jiti-meet/react/features/base/util/loadScript.native.ts

63 lines
2.1 KiB
TypeScript
Raw Normal View History

/**
* Default timeout for loading scripts.
*/
const DEFAULT_TIMEOUT = 5000;
/**
2016-12-07 22:00:54 +00:00
* Loads a script from a specific URL. React Native cannot load a JS
* file/resource/URL via a <script> HTML element, so the implementation
* fetches the specified {@code url} as plain text using {@link fetch()} and
2017-08-31 19:16:44 +00:00
* then evaluates the fetched string as JavaScript code (using {@link eval()}).
*
2017-08-31 19:16:44 +00:00
* @param {string} url - The absolute URL from which the script is to be
2016-12-07 22:00:54 +00:00
* (down)loaded.
* @param {number} [timeout] - The timeout in millisecnods after which the
* loading of the specified {@code url} is to be aborted/rejected (if not
* settled yet).
* @param {boolean} skipEval - Whether we want to skip evaluating the loaded content or not.
* @returns {void}
*/
export async function loadScript(
2022-07-29 13:18:14 +00:00
url: string, timeout: number = DEFAULT_TIMEOUT, skipEval = false): Promise<any> {
// XXX The implementation of fetch on Android will throw an Exception on
// the Java side which will break the app if the URL is invalid (which
// the implementation of fetch on Android calls 'unexpected url'). In
// order to try to prevent the breakage of the app, try to fail on an
// invalid URL as soon as possible.
const { hostname, pathname, protocol } = new URL(url);
// XXX The standard URL implementation should throw an Error if the
// specified URL is relative. Unfortunately, the polyfill used on
// react-native does not.
if (!hostname || !pathname || !protocol) {
throw new Error(`unexpected url: ${url}`);
}
const controller = new AbortController();
const signal = controller.signal;
const timer = setTimeout(() => {
controller.abort();
}, timeout);
const response = await fetch(url, { signal });
// If the timeout hits the above will raise AbortError.
clearTimeout(timer);
switch (response.status) {
case 200: {
const txt = await response.text();
if (skipEval) {
return txt;
}
2016-12-07 22:00:54 +00:00
return eval.call(window, txt); // eslint-disable-line no-eval
}
default:
throw new Error(`loadScript error: ${response.statusText}`);
}
}