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Implemented callback as default_app_data. Added docstrings to Destination.

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Mark Qvist 2021-05-16 15:58:06 +02:00
parent 27dbde1981
commit fe773c32e2
1 changed files with 116 additions and 7 deletions
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123
RNS/Destination.py
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@ -16,6 +16,21 @@ class Callbacks:
self.proof_requested = None
class Destination:
"""
A class used to describe endpoints in a Reticulum Network. Destination
instances are used both to create outgoing and incoming endpoints. The
destination type will decide if encryption, and what type, is used in
communication with the endpoint. A destination can also announce its
presence on the network, which will also distribute necessary keys for
encrypted communication with it.
:param identity: An instance of :ref:`RNS.Identity<Identity>`. Can hold only public keys for an outgoing destination, or holding private keys for an ingoing.
:param direction: ``RNS.Destination.IN`` or ``RNS.Destination.OUT``
:param type: ``RNS.Destination.SINGLE``, ``RNS.Destination.GROUP`` or ``RNS.Destination.PLAIN``.
:param app_name: A string specifying the app name.
:param \*aspects: Any non-zero number of string arguments.
"""
KEYSIZE = RNS.Identity.KEYSIZE;
PADDINGSIZE= RNS.Identity.PADDINGSIZE;
@ -37,6 +52,10 @@ class Destination:
@staticmethod
def full_name(app_name, *aspects):
"""
:returns: A string containing the full human-readable name of the destination, for an app_name and a number of aspects.
"""
# Check input values and build name string
if "." in app_name: raise ValueError("Dots can't be used in app names")
@ -50,6 +69,9 @@ class Destination:
@staticmethod
def hash(app_name, *aspects):
"""
:returns: A destination name in adressable hash form, for an app_name and a number of aspects.
"""
name = Destination.full_name(app_name, *aspects)
# Create a digest for the destination
@ -60,11 +82,17 @@ class Destination:
@staticmethod
def app_and_aspects_from_name(full_name):
"""
:returns: A tuple containing the app name and a list of aspects, for a full-name string.
"""
components = full_name.split(".")
return (components[0], components[1:])
@staticmethod
def hash_from_name_and_identity(full_name, identity):
"""
:returns: A destination name in adressable hash form, for a full name string and Identity instance.
"""
app_name, aspects = Destination.app_and_aspects_from_name(full_name)
aspects.append(identity.hexhash)
return Destination.hash(app_name, *aspects)
@ -103,19 +131,46 @@ class Destination:
def __str__(self):
"""
:returns: A human-readable representation of the destination including addressable hash and full name.
"""
return "<"+self.name+"/"+self.hexhash+">"
def link_established_callback(self, callback):
"""
Registers a function to be called when a link has been established to
this destination.
:param callback: A function or method to be called
"""
self.callbacks.link_established = callback
def packet_callback(self, callback):
"""
Registers a function to be called when a packet has been received by
this destination.
:param callback: A function or method to be called
"""
self.callbacks.packet = callback
def proof_requested_callback(self, callback):
"""
Registers a function to be called when a proof has been requested for
a packet sent to this destination. Allows control over when and if
proofs should be returned for received packets.
:param callback: A function or method to be called. The callback must return one of True or False. If the callback returns True, a proof will be sent. If it returns False, a proof will not be sent.
"""
self.callbacks.proof_requested = callback
def set_proof_strategy(self, proof_strategy):
"""
Sets the destinations proof strategy.
:param proof_strategy: One of ``RNS.Destination.PROVE_NONE``, ``RNS.Destination.PROVE_ALL`` or ``RNS.Destination.PROVE_APP``. If ``RNS.Destination.PROVE_APP`` is set, the `proof_requested_callback` will be called to determine whether a proof should be sent or not.
"""
if not proof_strategy in Destination.proof_strategies:
raise TypeError("Unsupported proof strategy")
else:
@ -136,7 +191,12 @@ class Destination:
if link != None:
self.links.append(link)
def createKeys(self):
def create_keys(self):
"""
For a ``RNS.Destination.GROUP`` type destination, creates a new symmetric key.
