lbry-sdk/lbrynet/wallet/resolve.py

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import logging
from ecdsa import BadSignatureError
from binascii import unhexlify, hexlify
from twisted.internet import defer
from lbrynet.core.Error import UnknownNameError, UnknownClaimID, UnknownURI, UnknownOutpoint
from lbryschema.address import is_address
from lbryschema.claim import ClaimDict
from lbryschema.decode import smart_decode
from lbryschema.error import DecodeError
from lbryschema.uri import parse_lbry_uri
from .claim_proofs import verify_proof, InvalidProofError
log = logging.getLogger(__name__)
class Resolver:
def __init__(self, claim_trie_root, height, transaction_class, hash160_to_address, network):
self.claim_trie_root = claim_trie_root
self.height = height
self.transaction_class = transaction_class
self.hash160_to_address = hash160_to_address
self.network = network
@defer.inlineCallbacks
def _handle_resolutions(self, resolutions, requested_uris, page, page_size):
results = {}
for uri in requested_uris:
resolution = (resolutions or {}).get(uri, {})
if resolution:
try:
results[uri] = _handle_claim_result(
(yield self._handle_resolve_uri_response(uri, resolution, page, page_size))
)
except (UnknownNameError, UnknownClaimID, UnknownURI) as err:
results[uri] = {'error': str(err)}
else:
results[uri] = {'error': "URI lbry://{} cannot be resolved".format(uri.replace("lbry://", ""))}
defer.returnValue(results)
@defer.inlineCallbacks
def _handle_resolve_uri_response(self, uri, resolution, page=0, page_size=10, raw=False):
result = {}
claim_trie_root = self.claim_trie_root
parsed_uri = parse_lbry_uri(uri)
certificate = None
# parse an included certificate
if 'certificate' in resolution:
certificate_response = resolution['certificate']['result']
certificate_resolution_type = resolution['certificate']['resolution_type']
if certificate_resolution_type == "winning" and certificate_response:
if 'height' in certificate_response:
height = certificate_response['height']
depth = self.height - height
certificate_result = _verify_proof(parsed_uri.name,
claim_trie_root,
certificate_response,
height, depth,
transaction_class=self.transaction_class,
hash160_to_address=self.hash160_to_address)
result['certificate'] = self.parse_and_validate_claim_result(certificate_result,
raw=raw)
elif certificate_resolution_type == "claim_id":
result['certificate'] = self.parse_and_validate_claim_result(certificate_response,
raw=raw)
elif certificate_resolution_type == "sequence":
result['certificate'] = self.parse_and_validate_claim_result(certificate_response,
raw=raw)
else:
log.error("unknown response type: %s", certificate_resolution_type)
if 'certificate' in result:
certificate = result['certificate']
if 'unverified_claims_in_channel' in resolution:
max_results = len(resolution['unverified_claims_in_channel'])
result['claims_in_channel'] = max_results
else:
result['claims_in_channel'] = 0
else:
result['error'] = "claim not found"
result['success'] = False
result['uri'] = str(parsed_uri)
else:
certificate = None
# if this was a resolution for a name, parse the result
if 'claim' in resolution:
claim_response = resolution['claim']['result']
claim_resolution_type = resolution['claim']['resolution_type']
if claim_resolution_type == "winning" and claim_response:
if 'height' in claim_response:
height = claim_response['height']
depth = self.height - height
claim_result = _verify_proof(parsed_uri.name,
claim_trie_root,
claim_response,
height, depth,
transaction_class=self.transaction_class,
hash160_to_address=self.hash160_to_address)
result['claim'] = self.parse_and_validate_claim_result(claim_result,
certificate,
raw)
elif claim_resolution_type == "claim_id":
result['claim'] = self.parse_and_validate_claim_result(claim_response,
certificate,
raw)
elif claim_resolution_type == "sequence":
result['claim'] = self.parse_and_validate_claim_result(claim_response,
certificate,
raw)
else:
log.error("unknown response type: %s", claim_resolution_type)
