package main

import (
	"context"
	"fmt"
	"io"
	"log"
	"net/http"

	"github.com/spiffe/go-spiffe/v2/spiffeid"
	"github.com/spiffe/go-spiffe/v2/spiffetls/tlsconfig"
	"github.com/spiffe/go-spiffe/v2/workloadapi"
)

const (
	// Workload API socket path
	socketPath = "unix:///tmp/agent.sock"
	serverURL  = "https://localhost:8443/"
)

func main() {
	if err := run(context.Background()); err != nil {
		log.Fatal(err)
	}
}

func run(ctx context.Context) error {
	ctx, cancel := context.WithCancel(ctx)
	defer cancel()

	// Create a `workloadapi.X509Source`, it will connect to Workload API using provided socket path
	// If socket path is not defined using `workloadapi.SourceOption`, value from environment variable `SPIFFE_ENDPOINT_SOCKET` is used.
	source, err := workloadapi.NewX509Source(ctx, workloadapi.WithClientOptions(workloadapi.WithAddr(socketPath)))
	if err != nil {
		return fmt.Errorf("unable to create X509Source: %w", err)
	}
	defer source.Close()

	// Allowed SPIFFE ID
	serverID := spiffeid.RequireFromString("spiffe://example.org/server")

	// Create a `tls.Config` to allow mTLS connections, and verify that presented certificate has SPIFFE ID `spiffe://example.org/server`
	tlsConfig := tlsconfig.MTLSClientConfig(source, source, tlsconfig.AuthorizeID(serverID))
	client := &http.Client{
		Transport: &http.Transport{
			TLSClientConfig: tlsConfig,
		},
	}

	r, err := client.Get(serverURL)
	if err != nil {
		return fmt.Errorf("error connecting to %q: %w", serverURL, err)
	}

	defer r.Body.Close()
	body, err := io.ReadAll(r.Body)
	if err != nil {
		return fmt.Errorf("unable to read body: %w", err)
	}

	log.Printf("%s", body)
	return nil
}