Handle failed status code in provider requests (#313)

api/provider/provider.go

@@ -3,6 +3,8 @@ package provider
 import (
 	"context"
 	"encoding/json"
+	"fmt"
+	"io/ioutil"
 
 	"golang.org/x/oauth2"
 )
@@ -49,6 +51,15 @@ func chooseHost(base, defaultHost string) string {
 	return base
 }
 
+type RequestError struct {
+	code int
+	body string
+}
+
+func (r *RequestError) Error() string {
+	return fmt.Sprintf("Request failed with status %d:\n%s", r.code, r.body)
+}
+
 func makeRequest(ctx context.Context, tok *oauth2.Token, g *oauth2.Config, url string, dst interface{}) error {
 	client := g.Client(ctx, tok)
 	res, err := client.Get(url)
@@ -57,6 +68,14 @@ func makeRequest(ctx context.Context, tok *oauth2.Token, g *oauth2.Config, url s
 	}
 	defer res.Body.Close()
 
+	if res.StatusCode/100 != 2 {
+		body, err := ioutil.ReadAll(res.Body)
+		if err != nil {
+			return err
+		}
+		return &RequestError{code: res.StatusCode, body: string(body)}
+	}
+
 	if err := json.NewDecoder(res.Body).Decode(dst); err != nil {
 		return err
 	}

api/provider/provider_test.go

@@ -0,0 +1,44 @@
+package provider_test
+
+import (
+	"context"
+	"fmt"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+	"time"
+
+	"github.com/netlify/gotrue/api/provider"
+	"github.com/netlify/gotrue/conf"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	"golang.org/x/oauth2"
+)
+
+func TestGithubFail(t *testing.T) {
+	ctx, cancel := context.WithCancel(context.Background())
+	t.Cleanup(cancel)
+
+	srv := httptest.NewServer(http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
+		rw.WriteHeader(http.StatusTeapot)
+		fmt.Fprint(rw, "Something failed")
+	}))
+	t.Cleanup(srv.Close)
+
+	gh, err := provider.NewGithubProvider(conf.OAuthProviderConfiguration{
+		ClientID:    "client-id",
+		Secret:      "secret",
+		RedirectURI: "https://redirect.example.org/callback",
+		URL:         srv.URL,
+		Enabled:     true,
+	})
+	require.NoError(t, err)
+
+	user, err := gh.GetUserData(ctx, &oauth2.Token{
+		AccessToken: "my-token",
+		Expiry:      time.Now().Add(time.Minute),
+	})
+	require.Error(t, err)
+	require.Nil(t, user)
+	assert.Equal(t, "Request failed with status 418:\nSomething failed", err.Error())
+}