s3 cache client-side support

Signed-off-by: CrazyMax <crazy-max@users.noreply.github.com>

vendor/github.com/aws/smithy-go/encoding/xml/array.go

@@ -0,0 +1,49 @@
+package xml
+
+// arrayMemberWrapper is the default member wrapper tag name for XML Array type
+var arrayMemberWrapper = StartElement{
+	Name: Name{Local: "member"},
+}
+
+// Array represents the encoding of a XML array type
+type Array struct {
+	w       writer
+	scratch *[]byte
+
+	// member start element is the array member wrapper start element
+	memberStartElement StartElement
+
+	// isFlattened indicates if the array is a flattened array.
+	isFlattened bool
+}
+
+// newArray returns an array encoder.
+// It also takes in the  member start element, array start element.
+// It takes in a isFlattened bool, indicating that an array is flattened array.
+//
+// A wrapped array ["value1", "value2"] is represented as
+// `<List><member>value1</member><member>value2</member></List>`.
+
+// A flattened array `someList: ["value1", "value2"]` is represented as
+// `<someList>value1</someList><someList>value2</someList>`.
+func newArray(w writer, scratch *[]byte, memberStartElement StartElement, arrayStartElement StartElement, isFlattened bool) *Array {
+	var memberWrapper = memberStartElement
+	if isFlattened {
+		memberWrapper = arrayStartElement
+	}
+
+	return &Array{
+		w:                  w,
+		scratch:            scratch,
+		memberStartElement: memberWrapper,
+		isFlattened:        isFlattened,
+	}
+}
+
+// Member adds a new member to the XML array.
+// It returns a Value encoder.
+func (a *Array) Member() Value {
+	v := newValue(a.w, a.scratch, a.memberStartElement)
+	v.isFlattened = a.isFlattened
+	return v
+}