:raises: ``TypeError`` if called on an incompatible type of destination.
"""
if self.type == Destination.PLAIN:
raise TypeError("A plain destination does not hold any keys")
@ -148,7 +208,12 @@ class Destination:
self.prv = Fernet(self.prv_bytes)
def getPrivateKey(self):
def get_private_key(self):
"""
For a ``RNS.Destination.GROUP`` type destination, returns the symmetric private key.
:raises: ``TypeError`` if called on an incompatible type of destination.
"""
if self.type == Destination.PLAIN:
raise TypeError("A plain destination does not hold any keys")
elif self.type == Destination.SINGLE:
@ -157,7 +222,13 @@ class Destination:
return self.prv_bytes
def loadPrivateKey(self, key):
def load_private_key(self, key):
"""
For a ``RNS.Destination.GROUP`` type destination, loads a symmetric private key.
:param key: A *bytes-like* containing the symmetric key.
:raises: ``TypeError`` if called on an incompatible type of destination.
"""
if self.type == Destination.PLAIN:
raise TypeError("A plain destination does not hold any keys")
@ -168,7 +239,7 @@ class Destination:
self.prv_bytes = key
self.prv = Fernet(self.prv_bytes)
def loadPublicKey(self, key):
def load_public_key(self, key):
if self.type != Destination.SINGLE:
raise TypeError("Only the \"single\" destination type can hold a public key")
else:
@ -176,6 +247,12 @@ class Destination:
def encrypt(self, plaintext):
"""
Encrypts information for ``RNS.Destination.SINGLE`` or ``RNS.Destination.GROUP`` type destination.
:param plaintext: A *bytes-like* containing the plaintext to be encrypted.
:raises: ``ValueError`` if destination does not hold a necessary key for encryption.
"""
if self.type == Destination.PLAIN:
return plaintext
@ -195,6 +272,12 @@ class Destination:
def decrypt(self, ciphertext):
"""
Decrypts information for ``RNS.Destination.SINGLE`` or ``RNS.Destination.GROUP`` type destination.
:param ciphertext: A *bytes-like* containing the ciphertext to be decrypted.
:raises: ``ValueError`` if destination does not hold a necessary key for decryption.
"""
if self.type == Destination.PLAIN:
return ciphertext
@ -213,25 +296,51 @@ class Destination:
def sign(self, message):
"""
Signs information for ``RNS.Destination.SINGLE`` type destination.
:param message: A *bytes-like* containing the message to be signed.
:returns: A *bytes-like* containing the message signature, or *None* if the destination could not sign the message.
"""
if self.type == Destination.SINGLE and self.identity != None:
return self.identity.sign(message)
else:
return None
def set_default_app_data(self, app_data=None):
"""
Sets the default app_data for the destination. If set, the default
app_data will be included in every announce sent by the destination,
unless other app_data is specified in the *announce* method.
:param app_data: A *bytes-like* containing the default app_data, or a *callable* returning a *bytes-like* containing the app_data.
"""
self.default_app_data = app_data
def clear_default_app_data(self):
"""
Clears default app_data previously set for the destination.
"""
self.set_default_app_data(app_data=None)
# Creates an announce packet for this destination.
# Application specific data can be added to the announce.
def announce(self, app_data=None, path_response=False):
"""
Creates an announce packet for this destination and broadcasts it on
all interfaces. Application specific data can be added to the announce.
:param app_data: *bytes* containing the app_data.
:param path_response: Internal flag used by :ref:`RNS.Transport<Transport>`. Ignore.
"""
destination_hash = self.hash
random_hash = RNS.Identity.getRandomHash()
if app_data == None and self.default_app_data != None:
app_data = self.default_app_data
if isinstance(self.default_app_data, bytes):
app_data = self.default_app_data
elif callable(self.default_app_data):
returned_app_data = self.default_app_data()
if isinstance(returned_app_data, bytes):
app_data = returned_app_data
signed_data = self.hash+self.identity.getPublicKey()+random_hash
if app_data != None: