Function expandEnv

core/openapi/loader.go:137–142

expandEnv replaces ${VAR} placeholders with their environment values. Missing variables expand to empty string — we don't fail the whole load on a single missing credential because operations without credentials should still appear in the registry (they'll just fail at call time).

(s string)

// on a single missing credential because operations without credentials
// should still appear in the registry (they'll just fail at call time).
func expandEnv(s string) string {
	return envVarPattern.ReplaceAllStringFunc(s, func(match string) string {
		name := match[2 : len(match)-1]
		return os.Getenv(name)
	})
}

// canonicaliseOpKeys rewrites user-supplied Joins/Operations map keys
// to match the spec's actual operationId casing. Viper lowercases all