chore(lib/policy): move Checker to its own package to avoid import cycles

Signed-off-by: Xe Iaso <me@xeiaso.net>

internal/thoth/geoipchecker_test.go

@@ -5,10 +5,10 @@ import (
 	"net/http/httptest"
 	"testing"
 
-	"github.com/TecharoHQ/anubis/lib/policy"
+	"github.com/TecharoHQ/anubis/lib/policy/checker"
 )
 
-var _ policy.Checker = &ASNChecker{}
+var _ checker.Impl = &ASNChecker{}
 
 func TestGeoIPChecker(t *testing.T) {
 	cli := loadSecrets(t)

internal/thoth/thoth.go

@@ -8,7 +8,7 @@ import (
 	"time"
 
 	"github.com/TecharoHQ/anubis/internal"
-	"github.com/TecharoHQ/anubis/lib/policy"
+	"github.com/TecharoHQ/anubis/lib/policy/checker"
 	iptoasnv1 "github.com/TecharoHQ/thoth-proto/gen/techaro/thoth/iptoasn/v1"
 	grpcprom "github.com/grpc-ecosystem/go-grpc-middleware/providers/prometheus"
 	"github.com/grpc-ecosystem/go-grpc-middleware/v2/interceptors/timeout"
@@ -74,7 +74,7 @@ func (c *Client) Close() error {
 	return c.conn.Close()
 }
 
-func (c *Client) ASNCheckerFor(asns []uint32) policy.Checker {
+func (c *Client) ASNCheckerFor(asns []uint32) checker.Impl {
 	asnMap := map[uint32]struct{}{}
 	var sb strings.Builder
 	fmt.Fprintln(&sb, "ASNChecker")
@@ -89,3 +89,19 @@ func (c *Client) ASNCheckerFor(asns []uint32) policy.Checker {
 		hash:    internal.SHA256sum(sb.String()),
 	}
 }
+
+func (c *Client) GeoIPCheckerFor(countries []string) checker.Impl {
+	countryMap := map[string]struct{}{}
+	var sb strings.Builder
+	fmt.Fprintln(&sb, "GeoIPChecker")
+	for _, cc := range countries {
+		countryMap[cc] = struct{}{}
+		fmt.Fprintln(&sb, cc)
+	}
+
+	return &GeoIPChecker{
+		iptoasn:   c.iptoasn,
+		countries: countryMap,
+		hash:      sb.String(),
+	}
+}