Allow override of domains and whitelist in rules (#169)

Co-authored-by: Mathieu Cantin <mcantin@petalmd.com>
Co-authored-by: Pete Shaw <lozlow@users.noreply.github.com>

internal/config.go

@@ -210,6 +210,14 @@ func (c *Config) parseUnknownFlag(option string, arg flags.SplitArgument, args [
 			rule.Rule = val
 		case "provider":
 			rule.Provider = val
+		case "whitelist":
+			list := CommaSeparatedList{}
+			list.UnmarshalFlag(val)
+			rule.Whitelist = list
+		case "domains":
+			list := CommaSeparatedList{}
+			list.UnmarshalFlag(val)
+			rule.Domains = list
 		default:
 			return args, fmt.Errorf("invalid route param: %v", option)
 		}
@@ -327,9 +335,11 @@ func (c *Config) setupProvider(name string) error {
 
 // Rule holds defined rules
 type Rule struct {
-	Action   string
-	Rule     string
-	Provider string
+	Action    string
+	Rule      string
+	Provider  string
+	Whitelist CommaSeparatedList
+	Domains   CommaSeparatedList
 }
 
 // NewRule creates a new rule object