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nip25.ts
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nip25.ts
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import {Event, finishEvent, Kind} from './event.ts'
import type {EventPointer} from './nip19.ts'
export type ReactionEventTemplate = {
/**
* Pass only non-nip25 tags if you have to. Nip25 tags ('e' and 'p' tags from reacted event) will be added automatically.
*/
tags?: string[][]
/**
* @default '+'
*/
content?: string
created_at: number
}
export function finishReactionEvent(
t: ReactionEventTemplate,
reacted: Event<number>,
privateKey: string,
): Event<Kind.Reaction> {
const inheritedTags = reacted.tags.filter(
(tag) => tag.length >= 2 && (tag[0] === 'e' || tag[0] === 'p'),
)
return finishEvent({
...t,
kind: Kind.Reaction,
tags: [
...(t.tags ?? []),
...inheritedTags,
['e', reacted.id],
['p', reacted.pubkey],
],
content: t.content ?? '+',
}, privateKey)
}
export function getReactedEventPointer(event: Event<number>): undefined | EventPointer {
if (event.kind !== Kind.Reaction) {
return undefined
}
let lastETag: undefined | string[]
let lastPTag: undefined | string[]
for (let i = event.tags.length - 1; i >= 0 && (lastETag === undefined || lastPTag === undefined); i--) {
const tag = event.tags[i]
if (tag.length >= 2) {
if (tag[0] === 'e' && lastETag === undefined) {
lastETag = tag
} else if (tag[0] === 'p' && lastPTag === undefined) {
lastPTag = tag
}
}
}
if (lastETag === undefined || lastPTag === undefined) {
return undefined
}
return {
id: lastETag[1],
relays: [ lastETag[2], lastPTag[2] ].filter((x) => x !== undefined),
author: lastPTag[1],
}
}