0

I need to expose an API endpoint in an app/addin which published in SharePoint. My customer not giving access to SharePoint API. I can't directly make a request to SharePoint API then. So I need to create an app/addin and expose an API endpoint to receive REST request from custom third party API.

That endpoint needs to accept a file and save it in given site in SharePoint. Is this approach possible to implement? If yes how? If not then are there any other solution? TIA

Ramesh Perera
  • 53
  • 5
  • is this can be done using a provider hosted app. When I try to create a provider hosted app I have two options to select. web forms or mvc. When I choose mvc how can I create an end point to get the request from my third party server? do you have any idea. or any article related to this kind of development? – Ramesh Perera Feb 22 '23 at 05:54

1 Answers1

0

Yes, it's possible to create an app/add-in to expose an API endpoint that can receive REST requests and save a file in a SharePoint site, without directly accessing the SharePoint API. Here's an approach you could take:

  1. Create a web application that will host the API endpoint. This can be built using any web technology of your choice (e.g. ASP.NET, Node.js, Java, etc.). The endpoint should accept the file as a multipart/form-data POST request.
  2. Within the API endpoint, you can use the Microsoft Graph API to authenticate the user and access the SharePoint site. The Microsoft Graph API provides a single endpoint to access data and intelligence in Microsoft 365, and can be used to interact with SharePoint resources like files, lists, and sites.
  3. To authenticate the user, you can use the OAuth 2.0 authorization code grant flow. This involves redirecting the user to a Microsoft login page where they will enter their credentials and consent to the app accessing their SharePoint data. Once the user has authenticated, the app will receive an authorization code which can be exchanged for an access token to make API calls on behalf of the user.
  4. Once you have an access token, you can use the Microsoft Graph API to upload the file to the SharePoint site. The endpoint for uploading a file is /drives/{drive-id}/root:/{folder-path}/{filename}:/content, where {drive-id} is the ID of the SharePoint drive you want to upload to, {folder-path} is the path to the folder where you want to upload the file, and {filename} is the name of the file you want to upload. You can use the access token to authenticate the API call.
Sergiy Kostenko
  • 273
  • 1
  • 2
  • 11
  • thank you for this answer. But with this approach it's not an addin/app that can be published to SharePoint. It's a separately hosted WEB API. I need to add an app for specific site in SharePoint. As I went through the documentation, I found that there are two ways of addin creation. SharePoint hosted addins and Provider hosted addins. With the provider hosted addins can this be achieved? – Ramesh Perera Feb 20 '23 at 03:56
  • Hi, yes. It should be provider hosted app or any web app (e.g. Azure Function, Azure WebApp). – Sergiy Kostenko Feb 20 '23 at 08:44
  • could you please provide a visualized sketch of architecture that you're suggesting for this development? TIA – Ramesh Perera Feb 21 '23 at 08:12