Lua

XML Inclusive Canonicalization

See more XML Digital Signatures Examples

Demonstrates how to convert XML to the Inclusive XML Canonicalization form as specified in http://www.w3.org/TR/xml-c14n/ Lua

local chilkat = require("chilkat")

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

-- The XML digital signature verification class provides utility methods for
-- XML canonicalization.  This example demonstrates how to do inclusive XML canonicalization.

local http = chilkat.Http.new()
local sbXml = chilkat.StringBuilder.new()
local canon = chilkat.XmlDSig.new()

-- Use inclusive XML canonicalization.
local canonVersion = "C14N"
local withComments = false

local url = "https://www.chilkatsoft.com/exampleData/c14n/test7.xml"
local success = http:quick_get_sb(url, sbXml)

-- This is the input XML:
-- The XML comment is referring to when exclusive XML canonicalization is applied.  With inclusive canonicalization, the namespace nodes
-- are kept, as we'll see below..

-- <doc>
-- <!-- A namespace node N is ignored if the nearest ancestor element of the node's parent element that is in the node-set has a namespace node in the node-set with the same local name and value as N. -->
--     <animal xmlns:aa="https://www.animal.com/">
--         <reptile xmlns:bb="https://www.reptile.com/">
--               <lizard xmlns="" type="african fat tailed" abc="xyz" xmlns:aa="https://www.animal.com/" />
--               <snake type="poisonous rattler" xmlns:bb="https://www.reptile.com/" >
--               </snake>
--           </reptile>
--       </animal>
-- </doc>

local xmlInclCanon = canon:canonicalize_xml(sbXml:get_as_string(), canonVersion, withComments)
print(xmlInclCanon)

-- The C14N (inclusive) canonicalization is:

-- <doc>
--
--     <animal xmlns:aa="https://www.animal.com/">
--         <reptile xmlns:bb="https://www.reptile.com/">
--               <lizard abc="xyz" type="african fat tailed"></lizard>
--               <snake type="poisonous rattler">
--               </snake>
--           </reptile>
--       </animal>
-- </doc>

-- To see the difference, let's do exclusive canonicalization..
canonVersion = "EXCL_C14N"

local xmlExclCanon = canon:canonicalize_xml(sbXml:get_as_string(), canonVersion, withComments)
print(xmlExclCanon)

-- // The C14N (exclusive) canonicalization is:
--
-- <doc>
--
--     <animal>
--         <reptile>
--               <lizard abc="xyz" type="african fat tailed"></lizard>
--               <snake type="poisonous rattler">
--               </snake>
--           </reptile>
--       </animal>
-- </doc>