(SQL Server) Microsoft Graph OAuth2 Client Credentials Grant Flow

Demonstrates how to get a Microsoft Graph access token using the Client Credentials Grant Flow.

You can use the OAuth 2.0 client credentials grant specified in RFC 6749, sometimes called two-legged OAuth, to access web-hosted resources by using the identity of an application. This type of grant is commonly used for server-to-server interactions that must run in the background, without immediate interaction with a user. These types of applications are often referred to as daemons or service accounts.

For more information, see https://docs.microsoft.com/en-us/azure/active-directory/develop/v2-oauth2-client-creds-grant-flow

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

-- Important: See this note about string length limitations for strings returned by sp_OAMethod calls.
--
CREATE PROCEDURE ChilkatSample
AS
BEGIN
    DECLARE @hr int
    DECLARE @iTmp0 int
    -- Important: Do not use nvarchar(max).  See the warning about using nvarchar(max).
    DECLARE @sTmp0 nvarchar(4000)
    -- This example requires the Chilkat API to have been previously unlocked.
    -- See Global Unlock Sample for sample code.

    DECLARE @http int
    -- Use "Chilkat_9_5_0.Http" for versions of Chilkat < 10.0.0
    EXEC @hr = sp_OACreate 'Chilkat.Http', @http OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        RETURN
    END

    DECLARE @req int
    -- Use "Chilkat_9_5_0.HttpRequest" for versions of Chilkat < 10.0.0
    EXEC @hr = sp_OACreate 'Chilkat.HttpRequest', @req OUT

    EXEC sp_OAMethod @req, 'AddParam', NULL, 'client_secret', 'CLIENT_SECRET'
    EXEC sp_OAMethod @req, 'AddParam', NULL, 'client_id', 'CLIENT_ID'
    -- Don't know if the scopes valid for the client credentials grant are different than the scopes for the 3-legged Authorization Code Grant...
    EXEC sp_OAMethod @req, 'AddParam', NULL, 'scope', 'https://graph.microsoft.com/.default'
    EXEC sp_OAMethod @req, 'AddParam', NULL, 'grant_type', 'client_credentials'

    -- Use your own tenant ID, for example 4d8fdd66-66d1-43b0-ae5c-e31b4b7de5cd
    DECLARE @url nvarchar(4000)
    SELECT @url = 'https://login.microsoftonline.com/TENANT_ID/oauth2/v2.0/token'
    DECLARE @resp int
    EXEC sp_OAMethod @http, 'PostUrlEncoded', @resp OUT, @url, @req
    EXEC sp_OAGetProperty @http, 'LastMethodSuccess', @iTmp0 OUT
    IF @iTmp0 <> 1
      BEGIN
        EXEC sp_OAGetProperty @http, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @http
        EXEC @hr = sp_OADestroy @req
        RETURN
      END

    DECLARE @statusCode int
    EXEC sp_OAGetProperty @resp, 'StatusCode', @statusCode OUT

    PRINT 'Response status code = ' + @statusCode

    DECLARE @json int
    -- Use "Chilkat_9_5_0.JsonObject" for versions of Chilkat < 10.0.0
    EXEC @hr = sp_OACreate 'Chilkat.JsonObject', @json OUT

    DECLARE @success int
    EXEC sp_OAGetProperty @resp, 'BodyStr', @sTmp0 OUT
    EXEC sp_OAMethod @json, 'Load', @success OUT, @sTmp0
    EXEC @hr = sp_OADestroy @resp

    EXEC sp_OASetProperty @json, 'EmitCompact', 0
    EXEC sp_OAMethod @json, 'Emit', @sTmp0 OUT
    PRINT @sTmp0

    -- Sample successful output:

    -- {
    --   "token_type": "Bearer",
    --   "expires_in": 3599,
    --   "ext_expires_in": 3599,
    --   "access_token": "eyJ0eX...K0jOERg"
    -- }

    IF @statusCode = 200
      BEGIN
        EXEC sp_OAMethod @json, 'WriteFile', @success OUT, 'qa_data/tokens/msGraphClientCredentialsToken.json'

        PRINT 'Success.'
      END
    ELSE
      BEGIN

        PRINT 'Failed.'
      END

    EXEC @hr = sp_OADestroy @http
    EXEC @hr = sp_OADestroy @req
    EXEC @hr = sp_OADestroy @json


END
GO