software.amazon.awssdk.auth.signer.internal.util

Class HeaderTransformsHelper

java.lang.Object

software.amazon.awssdk.auth.signer.internal.util.HeaderTransformsHelper

public final class HeaderTransformsHelper
extends Object

Helper class for transforming headers required during signing of headers.

Method Summary

Modifier and Type	Method and Description
static Map<String,List<String>>	canonicalizeSigningHeaders(Map<String,List<String>> headers)
static String	getCanonicalizedHeaderString(Map<String,List<String>> canonicalizedHeaders)
static String	trimAll(String value) "The Trimall function removes excess white space before and after values, and converts sequential spaces to a single space."

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

canonicalizeSigningHeaders

public static Map<String,List<String>> canonicalizeSigningHeaders(Map<String,List<String>> headers)

trimAll

public static String trimAll(String value)

"The Trimall function removes excess white space before and after values, and converts sequential spaces to a single space."

https://docs.aws.amazon.com/general/latest/gr/sigv4-create-canonical-request.html

The collapse-whitespace logic is equivalent to:

     value.replaceAll("\\s+", " ")
 

but does not create a Pattern object that needs to compile the match string; it also prevents us from having to make a Matcher object as well.

getCanonicalizedHeaderString

public static String getCanonicalizedHeaderString(Map<String,List<String>> canonicalizedHeaders)