feat: oauth email whitelist

internal/types/types.go

@@ -37,6 +37,7 @@ type Config struct {
 	GenericTokenURL     string `mapstructure:"generic-token-url"`
 	GenericUserURL      string `mapstructure:"generic-user-info-url"`
 	DisableContinue     bool   `mapstructure:"disable-continue"`
+	Whitelist           string `mapstructure:"whitelist"`
 }
 
 type UserContext struct {
@@ -78,3 +79,7 @@ type OAuthProviders struct {
 	Google    *oauth.OAuth
 	Microsoft *oauth.OAuth
 }
+
+type UnauthorizedQuery struct {
+	Email string `url:"email"`
+}