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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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/. */
+
+#include "OSReauthenticator.h"
+
+#include "nsCocoaUtils.h"
+
+using namespace mozilla;
+
+#include <CoreFoundation/CoreFoundation.h>
+#include <LocalAuthentication/LocalAuthentication.h>
+
+static const int32_t kPasswordNotSetErrorCode = -1000;
+
+nsresult ReauthenticateUserMacOS(const nsAString& aPrompt,
+ /* out */ bool& aReauthenticated,
+ /* out */ bool& aIsBlankPassword) {
+ // The idea here is that we ask to be authorized to unlock the user's session.
+ // This should cause a prompt to come up for the user asking them for their
+ // password. If they correctly enter it, we'll set aReauthenticated to true.
+
+ LAContext* context = [[LAContext alloc] init];
+ NSString* prompt = nsCocoaUtils::ToNSString(aPrompt);
+
+ dispatch_semaphore_t sema = dispatch_semaphore_create(0);
+
+ __block BOOL biometricSuccess = NO; // mark variable r/w across the block
+ __block BOOL errorPasswordNotSet = NO; // mark variable r/w across the block
+
+ // Note: This is an async callback in an already-async Promise chain.
+ [context evaluatePolicy:LAPolicyDeviceOwnerAuthentication
+ localizedReason:prompt
+ reply:^(BOOL success, NSError* error) {
+ dispatch_async(dispatch_get_main_queue(), ^{
+ // error is not particularly useful in this context, and
+ // we have no mechanism to really return it. We could
+ // use it to set the nsresult, but this is a best-effort
+ // mechanism and there's no particular case for
+ // propagating up XPCOM. The one exception being a user
+ // account that has no passcode set, which we handle
+ // below.
+ errorPasswordNotSet =
+ error && [error code] == kPasswordNotSetErrorCode;
+ biometricSuccess = success || errorPasswordNotSet;
+ dispatch_semaphore_signal(sema);
+ });
+ }];
+
+ // What we want to do here is convert this into a blocking call, since
+ // our calling methods expect us to block and set aReauthenticated on return.
+ dispatch_semaphore_wait(sema, DISPATCH_TIME_FOREVER);
+ dispatch_release(sema);
+ sema = NULL;
+
+ aReauthenticated = biometricSuccess;
+ aIsBlankPassword = errorPasswordNotSet;
+
+ [context release];
+ return NS_OK;
+}