使用Azure AD B2C时出现错误“Safari无法打开页面，因为地址无效”

Question

We're using Azure AD B2C with our Xamarin Forms app. I've got this working on Android and had it working on iOS . For some strange reason though I'm now getting this error when trying to login on iOS .

The login screen comes up, the user enters their username and password, but then they get the error. Looking at the Azure sign-ins for the AD I can see that Azure has successfully signed-in the user. This suggests the error is with the redirection back to the app from Azure .

I've configured the app according to this example especially step 6. Like I said though, I had this working previously. I haven't changed any of the login code since getting it working, so what else could have caused it to break?

Answer 1

You can try to add this method to your AppDelegate.cs

public override bool OpenUrl(UIApplication application, NSUrl url, string sourceApplication, NSObject annotation)
    {
        if (HandleOpenURL(application, url)){
            return true;
        }

        //return base.OpenUrl(application, url, sourceApplication, annotation);
        return false;
    }

Answer 2

I eventually found the answer by referring to this article . The pertinent section is the iOS section describing updating the info.plist file. The example article I used to integrate with Azure AD B2C (see my OP above) stated that I should use a text editor such as VS Code to update this file. However, the article here states I should update the file using Visual Studio . A comparison of the two files shows differences between the values entered into info.plist .

<key>CFBundleURLTypes</key>
<array>
    <dict>
        <key>CFBundleURLName</key>
        <string>My URL scheme</string>
        <key>CFBundleURLSchemes</key>
        <array>
            <string>msalmyapplicationid-goes-here</string>
        </array>
        <key>CFBundleTypeRole</key>
        <string>None</string>
    </dict>
</array>

This logged me in but then I immediately got the following error which kicked me out of the app.

The resource could not be loaded because the App Transport Security policy requires the use of a secure connection

I added the following to info.plist whihc has resolved the error.

<key>NSAppTransportSecurity</key>
<dict>
    <key>NSAllowsArbitraryLoads</key>
    <true/>
</dict>

All is now working and users can log into the app using iOS.