forked from LBRYCommunity/lbry-sdk
126 lines
3.4 KiB
Python
126 lines
3.4 KiB
Python
import re
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import unicodedata
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from typing import NamedTuple, Tuple
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def _create_url_regex():
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# see https://spec.lbry.com/
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def _named(name, regex):
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return "(?P<" + name + ">" + regex + ")"
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def _group(regex):
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return "(?:" + regex + ")"
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def _oneof(*choices):
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return _group('|'.join(choices))
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def _claim(name, prefix=""):
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return _group(
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_named(name+"_name", prefix + "[^=&#:$@%?/]+") +
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_oneof(
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_group('#' + _named(name+"_claim_id", "[0-9a-f]{1,40}")),
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_group(':' + _named(name+"_sequence", '[1-9][0-9]*')),
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_group(r'\$' + _named(name+"_amount_order", '[1-9][0-9]*'))
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) + '?'
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)
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return (
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'^' +
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_named("scheme", "lbry://") + '?' +
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_oneof(
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_group(_claim("channel_with_stream", "@") + "/" + _claim("stream_in_channel")),
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_claim("channel", "@"),
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_claim("stream")
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) +
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'$'
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)
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URL_REGEX = _create_url_regex()
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def normalize_name(name):
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return unicodedata.normalize('NFD', name).casefold()
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class PathSegment(NamedTuple):
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name: str
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claim_id: str = None
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sequence: int = None
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amount_order: int = None
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@property
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def normalized(self):
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return normalize_name(self.name)
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def to_dict(self):
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q = {'name': self.name}
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if self.claim_id is not None:
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q['claim_id'] = self.claim_id
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if self.sequence is not None:
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q['sequence'] = self.sequence
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if self.amount_order is not None:
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q['amount_order'] = self.amount_order
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return q
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def __str__(self):
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if self.claim_id is not None:
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return f"{self.name}#{self.claim_id}"
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elif self.sequence is not None:
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return f"{self.name}:{self.sequence}"
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elif self.amount_order is not None:
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return f"{self.name}${self.amount_order}"
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return self.name
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class URL(NamedTuple):
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stream: PathSegment
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channel: PathSegment
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@property
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def has_channel(self):
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return self.channel is not None
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@property
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def has_stream(self):
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return self.stream is not None
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@property
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def has_stream_in_channel(self):
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return self.has_channel and self.has_stream
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@property
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def parts(self) -> Tuple:
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if self.has_stream_in_channel:
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return self.channel, self.stream
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if self.has_channel:
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return self.channel,
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return self.stream,
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def __str__(self):
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return f"lbry://{'/'.join(str(p) for p in self.parts)}"
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@classmethod
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def parse(cls, url):
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match = re.match(URL_REGEX, url)
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if match is None:
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raise ValueError('Invalid LBRY URL')
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segments = {}
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parts = match.groupdict()
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for segment in ('channel', 'stream', 'channel_with_stream', 'stream_in_channel'):
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if parts[f'{segment}_name'] is not None:
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segments[segment] = PathSegment(
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parts[f'{segment}_name'],
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parts[f'{segment}_claim_id'],
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parts[f'{segment}_sequence'],
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parts[f'{segment}_amount_order']
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)
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if 'channel_with_stream' in segments:
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segments['channel'] = segments['channel_with_stream']
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segments['stream'] = segments['stream_in_channel']
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return cls(segments.get('stream', None), segments.get('channel', None))
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