@microsoft/windows-admin-center-sdk/core/base/data-store/browser-storage-data-store.js

Microsoft - Windows Admin Center Shell

import { fromEvent, of } from 'rxjs';
import { filter } from 'rxjs/operators';
import { LogLevel } from '../../diagnostics/log-level';
import { CachedDataStore } from './cached-data-store';
/**
 * Defines a single value data store using browser storage as the underlying storage mechanism
 * This is used as a base class for LocalDataStore and SessionDataStore which use LocalStorage and SessionStorage respectively
 */
export class BrowserStorageDataStore extends CachedDataStore {
    storageKey;
    storage;
    /**
     * Initializes a new instance of DataStore<T>
     */
    constructor(storageKey, storage) {
        super();
        this.storageKey = storageKey;
        this.storage = storage;
        this.listenForStorageChanges();
    }
    /**
     * Implementation to get the stored data
     */
    getData() {
        return this.storage ? of(this.storage.getItem(this.storageKey)) : of('');
    }
    /**
     * Implementation to set the stored data
     */
    setData(data) {
        this.storage?.setItem(this.storageKey, data);
        return of(null);
    }
    /**
     * Implementation to clear the stored data
     */
    clearData() {
        this.storage?.removeItem(this.storageKey);
        return of(null);
    }
    /**
     * Transforms data in preparation for storage. Default behavior is no operation
     */
    transformToStore(data) {
        return JSON.stringify(data);
    }
    /**
     * Transforms data in preparation for usage. Default behavior is no operation
     */
    transformFromStore(storedData) {
        let data = null;
        try {
            data = JSON.parse(storedData);
        }
        catch (error) {
            this.log(`Failed to parse data retrieved with storage key: ${this.storageKey}`, LogLevel.Debug);
        }
        return data;
    }
    /**
     * Listens for when other windows have modified our storage key and emits when the stored data has changed.
     */
    listenForStorageChanges() {
        this.rxjsLifetime.addSubscriptions(fromEvent(window, 'storage').pipe(filter((event) => {
            return event.storageArea === this.storage && event.key === this.storageKey;
        })).subscribe((event) => {
            const data = this.transformFromStore(event.newValue);
            this.dataChangedSubject.next(data);
        }));
    }
}

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