shr-buttons/src/js/utils/storage.js

Simple, customizable sharing buttons

// ==========================================================================
// Plyr storage
// ==========================================================================

import is from './is';
import { extend } from './objects';

class Storage {
    constructor(key, ttl, enabled = true) {
        this.enabled = enabled && Storage.supported;
        this.key = key;
        this.ttl = ttl;
    }

    // Check for actual support (see if we can use it)
    static get supported() {
        try {
            if (!('localStorage' in window)) {
                return false;
            }

            const test = '___test';

            // Try to use it (it might be disabled, e.g. user is in private mode)
            // see: https://github.com/sampotts/plyr/issues/131
            window.localStorage.setItem(test, test);
            window.localStorage.removeItem(test);

            return true;
        } catch (e) {
            return false;
        }
    }

    get(key) {
        if (!Storage.supported || !this.enabled) {
            return null;
        }

        const store = window.localStorage.getItem(this.key);

        if (is.empty(store)) {
            return null;
        }

        // Check TTL
        const ttl = window.localStorage.getItem(`${this.key}_ttl`);

        if (is.empty(ttl) || ttl < Date.now()) {
            return null;
        }

        const json = JSON.parse(store);

        return is.string(key) && key.length ? json[key] : json;
    }

    set(object) {
        // Bail if we don't have localStorage support or it's disabled
        if (!Storage.supported || !this.enabled) {
            return;
        }

        // Can only store objectst
        if (!is.object(object)) {
            return;
        }

        // Get current storage
        let storage = this.get();

        // Default to empty object
        if (is.empty(storage)) {
            storage = {};
        }

        // Update the working copy of the values
        extend(storage, object);

        // Update storage and TTL record
        window.localStorage.setItem(this.key, JSON.stringify(storage));
        window.localStorage.setItem(`${this.key}_ttl`, Date.now() + this.ttl);
    }
}

export default Storage;