Adding Spfx Web Parts to Modern site Pages using PNP CSOM in Azure AD Apps

Question

I had Create a web application with Azure AD authentication using Azure AD Application. I had granted all permission for SharePoint Online,Graph Api and Active Directory to the App for provisioning Site collections(creation and Deletion) which is working fine.

Now i am trying to add Spfx Web part to a Modern page. I followed the Msdn article Customizing Modern site pages which is working fine with user Context.

But in my web application i am accessing the site collections through tenant Context(https://tenant-admin.sharepoint.com) using access tokens from the Azure AD App. Now i want to know how to add spfx webpart to modern page of a specific site collection using the tenant context

Below is the code that i am trying to add the spfx webpart to modern pages using Tenant context.

 var tenant = new Tenant(spcontext);
                spcontext.Load(tenant);
                spcontext.ExecuteQuery();
                var site = tenant.GetSiteByUrl(webUrl);
                spcontext.Load(site);
                spcontext.Load(site.RootWeb);
                spcontext.ExecuteQuery();
                string pageName = "mypage.aspx";
                ClientSidePage page = ClientSidePage.Load(spcontext, pageName);
                var components = page.AvailableClientSideComponents();
                string wpName = "Intranet Manager";
                List<string> componentsnames = components.Select(k => k.Name).ToList();
                var webPartToAdd = components.Where(wp => wp.ComponentType == 1 && wp.Name == wpName).FirstOrDefault();
                if (webPartToAdd != null)
                {
                    ClientSideWebPart clientWp = new ClientSideWebPart(webPartToAdd) { Order = -1 };
                    page.AddControl(clientWp);
                }
                page.Save(pageName);
                spcontext.ExecuteQuery();

I am getting the below error

"Site https://tenant-admin.sharepoint.com does not have a sitepages library and therefore this page can't be a client side page.

Since I am using the tenant context. Can anyone guide me in right way?

Update:

Methods using for getting the Access token in the MVC Web Application. Here I am passing https://tenant-admin.sharepoint.com as the parameter for the method GetSharePointContext

public ClientContext GetSharePointContext(string SiteUrl)
{
    ClientContext spContext = null;
    try
    {
        Task<string> result = Task.Run<string>(() => GetAccessToken(SiteUrl));
        result.Wait();
        if (result != null)
        {
            spContext = TokenHelper.GetClientContextWithAccessToken(SiteUrl, result.Result);
        }

    }
    catch (System.Exception ex)
    {

    }
    return spContext;
}


  public async Task<string> GetAccessToken(string siteurl)
        {
            AuthenticationResult authenticationResult = null;
            string signedInUserID = ClaimsPrincipal.Current.FindFirst(ClaimTypes.NameIdentifier).Value;
            string tenantID = ClaimsPrincipal.Current.FindFirst("http://schemas.microsoft.com/identity/claims/tenantid").Value;
            string userObjectID = ClaimsPrincipal.Current.FindFirst("http://schemas.microsoft.com/identity/claims/objectidentifier").Value;
            // get a token for the Graph without triggering any user interaction (from the cache, via multi-resource refresh token, etc)
            ClientCredential clientcred = new ClientCredential(clientId, appKey);
            try
            {
                Microsoft.IdentityModel.Clients.ActiveDirectory.AuthenticationContext authenticationContext = new Microsoft.IdentityModel.Clients.ActiveDirectory.AuthenticationContext("https://login.microsoftonline.com/" + tenantID, new ADALTokenCache(signedInUserID));
                authenticationResult = await authenticationContext.AcquireTokenSilentAsync(siteurl, clientcred, new UserIdentifier(userObjectID, UserIdentifierType.UniqueId));
                return authenticationResult.AccessToken;
            }
            catch (System.Exception ex)
            {
                return null;
            }
        }

Answer 1

In the samples in the articles below, when creating a new client-side page, finally save the page to the site pages library.

https://docs.microsoft.com/en-us/sharepoint/dev/solution-guidance/modern-experience-customizations-customize-pages

And there is no sitepages library in the site https://tenant-admin.sharepoint.com, it will throw the error.

So we should use the user context not the tenant context.

Answer 2

As mentioned by Amy, you need to switch the context to a site collection context from the tenant context.

The sharepoint admin site doesn't have the site pages library, so its throwing that error.

You can make use of PnP's clone method to "take over" the security context of existing client context instance as below:

Modify your code as below:

var tenant = new Tenant(spcontext);
spcontext.Load(tenant);
spcontext.ExecuteQuery();
var site = tenant.GetSiteByUrl(webUrl);
spcontext.Load(site);
spcontext.Load(site.RootWeb);
spcontext.ExecuteQuery();

using (ClientContext newSiteContext = spcontext.Clone(webUrl))
{
    string pageName = "mypage.aspx";
    ClientSidePage page = ClientSidePage.Load(newSiteContext, pageName);
    var components = page.AvailableClientSideComponents();
    string wpName = "Intranet Manager";
    List<string> componentsnames = components.Select(k => k.Name).ToList();
    var webPartToAdd = components.Where(wp => wp.ComponentType == 1 && wp.Name == wpName).FirstOrDefault();
    if (webPartToAdd != null)
    {
        ClientSideWebPart clientWp = new ClientSideWebPart(webPartToAdd) { Order = -1 };
        page.AddControl(clientWp);
    }
    page.Save(pageName);
    newSiteContext.ExecuteQuery();
}