PnP Sample Core.CloudService problem

I'm trying to follow the instructions on https://github.com/OfficeDev/PnP/tree/master/Samples/Core.CloudServices in order to set up a web service than can talk to an Office 365 tenant. I'm trying...

Michael Blumenthal

MVP

Sep 02, 2016

I've got another question about using App-only authentication with Azure AD. Using GetAzureADAppOnlyAuthenticatedContext() is great for getting a ClientContext, but a ClientContext only helps me with using SharePoint CSOM. In the particular web service I am writing, it recieves the messageID of an email that is in Exchange Online. I want to get the subject and attachment from that email message (and then store it in SharePoint). I believe I can get the email details and content using the Graph REST API, but I need to send a bearer token in the Authorization header in the HTTP request when I do that. Can the AuthenticationManager help me with that? If not, what's the right way to get that? Is lines 43-48 of https://github.com/richdizz/MyO365BackgroundProcess/blob/master/MyO365BackgroundProcess/Program.cs a good example to follow?

Thanks,

Michael

BertJansen

Microsoft

Sep 04, 2016

Hi Michael,

Once you've a clientcontext object you can always grab the bearer token using the ExecutingWebRequest handler on the ClientContext object

        private void Cc_ExecutingWebRequest(object sender, WebRequestEventArgs e)
        {
            // Capture the OAuth access token since we want to reuse that one in our REST requests
            this.accessToken = e.WebRequestExecutor.RequestHeaders.Get("Authorization").Replace("Bearer ", "");
        }

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PnP Sample Core.CloudService problem