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January 11, 2024 17:05
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Verify Google Sign-in token in Golang
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package main | |
import ( | |
"context" | |
"fmt" | |
"google.golang.org/api/idtoken" | |
"log" | |
"net/http" | |
) | |
func main() { | |
http.HandleFunc("/", handleMain) | |
http.HandleFunc("/tokenSignIn", handleTokenSignIn) | |
fmt.Println("Server started at http://localhost:8080") | |
http.ListenAndServe(":8080", nil) | |
} | |
func handleMain(w http.ResponseWriter, r *http.Request) { | |
http.ServeFile(w, r, "index.html") | |
} | |
// Verify Google ID token: https://developers.google.com/identity/gsi/web/guides/verify-google-id-token | |
func handleTokenSignIn(_ http.ResponseWriter, r *http.Request) { | |
// parse POST form | |
if err := r.ParseForm(); err != nil { | |
log.Fatalln(err) | |
} | |
// verify CSRF tokens | |
const csrfCookieKey = "g_csrf_token" | |
cookieToken, err := r.Cookie(csrfCookieKey) | |
if err != nil { | |
log.Fatalf("failed to retrieve %s from cookie: %s", csrfCookieKey, err) | |
} | |
formCookie := r.PostForm.Get(csrfCookieKey) | |
if formCookie == "" { | |
log.Fatalf("no %s in POST form", csrfCookieKey) | |
} | |
if cookieToken.Value != formCookie { | |
log.Fatalln("failed to verify double submit cookie") | |
} | |
// validate Google token using their library | |
payload, err := idtoken.Validate(context.Background(), r.PostForm.Get("credential"), googleClientId) | |
if err != nil { | |
log.Fatalln(err) | |
} | |
fmt.Print(payload.Claims) | |
} |
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