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/*
This is an example application to demonstrate querying the user info endpoint.
*/
package main
import (
"crypto/rand"
"encoding/base64"
"encoding/json"
"flag"
"io"
"log"
"net/http"
"time"
"github.com/coreos/go-oidc/v3/oidc"
"golang.org/x/net/context"
"golang.org/x/oauth2"
"within.website/x/internal"
)
var (
clientID = flag.String("oauth2-client-id", "", "OAuth2 client ID")
clientSecret = flag.String("oauth2-client-secret", "", "OAuth2 client secret")
idpURL = flag.String("oauth2-idp-url", "https://idp.xeserv.us", "OAuth2 IDP URL")
redirectURL = flag.String("oauth2-redirect-url", "http://127.0.0.1:5556/auth/callback", "OAuth2 redirect URL")
)
func randString(nByte int) (string, error) {
b := make([]byte, nByte)
if _, err := io.ReadFull(rand.Reader, b); err != nil {
return "", err
}
return base64.RawURLEncoding.EncodeToString(b), nil
}
func setCallbackCookie(w http.ResponseWriter, r *http.Request, name, value string) {
c := &http.Cookie{
Name: name,
Value: value,
MaxAge: int(time.Hour.Seconds()),
Secure: r.TLS != nil,
HttpOnly: true,
}
http.SetCookie(w, c)
}
func main() {
internal.HandleStartup()
ctx := context.Background()
provider, err := oidc.NewProvider(ctx, *idpURL)
if err != nil {
log.Fatal(err)
}
verifier := provider.Verifier(&oidc.Config{ClientID: *clientID})
config := oauth2.Config{
ClientID: *clientID,
ClientSecret: *clientSecret,
Endpoint: provider.Endpoint(),
RedirectURL: *redirectURL,
Scopes: []string{oidc.ScopeOpenID, "profile", "email", "groups"},
}
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
state, err := randString(16)
if err != nil {
http.Error(w, "Internal error", http.StatusInternalServerError)
return
}
setCallbackCookie(w, r, "state", state)
http.Redirect(w, r, config.AuthCodeURL(state), http.StatusFound)
})
http.HandleFunc("/auth/callback", func(w http.ResponseWriter, r *http.Request) {
state, err := r.Cookie("state")
if err != nil {
http.Error(w, "state not found", http.StatusBadRequest)
return
}
if r.URL.Query().Get("state") != state.Value {
http.Error(w, "state did not match", http.StatusBadRequest)
return
}
oauth2Token, err := config.Exchange(ctx, r.URL.Query().Get("code"))
if err != nil {
http.Error(w, "Failed to exchange token: "+err.Error(), http.StatusInternalServerError)
return
}
var extraClaims any = nil
rawIDToken, ok := oauth2Token.Extra("id_token").(string)
if ok {
idToken, err := verifier.Verify(ctx, rawIDToken)
if err != nil {
http.Error(w, "Failed to verify id_token: "+err.Error(), http.StatusInternalServerError)
return
}
var claims struct {
Subject string `json:"sub"`
Email string `json:"email"`
Verified bool `json:"email_verified"`
Name string `json:"name"`
PreferredUsername string `json:"preferred_username"`
Groups []string `json:"groups"`
Picture string `json:"picture"`
}
if err := idToken.Claims(&claims); err != nil {
http.Error(w, "Failed to unmarshal token claims: "+err.Error(), http.StatusInternalServerError)
}
extraClaims = claims
}
userInfo, err := provider.UserInfo(ctx, oauth2.StaticTokenSource(oauth2Token))
if err != nil {
http.Error(w, "Failed to get userinfo: "+err.Error(), http.StatusInternalServerError)
return
}
resp := struct {
OAuth2Token *oauth2.Token
UserInfo *oidc.UserInfo
ExtraClaims any
}{oauth2Token, userInfo, extraClaims}
data, err := json.MarshalIndent(resp, "", " ")
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
w.Header().Add("Content-Type", "application/json")
w.Write(data)
})
log.Printf("listening on http://%s/", "127.0.0.1:5556")
log.Fatal(http.ListenAndServe("127.0.0.1:5556", nil))
}
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