hotfix(publicip): return an error if trying to use cloudflare as ip provider for updating servers data

internal/provider/common/updater.go

@@ -10,8 +10,9 @@ import (
 )
 
 var (
-	ErrNotEnoughServers    = errors.New("not enough servers found")
-	ErrHTTPStatusCodeNotOK = errors.New("HTTP status code not OK")
+	ErrNotEnoughServers     = errors.New("not enough servers found")
+	ErrHTTPStatusCodeNotOK  = errors.New("HTTP status code not OK")
+	ErrIPFetcherUnsupported = errors.New("IP fetcher not supported")
 )
 
 type Fetcher interface {
@@ -33,5 +34,7 @@ type Warner interface {
 }
 
 type IPFetcher interface {
+	String() string
+	CanFetchAnyIP() bool
 	FetchInfo(ctx context.Context, ip netip.Addr) (result models.PublicIP, err error)
 }

internal/provider/privado/updater/servers.go

@@ -14,6 +14,10 @@ import (
 func (u *Updater) FetchServers(ctx context.Context, minServers int) (
 	servers []models.Server, err error,
 ) {
+	if !u.ipFetcher.CanFetchAnyIP() {
+		return nil, fmt.Errorf("%w: %s", common.ErrIPFetcherUnsupported, u.ipFetcher.String())
+	}
+
 	const url = "https://privadovpn.com/apps/ovpn_configs.zip"
 	contents, err := u.unzipper.FetchAndExtract(ctx, url)
 	if err != nil {

internal/provider/purevpn/updater/servers.go

@@ -16,6 +16,10 @@ import (
 func (u *Updater) FetchServers(ctx context.Context, minServers int) (
 	servers []models.Server, err error,
 ) {
+	if !u.ipFetcher.CanFetchAnyIP() {
+		return nil, fmt.Errorf("%w: %s", common.ErrIPFetcherUnsupported, u.ipFetcher.String())
+	}
+
 	const url = "https://d11a57lttb2ffq.cloudfront.net/heartbleed/router/Recommended-CA2.zip"
 	contents, err := u.unzipper.FetchAndExtract(ctx, url)
 	if err != nil {