker/ip"
"github.com/ahugues/go-telegram-api/bot" "github.com/ahugues/go-telegram-api/bot"
) )
@ -14,10 +15,16 @@ type Notifier struct {
cancel context.CancelFunc cancel context.CancelFunc
tgBot *bot.ConcreteBot tgBot *bot.ConcreteBot
notifChannel int64 notifChannel int64
ipGetter *ip.IPGetter
} }
func (n *Notifier) SendInitMessage() error { func (n *Notifier) SendInitMessage() error {
initMsg := fmt.Sprintf("Public IP tracked initialized at %v", time.Now()) publicIP, err := n.ipGetter.GetCurrentPublicIP(n.ctx)
if err != nil {
return fmt.Errorf("failed to get current public IP: %w", err)
}
initMsg := fmt.Sprintf("Public IP tracker initialized at %v, public IP is %s", time.Now(), publicIP)
if err := n.tgBot.SendMessage(n.ctx, n.notifChannel, initMsg); err != nil { if err := n.tgBot.SendMessage(n.ctx, n.notifChannel, initMsg); err != nil {
return fmt.Errorf("failed to send initialization message: %w", err) return fmt.Errorf("failed to send initialization message: %w", err)
} }
@ -33,5 +40,6 @@ func New(ctx context.Context, config *config.Config) *Notifier {
cancel: cancel, cancel: cancel,
tgBot: tgBot, tgBot: tgBot,
notifChannel: config.Telegram.ChannelID, notifChannel: config.Telegram.ChannelID,
ipGetter: ip.New(),
} }
} }

61
tracker/ip/ip.go Normal file
View file

@ -0,0 +1,61 @@
package ip
import (
"bytes"
"context"
"fmt"
"io"
"net"
"net/http"
"time"
)
const ifconfigURL = "https://ifconfig.me"
const httpMaxRead = 100
const httpTimeout = 10 * time.Second
type IPGetter struct {
httpClt *http.Client
remoteAddress string
timeout time.Duration
}
func (c *IPGetter) GetCurrentPublicIP(ctx context.Context) (net.IP, error) {
reqCtx, cancel := context.WithTimeout(ctx, c.timeout)
defer cancel()
req, err := http.NewRequestWithContext(reqCtx, http.MethodGet, c.remoteAddress, nil)
if err != nil {
return nil, fmt.Errorf("failed to prepare public IP request: %w", err)
}
resp, err := c.httpClt.Do(req)
if err != nil {
return nil, fmt.Errorf("failed to get current IP from ifconfig: %w", err)
}
if resp.StatusCode != http.StatusOK {
return nil, fmt.Errorf("invalid returncode %d", resp.StatusCode)
}
if resp.ContentLength > httpMaxRead {
return nil, fmt.Errorf("response too big: %d/%d", resp.ContentLength, httpMaxRead)
}
buf := bytes.NewBuffer([]byte{})
if _, err := io.CopyN(buf, resp.Body, resp.ContentLength); err != nil {
return nil, fmt.Errorf("error parsing body: %w", err)
}
content := string(buf.Bytes())
res := net.ParseIP(content)
if res == nil {
return nil, fmt.Errorf("got an invalid public IP %q", content)
}
return res, nil
}
func New() *IPGetter {
return &IPGetter{
httpClt: http.DefaultClient,
remoteAddress: ifconfigURL,
timeout: httpTimeout,
}
}

134
tracker/ip/ip_test.go Normal file
View file

@ -0,0 +1,134 @@
package ip
import (
"context"
"net/http"
"net/http/httptest"
"strings"
"testing"
"time"
)
func TestGetIPOK(t *testing.T) {
t.Parallel()
mockSrv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
w.WriteHeader(http.StatusOK)
w.Write([]byte("198.51.100.42"))
}))
defer mockSrv.Close()
clt := IPGetter{
httpClt: mockSrv.Client(),
remoteAddress: mockSrv.URL,
timeout: 1 * time.Second,
}
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
val, err := clt.GetCurrentPublicIP(ctx)
if err != nil {
t.Fatalf("Unexpected error %s", err.Error())
}
if val.String() != "198.51.100.42" {
t.Fatalf("Unexpected public IP %v", val)
}
}
func TestGetIPServerErr(t *testing.T) {
t.Parallel()
mockSrv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
w.WriteHeader(http.StatusInternalServerError)
}))
defer mockSrv.Close()
clt := IPGetter{
httpClt: mockSrv.Client(),
remoteAddress: mockSrv.URL,
timeout: 1 * time.Second,
}
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
_, err := clt.GetCurrentPublicIP(ctx)
if err == nil {
t.Fatal("Unexpected nil error")
} else if err.Error() != "invalid returncode 500" {
t.Fatalf("Unexpected error %s", err.Error())
}
}
func TestGetIPUnreachable(t *testing.T) {
t.Parallel()
mockSrv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
}))
mockSrv.Close()
clt := IPGetter{
httpClt: mockSrv.Client(),
remoteAddress: mockSrv.URL,
timeout: 1 * time.Second,
}
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
_, err := clt.GetCurrentPublicIP(ctx)
if err == nil {
t.Fatal("Unexpected nil error")
} else if !strings.Contains(err.Error(), "connect: connection refused") {
t.Fatalf("Unexpected error %s", err.Error())
}
}
func TestGetIPInvalidResponse(t *testing.T) {
t.Parallel()
mockSrv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
w.WriteHeader(http.StatusOK)
w.Write([]byte("toto"))
}))
defer mockSrv.Close()
clt := IPGetter{
httpClt: mockSrv.Client(),
remoteAddress: mockSrv.URL,
timeout: 1 * time.Second,
}
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
_, err := clt.GetCurrentPublicIP(ctx)
if err == nil {
t.Fatal("Unexpected nil error")
} else if err.Error() != `got an invalid public IP "toto"` {
t.Fatalf("Unexpected error %s", err.Error())
}
}
func TestGetIPTimeout(t *testing.T) {
t.Parallel()
mockSrv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
time.Sleep(100 * time.Millisecond)
w.WriteHeader(http.StatusOK)
w.Write([]byte("toto"))
}))
defer mockSrv.Close()
clt := IPGetter{
httpClt: mockSrv.Client(),
remoteAddress: mockSrv.URL,
timeout: 1 * time.Millisecond,
}
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
_, err := clt.GetCurrentPublicIP(ctx)
if err == nil {
t.Fatal("Unexpected nil error")
} else if !strings.Contains(err.Error(), "context deadline exceeded") {
t.Fatalf("Unexpected error %s", err.Error())
}
}