96 lines
2.3 KiB
JavaScript
96 lines
2.3 KiB
JavaScript
// Override window.requestUrl to proxy external requests through our server, bypassing CORS.
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// Obsidian sets window.requestUrl in app.js, so we override it after app.js loads.
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import { isSameOrigin } from "./util/url.js";
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import { arrayBufferToBase64, base64ToArrayBuffer } from "./util/base64.js";
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async function proxyRequestUrl(request) {
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if (typeof request === "string") {
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request = { url: request };
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}
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// Same-origin requests don't need the proxy.
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if (isSameOrigin(request.url)) {
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const res = await fetch(request.url, {
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method: request.method || "GET",
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headers: request.headers || {},
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body: request.body,
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});
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const arrayBuf = await res.arrayBuffer();
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return makeResponse(
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request,
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res.status,
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Object.fromEntries(res.headers),
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arrayBuf,
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);
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}
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// Cross-origin: route through server proxy
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let body = request.body;
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let binary = false;
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if (body instanceof ArrayBuffer) {
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body = arrayBufferToBase64(body);
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binary = true;
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}
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const res = await fetch("/api/proxy", {
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method: "POST",
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headers: { "Content-Type": "application/json" },
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body: JSON.stringify({
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url: request.url,
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method: request.method || "GET",
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headers: request.headers || {},
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body,
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binary,
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}),
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});
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if (!res.ok) {
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const err = await res
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.json()
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.catch(() => ({ error: "Proxy request failed" }));
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throw new Error(err.error);
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}
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const proxyResult = await res.json();
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const arrayBuf = base64ToArrayBuffer(proxyResult.body);
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return makeResponse(
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request,
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proxyResult.status,
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proxyResult.headers,
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arrayBuf,
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);
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}
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function makeResponse(request, status, headers, arrayBuf) {
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const text = new TextDecoder().decode(arrayBuf);
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let json;
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try {
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json = JSON.parse(text);
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} catch {
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json = null;
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}
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return { status, headers, arrayBuffer: arrayBuf, text, json };
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}
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export function installRequestUrlShim() {
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// Obsidian sets window.requestUrl in app.js. We override it once the page loads.
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// Use a getter so it intercepts even if app.js sets it later.
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let _original = null;
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Object.defineProperty(window, "requestUrl", {
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get() {
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return proxyRequestUrl;
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},
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set(val) {
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_original = val;
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},
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configurable: true,
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});
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}
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