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filter.ts
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filter.ts
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import {Event} from './event'
export type Filter = {
ids?: string[]
kinds?: number[]
authors?: string[]
since?: number
until?: number
limit?: number
[key: `#${string}`]: string[]
}
export function matchFilter(
filter: Filter,
event: Event & {id: string}
): boolean {
if (filter.ids && filter.ids.indexOf(event.id) === -1) return false
if (filter.kinds && filter.kinds.indexOf(event.kind) === -1) return false
if (filter.authors && filter.authors.indexOf(event.pubkey) === -1)
return false
for (let f in filter) {
if (f[0] === '#') {
let tagName = f.slice(1)
let values = filter[`#${tagName}`]
if (
values &&
!event.tags.find(
([t, v]) => t === f.slice(1) && values.indexOf(v) !== -1
)
)
return false
}
}
if (filter.since && event.created_at < filter.since) return false
if (filter.until && event.created_at >= filter.until) return false
return true
}
export function matchFilters(
filters: Filter[],
event: Event & {id: string}
): boolean {
for (let i = 0; i < filters.length; i++) {
if (matchFilter(filters[i], event)) return true
}
return false
}