Jon Staab
121 lines
3.8 KiB
TypeScript
121 lines
3.8 KiB
TypeScript
import {verifiedSymbol} from 'nostr-tools'
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import {verifyEvent, getEventHash} from 'nostr-tools'
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import {cached, pick, now} from '@welshman/lib'
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import {Tags} from './Tags'
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import {addressFromEvent, encodeAddress} from './Address'
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import {isEphemeralKind, isReplaceableKind, isPlainReplaceableKind, isParameterizedReplaceableKind} from './Kinds'
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export type EventTemplate = {
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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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}
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export type OwnedEvent = EventTemplate & {
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pubkey: string
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}
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export type HashedEvent = OwnedEvent & {
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id: string
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}
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export type SignedEvent = HashedEvent & {
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sig: string
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[verifiedSymbol]?: boolean
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}
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export type UnwrappedEvent = HashedEvent & {
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wrap: SignedEvent
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}
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export type TrustedEvent = HashedEvent & {
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sig?: string
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wrap?: SignedEvent
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[verifiedSymbol]?: boolean
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}
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export type CreateEventOpts = {
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content?: string
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tags?: string[][]
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created_at?: number
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}
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export const createEvent = (kind: number, {content = "", tags = [], created_at = now()}: CreateEventOpts) =>
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({kind, content, tags, created_at})
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export const isEventTemplate = (e: EventTemplate): e is EventTemplate =>
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Boolean(e.kind && e.tags && e.content && e.created_at)
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export const isOwnedEvent = (e: OwnedEvent): e is OwnedEvent =>
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Boolean(isEventTemplate(e) && e.pubkey)
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export const isHashedEvent = (e: HashedEvent): e is HashedEvent =>
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Boolean(isOwnedEvent(e) && e.id)
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export const isSignedEvent = (e: TrustedEvent): e is SignedEvent =>
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Boolean(isHashedEvent(e) && e.sig)
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export const isUnwrappedEvent = (e: TrustedEvent): e is UnwrappedEvent =>
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Boolean(isHashedEvent(e) && e.wrap)
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export const isTrustedEvent = (e: TrustedEvent): e is TrustedEvent =>
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isSignedEvent(e) || isUnwrappedEvent(e)
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export const asEventTemplate = (e: EventTemplate): EventTemplate =>
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pick(['kind', 'tags', 'content', 'created_at'], e)
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export const asOwnedEvent = (e: OwnedEvent): OwnedEvent =>
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pick(['kind', 'tags', 'content', 'created_at', 'pubkey'], e)
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export const asHashedEvent = (e: HashedEvent): HashedEvent =>
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pick(['kind', 'tags', 'content', 'created_at', 'pubkey', 'id'], e)
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export const asSignedEvent = (e: SignedEvent): SignedEvent =>
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pick(['kind', 'tags', 'content', 'created_at', 'pubkey', 'id', 'sig'], e)
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export const asUnwrappedEvent = (e: UnwrappedEvent): UnwrappedEvent =>
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pick(['kind', 'tags', 'content', 'created_at', 'pubkey', 'id', 'wrap'], e)
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export const asTrustedEvent = (e: TrustedEvent): TrustedEvent =>
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pick(['kind', 'tags', 'content', 'created_at', 'pubkey', 'id', 'sig', 'wrap'], e)
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export const hasValidSignature = cached<string, boolean, [SignedEvent]>({
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maxSize: 10000,
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getKey: ([e]: [SignedEvent]) => {
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try {
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return [getEventHash(e), e.sig].join(":")
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} catch (err) {
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return 'invalid'
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}
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},
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getValue: ([e]: [SignedEvent]) => {
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try {
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return verifyEvent(e)
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} catch (err) {
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return false
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}
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},
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})
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export const getAddress = (e: HashedEvent) => encodeAddress(addressFromEvent(e))
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export const getIdOrAddress = (e: HashedEvent) => isReplaceable(e) ? getAddress(e) : e.id
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export const getIdAndAddress = (e: HashedEvent) => isReplaceable(e) ? [e.id, getAddress(e)] : [e.id]
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export const isEphemeral = (e: EventTemplate) => isEphemeralKind(e.kind)
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export const isReplaceable = (e: EventTemplate) => isReplaceableKind(e.kind)
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export const isPlainReplaceable = (e: EventTemplate) => isPlainReplaceableKind(e.kind)
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export const isParameterizedReplaceable = (e: EventTemplate) => isParameterizedReplaceableKind(e.kind)
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export const isChildOf = (child: EventTemplate, parent: HashedEvent) => {
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const {roots, replies} = Tags.fromEvent(child).ancestors()
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const parentIds = (replies.exists() ? replies : roots).values().valueOf()
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return getIdAndAddress(parent).some(x => parentIds.includes(x))
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}
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