W-18359576 dw flex gr

gateway/1.10/modules/ROOT/pages/policies-flex-dataweave-support.adoc

@@ -127,6 +127,28 @@ Flex Gateway supports a subset of DataWeave in policy configuration expressions.
 * xref:dataweave::dw-strings-functions-substringbeforelast.adoc#substringbeforelast1[`substringBeforeLast(text: String, separator: String): String`]
 * xref:dataweave::dw-strings-functions-substringbeforelast.adoc#substringbeforelast2[`substringBeforeLast(text: Null, separator: String): Null`]
 
+=== toBase64
+
+* xref:dataweave::dw-binaries-functions-tobase64.adoc#tobase641[`toBase64(content: Binary): String`]
+
+=== fromBase64
+
+* xref:dataweave::dw-binaries-functions-frombase64.adoc#frombase641[`fromBase64(base64String: String): Binary`]
+
+[NOTE]
+====
+Flex Gateway doesn't support DataWeave expressions with binary type results. To use the `dw::Binaries::fromBase64('dXNlcjpwYXNz')` function, transform the result to a string. Transform the binary output to a string with the `dw::util::Coercions::toString(binary: Binary, encoding: String): String` function. For example, `#[dw::util::Coercions::toString(dw::core::Binaries::fromBase64('dXNlcjpwYXNz'), 'UTF-8')]`. 
+If using a different function that transforms the binary by default, such as `#[splitBy(dw::core::Binaries::fromBase64('dXNlcjpwYXNz'), ':')]`, you can skip manually transforming the binary. 
+====
+
+=== toBinary
+
+* xref:dataweave::dw-coercions-functions-tobinary.adoc#tobinary1[`toBinary(str: String, encoding: String): Binary`]
+
+=== toString
+
+* xref:dataweave::dw-coercions-functions-tostring.adoc#tostring3[`toString(binary: Binary, encoding: String): String`]
+
 [[available-predefined-variables]]
 == Available Predefined Variables
 
@@ -150,7 +172,7 @@ Flex Gateway supports a subset of DataWeave in policy configuration expressions.
 ** `authentication.properties`
 
 * `payload`
-** Use the `payload` variable to read the request body as a string. You can't parse this variable. 
+** Fields depend on the current payload. For example, `#[payload]` returns the body of the message.
 
 * xref:dataweave::dataweave-variables-context.adoc[`vars`]
 ** Individual policies support different sets of variables. For information, refer to the policies listed in xref:policies-included-directory.adoc[].