(C) 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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#include <C_CkAuthAzureSAS.h>
#include <C_CkDateTime.h>
#include <C_CkFileAccess.h>

void ChilkatSample(void)
    {
    HCkAuthAzureSAS authSas;
    HCkDateTime dt;
    const char *sasToken;
    HCkFileAccess fac;

    // 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.

    authSas = CkAuthAzureSAS_Create();
    CkAuthAzureSAS_putAccessKey(authSas,"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. 
    CkAuthAzureSAS_putStringToSign(authSas,"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".
    CkAuthAzureSAS_SetNonTokenParam(authSas,"accountname","chilkat");

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

    dt = CkDateTime_Create();
    CkDateTime_SetFromCurrentSystemTime(dt);
    CkAuthAzureSAS_SetTokenParam(authSas,"signedstart","st",CkDateTime_getAsIso8601(dt,"YYYY-MM-DDThh:mmTZD",FALSE));

    // This SAS token will be valid for 30 days.
    CkDateTime_AddDays(dt,30);
    CkAuthAzureSAS_SetTokenParam(authSas,"signedexpiry","se",CkDateTime_getAsIso8601(dt,"YYYY-MM-DDThh:mmTZD",FALSE));

    CkAuthAzureSAS_SetTokenParam(authSas,"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.
    CkAuthAzureSAS_SetTokenParam(authSas,"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.
    sasToken = CkAuthAzureSAS_generateToken(authSas);
    if (CkAuthAzureSAS_getLastMethodSuccess(authSas) != TRUE) {
        printf("%s\n",CkAuthAzureSAS_lastErrorText(authSas));
        CkAuthAzureSAS_Dispose(authSas);
        CkDateTime_Dispose(dt);
        return;
    }

    printf("SAS token: %s\n",sasToken);

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


    CkAuthAzureSAS_Dispose(authSas);
    CkDateTime_Dispose(dt);
    CkFileAccess_Dispose(fac);

    }