%dw 2.0
output application/xml inlineCloseOn="empty"
var removeAttribute = (element,attrName) ->
element mapObject (value, key) -> {
// Pass the name of the key of the input object,
// for example, whether the key is "users" or "user",
// and use @() to remap the XML attributes.
(key) @(
(
// If the element contains attributes (key.@?),
// remove any attribute that has the provided key,
// "password".
if (key.@?)
(key.@ - attrName)
// Otherwise, do nothing.
else {}
)
) :
// If the value of the input object contains one or
// more objects, apply removeAttribute to remove any
// attribute with the key "password" from those objects.
if (value is Object)
removeAttribute(value, attrName)
// Otherwise, return the value of the input object.
else value
}
---
removeAttribute(payload, "password")
Remove Specified XML Attributes
You might want to remove specific attributes from within an XML tag that are known to contain sensitive data. The DataWeave example defines a function in the DataWeave header that removes a specific XML attribute from the passed element and its children. Before you begin, note that 2.x versions of DataWeave are used by Mule 4 apps. For DataWeave in Mule 3 apps, refer to DataWeave version 1.2 examples. For other DataWeave versions, you can use the version selector in the DataWeave table of contents.
This example uses:
-
mapObject
to go through each element. -
@
to refer to the attributes in an XML element. -
if
andelse
to conditionally only list XML attributes when they are present, and also to only recursively call the function when a child element is an object. -
is
to check if each child is of typeObject
. -
-
to remove an element from the list of XML attributes. -
inlineCloseOn="empty"
on the output directive, so that the output XML displays self-closing tags when there are no values.
If the parent users
object or child user
objects within the input contain
an attribute with the key password
, removeAttributes
removes that attribute
from the object.
<users>
<user username="Julian" password="1234"/>
<user username="Mariano" password="4321"/>
</users>
<?xml version='1.0' encoding='US-ASCII'?>
<users>
<user username="Julian"/>
<user username="Mariano"/>
</users>