1 files changed, 107 insertions, 0 deletions
diff --git a/toolkit/modules/sessionstore/Utils.jsm b/toolkit/modules/sessionstore/Utils.jsm
new file mode 100644
index 0000000000..863bca6f51
--- /dev/null
+++ b/toolkit/modules/sessionstore/Utils.jsm
@@ -0,0 +1,107 @@
+/* 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/. */
+
+"use strict";
+
+this.EXPORTED_SYMBOLS = ["Utils"];
+
+const Cu = Components.utils;
+const Cc = Components.classes;
+const Ci = Components.interfaces;
+
+Cu.import("resource://gre/modules/Services.jsm", this);
+Cu.import("resource://gre/modules/XPCOMUtils.jsm", this);
+
+XPCOMUtils.defineLazyServiceGetter(this, "serializationHelper",
+                                   "@mozilla.org/network/serialization-helper;1",
+                                   "nsISerializationHelper");
+
+function debug(msg) {
+  Services.console.logStringMessage("Utils: " + msg);
+}
+
+this.Utils = Object.freeze({
+  makeURI: function (url) {
+    return Services.io.newURI(url, null, null);
+  },
+
+  makeInputStream: function (aString) {
+    let stream = Cc["@mozilla.org/io/string-input-stream;1"].
+                 createInstance(Ci.nsISupportsCString);
+    stream.data = aString;
+    return stream; // XPConnect will QI this to nsIInputStream for us.
+  },
+
+  /**
+   * Returns true if the |url| passed in is part of the given root |domain|.
+   * For example, if |url| is "www.mozilla.org", and we pass in |domain| as
+   * "mozilla.org", this will return true. It would return false the other way
+   * around.
+   */
+  hasRootDomain: function (url, domain) {
+    let host;
+
+    try {
+      host = this.makeURI(url).host;
+    } catch (e) {
+      // The given URL probably doesn't have a host.
+      return false;
+    }
+
+    let index = host.indexOf(domain);
+    if (index == -1)
+      return false;
+
+    if (host == domain)
+      return true;
+
+    let prevChar = host[index - 1];
+    return (index == (host.length - domain.length)) &&
+           (prevChar == "." || prevChar == "/");
+  },
+
+  shallowCopy: function (obj) {
+    let retval = {};
+
+    for (let key of Object.keys(obj)) {
+      retval[key] = obj[key];
+    }
+
+    return retval;
+  },
+
+  /**
+   * Serialize principal data.
+   *
+   * @param {nsIPrincipal} principal The principal to serialize.
+   * @return {String} The base64 encoded principal data.
+   */
+  serializePrincipal(principal) {
+    if (!principal)
+      return null;
+
+    return serializationHelper.serializeToString(principal);
+  },
+
+  /**
+   * Deserialize a base64 encoded principal (serialized with
+   * Utils::serializePrincipal).
+   *
+   * @param {String} principal_b64 A base64 encoded serialized principal.
+   * @return {nsIPrincipal} A deserialized principal.
+   */
+  deserializePrincipal(principal_b64) {
+    if (!principal_b64)
+      return null;
+
+    try {
+      let principal = serializationHelper.deserializeObject(principal_b64);
+      principal.QueryInterface(Ci.nsIPrincipal);
+      return principal;
+    } catch (e) {
+      debug(`Failed to deserialize principal_b64 '${principal_b64}' ${e}`);
+    }
+    return null;
+  }
+});