feat: added API gateway

internal/gw/grpc_client/auth_client.go

@@ -0,0 +1,69 @@
+package grpc_client
+
+import (
+	"context"
+	"fmt"
+
+	pb "datarush/pkg/api/auth"
+
+	"google.golang.org/grpc"
+)
+
+type AuthClient struct {
+	client pb.AuthServiceClient
+	conn   *grpc.ClientConn
+}
+
+func NewAuthClient(ctx context.Context, address string, factory *ClientFactory) (*AuthClient, error) {
+	conn, err := factory.GetConnection(ctx, address)
+	if err != nil {
+		return nil, fmt.Errorf("failed to create auth client: %w", err)
+	}
+
+	return &AuthClient{
+		client: pb.NewAuthServiceClient(conn),
+		conn:   conn,
+	}, nil
+}
+
+func (c *AuthClient) SignUp(ctx context.Context, email, username, password string) (string, error) {
+	req := &pb.SignUpRequest{
+		Email:    email,
+		Username: username,
+		Password: password,
+	}
+
+	resp, err := c.client.SignUp(ctx, req)
+	if err != nil {
+		return "", fmt.Errorf("sign up failed: %w", err)
+	}
+
+	return resp.Token, nil
+}
+
+func (c *AuthClient) SignIn(ctx context.Context, email, password string) (string, error) {
+	req := &pb.SignInRequest{
+		Email:    email,
+		Password: password,
+	}
+
+	resp, err := c.client.SignIn(ctx, req)
+	if err != nil {
+		return "", fmt.Errorf("sign in failed: %w", err)
+	}
+
+	return resp.Token, nil
+}
+
+func (c *AuthClient) ValidateToken(ctx context.Context, token string) (string, error) {
+	req := &pb.ValidateTokenRequest{
+		Token: token,
+	}
+
+	resp, err := c.client.ValidateToken(ctx, req)
+	if err != nil {
+		return "", fmt.Errorf("token validation failed: %w", err)
+	}
+
+	return resp.UserId, nil
+}