jlpoole/LMXF-specification
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Improved paper message packing

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This commit is contained in:
Mark Qvist 2022-11-22 19:53:25 +01:00
commit abe2e78283
2 changed files with 20 additions and 19 deletions
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27
LXMF/LXMessage.py
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@ -78,11 +78,11 @@ class LXMessage:
ENCRYPTION_DESCRIPTION_EC = "Curve25519"
ENCRYPTION_DESCRIPTION_UNENCRYPTED = "Unencrypted"
# Constants for QR/URL encoding LXMs
URL_PROTO_SPECIFIER = "lxm"
# Constants for QR/URI encoding LXMs
URI_SCHEMA = "lxm"
QR_ERROR_CORRECTION = "ERROR_CORRECT_L"
QR_MAX_STORAGE = 2953
PAPER_MDU = ((QR_MAX_STORAGE-(len(URL_PROTO_SPECIFIER)+len("://")))*6)//8
PAPER_MDU = ((QR_MAX_STORAGE-(len(URI_SCHEMA)+len("://")))*6)//8
def __str__(self):
if self.hash != None:
@ -123,6 +123,9 @@ class LXMessage:
self.state = LXMessage.DRAFT
self.method = LXMessage.UNKNOWN
self.propagation_packed = None
self.paper_packed = None
self.incoming = False
self.signature_validated = False
self.unverified_reason = None
@ -483,7 +486,7 @@ class LXMessage:
RNS.log("Error while writing LXMF message to file \""+str(file_path)+"\". The contained exception was: "+str(e), RNS.LOG_ERROR)
return None
def as_url(self, finalise=True):
def as_uri(self, finalise=True):
self.determine_transport_encryption()
if not self.packed:
self.pack()
@ -493,18 +496,15 @@ class LXMessage:
encoded_bytes = base64.urlsafe_b64encode(self.paper_packed)
# Add protocol specifier and return
lxm_url = LXMessage.URL_PROTO_SPECIFIER+"://"+encoded_bytes.decode("utf-8").replace("=","")
# TODO: Remove
# RNS.log(str(len(lxm_url))+" byte LXM URL: "+str(lxm_url), RNS.LOG_EXTREME)
lxm_uri = LXMessage.URI_SCHEMA+"://"+encoded_bytes.decode("utf-8").replace("=","")
if finalise:
self.__mark_paper_generated()
return lxm_url
return lxm_uri
else:
raise TypeError("Attempt to represent LXM with non-paper delivery method as URL")
raise TypeError("Attempt to represent LXM with non-paper delivery method as URI")
def as_qr(self):
self.determine_transport_encryption()
@ -519,7 +519,7 @@ class LXMessage:
qr = qrcode.make(
error_correction = qrcode.constants.__dict__[LXMessage.QR_ERROR_CORRECTION],
border = 1,
data = self.as_url(finalise=False),
data = self.as_uri(finalise=False),
)
self.__mark_paper_generated()
@ -535,7 +535,7 @@ class LXMessage:
raise TypeError("Attempt to represent LXM with non-paper delivery method as QR-code")
@staticmethod
def unpack_from_bytes(lxmf_bytes):
def unpack_from_bytes(lxmf_bytes, original_method = None):
destination_hash = lxmf_bytes[:LXMessage.DESTINATION_LENGTH]
source_hash = lxmf_bytes[LXMessage.DESTINATION_LENGTH:2*LXMessage.DESTINATION_LENGTH]
signature = lxmf_bytes[2*LXMessage.DESTINATION_LENGTH:2*LXMessage.DESTINATION_LENGTH+LXMessage.SIGNATURE_LENGTH]
@ -568,7 +568,8 @@ class LXMessage:
title = "",
fields = fields,
destination_hash = destination_hash,
source_hash = source_hash)
source_hash = source_hash,
desired_method = original_method)
message.hash = message_hash
message.signature = signature