(MFC) 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.

Chilkat C/C++ Library Downloads MS Visual C/C++ Libs

See Also: Using MFC CString in Chilkat

#include <CkAuthAzureSAS.h>
#include <CkDateTime.h>
#include <CkFileAccess.h>

void ChilkatSample(void)
    {
    CkString strOut;

    // 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.

    CkAuthAzureSAS authSas;
    authSas.put_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.put_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".
    authSas.SetNonTokenParam("accountname","chilkat");

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

    CkDateTime dt;
    dt.SetFromCurrentSystemTime();
    authSas.SetTokenParam("signedstart","st",dt.getAsIso8601("YYYY-MM-DDThh:mmTZD",false));

    // This SAS token will be valid for 30 days.
    dt.AddDays(30);
    authSas.SetTokenParam("signedexpiry","se",dt.getAsIso8601("YYYY-MM-DDThh:mmTZD",false));

    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.
    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.
    const char *sasToken = authSas.generateToken();
    if (authSas.get_LastMethodSuccess() != true) {
        strOut.append(authSas.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    strOut.append("SAS token: ");
    strOut.append(sasToken);
    strOut.append("\r\n");

    // Save the SAS token to a file.
    // We can then use this pre-generated token for future Azure Storage Account operations.
    CkFileAccess fac;
    fac.WriteEntireTextFile("qa_data/tokens/azureStorageAccountSas.txt",sasToken,"utf-8",false);


    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());

    }