package acl

const (
	WildcardName = "*"

	// AnonymousTokenID is the AccessorID of the anonymous token.
	// When logging or displaying to users, use acl.AliasIfAnonymousToken
	// to convert this to AnonymousTokenAlias.
	AnonymousTokenID     = "00000000-0000-0000-0000-000000000002"
	AnonymousTokenAlias  = "anonymous token"
	AnonymousTokenSecret = "anonymous"

	ReservedBuiltinPrefix = "builtin/"
)

// Config encapsulates all of the generic configuration parameters used for
// policy parsing and enforcement
type Config struct {
	// WildcardName is the string that represents a request to authorize a wildcard permission
	WildcardName string

	// embedded enterprise configuration
	EnterpriseConfig
}

type ExportFetcher interface {
	// ExportsForPartition returns the config entry defining exports for a partition
	ExportsForPartition(partition string) ExportedServices
}

type ExportedServices struct {
	// Data is a map of [namespace] -> [service] -> [list of partitions the service is exported to]
	// This includes both the names of typical service instances and their corresponding sidecar proxy
	// instance names. Meaning that if "web" is exported, "web-sidecar-proxy" instances will also be
	// shown as exported.
	Data map[string]map[string][]string
}

// GetWildcardName will retrieve the configured wildcard name or provide a default
// in the case that the config is Nil or the wildcard name is unset.
func (c *Config) GetWildcardName() string {
	if c == nil || c.WildcardName == "" {
		return WildcardName
	}
	return c.WildcardName
}

// Close will relinquish any resources this Config might be holding on to or
// managing.
func (c *Config) Close() {
	if c != nil {
		c.EnterpriseConfig.Close()
	}
}

// AliasIfAnonymousToken returns the string "anonymous token" if
// accessorID is acl.AnonymousTokenID. Used for better
// UX when logging the accessorID.
func AliasIfAnonymousToken(accessorID string) string {
	if accessorID == AnonymousTokenID {
		return AnonymousTokenAlias
	}
	return accessorID
}