(SQL Server) Azure REST API Access Token

Demonstrates how to request an Azure REST API OAUTH2 access token.

Note: In order to access resources a Service Principal needs to be created in your Tenant. It is really convenient to do it via AZ CLI:

az ad sp create-for-rbac --name [APP_NAME] --password [CLIENT_SECRET]

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

    -- URL: https://login.microsoftonline.com/TENANT_ID/oauth2/token
    DECLARE @bTls int
    SELECT @bTls = 1
    DECLARE @port int
    SELECT @port = 443
    DECLARE @bAutoReconnect int
    SELECT @bAutoReconnect = 1
    DECLARE @success int
    EXEC sp_OAMethod @rest, 'Connect', @success OUT, 'login.microsoftonline.com', @port, @bTls, @bAutoReconnect
    IF @success <> 1
      BEGIN

        EXEC sp_OAGetProperty @rest, 'ConnectFailReason', @iTmp0 OUT
        PRINT 'ConnectFailReason: ' + @iTmp0
        EXEC sp_OAGetProperty @rest, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @rest
        RETURN
      END

    -- Add query params to the request.
    EXEC sp_OAMethod @rest, 'AddQueryParam', @success OUT, 'grant_type', 'client_credentials'
    EXEC sp_OAMethod @rest, 'AddQueryParam', @success OUT, 'client_id', 'APP_ID'
    EXEC sp_OAMethod @rest, 'AddQueryParam', @success OUT, 'client_secret', 'CLIENT_SECRET'
    -- Note: The resource must match the API for which you're using the access token..
    EXEC sp_OAMethod @rest, 'AddQueryParam', @success OUT, 'resource', 'https://management.azure.com/'

    DECLARE @strResponseBody nvarchar(4000)
    EXEC sp_OAMethod @rest, 'FullRequestFormUrlEncoded', @strResponseBody OUT, 'POST', '/TENANT_ID/oauth2/token'
    EXEC sp_OAGetProperty @rest, 'LastMethodSuccess', @iTmp0 OUT
    IF @iTmp0 <> 1
      BEGIN
        EXEC sp_OAGetProperty @rest, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @rest
        RETURN
      END
    DECLARE @respStatusCode int
    EXEC sp_OAGetProperty @rest, 'ResponseStatusCode', @respStatusCode OUT
    IF @respStatusCode >= 400
      BEGIN

        PRINT 'Response Status Code = ' + @respStatusCode

        PRINT 'Response Header:'
        EXEC sp_OAGetProperty @rest, 'ResponseHeader', @sTmp0 OUT
        PRINT @sTmp0

        PRINT 'Response Body:'

        PRINT @strResponseBody
        EXEC @hr = sp_OADestroy @rest
        RETURN
      END

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

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

    -- The result is an access token such as the following:

    -- {
    --   "token_type": "Bearer",
    --   "expires_in": "3600",
    --   "ext_expires_in": "3600",
    --   "expires_on": "1557864616",
    --   "not_before": "1557860716",
    --   "resource": "https://management.azure.com/",
    --   "access_token": "eyJ0eXAiOiJKV1QiL ... 20UFDDOHEyUg"
    -- }

    -- We'll save this JSON to a file for other examples to use..
    EXEC sp_OAMethod @json, 'WriteFile', @success OUT, 'qa_data/tokens/azureToken.json'

    EXEC @hr = sp_OADestroy @rest
    EXEC @hr = sp_OADestroy @json


END
GO