103 lines
3 KiB
Python
103 lines
3 KiB
Python
import hashlib
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import json
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from enum import Enum
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from pydantic import BaseModel, Field
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from secp256k1 import PublicKey
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class NostrEventType(str, Enum):
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EVENT = "EVENT"
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REQ = "REQ"
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CLOSE = "CLOSE"
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AUTH = "AUTH"
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class NostrEvent(BaseModel):
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id: str
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relay_id: str
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publisher: str
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pubkey: str
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created_at: int
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kind: int
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tags: list[list[str]] = Field(default=[], no_database=True)
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content: str = ""
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sig: str
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def nostr_dict(self) -> dict:
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_nostr_dict = dict(self)
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_nostr_dict.pop("relay_id")
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_nostr_dict.pop("publisher")
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return _nostr_dict
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def serialize(self) -> list:
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return [0, self.pubkey, self.created_at, self.kind, self.tags, self.content]
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def serialize_json(self) -> str:
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e = self.serialize()
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return json.dumps(e, separators=(",", ":"), ensure_ascii=False)
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@property
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def event_id(self) -> str:
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data = self.serialize_json()
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return hashlib.sha256(data.encode()).hexdigest()
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@property
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def size_bytes(self) -> int:
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s = json.dumps(self.nostr_dict(), separators=(",", ":"), ensure_ascii=False)
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return len(s.encode())
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@property
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def is_replaceable_event(self) -> bool:
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return self.kind in [0, 3, 41] or (self.kind >= 10000 and self.kind < 20000)
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@property
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def is_auth_response_event(self) -> bool:
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return self.kind == 22242
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@property
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def is_direct_message(self) -> bool:
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return self.kind == 4
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@property
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def is_delete_event(self) -> bool:
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return self.kind == 5
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@property
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def is_regular_event(self) -> bool:
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return self.kind >= 1000 and self.kind < 10000
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@property
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def is_ephemeral_event(self) -> bool:
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return self.kind >= 20000 and self.kind < 30000
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def check_signature(self):
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event_id = self.event_id
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if self.id != event_id:
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raise ValueError(
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f"Invalid event id. Expected: '{event_id}' got '{self.id}'"
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)
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try:
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pub_key = PublicKey(bytes.fromhex("02" + self.pubkey), True)
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except Exception as exc:
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raise ValueError(
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f"Invalid public key: '{self.pubkey}' for event '{self.id}'"
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) from exc
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valid_signature = pub_key.schnorr_verify(
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bytes.fromhex(event_id), bytes.fromhex(self.sig), None, raw=True
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)
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if not valid_signature:
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raise ValueError(f"Invalid signature: '{self.sig}' for event '{self.id}'")
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def serialize_response(self, subscription_id):
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return [NostrEventType.EVENT, subscription_id, self.nostr_dict()]
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def tag_values(self, tag_name: str) -> list[str]:
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return [t[1] for t in self.tags if t[0] == tag_name]
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def has_tag_value(self, tag_name: str, tag_value: str) -> bool:
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return tag_value in self.tag_values(tag_name)
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def is_direct_message_for_pubkey(self, pubkey: str) -> bool:
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return self.is_direct_message and self.has_tag_value("p", pubkey)
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