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import type { ProxyFetchRequest, ProxyResponse } from './types'
import { ABORT, CONTINUE, UNHANDLED } from './types'
export type FetchHandlerResult =
| Response
| 'abort'
| 'continue'
| null
| undefined
export type FetchHandler = (
testData: string,
request: Request
) => FetchHandlerResult | Promise<FetchHandlerResult>
function buildRequest(req: ProxyFetchRequest): Request {
const { request: proxyRequest } = req
const { url, headers, body, ...options } = proxyRequest
return new Request(url, {
...options,
headers: new Headers(headers),
body: body ? Buffer.from(body, 'base64') : null,
})
}
async function buildResponse(
response: FetchHandlerResult
): Promise<ProxyResponse> {
if (!response) {
return UNHANDLED
}
if (response === 'abort') {
return ABORT
}
if (response === 'continue') {
return CONTINUE
}
const { status, headers, body } = response
return {
api: 'fetch',
response: {
status,
headers: Array.from(headers),
body: body
? Buffer.from(await response.arrayBuffer()).toString('base64')
: null,
},
}
}
export async function handleFetch(
req: ProxyFetchRequest,
onFetch: FetchHandler
): Promise<ProxyResponse> {
const { testData } = req
const request = buildRequest(req)
const response = await onFetch(testData, request)
return buildResponse(response)
}
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