Fix nil pointer exception in webfinger

Co-authoredjby: Jörn Dreyer <jdreyer@owncloud.com>
Signed-off-by: Christian Richter <crichter@owncloud.com>

ocis-pkg/middleware/oidc.go

@@ -39,7 +39,7 @@ func OidcAuth(opts ...Option) func(http.Handler) http.Handler {
 		// it will fetch the keys from the issuer using the .well-known
 		// endpoint
 		return goidc.NewProvider(
-			context.WithValue(context.Background(), oauth2.HTTPClient, http.Client{}),
+			context.WithValue(context.Background(), oauth2.HTTPClient, &opt.HttpClient),
 			opt.OidcIssuer,
 		)
 	}
@@ -65,7 +65,7 @@ func OidcAuth(opts ...Option) func(http.Handler) http.Handler {
 				}
 
 				userInfo, err := provider.UserInfo(
-					context.WithValue(ctx, oauth2.HTTPClient, http.Client{}),
+					context.WithValue(ctx, oauth2.HTTPClient, &opt.HttpClient),
 					oauth2.StaticTokenSource(oauth2Token),
 				)
 				if err != nil {

ocis-pkg/middleware/options.go

@@ -1,6 +1,8 @@
 package middleware
 
 import (
+	"net/http"
+
 	gatewayv1beta1 "github.com/cs3org/go-cs3apis/cs3/gateway/v1beta1"
 	"github.com/owncloud/ocis/v2/ocis-pkg/log"
 )
@@ -16,6 +18,8 @@ type Options struct {
 	OidcIssuer string
 	// GatewayAPIClient is a reva gateway client
 	GatewayAPIClient gatewayv1beta1.GatewayAPIClient
+	// HttpClient is a http client
+	HttpClient http.Client
 }
 
 // WithLogger provides a function to set the openid connect issuer option.
@@ -38,3 +42,10 @@ func WithGatewayAPIClient(val gatewayv1beta1.GatewayAPIClient) Option {
 		o.GatewayAPIClient = val
 	}
 }
+
+// HttpClient provides a function to set the http client option.
+func WithHttpClient(val http.Client) Option {
+	return func(o *Options) {
+		o.HttpClient = val
+	}
+}