(SQL Server) Microsoft Graph -- Renew Expiring Access Token (Azure AD v2.0 Endpoint)

Demonstrates how to renew an expiring access token using the refresh token. This example is for renewing an access token using the Azure AD v2.0 endpoint (not the Azure AD endpoint).

An app needs to watch for the expiration of these tokens and renew the expiring access token before the refresh token expires.

This example requires Chilkat v9.5.0.67 or greater.

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.

    -- We previously obtained an access token and saved the JSON to a file using this example:
    -- Get Access Token using Azure AD v2.0 Endpoint

    -- This example will examine the JSON and expiration date, and if near expiration will
    -- refresh the access token.

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

    DECLARE @success int
    EXEC sp_OAMethod @json, 'LoadFile', @success OUT, 'qa_data/tokens/microsoftGraph.json'
    IF @success <> 1
      BEGIN
        EXEC @hr = sp_OADestroy @json
        RETURN
      END

    -- The contents of the JSON look like this:
    -- {
    --   "token_type": "Bearer",
    --   "scope": "User.Read Mail.ReadWrite Mail.Send",
    --   "expires_in": 3600,
    --   "ext_expires_in": 0,
    --   "access_token": "EwBAA8l6B...",
    --   "refresh_token": "MCRMdbe6Cd...",
    --   "id_token": "eyJ0eXAiOiJ...",
    --   "expires_on": "1494112119"
    -- }

    -- The "expires_on" value is a Unix time.
    DECLARE @dtExpire int
    -- Use "Chilkat_9_5_0.CkDateTime" for versions of Chilkat < 10.0.0
    EXEC @hr = sp_OACreate 'Chilkat.CkDateTime', @dtExpire OUT

    EXEC sp_OAMethod @json, 'IntOf', @iTmp0 OUT, 'expires_on'
    EXEC sp_OAMethod @dtExpire, 'SetFromUnixTime', @success OUT, 0, @iTmp0

    -- If this date/time expires within 10 minutes of the current system time, refresh the token.
    EXEC sp_OAMethod @dtExpire, 'ExpiresWithin', @iTmp0 OUT, 10, 'minutes'
    IF @iTmp0 <> 1
      BEGIN

        PRINT 'No need to refresh, the access token won''t expire within the next 10 minutes.'
        EXEC @hr = sp_OADestroy @json
        EXEC @hr = sp_OADestroy @dtExpire
        RETURN
      END

    -- OK, we need to refresh the access token by sending a POST like this:
    -- 

    -- 	POST https://login.microsoftonline.com/common/oauth2/v2.0/token HTTP/1.1
    -- 	Host: login.microsoftonline.com
    -- 	Content-Type: application/x-www-form-urlencoded
    -- 	Content-Length: ***
    -- 
    -- 	grant_type=refresh_token
    -- 	&redirect_uri=http%3A%2F%2Flocalhost%3A3017%2F
    -- 	&client_id=8b8539cd-7b75-427f-bef1-4a6264fd4940
    -- 	&client_secret=PJW3dznGfyNSm3rM9aHeXWGKsTMepKXT1Eqy45XXdU4%3D
    -- 	&refresh_token=AAABAAAAvPM1KaPlrEqdFSBzjqfTGM74--...

    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, 'grant_type', 'refresh_token'
    EXEC sp_OAMethod @req, 'AddParam', NULL, 'redirect_uri', 'http://localhost:3017/'
    EXEC sp_OAMethod @req, 'AddParam', NULL, 'client_id', 'MICROSOFT-GRAPH-CLIENT-ID'
    EXEC sp_OAMethod @req, 'AddParam', NULL, 'client_secret', 'MICROSOFT-GRAPH-CLIENT-SECRET'
    EXEC sp_OAMethod @json, 'StringOf', @sTmp0 OUT, 'refresh_token'
    EXEC sp_OAMethod @req, 'AddParam', NULL, 'refresh_token', @sTmp0

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

    DECLARE @resp int
    EXEC sp_OAMethod @http, 'PostUrlEncoded', @resp OUT, 'https://login.microsoftonline.com/common/oauth2/v2.0/token', @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 @json
        EXEC @hr = sp_OADestroy @dtExpire
        EXEC @hr = sp_OADestroy @req
        EXEC @hr = sp_OADestroy @http
        RETURN
      END

    -- Load the JSON response.
    EXEC sp_OAGetProperty @resp, 'BodyStr', @sTmp0 OUT
    EXEC sp_OAMethod @json, 'Load', @success OUT, @sTmp0
    EXEC sp_OASetProperty @json, 'EmitCompact', 0

    -- Show the JSON response.
    EXEC sp_OAMethod @json, 'Emit', @sTmp0 OUT
    PRINT @sTmp0


    EXEC sp_OAGetProperty @resp, 'StatusCode', @iTmp0 OUT
    PRINT 'Response status code: ' + @iTmp0

    -- If the response status code is not 200, then it's an error.
    EXEC sp_OAGetProperty @resp, 'StatusCode', @iTmp0 OUT
    IF @iTmp0 <> 200
      BEGIN
        EXEC @hr = sp_OADestroy @json
        EXEC @hr = sp_OADestroy @dtExpire
        EXEC @hr = sp_OADestroy @req
        EXEC @hr = sp_OADestroy @http
        RETURN
      END

    EXEC @hr = sp_OADestroy @resp

    -- If an "expires_on" member does not exist, then add the JSON member by
    -- getting the current system date/time and adding the "expires_in" seconds.
    -- This way we'll know when the token expires.
    EXEC sp_OAMethod @json, 'HasMember', @iTmp0 OUT, 'expires_on'
    IF @iTmp0 <> 1
      BEGIN
        EXEC sp_OAMethod @dtExpire, 'SetFromCurrentSystemTime', @success OUT
        EXEC sp_OAMethod @json, 'IntOf', @iTmp0 OUT, 'expires_in'
        EXEC sp_OAMethod @dtExpire, 'AddSeconds', @success OUT, @iTmp0
        EXEC sp_OAMethod @dtExpire, 'GetAsUnixTimeStr', @sTmp0 OUT, 0
        EXEC sp_OAMethod @json, 'AppendString', @success OUT, 'expires_on', @sTmp0
      END

    -- Save the refreshed access token JSON to a file for future requests.
    DECLARE @fac int
    -- Use "Chilkat_9_5_0.FileAccess" for versions of Chilkat < 10.0.0
    EXEC @hr = sp_OACreate 'Chilkat.FileAccess', @fac OUT

    EXEC sp_OAMethod @json, 'Emit', @sTmp0 OUT
    EXEC sp_OAMethod @fac, 'WriteEntireTextFile', @success OUT, 'qa_data/tokens/microsoftGraph.json', @sTmp0, 'utf-8', 0

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


END
GO