Policy language

This page provides an overview of how to author policies using our policy language. To begin, we'll need to get familiar with the language's grammar, keywords, and types.

Grammar

The grammar has been designed for flexibility and expressiveness. We currently support the following operations:

Operation	Operators	Example	Types
logical	&&, ||	"true && false"	(bool, bool) -> bool
comparison	==, !=, <, >, <=, >=	"1 < 2"	(int, int) -> bool
comparison	==, !=	"'a' != 'b'"	(string, string) -> bool
comparison	in	"1 in [1, 2, 3]"	(T, list<T>) -> bool
access	x[<index>]	[1,2,3][0]	(list<T>) -> T
access	x[<index>]	"'abc'[0]"	(string) -> string
access	x[<start>..<end>]	[1,2,3][0..2]	(list<T>) -> (list<T>)
access	x[<start>..<end>]	"'abc'[0..2]"	(string) -> string
access	x.<field>	"user.tags"	(struct) -> T
function	x.all(item, <predicate>)	"[1,1,1].all(x, x == 1)"	(list<T>) -> bool
function	x.any(item, <predicate>)	"[1,2,3].any(x, x == 1)"	(list<T>) -> bool
function	x.contains(<value>)	"[1,2,3].contains(1)"	(list<T>) -> bool
function	x.count()	"[1,2,3].count()"	(list<T>) -> int
function	x.filter(item, <predicate>)	"[1,2,3].filter(x, x == 1)"	(list<T>) -> (list<T>)

Keywords

Keywords are reserved words that are dynamically interchanged for real values at evaluation time. Each field supports a different set of keywords.

Consensus

Keyword	Type	Description
approvers	list<User>	The users that have approved an activity

Condition

Keyword	Type	Description
activity	Activity	The activity metadata of the request
eth.tx	EthereumTransaction	The parsed Ethereum transaction payload
wallet	Wallet	The target wallet used in sign requests
private_key	PrivateKey	The target private key used in sign requests

Types

The language is strongly typed which makes policies easy to author and maintain.

Primitive

Type	Example	Notes
bool	true
int	256	i64
string	'a'	only single quotes are supported
list<T>	[1, 2, 3]	a list of type T
struct	{ id: 'abc' }	a key-value map of { field:T } (defined below)

Struct

Struct	Field	Type	Description
User	id	string	The identifier of the user
	tags	list<string>	The collection of tags for the user
	email	string	The email address of the user
	alias	string	The alias of the user
Activity	type	string	The type of the activity (e.g. ACTIVITY_TYPE_SIGN_TRANSACTION_V2)
	resource	string	The resource type the activity targets (e.g. USER, PRIVATE_KEY, POLICY, etc)
	action	string	The action of the activity (e.g. CREATE, UPDATE, DELETE, SIGN, etc)
Wallet	id	string	The identifier of the wallet
PrivateKey	id	string	The identifier of the private key
	tags	list<string>	The collection of tags for the private key
EthereumTransaction	from	string	The sender address of the transaction
	to	string	The receiver address of the transaction
	data	string	The arbitrary data of the transaction (hex-encoded)
	value	int	The amount being sent (in wei)
	gas	int	The maximum allowed gas for the transaction
	gas_price	int	The price of gas for the transaction
	chain_id	int	The chain identifier for the transaction

Activity Breakdown

Resource Type	Action	Activity Type
ORGANIZATION	CREATE	ACTIVITY_TYPE_CREATE_SUB_ORGANIZATION_V4
INVITATION	CREATE	ACTIVITY_TYPE_CREATE_INVITATIONS
	DELETE	ACTIVITY_TYPE_DELETE_INVITATION
POLICY	CREATE	ACTIVITY_TYPE_CREATE_POLICY_V3
	UPDATE	ACTIVITY_TYPE_UPDATE_POLICY
	DELETE	ACTIVITY_TYPE_DELETE_POLICY
WALLET	CREATE	ACTIVITY_TYPE_CREATE_WALLET
	CREATE	ACTIVITY_TYPE_CREATE_WALLET_ACCOUNTS
	EXPORT	ACTIVITY_TYPE_EXPORT_WALLET
PRIVATE_KEY	CREATE	ACTIVITY_TYPE_CREATE_PRIVATE_KEYS_V2
	CREATE	ACTIVITY_TYPE_CREATE_PRIVATE_KEY_TAG
	UPDATE	ACTIVITY_TYPE_UPDATE_PRIVATE_KEY_TAG
	DELETE	ACTIVITY_TYPE_DISABLE_PRIVATE_KEY
	DELETE	ACTIVITY_TYPE_DELETE_PRIVATE_KEY_TAGS
	EXPORT	ACTIVITY_TYPE_EXPORT_PRIVATE_KEY
	SIGN	ACTIVITY_TYPE_SIGN_RAW_PAYLOAD_V2
	SIGN	ACTIVITY_TYPE_SIGN_TRANSACTION_V2
USER	CREATE	ACTIVITY_TYPE_CREATE_USERS_V2
	CREATE	ACTIVITY_TYPE_CREATE_USER_TAG
	UPDATE	ACTIVITY_TYPE_UPDATE_USER
	UPDATE	ACTIVITY_TYPE_UPDATE_USER_TAG
	DELETE	ACTIVITY_TYPE_DELETE_USERS
	DELETE	ACTIVITY_TYPE_DELETE_USER_TAG
CREDENTIAL	CREATE	ACTIVITY_TYPE_CREATE_API_KEYS
	CREATE	ACTIVITY_TYPE_CREATE_AUTHENTICATORS_V2
	DELETE	ACTIVITY_TYPE_DELETE_API_KEYS
	DELETE	ACTIVITY_TYPE_DELETE_AUTHENTICATORS
CONFIG	UPDATE	ACTIVITY_TYPE_UPDATE_ALLOWED_ORIGINS
RECOVERY	CREATE	ACTIVITY_TYPE_INIT_USER_EMAIL_RECOVERY