C

Create an Azure Service SAS

See more Azure Cloud Storage Examples

Shows how to generate an Azure Service SAS. C

#include <C_CkAuthAzureSAS.h>
#include <C_CkDateTime.h>
#include <C_CkFileAccess.h>

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

    //  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 Service (Blob, Queue, Table, or File)
    //  -----------------------------------------------------------------------------------------------

    //  See https://docs.microsoft.com/en-us/rest/api/storageservices/create-service-sas
    //  for details.

    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. 

    //  Version 2018-11-09 and later
    //  
    //  Version 2018-11-09 adds support for the signed resource and signed blob snapshot time fields. 
    //  These must be included in the string-to-sign. To construct the string-to-sign for Blob service resources, use the following format:
    //  
    //  StringToSign = signedpermissions + "\n" +  
    //                 signedstart + "\n" +  
    //                 signedexpiry + "\n" +  
    //                 canonicalizedresource + "\n" +  
    //                 signedidentifier + "\n" +  
    //                 signedIP + "\n" +  
    //                 signedProtocol + "\n" +  
    //                 signedversion + "\n" +  
    //                 signedResource + "\n"
    //                 signedSnapshotTime + "\n" +
    //                 rscc + "\n" +  
    //                 rscd + "\n" +  
    //                 rsce + "\n" +  
    //                 rscl + "\n" +  
    //                 rsct  
    //  

    CkAuthAzureSAS_putStringToSign(authSas,"signedpermissions,signedstart,signedexpiry,canonicalizedresource,signedidentifier,signedIP,signedProtocol,signedversion,signedResource,signedSnapshotTime,rscc,rscd,rsce,rscl,rsct");

    CkAuthAzureSAS_SetTokenParam(authSas,"signedpermissions","sp","rw");

    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));

    //  The canonicalizedresouce portion of the string is a canonical path to the signed resource. It must include the service name (blob, table, queue or file) for version
    //  2021-08-06 or later, the storage account name, and the resource name, and must be URL-decoded. Names of blobs must include the blob�s container. Table names must be
    //  lower-case. The following examples show how to construct the canonicalizedresource portion of the string, depending on the type of resource.
    //  For example:
    //  URL = https://chilkat.blob.core.windows.net/mycontainer/starfish.jpg
    //  canonicalizedresource = "/blob/chilkat/mycontainer/starfish.jpg"  
    //  IMPORTANT: See https://docs.microsoft.com/en-us/rest/api/storageservices/create-service-sas for all details..
    CkAuthAzureSAS_SetNonTokenParam(authSas,"canonicalizedresource","/blob/chilkat/mycontainer/starfish.jpg");

    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","2018-11-09");

    //  Indicate that we are creating a service SAS that is limited to the blob resource.
    //  (Specify b if the shared resource is a blob. This grants access to the content and metadata of the blob.
    //   Specify c if the shared resource is a container. This grants access to the content and metadata of any blob in the container, and to the list of blobs in the container. )
    CkAuthAzureSAS_SetTokenParam(authSas,"signedResource","sr","b");

    //  Note that we did not call SetTokenParam for "signedIP", "signedSnapshotTime", "rscc", and others.  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 Service 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/azureStorageServiceSas.txt",sasToken,"utf-8",FALSE);


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

    }