Extern C For Mac App

3 min readJun 4, 2021

Extern C For Mac Application
Extern C For Mac Apps

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A web browser is required for interactive authentication. On iOS and macOS 10.15+, the Microsoft Authentication Library (MSAL) uses the system web browser by default (which might appear on top of your app) to do interactive authentication to sign in users. Using the system browser has the advantage of sharing the Single Sign On (SSO) state with other applications and with web applications.

You can change the experience by customizing the configuration to other options for displaying web content, such as:

For iOS only:

For iOS and macOS:

WKWebView.

MSAL for macOS only supports WKWebView on older OS versions. ASWebAuthenticationSession is only supported on macOS 10.15 and above.

System browsers

For iOS, ASWebAuthenticationSession, SFAuthenticationSession, and SFSafariViewController are considered system browsers. For macOS, only ASWebAuthenticationSession is available. In general, system browsers share cookies and other website data with the Safari browser application.

By default, MSAL will dynamically detect iOS version and select the recommended system browser available on that version. On iOS 12+ it will be ASWebAuthenticationSession.

Default configuration for iOS

VersionWeb browseriOS 12+ASWebAuthenticationSessioniOS 11SFAuthenticationSessioniOS 10SFSafariViewController

Default configuration for macOS

Extern C For Mac Application

VersionWeb browsermacOS 10.15+ASWebAuthenticationSessionother versionsWKWebView

Developers can also select a different system browser for MSAL apps:

SFAuthenticationSession is the iOS 11 version of ASWebAuthenticationSession.
SFSafariViewController is more general purpose and provides an interface for browsing the web and can be used for login purposes as well. In iOS 9 and 10, cookies and other website data are shared with Safari--but not in iOS 11 and later.

In-app browser

WKWebView is an in-app browser that displays web content. It doesn’t share cookies or web site data with other WKWebView instances, or with the Safari browser. WKWebView is a cross-platform browser that is available for both iOS and macOS.

Cookie sharing and Single sign-on (SSO) implications

The browser you use impacts the SSO experience because of how they share cookies. The following tables summarize the SSO experiences per browser.

TechnologyBrowser TypeiOS availabilitymacOS availabilityShares cookies and other dataMSAL availabilitySSOASWebAuthenticationSessionSystemiOS12 and upmacOS 10.15 and upYesiOS and macOS 10.15+w/ Safari instancesSFAuthenticationSessionSystemiOS11 and upN/AYesiOS onlyw/ Safari instancesSFSafariViewControllerSystemiOS11 and upN/ANoiOS onlyNo**SFSafariViewControllerSystemiOS10N/AYesiOS onlyw/ Safari instancesWKWebViewIn-appiOS8 and upmacOS 10.10 and upNoiOS and macOSNo**

** For SSO to work, tokens need to be shared between apps. This requires a token cache, or broker application, such as Microsoft Authenticator for iOS.

Change the default browser for the request

You can use an in-app browser, or a specific system browser depending on your UX requirements, by changing the following property in MSALWebviewParameters:

Extern C For Mac Apps

Change per interactive request

Each request can be configured to override the default browser by changing the MSALInteractiveTokenParameters.webviewParameters.webviewType property before passing it to the acquireTokenWithParameters:completionBlock: API.

Additionally, MSAL supports passing in a custom WKWebView by setting the MSALInteractiveTokenParameters.webviewParameters.customWebView property.

For example:

Objective-C

Swift

If you use a custom webview, notifications are used to indicate the status of the web content being displayed, such as: