s3 cache client-side support

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

vendor/github.com/aws/smithy-go/encoding/httpbinding/header.go

@@ -0,0 +1,122 @@
+package httpbinding
+
+import (
+	"encoding/base64"
+	"math"
+	"math/big"
+	"net/http"
+	"strconv"
+	"strings"
+)
+
+// Headers is used to encode header keys using a provided prefix
+type Headers struct {
+	header http.Header
+	prefix string
+}
+
+// AddHeader returns a HeaderValue used to append values to prefix+key
+func (h Headers) AddHeader(key string) HeaderValue {
+	return h.newHeaderValue(key, true)
+}
+
+// SetHeader returns a HeaderValue used to set the value of prefix+key
+func (h Headers) SetHeader(key string) HeaderValue {
+	return h.newHeaderValue(key, false)
+}
+
+func (h Headers) newHeaderValue(key string, append bool) HeaderValue {
+	return newHeaderValue(h.header, h.prefix+strings.TrimSpace(key), append)
+}
+
+// HeaderValue is used to encode values to an HTTP header
+type HeaderValue struct {
+	header http.Header
+	key    string
+	append bool
+}
+
+func newHeaderValue(header http.Header, key string, append bool) HeaderValue {
+	return HeaderValue{header: header, key: strings.TrimSpace(key), append: append}
+}
+
+func (h HeaderValue) modifyHeader(value string) {
+	if h.append {
+		h.header[h.key] = append(h.header[h.key], value)
+	} else {
+		h.header[h.key] = append(h.header[h.key][:0], value)
+	}
+}
+
+// String encodes the value v as the header string value
+func (h HeaderValue) String(v string) {
+	h.modifyHeader(v)
+}
+
+// Byte encodes the value v as a query string value
+func (h HeaderValue) Byte(v int8) {
+	h.Long(int64(v))
+}
+
+// Short encodes the value v as a query string value
+func (h HeaderValue) Short(v int16) {
+	h.Long(int64(v))
+}
+
+// Integer encodes the value v as the header string value
+func (h HeaderValue) Integer(v int32) {
+	h.Long(int64(v))
+}
+
+// Long encodes the value v as the header string value
+func (h HeaderValue) Long(v int64) {
+	h.modifyHeader(strconv.FormatInt(v, 10))
+}
+
+// Boolean encodes the value v as a query string value
+func (h HeaderValue) Boolean(v bool) {
+	h.modifyHeader(strconv.FormatBool(v))
+}
+
+// Float encodes the value v as a query string value
+func (h HeaderValue) Float(v float32) {
+	h.float(float64(v), 32)
+}
+
+// Double encodes the value v as a query string value
+func (h HeaderValue) Double(v float64) {
+	h.float(v, 64)
+}
+
+func (h HeaderValue) float(v float64, bitSize int) {
+	switch {
+	case math.IsNaN(v):
+		h.String(floatNaN)
+	case math.IsInf(v, 1):
+		h.String(floatInfinity)
+	case math.IsInf(v, -1):
+		h.String(floatNegInfinity)
+	default:
+		h.modifyHeader(strconv.FormatFloat(v, 'f', -1, bitSize))
+	}
+}
+
+// BigInteger encodes the value v as a query string value
+func (h HeaderValue) BigInteger(v *big.Int) {
+	h.modifyHeader(v.String())
+}
+
+// BigDecimal encodes the value v as a query string value
+func (h HeaderValue) BigDecimal(v *big.Float) {
+	if i, accuracy := v.Int64(); accuracy == big.Exact {
+		h.Long(i)
+		return
+	}
+	h.modifyHeader(v.Text('e', -1))
+}
+
+// Blob encodes the value v as a base64 header string value
+func (h HeaderValue) Blob(v []byte) {
+	encodeToString := base64.StdEncoding.EncodeToString(v)
+	h.modifyHeader(encodeToString)
+}