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/*
This file is part of GNU Anastasis
(C) 2021-2022 Anastasis SARL
GNU Anastasis is free software; you can redistribute it and/or modify it under the
terms of the GNU Affero General Public License as published by the Free Software
Foundation; either version 3, or (at your option) any later version.
GNU Anastasis is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
A PARTICULAR PURPOSE. See the GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License along with
GNU Anastasis; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
*/
/**
*
* @author Sebastian Javier Marchano (sebasjm)
*/
import { Codec } from "@gnu-taler/taler-util";
import { useEffect, useState } from "preact/hooks";
import {
ObservableMap,
browserStorageMap,
localStorageMap,
memoryMap,
} from "../utils/observable.js";
export interface LocalStorageState<Type = string> {
value?: Type;
update: (s: Type) => void;
reset: () => void;
}
const supportLocalStorage = typeof window !== "undefined";
const supportBrowserStorage =
typeof chrome !== "undefined" && typeof chrome.storage !== "undefined";
const storage: ObservableMap<string, string> = (function buildStorage() {
if (supportBrowserStorage) {
return browserStorageMap(memoryMap<string>());
} else if (supportLocalStorage) {
return localStorageMap();
} else {
return memoryMap<string>();
}
})();
//with initial value
export function useLocalStorage<Type = string>(
key: string,
options?: {
defaultValue: Type;
codec?: Codec<Type>;
},
): Required<LocalStorageState<Type>>;
//without initial value
export function useLocalStorage<Type = string>(
key: string,
options?: {
codec?: Codec<Type>;
},
): LocalStorageState<Type>;
// impl
export function useLocalStorage<Type = string>(
key: string,
options?: {
defaultValue?: Type;
codec?: Codec<Type>;
},
): LocalStorageState<Type> {
function convert(updated: string | undefined): Type | undefined {
if (updated === undefined) return options?.defaultValue; //optional
try {
return !options?.codec
? (updated as Type)
: options.codec.decode(JSON.parse(updated));
} catch (e) {
//decode error
return options?.defaultValue;
}
}
const [storedValue, setStoredValue] = useState<Type | undefined>(
(): Type | undefined => {
const prev = storage.get(key);
return convert(prev);
},
);
useEffect(() => {
return storage.onUpdate(key, () => {
const newValue = storage.get(key);
setStoredValue(convert(newValue));
});
}, []);
const setValue = (value?: Type): void => {
if (value === undefined) {
storage.delete(key);
} else {
storage.set(
key,
options?.codec ? JSON.stringify(value) : (value as string),
);
}
};
return {
value: storedValue,
update: setValue,
reset: () => {
setValue(options?.defaultValue);
},
};
}
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