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

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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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// 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("CkAuthAzureSAS")
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("CkDateTime")
loDt.SetFromCurrentSystemTime()
loAuthSas.SetTokenParam("signedstart","st",loDt.GetAsIso8601("YYYY-MM-DDThh:mmTZD",.F.))

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

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 <> .T.) then
    ? loAuthSas.LastErrorText
    release loAuthSas
    release loDt
    return
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("CkFileAccess")
loFac.WriteEntireTextFile("qa_data/tokens/azureStorageAccountSas.txt",lcSasToken,"utf-8",.F.)


release loAuthSas
release loDt
release loFac