# if this was a resolution for a name in a channel make sure there is only one valid
# match
elif 'unverified_claims_for_name' in resolution and 'certificate' in result:
unverified_claims_for_name = resolution['unverified_claims_for_name']
channel_info = yield self.get_channel_claims_page(unverified_claims_for_name,
result['certificate'], page=1)
claims_in_channel, upper_bound = channel_info
if len(claims_in_channel) > 1:
log.error("Multiple signed claims for the same name")
elif not claims_in_channel:
log.error("No valid claims for this name for this channel")
else:
result['claim'] = claims_in_channel[0]
# parse and validate claims in a channel iteratively into pages of results
elif 'unverified_claims_in_channel' in resolution and 'certificate' in result:
ids_to_check = resolution['unverified_claims_in_channel']
channel_info = yield self.get_channel_claims_page(ids_to_check, result['certificate'],
page=page, page_size=page_size)
claims_in_channel, upper_bound = channel_info
if claims_in_channel:
result['claims_in_channel'] = claims_in_channel
elif 'error' not in result:
result['error'] = "claim not found"
result['success'] = False
result['uri'] = str(parsed_uri)
defer.returnValue(result)
@defer.inlineCallbacks
def get_certificate_and_validate_result(self, claim_result):
if not claim_result or 'value' not in claim_result:
return claim_result
certificate = None
certificate_id = smart_decode(claim_result['value']).certificate_id
if certificate_id:
certificate = yield self.network.get_claims_by_ids(certificate_id.decode())
certificate = certificate.pop(certificate_id.decode()) if certificate else None
return self.parse_and_validate_claim_result(claim_result, certificate=certificate)
def parse_and_validate_claim_result(self, claim_result, certificate=None, raw=False):
if not claim_result or 'value' not in claim_result:
return claim_result
claim_result['decoded_claim'] = False
decoded = None
if not raw:
claim_value = claim_result['value']
try:
decoded = smart_decode(claim_value)
claim_result['value'] = decoded.claim_dict
claim_result['decoded_claim'] = True
except DecodeError:
pass
if decoded:
claim_result['has_signature'] = False
if decoded.has_signature:
if certificate is None:
log.info("fetching certificate to check claim signature")
certificate = self.network.get_claims_by_ids(decoded.certificate_id)
if not certificate:
log.warning('Certificate %s not found', decoded.certificate_id)
claim_result['has_signature'] = True
claim_result['signature_is_valid'] = False
validated, channel_name = validate_claim_signature_and_get_channel_name(
decoded, certificate, claim_result['address'])
claim_result['channel_name'] = channel_name
if validated:
claim_result['signature_is_valid'] = True
if 'height' in claim_result and claim_result['height'] is None:
claim_result['height'] = -1
if 'amount' in claim_result and not isinstance(claim_result['amount'], float):
claim_result = format_amount_value(claim_result)
claim_result['permanent_url'] = _get_permanent_url(claim_result)
return claim_result
@staticmethod
def prepare_claim_queries(start_position, query_size, channel_claim_infos):
queries = [tuple()]
names = {}
# a table of index counts for the sorted claim ids, including ignored claims
absolute_position_index = {}
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block_sorted_infos = sorted(channel_claim_infos.items(), key=lambda x: int(x[1][1]))
per_block_infos = {}
for claim_id, (name, height) in block_sorted_infos:
claims = per_block_infos.get(height, [])
claims.append((claim_id, name))
per_block_infos[height] = sorted(claims, key=lambda x: int(x[0], 16))
abs_position = 0
for height in sorted(per_block_infos.keys(), reverse=True):
for claim_id, name in per_block_infos[height]:
names[claim_id] = name
absolute_position_index[claim_id] = abs_position
if abs_position >= start_position:
if len(queries[-1]) >= query_size:
queries.append(tuple())
queries[-1] += (claim_id,)
abs_position += 1
return queries, names, absolute_position_index
@defer.inlineCallbacks
def iter_channel_claims_pages(self, queries, claim_positions, claim_names, certificate,
page_size=10):
