Xojo Plugin

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

See more Azure Cloud Storage Examples

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.

Xojo Plugin

// 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.

Dim authSas As New Chilkat.AuthAzureSAS
authSas.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. 
authSas.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".
Dim success As Boolean
success = authSas.SetNonTokenParam("accountname","chilkat")

success = authSas.SetTokenParam("signedpermissions","sp","rwdlacup")
success = authSas.SetTokenParam("signedservice","ss","bfqt")
success = authSas.SetTokenParam("signedresourcetype","srt","sco")

Dim dt As New Chilkat.CkDateTime
success = dt.SetFromCurrentSystemTime()
success = authSas.SetTokenParam("signedstart","st",dt.GetAsIso8601("YYYY-MM-DDThh:mmTZD",False))

// This SAS token will be valid for 30 days.
success = dt.AddDays(30)
success = authSas.SetTokenParam("signedexpiry","se",dt.GetAsIso8601("YYYY-MM-DDThh:mmTZD",False))

success = authSas.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.
success = authSas.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.
Dim sasToken As String
sasToken = authSas.GenerateToken()
If (authSas.LastMethodSuccess <> True) Then
    System.DebugLog(authSas.LastErrorText)
    Return
End If

System.DebugLog("SAS token: " + sasToken)

// Save the SAS token to a file.
// We can then use this pre-generated token for future Azure Storage Account operations.
Dim fac As New Chilkat.FileAccess
success = fac.WriteEntireTextFile("qa_data/tokens/azureStorageAccountSas.txt",sasToken,"utf-8",False)