1package protocol
2
3import (
4	"fmt"
5	"strings"
6
7	"github.com/aws/aws-sdk-go/aws/awserr"
8	"github.com/aws/aws-sdk-go/aws/request"
9)
10
11// RequireHTTPMinProtocol request handler is used to enforce that
12// the target endpoint supports the given major and minor HTTP protocol version.
13type RequireHTTPMinProtocol struct {
14	Major, Minor int
15}
16
17// Handler will mark the request.Request with an error if the
18// target endpoint did not connect with the required HTTP protocol
19// major and minor version.
20func (p RequireHTTPMinProtocol) Handler(r *request.Request) {
21	if r.Error != nil || r.HTTPResponse == nil {
22		return
23	}
24
25	if !strings.HasPrefix(r.HTTPResponse.Proto, "HTTP") {
26		r.Error = newMinHTTPProtoError(p.Major, p.Minor, r)
27	}
28
29	if r.HTTPResponse.ProtoMajor < p.Major || r.HTTPResponse.ProtoMinor < p.Minor {
30		r.Error = newMinHTTPProtoError(p.Major, p.Minor, r)
31	}
32}
33
34// ErrCodeMinimumHTTPProtocolError error code is returned when the target endpoint
35// did not match the required HTTP major and minor protocol version.
36const ErrCodeMinimumHTTPProtocolError = "MinimumHTTPProtocolError"
37
38func newMinHTTPProtoError(major, minor int, r *request.Request) error {
39	return awserr.NewRequestFailure(
40		awserr.New("MinimumHTTPProtocolError",
41			fmt.Sprintf(
42				"operation requires minimum HTTP protocol of HTTP/%d.%d, but was %s",
43				major, minor, r.HTTPResponse.Proto,
44			),
45			nil,
46		),
47		r.HTTPResponse.StatusCode, r.RequestID,
48	)
49}
50