# lbryum server returns a dict of {claim_id: (name, claim_height)}
# first, sort the claims by block height (and by claim id int value within a block).
# map the sorted claims into getclaimsbyids queries of query_size claim ids each
# send the batched queries to lbryum server and iteratively validate and parse
# the results, yield a page of results at a time.
# these results can include those where `signature_is_valid` is False. if they are skipped,
# page indexing becomes tricky, as the number of results isn't known until after having
# processed them.
# TODO: fix ^ in lbryschema
@defer.inlineCallbacks
def iter_validate_channel_claims():
formatted_claims = []
for claim_ids in queries:
batch_result = yield self.network.get_claims_by_ids(*claim_ids)
for claim_id in claim_ids:
claim = batch_result[claim_id]
if claim['name'] == claim_names[claim_id]:
formatted_claim = self.parse_and_validate_claim_result(claim, certificate)
formatted_claim['absolute_channel_position'] = claim_positions[
claim['claim_id']]
formatted_claims.append(formatted_claim)
else:
log.warning("ignoring claim with name mismatch %s %s", claim['name'],
claim['claim_id'])
defer.returnValue(formatted_claims)
yielded_page = False
results = []
for claim in (yield iter_validate_channel_claims()):
results.append(claim)
# if there is a full page of results, yield it
if len(results) and len(results) % page_size == 0:
defer.returnValue(results[-page_size:])
yielded_page = True
# if we didn't get a full page of results, yield what results we did get
if not yielded_page:
defer.returnValue(results)
@defer.inlineCallbacks
def get_channel_claims_page(self, channel_claim_infos, certificate, page, page_size=10):
page = page or 0
page_size = max(page_size, 1)
if page_size > 500:
raise Exception("page size above maximum allowed")
start_position = (page - 1) * page_size
queries, names, claim_positions = self.prepare_claim_queries(start_position, page_size,
channel_claim_infos)
page_generator = yield self.iter_channel_claims_pages(queries, claim_positions, names,
certificate, page_size=page_size)
upper_bound = len(claim_positions)
if not page:
defer.returnValue((None, upper_bound))
if start_position > upper_bound:
raise IndexError("claim %i greater than max %i" % (start_position, upper_bound))
defer.returnValue((page_generator, upper_bound))
# Format amount to be decimal encoded string
# Format value to be hex encoded string
# TODO: refactor. Came from lbryum, there could be another part of torba doing it
def format_amount_value(obj):
COIN = 100000000
if isinstance(obj, dict):
for k, v in obj.items():
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if k in ('amount', 'effective_amount'):
if not isinstance(obj[k], float):
obj[k] = float(obj[k]) / float(COIN)
elif k == 'supports' and isinstance(v, list):
obj[k] = [{'txid': txid, 'nout': nout, 'amount': float(amount) / float(COIN)}
for (txid, nout, amount) in v]
elif isinstance(v, (list, dict)):
obj[k] = format_amount_value(v)
elif isinstance(obj, list):
obj = [format_amount_value(o) for o in obj]
return obj
def _get_permanent_url(claim_result):
if claim_result.get('has_signature') and claim_result.get('channel_name'):
return "{0}#{1}/{2}".format(
claim_result['channel_name'],
claim_result['value']['publisherSignature']['certificateId'],
claim_result['name']
)
else:
return "{0}#{1}".format(
claim_result['name'],
claim_result['claim_id']
)
def _verify_proof(name, claim_trie_root, result, height, depth, transaction_class, hash160_to_address):
"""
Verify proof for name claim
"""
def _build_response(name, value, claim_id, txid, n, amount, effective_amount,
claim_sequence, claim_address, supports):
r = {
'name': name,
'value': hexlify(value),
'claim_id': claim_id,
'txid': txid,
'nout': n,
'amount': amount,
'effective_amount': effective_amount,
'height': height,
'depth': depth,
'claim_sequence': claim_sequence,
'address': claim_address,
'supports': supports
}
return r
def _parse_proof_result(name, result):
support_amount = sum([amt for (stxid, snout, amt) in result['supports']])
supports = result['supports']
if 'txhash' in result['proof'] and 'nOut' in result['proof']:
if 'transaction' in result:
tx = transaction_class(raw=unhexlify(result['transaction']))
nOut = result['proof']['nOut']
