Issue #42: implement Go client session values errors and CLI

clients/go/mxgateway/auth.go

@@ -0,0 +1,30 @@
+package mxgateway
+
+import (
+	"context"
+
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/metadata"
+)
+
+const authorizationHeader = "authorization"
+
+func unaryAuthInterceptor(apiKey string) grpc.UnaryClientInterceptor {
+	return func(ctx context.Context, method string, req, reply any, cc *grpc.ClientConn, invoker grpc.UnaryInvoker, opts ...grpc.CallOption) error {
+		return invoker(authContext(ctx, apiKey), method, req, reply, cc, opts...)
+	}
+}
+
+func streamAuthInterceptor(apiKey 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) {
+		return streamer(authContext(ctx, apiKey), desc, cc, method, opts...)
+	}
+}
+
+func authContext(ctx context.Context, apiKey string) context.Context {
+	if apiKey == "" {
+		return ctx
+	}
+
+	return metadata.AppendToOutgoingContext(ctx, authorizationHeader, "Bearer "+apiKey)
+}