(SQL Server) Xero Download Attachment for an Item (such as an Invoice)

Demonstrates how to download a particular attachment for a particular Xero item.

For more information, see https://developer.xero.com/documentation/api/attachments#GET

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

    DECLARE @success int
    EXEC sp_OAMethod @jsonToken, 'LoadFile', @success OUT, 'qa_data/tokens/xero-access-token.json'
    IF @success = 0
      BEGIN
        EXEC sp_OAGetProperty @jsonToken, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @http
        EXEC @hr = sp_OADestroy @jsonToken
        RETURN
      END

    EXEC sp_OAMethod @jsonToken, 'StringOf', @sTmp0 OUT, 'access_token'
    EXEC sp_OASetProperty @http, 'AuthToken', @sTmp0

    -- Replace the value here with an actual tenant ID obtained from this example:
    -- Get Xero Tenant IDs
    EXEC sp_OAMethod @http, 'SetRequestHeader', NULL, 'Xero-tenant-id', '83299b9e-5747-4a14-a18a-a6c94f824eb7'

    EXEC sp_OASetProperty @http, 'Accept', 'application/json'

    -- The example to list Xero attachments shows how to get attachment information.
    -- Here's a sample JSON response obtained form listing attachments:
    -- Your application can get the AttachmentID's and filenames from it.

    -- {
    --   "Id": "24bfbcb9-dec9-4d33-835c-8f165d776766",
    --   "Status": "OK",
    --   "ProviderName": "Chilkat2222",
    --   "DateTimeUTC": "\/Date(1587213296972)\/",
    --   "Attachments": [
    --     {
    --       "AttachmentID": "daf106e2-8634-4349-bfcc-86c1df0793b2",
    --       "FileName": "penguins.jpg",
    --       "Url": "https://api.xero.com/api.xro/2.0/Invoices/0032f627-3156-4d30-9b1c-4d3b994dc921/Attachments/penguins.jpg",
    --       "MimeType": "image/jpg",
    --       "ContentLength": 777835
    --     }
    --   ]
    -- }

    DECLARE @url nvarchar(4000)
    SELECT @url = 'https://api.xero.com/api.xro/2.0/{$Endpoint}/{$Guid}/Attachments/{$AttachmentId}'

    -- Endpoint can be Invoices, Receipts, CreditNotes, PurchaseOrders, etc.
    EXEC sp_OAMethod @http, 'SetUrlVar', @success OUT, 'Endpoint', 'Invoices'

    -- Guid is the ID of the item, such as the InvoiceID.
    EXEC sp_OAMethod @http, 'SetUrlVar', @success OUT, 'Guid', '0032f627-3156-4d30-9b1c-4d3b994dc921'

    -- AttachmentId is the ID of the particular attachment to be downloaded
    EXEC sp_OAMethod @http, 'SetUrlVar', @success OUT, 'AttachmentId', 'daf106e2-8634-4349-bfcc-86c1df0793b2'

    -- Download the attachment data into bd.
    DECLARE @bd int
    -- Use "Chilkat_9_5_0.BinData" for versions of Chilkat < 10.0.0
    EXEC @hr = sp_OACreate 'Chilkat.BinData', @bd OUT

    EXEC sp_OAMethod @http, 'QuickGetBd', @success OUT, @url, @bd
    IF @success = 0
      BEGIN
        EXEC sp_OAGetProperty @http, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @http
        EXEC @hr = sp_OADestroy @jsonToken
        EXEC @hr = sp_OADestroy @bd
        RETURN
      END


    EXEC sp_OAGetProperty @http, 'LastStatus', @iTmp0 OUT
    PRINT 'Response Status Code: ' + @iTmp0

    EXEC sp_OAGetProperty @http, 'LastStatus', @iTmp0 OUT
    IF @iTmp0 = 200
      BEGIN
        -- Success
        -- Save to a file..
        EXEC sp_OAMethod @bd, 'WriteFile', @success OUT, 'qa_output/penguines.jpg'
      END
    ELSE
      BEGIN
        -- Failed.  bd contains error information..
        EXEC sp_OAMethod @bd, 'GetString', @sTmp0 OUT, 'utf-8'
        PRINT @sTmp0
      END

    EXEC @hr = sp_OADestroy @http
    EXEC @hr = sp_OADestroy @jsonToken
    EXEC @hr = sp_OADestroy @bd


END
GO