66 lines
1.3 KiB
JavaScript
66 lines
1.3 KiB
JavaScript
function canAccessProperty(base, property) {
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let safe;
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try {
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safe = Boolean(base[property]);
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} catch (error) {
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safe = false;
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}
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return safe;
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}
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function canCallFunction(base, functionName, ...args) {
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let safe = true;
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try {
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base[functionName](...args);
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} catch (error) {
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safe = false;
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}
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return safe;
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}
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/**
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* Determines if `window.localStorage` is available and
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* can be written to and read from.
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*
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* Important: This is not a guarantee that
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* `localStorage.setItem` will work in all cases.
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*
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* `setItem` can still throw exceptions and should be
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* surrounded with a try/catch where used.
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*
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* See: https://developer.mozilla.org/en-US/docs/Web/API/Storage/setItem#exceptions
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*/
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function canUseLocalStorage() {
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let safe;
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const TEST_KEY = 'canUseLocalStorage';
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const TEST_VALUE = 'true';
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safe = canAccessProperty(window, 'localStorage');
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if (!safe) return safe;
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safe = canCallFunction(window.localStorage, 'setItem', TEST_KEY, TEST_VALUE);
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if (safe) window.localStorage.removeItem(TEST_KEY);
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return safe;
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}
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/**
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* Determines if `window.crypto` is available.
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*/
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function canUseCrypto() {
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return window.crypto?.subtle !== undefined;
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}
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const AccessorUtilities = {
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canUseLocalStorage,
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canUseCrypto,
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};
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export default AccessorUtilities;
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