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storage.js
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142 lines (125 loc) · 4.1 KB
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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
define(["util"], function (util) {
var assert = util.assert;
var Deferred = util.Deferred;
var DEFAULT_SETTINGS = {
name: "",
defaultName: "",
avatar: null,
stickyShare: null,
color: null,
seenIntroDialog: false,
seenWalkthrough: false,
dontShowRtcInfo: false
};
var DEBUG_STORAGE = false;
var Storage = util.Class({
constructor: function (name, storage, prefix) {
this.name = name;
this.storage = storage;
this.prefix = prefix;
},
get: function (key, defaultValue) {
var self = this;
return Deferred(function (def) {
// Strictly this isn't necessary, but eventually I want to move to something more
// async for the storage, and this simulates that much better.
setTimeout(util.resolver(def, function () {
key = self.prefix + key;
var value = self.storage.getItem(key);
if (! value) {
value = defaultValue;
if (DEBUG_STORAGE) {
console.debug("Get storage", key, "defaults to", value);
}
} else {
value = JSON.parse(value);
if (DEBUG_STORAGE) {
console.debug("Get storage", key, "=", value);
}
}
return value;
}));
});
},
set: function (key, value) {
var self = this;
if (value !== undefined) {
value = JSON.stringify(value);
}
return Deferred(function (def) {
key = self.prefix + key;
if (value === undefined) {
self.storage.removeItem(key);
if (DEBUG_STORAGE) {
console.debug("Delete storage", key);
}
} else {
self.storage.setItem(key, value);
if (DEBUG_STORAGE) {
console.debug("Set storage", key, value);
}
}
setTimeout(def.resolve);
});
},
clear: function () {
var self = this;
var promises = [];
return Deferred((function (def) {
this.keys().then(function (keys) {
keys.forEach(function (key) {
// FIXME: technically we're ignoring the promise returned by all
// these sets:
promises.push(self.set(key, undefined));
});
util.resolveMany(promises).then(function () {
def.resolve();
});
});
}).bind(this));
},
keys: function (prefix, excludePrefix) {
// Returns a list of keys, potentially with the given prefix
var self = this;
return Deferred(function (def) {
setTimeout(util.resolver(def, function () {
prefix = prefix || "";
var result = [];
for (var i = 0; i < self.storage.length; i++) {
var key = self.storage.key(i);
if (key.indexOf(self.prefix + prefix) === 0) {
var shortKey = key.substr(self.prefix.length);
if (excludePrefix) {
shortKey = shortKey.substr(prefix.length);
}
result.push(shortKey);
}
}
return result;
}));
});
},
toString: function () {
return '[storage for ' + this.name + ']';
}
});
var namePrefix = TogetherJS.config.get("storagePrefix");
TogetherJS.config.close("storagePrefix");
var storage = Storage('localStorage', localStorage, namePrefix + ".");
storage.settings = util.mixinEvents({
defaults: DEFAULT_SETTINGS,
get: function (name) {
assert(storage.settings.defaults.hasOwnProperty(name), "Unknown setting:", name);
return storage.get("settings." + name, storage.settings.defaults[name]);
},
set: function (name, value) {
assert(storage.settings.defaults.hasOwnProperty(name), "Unknown setting:", name);
return storage.set("settings." + name, value);
}
});
storage.tab = Storage('sessionStorage', sessionStorage, namePrefix + "-session.");
return storage;
});