Bump AWS SDK

Fixes https://github.com/docker/distribution/issues/3097

Signed-off-by: Yong Wen Chua <lawliet89@users.noreply.github.com>

vendor/github.com/aws/aws-sdk-go/private/protocol/host.go

@@ -0,0 +1,68 @@
+package protocol
+
+import (
+	"strings"
+
+	"github.com/aws/aws-sdk-go/aws/request"
+)
+
+// ValidateEndpointHostHandler is a request handler that will validate the
+// request endpoint's hosts is a valid RFC 3986 host.
+var ValidateEndpointHostHandler = request.NamedHandler{
+	Name: "awssdk.protocol.ValidateEndpointHostHandler",
+	Fn: func(r *request.Request) {
+		err := ValidateEndpointHost(r.Operation.Name, r.HTTPRequest.URL.Host)
+		if err != nil {
+			r.Error = err
+		}
+	},
+}
+
+// ValidateEndpointHost validates that the host string passed in is a valid RFC
+// 3986 host. Returns error if the host is not valid.
+func ValidateEndpointHost(opName, host string) error {
+	paramErrs := request.ErrInvalidParams{Context: opName}
+	labels := strings.Split(host, ".")
+
+	for i, label := range labels {
+		if i == len(labels)-1 && len(label) == 0 {
+			// Allow trailing dot for FQDN hosts.
+			continue
+		}
+
+		if !ValidHostLabel(label) {
+			paramErrs.Add(request.NewErrParamFormat(
+				"endpoint host label", "[a-zA-Z0-9-]{1,63}", label))
+		}
+	}
+
+	if len(host) > 255 {
+		paramErrs.Add(request.NewErrParamMaxLen(
+			"endpoint host", 255, host,
+		))
+	}
+
+	if paramErrs.Len() > 0 {
+		return paramErrs
+	}
+	return nil
+}
+
+// ValidHostLabel returns if the label is a valid RFC 3986 host label.
+func ValidHostLabel(label string) bool {
+	if l := len(label); l == 0 || l > 63 {
+		return false
+	}
+	for _, r := range label {
+		switch {
+		case r >= '0' && r <= '9':
+		case r >= 'A' && r <= 'Z':
+		case r >= 'a' && r <= 'z':
+		case r == '-':
+		default:
+			return false
+		}
+	}
+
+	return true
+}