(SQL Server) Walmart Partner API Authentication (Generate a Signature for a Request)

Demonstrates how to generate a signature for a Walmart Partner REST API call.

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 @success int

    DECLARE @consumerId nvarchar(4000)
    SELECT @consumerId = 'b68d2a72....'
    DECLARE @baseUrl nvarchar(4000)
    SELECT @baseUrl = 'https://marketplace.walmartapis.com/v2/feeds'
    -- This is your Base64 encoded private key
    DECLARE @privateEncodedStr nvarchar(4000)
    SELECT @privateEncodedStr = 'MIICeAIBADANBgkqhkiG9w0BAQEFAA......'
    DECLARE @httpMethod nvarchar(4000)
    SELECT @httpMethod = 'GET'

    -- We need a timestamp in decimal string form representing the number of milliseconds since Jan 01 1970 UTC.
    DECLARE @dt int
    -- Use "Chilkat_9_5_0.CkDateTime" for versions of Chilkat < 10.0.0
    EXEC @hr = sp_OACreate 'Chilkat.CkDateTime', @dt OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        RETURN
    END

    -- Set bLocal = 1 for a timestamp in the local timezone.  Set bLocal = 0 for a UTC timestamp.
    DECLARE @bLocal int
    SELECT @bLocal = 0
    -- This gets the timestamp in seconds, not milliseconds.
    DECLARE @timeStampVal int
    EXEC sp_OAMethod @dt, 'GetAsUnixTime', @timeStampVal OUT, @bLocal

    -- Build the string to sign.
    DECLARE @sbStringToSign int
    -- Use "Chilkat_9_5_0.StringBuilder" for versions of Chilkat < 10.0.0
    EXEC @hr = sp_OACreate 'Chilkat.StringBuilder', @sbStringToSign OUT

    EXEC sp_OAMethod @sbStringToSign, 'Append', @success OUT, @consumerId
    EXEC sp_OAMethod @sbStringToSign, 'Append', @success OUT, CHAR(10)
    EXEC sp_OAMethod @sbStringToSign, 'Append', @success OUT, @baseUrl
    EXEC sp_OAMethod @sbStringToSign, 'Append', @success OUT, CHAR(10)
    EXEC sp_OAMethod @sbStringToSign, 'Append', @success OUT, @httpMethod
    EXEC sp_OAMethod @sbStringToSign, 'Append', @success OUT, CHAR(10)
    EXEC sp_OAMethod @sbStringToSign, 'AppendInt', @success OUT, @timeStampVal
    -- We add three zero's so that the timestamp value is in milliseconds.
    -- We don't care about accuracy down to less than a second.
    -- All the server cares about is that the request was signed at the current date/time
    -- within some reasonable margin of error (to account for systems having clocks
    -- that may be slightly different).
    EXEC sp_OAMethod @sbStringToSign, 'Append', @success OUT, '000' + CHAR(10)

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

    -- Load the private key into a private key object.
    -- Note: Technically the private key is not PEM because it lacks the header/footer strings
    -- used for PEM.  However, the LoadPem method will still accept it and load it correctly.
    EXEC sp_OAMethod @privKey, 'LoadPem', @success OUT, @privateEncodedStr
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @privKey, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @dt
        EXEC @hr = sp_OADestroy @sbStringToSign
        EXEC @hr = sp_OADestroy @privKey
        RETURN
      END

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

    EXEC sp_OAMethod @rsa, 'ImportPrivateKeyObj', @success OUT, @privKey
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @rsa, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @dt
        EXEC @hr = sp_OADestroy @sbStringToSign
        EXEC @hr = sp_OADestroy @privKey
        EXEC @hr = sp_OADestroy @rsa
        RETURN
      END

    -- We want a base64 signature string.
    EXEC sp_OASetProperty @rsa, 'EncodingMode', 'base64'

    DECLARE @signatureString nvarchar(4000)
    EXEC sp_OAMethod @sbStringToSign, 'GetAsString', @sTmp0 OUT
    EXEC sp_OAMethod @rsa, 'SignStringENC', @signatureString OUT, @sTmp0, 'SHA256'
    EXEC sp_OAGetProperty @rsa, 'LastMethodSuccess', @iTmp0 OUT
    IF @iTmp0 <> 1
      BEGIN
        EXEC sp_OAGetProperty @rsa, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @dt
        EXEC @hr = sp_OADestroy @sbStringToSign
        EXEC @hr = sp_OADestroy @privKey
        EXEC @hr = sp_OADestroy @rsa
        RETURN
      END


    PRINT 'Signature String: ' + @signatureString

    EXEC @hr = sp_OADestroy @dt
    EXEC @hr = sp_OADestroy @sbStringToSign
    EXEC @hr = sp_OADestroy @privKey
    EXEC @hr = sp_OADestroy @rsa


END
GO