feat(internal): add Thoth client and simple ASN checker

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

internal/thoth/auth.go

@@ -0,0 +1,39 @@
+package thoth
+
+import (
+	"context"
+
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/metadata"
+)
+
+func authUnaryClientInterceptor(token string) grpc.UnaryClientInterceptor {
+	return func(
+		ctx context.Context,
+		method string,
+		req interface{},
+		reply interface{},
+		cc *grpc.ClientConn,
+		invoker grpc.UnaryInvoker,
+		opts ...grpc.CallOption,
+	) error {
+		md := metadata.Pairs("authorization", "Bearer "+token)
+		ctx = metadata.NewOutgoingContext(ctx, md)
+		return invoker(ctx, method, req, reply, cc, opts...)
+	}
+}
+
+func authStreamClientInterceptor(token string) grpc.StreamClientInterceptor {
+	return func(
+		ctx context.Context,
+		desc *grpc.StreamDesc,
+		cc *grpc.ClientConn,
+		method string,
+		streamer grpc.Streamer,
+		opts ...grpc.CallOption,
+	) (grpc.ClientStream, error) {
+		md := metadata.Pairs("authorization", "Bearer "+token)
+		ctx = metadata.NewOutgoingContext(ctx, md)
+		return streamer(ctx, desc, cc, method, opts...)
+	}
+}