chore(publicip): less coupling with ipinfo.io

internal/publicip/api/api.go

@@ -0,0 +1,47 @@
+package api
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"net/http"
+	"net/netip"
+	"strings"
+
+	"github.com/qdm12/gluetun/internal/models"
+)
+
+type API interface {
+	FetchInfo(ctx context.Context, ip netip.Addr) (
+		result models.PublicIP, err error)
+}
+
+type Provider string
+
+const (
+	IPInfo Provider = "ipinfo"
+)
+
+func New(provider Provider, client *http.Client, token string) ( //nolint:ireturn
+	a API, err error) {
+	switch provider {
+	case IPInfo:
+		return newIPInfo(client, token), nil
+	default:
+		panic("provider not valid: " + provider)
+	}
+}
+
+var (
+	ErrProviderNotValid = errors.New("API name is not valid")
+)
+
+func ParseProvider(s string) (provider Provider, err error) {
+	switch strings.ToLower(s) {
+	case "ipinfo":
+		return IPInfo, nil
+	default:
+		return "", fmt.Errorf(`%w: %q can only be "ipinfo" or "ip2location"`,
+			ErrProviderNotValid, s)
+	}
+}