Lua

Create an Azure Service SAS

See more Azure Cloud Storage Examples

Shows how to generate an Azure Service SAS. Lua

local chilkat = require("chilkat")

-- 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.

local authSas = chilkat.AuthAzureSAS.new()
authSas.access_key = "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
--

authSas.string_to_sign = "signedpermissions,signedstart,signedexpiry,canonicalizedresource,signedidentifier,signedIP,signedProtocol,signedversion,signedResource,signedSnapshotTime,rscc,rscd,rsce,rscl,rsct"

authSas:set_token_param("signedpermissions", "sp", "rw")

local dt = chilkat.DateTime.new()
dt:set_from_current_system_time()
authSas:set_token_param("signedstart", "st", dt:get_as_iso8601("YYYY-MM-DDThh:mmTZD", false))

-- This SAS token will be valid for 30 days.
dt:add_days(30)
authSas:set_token_param("signedexpiry", "se", dt:get_as_iso8601("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..
authSas:set_non_token_param("canonicalizedresource", "/blob/chilkat/mycontainer/starfish.jpg")

authSas:set_token_param("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:set_token_param("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. )
authSas:set_token_param("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.
local sasToken = authSas:generate_token()
if not authSas.last_method_success then
    print(authSas.last_error_text)
    return
end

print("SAS token: " .. sasToken)

-- Save the SAS Service token to a file.
-- We can then use this pre-generated token for future Azure Storage Account operations.
local fac = chilkat.FileAccess.new()
fac:write_entire_text_file("qa_data/tokens/azureStorageServiceSas.txt", sasToken, "utf-8", false)