зеркало из https://github.com/mozilla/gecko-dev.git
63 строки
2.2 KiB
JavaScript
63 строки
2.2 KiB
JavaScript
/**
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* Any copyright is dedicated to the Public Domain.
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* http://creativecommons.org/publicdomain/zero/1.0/
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*/
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const NS_ERROR_STORAGE_BUSY = SpecialPowers.Cr.NS_ERROR_STORAGE_BUSY;
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loadScript("dom/quota/test/common/global.js");
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function clearAllDatabases(callback) {
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let qms = SpecialPowers.Services.qms;
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let principal = SpecialPowers.wrap(document).nodePrincipal;
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let request = qms.clearStoragesForPrincipal(principal);
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let cb = SpecialPowers.wrapCallback(callback);
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request.callback = cb;
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return request;
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}
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// SimpleDB connections and SpecialPowers wrapping:
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//
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// SpecialPowers provides a SpecialPowersHandler Proxy mechanism that lets our
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// content-privileged code borrow its chrome-privileged principal to access
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// things we shouldn't be able to access. The proxies wrap their returned
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// values, so once we have something wrapped we can rely on returned objects
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// being wrapped as well. The proxy will also automatically unwrap wrapped
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// arguments we pass in. However, we need to invoke wrapCallback on callback
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// functions so that the arguments they receive will be wrapped because the
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// proxy does not automatically wrap content-privileged functions.
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//
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// Our use of (wrapped) SpecialPowers.Cc results in getSimpleDatabase()
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// producing a wrapped nsISDBConnection instance. The nsISDBResult instances
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// exposed on the (wrapped) nsISDBRequest are also wrapped.
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// In particular, the wrapper takes responsibility for automatically cloning
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// the ArrayBuffer returned by nsISDBResult.getAsArrayBuffer into the content
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// compartment (rather than wrapping it) so that constructing a Uint8Array
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// from it will succeed.
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function getSimpleDatabase() {
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let connection = SpecialPowers.Cc[
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"@mozilla.org/dom/sdb-connection;1"
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].createInstance(SpecialPowers.Ci.nsISDBConnection);
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let principal = SpecialPowers.wrap(document).nodePrincipal;
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connection.init(principal);
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return connection;
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}
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async function requestFinished(request) {
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await new Promise(function (resolve) {
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request.callback = SpecialPowers.wrapCallback(function () {
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resolve();
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});
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});
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if (request.resultCode != SpecialPowers.Cr.NS_OK) {
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throw new RequestError(request.resultCode, request.resultName);
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}
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return request.result;
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}
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