Visual FoxPro
How to Generate an Azure Storage Account Shared Access Signature (SAS)

Shows how to generate a Shared Access Signature (SAS) for an Azure Storage Account.
Note: This example requires Chilkat v9.5.0.65 or greater.
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Visual FoxPro
LOCAL loAuthSas
LOCAL loDt
LOCAL lcSasToken
LOCAL loFac

*  Note: Requires Chilkat v9.5.0.65 or greater.

*  This requires the Chilkat API to have been previously unlocked.
*  See Global Unlock Sample for sample code.

*  --------------------------------------------------------------------------
*  Create a Shared Access Signature (SAS) token for an Azure Storage Account.
*  --------------------------------------------------------------------------

*  See https://docs.microsoft.com/en-us/rest/api/storageservices/fileservices/constructing-an-account-sas 
*  for details regarding the Azure Storage Account SAS fields.

loAuthSas = CreateObject('Chilkat.AuthAzureSAS')
loAuthSas.AccessKey = "AZURE_ACCESS_KEY"

*  Specify the format of the string to sign.
*  Each comma character in the following string represents a LF ("\n") character.
*  The names specified in the StringToSign are replaced with the values specified
*  in the subsequent calls to SetTokenParam and SetNonTokenParam,.

*  Note: The trailing comma in the StringToSign is intentional and important. This indicates that the 
*  string to sign will end with a "\n".

*  Also note: The names in the StringToSign are case sensitive.  The names
*  specified in the 1st argument in the calls to SetNonTokenParam and SetTokenParam should
*  match a name listed in StringToSign. 
loAuthSas.StringToSign = "accountname,signedpermissions,signedservice,signedresourcetype,signedstart,signedexpiry,signedIP,signedProtocol,signedversion,"

*   The account name is "chilkat".  Use your own account name instead of "chilkat".
*   Also use your own container name instead of "mycontainer".
loAuthSas.SetNonTokenParam("accountname","chilkat")

loAuthSas.SetTokenParam("signedpermissions","sp","rwdlacup")
loAuthSas.SetTokenParam("signedservice","ss","bfqt")
loAuthSas.SetTokenParam("signedresourcetype","srt","sco")

loDt = CreateObject('Chilkat.CkDateTime')
loDt.SetFromCurrentSystemTime()
loAuthSas.SetTokenParam("signedstart","st",loDt.GetAsIso8601("YYYY-MM-DDThh:mmTZD",0))

*  This SAS token will be valid for 30 days.
loDt.AddDays(30)
loAuthSas.SetTokenParam("signedexpiry","se",loDt.GetAsIso8601("YYYY-MM-DDThh:mmTZD",0))

loAuthSas.SetTokenParam("signedProtocol","spr","https")

*   Specifiy values and query param names for each field.
*   If a field is not specified, then an empty string will be used for its value.
loAuthSas.SetTokenParam("signedversion","sv","2015-04-05")

*  Note that we did not call SetTokenParam for "signedIP".  For any omitted fields
*  the value will default to the empty string.

*  Generate the SAS token.
lcSasToken = loAuthSas.GenerateToken()
IF (loAuthSas.LastMethodSuccess <> 1) THEN
    ? loAuthSas.LastErrorText
    RELEASE loAuthSas
    RELEASE loDt
    CANCEL
ENDIF

? "SAS token: " + lcSasToken

*  Save the SAS token to a file.
*  We can then use this pre-generated token for future Azure Storage Account operations.
loFac = CreateObject('Chilkat.FileAccess')
loFac.WriteEntireTextFile("qa_data/tokens/azureStorageAccountSas.txt",lcSasToken,"utf-8",0)

RELEASE loAuthSas
RELEASE loDt
RELEASE loFac