oidc: Fix the way we call UserInfo

The UserInfo endpoint is called with an OAuth2 access token. The access
token expires after a while and then we must renew it with the refresh
token. Update the code so that it takes care of renewing the access
token.

Closes #32
Github-PR: #31

Signed-off-by: Yannis Zarkadas <[email protected]>

server.go

@@ -90,7 +90,7 @@ func (s *server) authenticate(w http.ResponseWriter, r *http.Request) {
 			// Check if the OAuth token has expired and if it has, delete the
 			// user's session
 			var reqErr *requestError
-			if errors.As(err, reqErr) && reqErr.StatusCode == http.StatusUnauthorized {
+			if errors.As(err, &reqErr) && reqErr.StatusCode == http.StatusUnauthorized {
 				logger.Warn("UserInfo token has expired")
 				session.Options.MaxAge = -1
 				if err := sessions.Save(r, w); err != nil {
@@ -187,7 +187,7 @@ func (s *server) callback(w http.ResponseWriter, r *http.Request) {
 
 	// UserInfo endpoint to get claims
 	claims := map[string]interface{}{}
-	userInfo, err := GetUserInfo(ctx, s.provider, oauth2.StaticTokenSource(oauth2Tokens))
+	userInfo, err := GetUserInfo(ctx, s.provider, s.oauth2Config.TokenSource(ctx, oauth2Tokens))
 	if err != nil {
 		logger.Errorf("Not able to fetch userinfo: %v", err)
 		returnMessage(w, http.StatusInternalServerError, "Not able to fetch userinfo.")