100 lines
3.2 KiB
TypeScript
100 lines
3.2 KiB
TypeScript
import { schnorr } from '@noble/curves/secp256k1'
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import { sha256 } from '@noble/hashes/sha256'
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import { bytesToHex } from '@noble/hashes/utils'
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import { getPublicKey } from './keys.ts'
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import { utf8Encoder } from './utils.ts'
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/** Designates a verified event signature. */
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export const verifiedSymbol = Symbol('verified')
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export interface Event {
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kind: number
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tags: string[][]
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content: string
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created_at: number
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pubkey: string
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id: string
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sig: string
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[verifiedSymbol]?: boolean
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}
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export type EventTemplate = Pick<Event, 'kind' | 'tags' | 'content' | 'created_at'>
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export type UnsignedEvent = Pick<Event, 'kind' | 'tags' | 'content' | 'created_at' | 'pubkey'>
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/** An event whose signature has been verified. */
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export interface VerifiedEvent extends Event {
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[verifiedSymbol]: true
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}
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export function finishEvent(t: EventTemplate, privateKey: string): VerifiedEvent {
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const event = t as VerifiedEvent
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event.pubkey = getPublicKey(privateKey)
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event.id = getEventHash(event)
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event.sig = getSignature(event, privateKey)
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event[verifiedSymbol] = true
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return event
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}
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export function serializeEvent(evt: UnsignedEvent): string {
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if (!validateEvent(evt)) throw new Error("can't serialize event with wrong or missing properties")
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return JSON.stringify([0, evt.pubkey, evt.created_at, evt.kind, evt.tags, evt.content])
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}
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export function getEventHash(event: UnsignedEvent): string {
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let eventHash = sha256(utf8Encoder.encode(serializeEvent(event)))
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return bytesToHex(eventHash)
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}
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const isRecord = (obj: unknown): obj is Record<string, unknown> => obj instanceof Object
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export function validateEvent<T>(event: T): event is T & UnsignedEvent {
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if (!isRecord(event)) return false
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if (typeof event.kind !== 'number') return false
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if (typeof event.content !== 'string') return false
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if (typeof event.created_at !== 'number') return false
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if (typeof event.pubkey !== 'string') return false
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if (!event.pubkey.match(/^[a-f0-9]{64}$/)) return false
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if (!Array.isArray(event.tags)) return false
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for (let i = 0; i < event.tags.length; i++) {
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let tag = event.tags[i]
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if (!Array.isArray(tag)) return false
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for (let j = 0; j < tag.length; j++) {
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if (typeof tag[j] === 'object') return false
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}
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}
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return true
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}
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/** Verify the event's signature. This function mutates the event with a `verified` symbol, making it idempotent. */
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export function verifySignature(event: Event): event is VerifiedEvent {
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if (typeof event[verifiedSymbol] === 'boolean') return event[verifiedSymbol]
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const hash = getEventHash(event)
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if (hash !== event.id) {
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return (event[verifiedSymbol] = false)
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}
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try {
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return (event[verifiedSymbol] = schnorr.verify(event.sig, hash, event.pubkey))
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} catch (err) {
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return (event[verifiedSymbol] = false)
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}
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}
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/** @deprecated Use `getSignature` instead. */
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export function signEvent(event: UnsignedEvent, key: string): string {
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console.warn(
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'nostr-tools: `signEvent` is deprecated and will be removed or changed in the future. Please use `getSignature` instead.',
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)
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return getSignature(event, key)
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}
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/** Calculate the signature for an event. */
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export function getSignature(event: UnsignedEvent, key: string): string {
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return bytesToHex(schnorr.sign(getEventHash(event), key))
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}
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