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import type { CapturedRequest, FetchLike, HttpExchangeFixture } from "./types.js";
export interface ReplayOptions {
chunkBytes?: number;
}
export interface ReplayResult {
fetch: FetchLike;
getCapturedRequest: () => CapturedRequest | undefined;
}
export function replayFetch(fixture: HttpExchangeFixture, opts?: ReplayOptions): ReplayResult {
let captured: CapturedRequest | undefined;
const replay: FetchLike = async (input, init) => {
const url = typeof input === "string" ? input : input instanceof URL ? input.href : input.url;
const method = extractMethod(input, init);
const headers = normalizeHeaders(
init?.headers as Record<string, string> | Headers | [string, string][] | undefined,
);
const body =
init?.body != null
? await readBody(
init.body as
| string
| Blob
| ArrayBuffer
| ArrayBufferView
| URLSearchParams
| ReadableStream,
)
: null;
captured = { method, url, headers, body };
const isNullBodyStatus =
fixture.response.status === 204 ||
fixture.response.status === 205 ||
fixture.response.status === 304;
const responseBody = isNullBodyStatus
? null
: buildBodyStream(fixture.response.body, opts?.chunkBytes);
const responseInit: { status: number; headers: Record<string, string>; statusText?: string } = {
status: fixture.response.status,
headers: fixture.response.headers,
};
if (fixture.response.statusText !== undefined) {
responseInit.statusText = fixture.response.statusText;
}
return new Response(responseBody, responseInit);
};
return {
fetch: replay,
getCapturedRequest: () => captured,
};
}
function extractMethod(input: string | URL | Request, init: RequestInit | undefined): string {
if (init?.method) return init.method;
if (typeof input !== "string" && !(input instanceof URL) && "method" in input) {
return input.method;
}
return "GET";
}
function normalizeHeaders(
raw: Headers | Record<string, string> | [string, string][] | undefined,
): Record<string, string> {
if (!raw) return {};
if (raw instanceof Headers) {
const out: Record<string, string> = {};
raw.forEach((v, k) => {
out[k] = v;
});
return out;
}
if (Array.isArray(raw)) {
const out: Record<string, string> = {};
for (const [k, v] of raw) out[k] = v;
return out;
}
return { ...raw };
}
async function readBody(
body: string | Blob | ArrayBuffer | ArrayBufferView | URLSearchParams | ReadableStream,
): Promise<string | null> {
if (typeof body === "string") return body;
if (body instanceof Blob) return body.text();
if (body instanceof ArrayBuffer) return new TextDecoder().decode(body);
if (ArrayBuffer.isView(body)) return new TextDecoder().decode(body.buffer);
if (body instanceof URLSearchParams) return body.toString();
if (body instanceof ReadableStream) {
const reader = body.getReader();
const chunks: Uint8Array[] = [];
while (true) {
const { done, value } = await reader.read();
if (done) break;
chunks.push(value);
}
return new TextDecoder().decode(concatUint8Arrays(chunks));
}
return null;
}
function concatUint8Arrays(arrays: Uint8Array[]): Uint8Array {
let totalLen = 0;
for (const a of arrays) totalLen += a.byteLength;
const out = new Uint8Array(totalLen);
let offset = 0;
for (const a of arrays) {
out.set(a, offset);
offset += a.byteLength;
}
return out;
}
function buildBodyStream(body: string, chunkBytes: number | undefined): ReadableStream<Uint8Array> {
const encoder = new TextEncoder();
const encoded = encoder.encode(body);
if (!chunkBytes || chunkBytes <= 0 || chunkBytes >= encoded.byteLength) {
return new ReadableStream<Uint8Array>({
start(controller) {
controller.enqueue(encoded);
controller.close();
},
});
}
let offset = 0;
return new ReadableStream<Uint8Array>({
pull(controller) {
if (offset >= encoded.byteLength) {
controller.close();
return;
}
const end = Math.min(offset + chunkBytes, encoded.byteLength);
controller.enqueue(encoded.slice(offset, end));
offset = end;
},
});
}
|
