From 9095a51613032fc4f54e91b3c67c0a922d990bfb Mon Sep 17 00:00:00 2001
From: M Hickford <mirth.hickford@gmail.com>
Date: Fri, 22 Sep 2023 14:28:09 +0000
Subject: [PATCH] oauth2: clarify error if endpoint missing DeviceAuthURL

Change-Id: I36eb5eb66099161785160f4f39ea1c7f64ad6e74
GitHub-Last-Rev: 31cfe8150fa630b67b8e0a75d5ebb8890f979a6d
GitHub-Pull-Request: golang/oauth2#664
Reviewed-on: https://go-review.googlesource.com/c/oauth2/+/526302
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Bryan Mills <bcmills@google.com>
Reviewed-by: Bryan Mills <bcmills@google.com>
---
 deviceauth.go | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/deviceauth.go b/deviceauth.go
index f3ea99e..85ef796 100644
--- a/deviceauth.go
+++ b/deviceauth.go
@@ -3,6 +3,7 @@ package oauth2
 import (
 	"context"
 	"encoding/json"
+	"errors"
 	"fmt"
 	"io"
 	"net/http"
@@ -88,6 +89,10 @@ func (c *Config) DeviceAuth(ctx context.Context, opts ...AuthCodeOption) (*Devic
 }
 
 func retrieveDeviceAuth(ctx context.Context, c *Config, v url.Values) (*DeviceAuthResponse, error) {
+	if c.Endpoint.DeviceAuthURL == "" {
+		return nil, errors.New("endpoint missing DeviceAuthURL")
+	}
+
 	req, err := http.NewRequest("POST", c.Endpoint.DeviceAuthURL, strings.NewReader(v.Encode()))
 	if err != nil {
 		return nil, err