95 lines
2.0 KiB
JavaScript
95 lines
2.0 KiB
JavaScript
// A simple key value store that uses LocalStorage
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let safeLocalStorage;
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try {
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safeLocalStorage = localStorage;
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if (localStorage["disableLocalStorage"] === "true") {
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safeLocalStorage = null;
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} else {
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// makes sure we can write to the local storage
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safeLocalStorage["safeLocalStorage"] = true;
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}
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} catch (e) {
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// cookies disabled, we don't care
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safeLocalStorage = null;
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}
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const KeyValueStore = function(ctx) {
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this.context = ctx;
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};
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KeyValueStore.prototype = {
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abandonLocal() {
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if (!safeLocalStorage) {
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return;
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}
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let i = safeLocalStorage.length - 1;
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while (i >= 0) {
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let k = safeLocalStorage.key(i);
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if (k.substring(0, this.context.length) === this.context) {
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safeLocalStorage.removeItem(k);
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}
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i--;
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}
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return true;
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},
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remove(key) {
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if (!safeLocalStorage) {
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return;
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}
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return safeLocalStorage.removeItem(this.context + key);
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},
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set(opts) {
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if (!safeLocalStorage) {
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return false;
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}
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safeLocalStorage[this.context + opts.key] = opts.value;
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},
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setObject(opts) {
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this.set({ key: opts.key, value: JSON.stringify(opts.value) });
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},
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get(key) {
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if (!safeLocalStorage) {
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return null;
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}
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return safeLocalStorage[this.context + key];
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},
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getInt(key, def) {
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if (!def) {
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def = 0;
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}
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if (!safeLocalStorage) {
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return def;
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}
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const result = parseInt(this.get(key), 10);
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if (!isFinite(result)) {
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return def;
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}
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return result;
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},
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getObject(key) {
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if (!safeLocalStorage) {
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return null;
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}
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try {
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return JSON.parse(safeLocalStorage[this.context + key]);
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} catch (e) {}
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}
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};
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// API compatibility with `localStorage`
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KeyValueStore.prototype.getItem = KeyValueStore.prototype.get;
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KeyValueStore.prototype.removeItem = KeyValueStore.prototype.remove;
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KeyValueStore.prototype.setItem = function(key, value) {
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this.set({ key, value });
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};
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export default KeyValueStore;
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