src

Go monorepo.
git clone git://code.dwrz.net/src
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middleware_min_proto.go (2420B)

      1 package http
      2 
      3 import (
      4 	"context"
      5 	"fmt"
      6 	"github.com/aws/smithy-go/middleware"
      7 	"strings"
      8 )
      9 
     10 // MinimumProtocolError is an error type indicating that the established connection did not meet the expected minimum
     11 // HTTP protocol version.
     12 type MinimumProtocolError struct {
     13 	proto              string
     14 	expectedProtoMajor int
     15 	expectedProtoMinor int
     16 }
     17 
     18 // Error returns the error message.
     19 func (m *MinimumProtocolError) Error() string {
     20 	return fmt.Sprintf("operation requires minimum HTTP protocol of HTTP/%d.%d, but was %s",
     21 		m.expectedProtoMajor, m.expectedProtoMinor, m.proto)
     22 }
     23 
     24 // RequireMinimumProtocol is a deserialization middleware that asserts that the established HTTP connection
     25 // meets the minimum major ad minor version.
     26 type RequireMinimumProtocol struct {
     27 	ProtoMajor int
     28 	ProtoMinor int
     29 }
     30 
     31 // AddRequireMinimumProtocol adds the RequireMinimumProtocol middleware to the stack using the provided minimum
     32 // protocol major and minor version.
     33 func AddRequireMinimumProtocol(stack *middleware.Stack, major, minor int) error {
     34 	return stack.Deserialize.Insert(&RequireMinimumProtocol{
     35 		ProtoMajor: major,
     36 		ProtoMinor: minor,
     37 	}, "OperationDeserializer", middleware.Before)
     38 }
     39 
     40 // ID returns the middleware identifier string.
     41 func (r *RequireMinimumProtocol) ID() string {
     42 	return "RequireMinimumProtocol"
     43 }
     44 
     45 // HandleDeserialize asserts that the established connection is a HTTP connection with the minimum major and minor
     46 // protocol version.
     47 func (r *RequireMinimumProtocol) HandleDeserialize(
     48 	ctx context.Context, in middleware.DeserializeInput, next middleware.DeserializeHandler,
     49 ) (
     50 	out middleware.DeserializeOutput, metadata middleware.Metadata, err error,
     51 ) {
     52 	out, metadata, err = next.HandleDeserialize(ctx, in)
     53 	if err != nil {
     54 		return out, metadata, err
     55 	}
     56 
     57 	response, ok := out.RawResponse.(*Response)
     58 	if !ok {
     59 		return out, metadata, fmt.Errorf("unknown transport type: %T", out.RawResponse)
     60 	}
     61 
     62 	if !strings.HasPrefix(response.Proto, "HTTP") {
     63 		return out, metadata, &MinimumProtocolError{
     64 			proto:              response.Proto,
     65 			expectedProtoMajor: r.ProtoMajor,
     66 			expectedProtoMinor: r.ProtoMinor,
     67 		}
     68 	}
     69 
     70 	if response.ProtoMajor < r.ProtoMajor || response.ProtoMinor < r.ProtoMinor {
     71 		return out, metadata, &MinimumProtocolError{
     72 			proto:              response.Proto,
     73 			expectedProtoMajor: r.ProtoMajor,
     74 			expectedProtoMinor: r.ProtoMinor,
     75 		}
     76 	}
     77 
     78 	return out, metadata, err
     79 }