External Auth

Improvements to better support external auth providers is tracked in issue 163

While there are currently no plugins to work with external auth providers, it is possible to use the existing APIs to provision and sign in a user that has already been authenticated by your custom code. The following example takes a pre-authenticated username and signs it in, provisioning a new user account if one does not already exist:

public async Task SignMemberInAsync(string username)
{
    // Because the user is not signed in yet we need to elevate permissions here,
    // otherwise the anonymous user will be used and a permission exception will be thrown
    var existingUser = await _advancedContentRepository
        .WithElevatedPermissions()
        .Users()
        .GetByUsername<MemberUserArea>(username)
        .AsMicroSummary()
        .ExecuteAsync();

    int userId;

    if (existingUser == null)
    {
        // If we haven't signed in with this user before, we'll provision a new user account
        // to match the SSO user account.
        userId = await _advancedContentRepository
            .WithElevatedPermissions()
            .Users()
            .AddAsync(new AddUserCommand()
            {
                UserAreaCode = MemberUserArea.Code,
                RoleCode = MemberRole.Code,
                Username = username
            });
    }
    else
    {
        // If the user already exists, we sign in using that UserId
        userId = existingUser.UserId;
    }

    await _advancedContentRepository
        .Users()
        .Authentication()
        .SignInAuthenticatedUserAsync(new SignInAuthenticatedUserCommand()
        {
            UserId = userId,
            RememberUser = true
        });
}