Lua

Azure Storage: Upload Empty File to Block Blob

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Demonstrates how to create an empty block blob in Azure Storage. Lua

local chilkat = require("chilkat")

-- Azure Blob Service Example: Demonstrates how to create an empty block blob.
-- See also: https://msdn.microsoft.com/en-us/library/azure/dd179451.aspx

-- This example requires the Chilkat API to have been previously unlocked.
-- See Global Unlock Sample for sample code.

local rest = chilkat.Rest.new()

-- Connect to the Azure Storage Blob Service
local bTls = true
local port = 443
local bAutoReconnect = true
-- In this example, the storage account name is "chilkat".
local success = rest:connect("chilkat.blob.core.windows.net", port, bTls, bAutoReconnect)
if not success then
    print(rest.last_error_text)
    return
end

-- Provide Azure Cloud credentials for the REST call.
local azAuth = chilkat.AuthAzureStorage.new()
azAuth.access_key = "AZURE_ACCESS_KEY"
-- The account name used here should match the 1st part of the domain passed in the call to Connect (above).
azAuth.account = "chilkat"
azAuth.scheme = "SharedKey"
azAuth.service = "Blob"
-- This causes the "x-ms-version: 2021-08-06" header to be automatically added.
azAuth.xms_version = "2021-08-06"
success = rest:set_auth_azure_storage(azAuth)

-- Note: The application does not need to explicitly set the following
-- headers: Content-Length, x-ms-date, Authorization.  These headers
-- are automatically set by Chilkat.

-- IMPORTANT: Make sure to set the x-ms-blob-type header:
success = rest:add_header("x-ms-blob-type", "BlockBlob")

-- To create an empty blob, upload a zero-length string.
local responseStr = rest:full_request_string("PUT", "/mycontainer/empty.txt", "")
if not rest.last_method_success then
    print(rest.last_error_text)
    return
end

-- When successful, the Azure Storage service will respond with a 201 response status code,
-- with no response body.

if rest.response_status_code ~= 201 then
    -- Examine the request/response to see what happened.
    print("response status code = " .. rest.response_status_code)
    print("response status text = " .. rest.response_status_text)
    print("response header: " .. rest.response_header)
    print("response body (if any): " .. responseStr)
    print("---")
    print("LastRequestStartLine: " .. rest.last_request_start_line)
    print("LastRequestHeader: " .. rest.last_request_header)
    return
end

print("Success.")