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if result['proof']['txhash'] == tx.id:
if 0 <= nOut < len(tx.outputs):
claim_output = tx.outputs[nOut]
effective_amount = claim_output.amount + support_amount
claim_address = hash160_to_address(claim_output.script.values['pubkey_hash'])
claim_id = result['claim_id']
claim_sequence = result['claim_sequence']
claim_script = claim_output.script
decoded_name = claim_script.values['claim_name'].decode()
decoded_value = claim_script.values['claim']
if decoded_name == name:
return _build_response(name, decoded_value, claim_id,
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tx.id, nOut, claim_output.amount,
effective_amount, claim_sequence,
claim_address, supports)
return {'error': 'name in proof did not match requested name'}
outputs = len(tx['outputs'])
return {'error': 'invalid nOut: %d (let(outputs): %d' % (nOut, outputs)}
return {'error': "computed txid did not match given transaction: %s vs %s" %
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(tx.id, result['proof']['txhash'])
}
return {'error': "didn't receive a transaction with the proof"}
return {'error': 'name is not claimed'}
if 'proof' in result:
try:
verify_proof(result['proof'], claim_trie_root, name)
except InvalidProofError:
return {'error': "Proof was invalid"}
return _parse_proof_result(name, result)
else:
return {'error': "proof not in result"}
def validate_claim_signature_and_get_channel_name(claim, certificate_claim,
claim_address, decoded_certificate=None):
if not certificate_claim:
return False, None
certificate = decoded_certificate or smart_decode(certificate_claim['value'])
if not isinstance(certificate, ClaimDict):
raise TypeError("Certificate is not a ClaimDict: %s" % str(type(certificate)))
if _validate_signed_claim(claim, claim_address, certificate):
return True, certificate_claim['name']
return False, None
def _validate_signed_claim(claim, claim_address, certificate):
if not claim.has_signature:
raise Exception("Claim is not signed")
if not is_address(claim_address):
raise Exception("Not given a valid claim address")
try:
if claim.validate_signature(claim_address, certificate.protobuf):
return True
except BadSignatureError:
# print_msg("Signature for %s is invalid" % claim_id)
return False
except Exception as err:
log.error("Signature for %s is invalid, reason: %s - %s", claim_address,
str(type(err)), err)
return False
return False
# TODO: The following came from code handling lbryum results. Now that it's all in one place a refactor should unify it.
def _decode_claim_result(claim):
if 'has_signature' in claim and claim['has_signature']:
if not claim['signature_is_valid']:
log.warning("lbry://%s#%s has an invalid signature",
claim['name'], claim['claim_id'])
try:
decoded = smart_decode(claim['value'])
claim_dict = decoded.claim_dict
claim['value'] = claim_dict
claim['hex'] = hexlify(decoded.serialized)
except DecodeError:
claim['hex'] = claim['value']
claim['value'] = None
claim['error'] = "Failed to decode value"
return claim
def _handle_claim_result(results):
if not results:
#TODO: cannot determine what name we searched for here
# we should fix lbryum commands that return None
raise UnknownNameError("")
if 'error' in results:
if results['error'] in ['name is not claimed', 'claim not found']:
if 'claim_id' in results:
raise UnknownClaimID(results['claim_id'])
elif 'name' in results:
raise UnknownNameError(results['name'])
elif 'uri' in results:
raise UnknownURI(results['uri'])
elif 'outpoint' in results:
raise UnknownOutpoint(results['outpoint'])
raise Exception(results['error'])
# case where return value is {'certificate':{'txid', 'value',...},...}
if 'certificate' in results:
results['certificate'] = _decode_claim_result(results['certificate'])
# case where return value is {'claim':{'txid','value',...},...}
if 'claim' in results:
results['claim'] = _decode_claim_result(results['claim'])
# case where return value is {'txid','value',...}
# returned by queries that are not name resolve related
# (getclaimbyoutpoint, getclaimbyid, getclaimsfromtx)
elif 'value' in results:
results = _decode_claim_result(results)
# case where there is no 'certificate', 'value', or 'claim' key
elif 'certificate' not in results:
msg = 'result in unexpected format:{}'.format(results)
assert False, msg
return results