cryptpad/customize.dist/store.js

98 lines
2.4 KiB
JavaScript

define(function () {
/*
This module uses localStorage, which is synchronous, but exposes an
asyncronous API. This is so that we can substitute other storage
methods.
To override these methods, create another file at:
/customize/storage.js
*/
var Store = {};
// Store uses nodebacks...
Store.set = function (key, val, cb) {
localStorage.setItem(key, JSON.stringify(val));
cb();
};
// implement in alternative store
Store.setBatch = function (map, cb) {
Object.keys(map).forEach(function (key) {
localStorage.setItem(key, JSON.stringify(map[key]));
});
cb(void 0, map);
};
var safeGet = window.safeGet = function (key) {
var val = localStorage.getItem(key);
try {
return JSON.parse(val);
} catch (err) {
console.log(val);
console.error(err);
return val;
}
};
Store.get = function (key, cb) {
cb(void 0, safeGet(key));
};
// implement in alternative store
Store.getBatch = function (keys, cb) {
var res = {};
keys.forEach(function (key) {
res[key] = safeGet(key);
});
cb(void 0, res);
};
Store.remove = function (key, cb) {
localStorage.removeItem(key);
cb();
};
// implement in alternative store
Store.removeBatch = function (keys, cb) {
keys.forEach(function (key) {
localStorage.removeItem(key);
});
cb();
};
Store.keys = function (cb) {
cb(void 0, Object.keys(localStorage));
};
Store.ready = function (f) {
if (typeof(f) === 'function') {
f(void 0, Store);
}
};
var changeHandlers = Store.changeHandlers = [];
Store.change = function (f) {
if (typeof(f) !== 'function') {
throw new Error('[Store.change] callback must be a function');
}
changeHandlers.push(f);
if (changeHandlers.length === 1) {
// start listening for changes
window.addEventListener('storage', function (e) {
changeHandlers.forEach(function (f) {
f({
key: e.key,
oldValue: e.oldValue,
newValue: e.newValue,
});
});
});
}
};
return Store;
});