nucypher.policy

Subpackages

Submodules

class PolicyMessageKit(policy_encrypting_key: umbral.PublicKey, threshold: int, result: nucypher.policy.kits.RetrievalResult, message_kit: nucypher_core.MessageKit)

Bases: object

classmethod from_message_kit(message_kit: nucypher_core.MessageKit, policy_encrypting_key: umbral.PublicKey, threshold: int) → nucypher.policy.kits.PolicyMessageKit
as_retrieval_kit() → nucypher_core.RetrievalKit
decrypt(sk: umbral.SecretKey) → bytes
is_decryptable_by_receiver() → bool
with_result(result: nucypher.policy.kits.RetrievalResult) → nucypher.policy.kits.PolicyMessageKit
property conditions
class RetrievalResult(cfrags: Dict[NewType.<locals>.new_type, umbral.VerifiedCapsuleFrag])

Bases: object

An object representing retrieval results for a single capsule.

classmethod empty()
canonical_addresses() → Set[nucypher_core.Address]
with_result(result: nucypher.policy.kits.RetrievalResult) → nucypher.policy.kits.RetrievalResult

Joins two RetrievalResult objects.

If both objects contain cfrags from the same Ursula, the one from result will be kept.

class PaymentMethod

Bases: abc.ABC

Extends ReencryptionPrerequisite to facilitate policy payment and payment verification.

class Quote(rate, value, commencement, expiration, duration, shares)

Bases: tuple

property rate

Alias for field number 0

property value

Alias for field number 1

property commencement

Alias for field number 2

property expiration

Alias for field number 3

property duration

Alias for field number 4

property shares

Alias for field number 5

abstract pay(policy: nucypher.policy.policies.Policy) → Dict

Carry out payment for the given policy.

abstract property rate

The cost of this payment method per unit.

abstract quote(shares: int, duration: Optional[int] = None, commencement: Optional[NewType.<locals>.new_type] = None, expiration: Optional[int] = None, value: Optional[int] = None, rate: Optional[int] = None) → nucypher.policy.payment.PaymentMethod.Quote

Generates a valid quote for this payment method using pricing details.

abstract validate_price(shares: int, value: int, duration: int) → None
class ContractPayment(eth_provider: str, network: str, registry: Optional[nucypher.blockchain.eth.registry.BaseContractRegistry] = None, *args, **kwargs)

Bases: nucypher.policy.payment.PaymentMethod, abc.ABC

Baseclass for on-chain policy payment; Requires a blockchain connection.

ONCHAIN = True
class Quote

Bases: nucypher.policy.payment.PaymentMethod.Quote

property agent

Returns an instance of the agent used to carry out contract payments.

class SubscriptionManagerPayment(eth_provider: str, network: str, registry: Optional[nucypher.blockchain.eth.registry.BaseContractRegistry] = None, *args, **kwargs)

Bases: nucypher.policy.payment.ContractPayment

Handle policy payment using the SubscriptionManager contract.

NAME = 'SubscriptionManager'
verify(payee: NewType.<locals>.new_type, request: nucypher_core.ReencryptionRequest) → bool

Verify policy payment by reading the SubscriptionManager contract

pay(policy: nucypher.policy.policies.Policy) → web3.types.TxReceipt

Writes a new policy to the SubscriptionManager contract.

property rate

The cost of this payment method per unit.

quote(shares: int, commencement: Optional[NewType.<locals>.new_type] = None, expiration: Optional[NewType.<locals>.new_type] = None, duration: Optional[int] = None, value: Optional[NewType.<locals>.new_type] = None, rate: Optional[NewType.<locals>.new_type] = None, *args, **kwargs) → nucypher.policy.payment.PaymentMethod.Quote

A quote for the SubscriptionManager is calculated as rate * duration seconds

validate_price(value: NewType.<locals>.new_type, duration: NewType.<locals>.new_type, shares: int, *args, **kwargs) → bool
class FreeReencryptions

Bases: nucypher.policy.payment.PaymentMethod

Useful for testing.

ONCHAIN = False
NAME = 'Free'
verify(payee: NewType.<locals>.new_type, request: nucypher_core.ReencryptionRequest) → bool
pay(policy: nucypher.policy.policies.Policy) → Dict

Carry out payment for the given policy.

property rate

The cost of this payment method per unit.

quote(shares: int, commencement: Optional[NewType.<locals>.new_type] = None, expiration: Optional[NewType.<locals>.new_type] = None, duration: Optional[int] = None, *args, **kwargs) → nucypher.policy.payment.PaymentMethod.Quote

Generates a valid quote for this payment method using pricing details.

validate_price(*args, **kwargs) → bool
class Policy(publisher: Alice, label: bytes, bob: Bob, kfrags: Sequence[umbral.VerifiedKeyFrag], public_key: umbral.PublicKey, threshold: int, expiration: maya.core.MayaDT, commencement: maya.core.MayaDT, value: int, rate: int, duration: int, payment_method: PaymentMethod)

Bases: object

An edict by Alice, arranged with n Ursulas, to perform re-encryption for a specific Bob.

log

Drop-in replacement of Twisted’s Logger, patching the emit() method to tolerate inputs with curly braces, i.e., not compliant with PEP 3101.

See Issue #724 and, particularly, https://github.com/nucypher/nucypher/issues/724#issuecomment-600190455

exception PolicyException

Bases: Exception

Base exception for policy exceptions

exception NotEnoughUrsulas

Bases: nucypher.policy.policies.Policy.PolicyException

Raised when a Policy cannot be generated due an insufficient number of available qualified network nodes.

enact(network_middleware: nucypher.network.middleware.RestMiddleware, ursulas: Optional[Iterable[Ursula]] = None) → EnactedPolicy

Attempts to enact the policy, returns an EnactedPolicy object on success.

class EnactedPolicy(hrac: nucypher_core.HRAC, label: bytes, public_key: umbral.PublicKey, threshold: int, treasure_map: EncryptedTreasureMap, revocation_kit: nucypher.policy.revocation.RevocationKit, publisher_verifying_key: umbral.PublicKey)

Bases: object

make_staking_provider_reservoir(application_agent: nucypher.blockchain.eth.agents.PREApplicationAgent, exclude_addresses: Optional[Iterable[NewType.<locals>.new_type]] = None, include_addresses: Optional[Iterable[NewType.<locals>.new_type]] = None, pagination_size: Optional[int] = None)

Get a sampler object containing the currently registered staking providers.

class MergedReservoir(values: Iterable, reservoir: nucypher.blockchain.eth.agents.StakingProvidersReservoir)

Bases: object

A reservoir made of a list of addresses and a StakingProviderReservoir. Draws the values from the list first, then from StakingProviderReservoir, then returns None on subsequent calls.

class PrefetchStrategy(reservoir: nucypher.policy.reservoir.MergedReservoir, need_successes: int)

Bases: object

Encapsulates the batch draw strategy from a reservoir. Determines how many values to draw based on the number of values that have already led to successes.

class RevocationKit(treasure_map, signer: nucypher.crypto.signing.SignatureStamp)

Bases: object

property revokable_addresses

Returns a Set of revokable addresses in the checksum address formatting

add_confirmation(ursula_address, signed_receipt)

Adds a signed confirmation of Ursula’s ability to revoke the node.