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import AtpAgent from '@atproto/api'
import RNFS from 'react-native-fs'
const GET_TIMEOUT = 15e3 // 15s
const POST_TIMEOUT = 60e3 // 60s
export function doPolyfill() {
AtpAgent.configure({fetch: fetchHandler})
}
interface FetchHandlerResponse {
status: number
headers: Record<string, string>
body: ArrayBuffer | undefined
}
async function fetchHandler(
reqUri: string,
reqMethod: string,
reqHeaders: Record<string, string>,
reqBody: any,
): Promise<FetchHandlerResponse> {
const reqMimeType = reqHeaders['Content-Type'] || reqHeaders['content-type']
if (reqMimeType && reqMimeType.startsWith('application/json')) {
reqBody = JSON.stringify(reqBody)
} else if (
typeof reqBody === 'string' &&
(reqBody.startsWith('/') || reqBody.startsWith('file:'))
) {
if (reqBody.endsWith('.jpeg') || reqBody.endsWith('.jpg')) {
// HACK
// React native has a bug that inflates the size of jpegs on upload
// we get around that by renaming the file ext to .bin
// see https://github.com/facebook/react-native/issues/27099
// -prf
const newPath = reqBody.replace(/\.jpe?g$/, '.bin')
await RNFS.moveFile(reqBody, newPath)
reqBody = newPath
}
// NOTE
// React native treats bodies with {uri: string} as file uploads to pull from cache
// -prf
reqBody = {uri: reqBody}
}
const controller = new AbortController()
const to = setTimeout(
() => controller.abort(),
reqMethod === 'post' ? POST_TIMEOUT : GET_TIMEOUT,
)
const res = await fetch(reqUri, {
method: reqMethod,
headers: reqHeaders,
body: reqBody,
signal: controller.signal,
})
const resStatus = res.status
const resHeaders: Record<string, string> = {}
res.headers.forEach((value: string, key: string) => {
resHeaders[key] = value
})
const resMimeType = resHeaders['Content-Type'] || resHeaders['content-type']
let resBody
if (resMimeType) {
if (resMimeType.startsWith('application/json')) {
resBody = await res.json()
} else if (resMimeType.startsWith('text/')) {
resBody = await res.text()
} else {
throw new Error('TODO: non-textual response body')
}
}
clearTimeout(to)
return {
status: resStatus,
headers: resHeaders,
body: resBody,
}
}
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