140 lines
3.5 KiB
JavaScript
140 lines
3.5 KiB
JavaScript
import { fromJS, List, Map } from 'immutable';
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import curry from 'lodash/curry';
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import flow from 'lodash/flow';
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import isString from 'lodash/isString';
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function isAbortControllerSupported() {
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if (typeof window !== 'undefined') {
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return !!window.AbortController;
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}
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return false;
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}
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const timeout = 60;
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function fetchWithTimeout(input, init) {
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if ((init && init.signal) || !isAbortControllerSupported()) {
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return fetch(input, init);
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}
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const controller = new AbortController();
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const timeoutId = setTimeout(() => controller.abort(), timeout * 1000);
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return fetch(input, { ...init, signal: controller.signal })
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.then(res => {
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clearTimeout(timeoutId);
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return res;
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})
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.catch(e => {
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if (e.name === 'AbortError' || e.name === 'DOMException') {
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throw new Error(`Request timed out after ${timeout} seconds`);
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}
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throw e;
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});
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}
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function decodeParams(paramsString) {
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return List(paramsString.split('&'))
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.map(s => List(s.split('=')).map(decodeURIComponent))
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.update(Map);
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}
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function fromURL(wholeURL) {
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const [url, allParamsString] = wholeURL.split('?');
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return Map({ url, ...(allParamsString ? { params: decodeParams(allParamsString) } : {}) });
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}
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function fromFetchArguments(wholeURL, options) {
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return fromURL(wholeURL).merge(
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(options ? fromJS(options) : Map()).remove('url').remove('params'),
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);
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}
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function encodeParams(params) {
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return params
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.entrySeq()
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.map(([k, v]) => `${encodeURIComponent(k)}=${encodeURIComponent(v)}`)
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.join('&');
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}
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function toURL(req) {
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return `${req.get('url')}${req.get('params') ? `?${encodeParams(req.get('params'))}` : ''}`;
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}
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function toFetchArguments(req) {
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return [
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toURL(req),
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req
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.remove('url')
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.remove('params')
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.toJS(),
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];
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}
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function maybeRequestArg(req) {
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if (isString(req)) {
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return fromURL(req);
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}
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if (req) {
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return fromJS(req);
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}
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return Map();
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}
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function ensureRequestArg(func) {
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return req => func(maybeRequestArg(req));
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}
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function ensureRequestArg2(func) {
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return (arg, req) => func(arg, maybeRequestArg(req));
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}
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// This actually performs the built request object
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const performRequest = ensureRequestArg(req => {
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const args = toFetchArguments(req);
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return fetchWithTimeout(...args);
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});
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// Each of the following functions takes options and returns another
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// function that performs the requested action on a request.
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const getCurriedRequestProcessor = flow([ensureRequestArg2, curry]);
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function getPropSetFunction(path) {
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return getCurriedRequestProcessor((val, req) => req.setIn(path, val));
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}
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function getPropMergeFunction(path) {
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return getCurriedRequestProcessor((obj, req) => req.updateIn(path, (p = Map()) => p.merge(obj)));
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}
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const withMethod = getPropSetFunction(['method']);
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const withBody = getPropSetFunction(['body']);
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const withNoCache = getPropSetFunction(['cache'])('no-cache');
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const withParams = getPropMergeFunction(['params']);
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const withHeaders = getPropMergeFunction(['headers']);
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// withRoot sets a root URL, unless the URL is already absolute
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const absolutePath = new RegExp('^(?:[a-z]+:)?//', 'i');
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const withRoot = getCurriedRequestProcessor((root, req) =>
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req.update('url', p => {
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if (absolutePath.test(p)) {
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return p;
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}
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return root && p && p[0] !== '/' && root[root.length - 1] !== '/'
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? `${root}/${p}`
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: `${root}${p}`;
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}),
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);
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export default {
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toURL,
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fromURL,
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fromFetchArguments,
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performRequest,
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withMethod,
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withBody,
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withHeaders,
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withParams,
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withRoot,
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withNoCache,
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fetchWithTimeout,
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};
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