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fetch_jwks.ts
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fetch_jwks.ts
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import type { FetchFunction } from './interfaces.d.ts'
import { JOSEError, JWKSTimeout } from '../util/errors.ts'
type AcceptedRequestOptions = Pick<RequestInit, 'headers'>
const fetchJwks: FetchFunction = async (
url: URL,
timeout: number,
options: AcceptedRequestOptions,
) => {
let controller!: AbortController
let id!: ReturnType<typeof setTimeout>
let timedOut = false
if (typeof AbortController === 'function') {
controller = new AbortController()
id = setTimeout(() => {
timedOut = true
controller.abort()
}, timeout)
}
const response = await fetch(url.href, {
signal: controller ? controller.signal : undefined,
redirect: 'manual',
headers: options.headers,
}).catch((err) => {
if (timedOut) throw new JWKSTimeout()
throw err
})
if (id !== undefined) clearTimeout(id)
if (response.status !== 200) {
throw new JOSEError('Expected 200 OK from the JSON Web Key Set HTTP response')
}
try {
return await response.json()
} catch {
throw new JOSEError('Failed to parse the JSON Web Key Set HTTP response as JSON')
}
}
export default fetchJwks