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package main
import (
"context"
"fmt"
"io"
"log"
"net/http"
"os"
"time"
"github.com/spiffe/go-spiffe/v2/spiffeid"
"github.com/spiffe/go-spiffe/v2/spiffetls/tlsconfig"
"github.com/spiffe/go-spiffe/v2/svid/jwtsvid"
"github.com/spiffe/go-spiffe/v2/workloadapi"
)
const (
serverURL = "https://localhost:8443"
socketPath = "unix:///tmp/agent.sock"
)
func main() {
if err := run(context.Background()); err != nil {
log.Fatal(err)
}
}
func run(ctx context.Context) error {
// Set a timeout to prevent the request from hanging if this workload is not properly registered in SPIRE.
ctx, cancel := context.WithTimeout(ctx, 30*time.Second)
defer cancel()
clientOptions := workloadapi.WithClientOptions(workloadapi.WithAddr(socketPath))
// Create an X509Source struct to fetch the trust bundle as needed to verify the X509-SVID presented by the server.
x509Source, err := workloadapi.NewX509Source(ctx, clientOptions)
if err != nil {
return fmt.Errorf("unable to create X509Source: %w", err)
}
defer x509Source.Close()
serverID := spiffeid.RequireFromString("spiffe://example.org/server")
// By default, this example uses the server's SPIFFE ID as the audience.
// It doesn't have to be a SPIFFE ID as long as it follows the JWT-SVID guidelines (https://github.com/spiffe/spiffe/blob/main/standards/JWT-SVID.md#32-audience)
audience := serverID.String()
args := os.Args
if len(args) >= 2 {
audience = args[1]
}
// Create a JWTSource to fetch JWT-SVIDs
jwtSource, err := workloadapi.NewJWTSource(ctx, clientOptions)
if err != nil {
return fmt.Errorf("unable to create JWTSource: %w", err)
}
defer jwtSource.Close()
// Fetch a JWT-SVID and set the `Authorization` header.
// Alternatively, it is possible to fetch the JWT-SVID using `workloadapi.FetchJWTSVID`.
svid, err := jwtSource.FetchJWTSVID(ctx, jwtsvid.Params{
Audience: audience,
})
if err != nil {
return fmt.Errorf("unable to fetch SVID: %w", err)
}
req, err := http.NewRequest("GET", serverURL, nil)
if err != nil {
return fmt.Errorf("unable to create request: %w", err)
}
req.Header.Set("Authorization", fmt.Sprintf("Bearer %s", svid.Marshal()))
client := &http.Client{
Transport: &http.Transport{
TLSClientConfig: tlsconfig.TLSClientConfig(
x509Source,
tlsconfig.AuthorizeID(serverID),
),
},
}
res, err := client.Do(req)
if err != nil {
return fmt.Errorf("unable to connect to %q: %w", serverURL, err)
}
defer res.Body.Close()
if res.StatusCode != http.StatusOK {
return fmt.Errorf("unexpected status: %d", res.StatusCode)
}
body, err := io.ReadAll(res.Body)
if err != nil {
return fmt.Errorf("error reading response body: %w", err)
}
log.Printf("%s", body)
return nil
}
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