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git clone git://code.dwrz.net/src
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middleware_min_proto.go (2421B)

      1 package http
      2 
      3 import (
      4 	"context"
      5 	"fmt"
      6 	"strings"
      7 
      8 	"github.com/aws/smithy-go/middleware"
      9 )
     10 
     11 // MinimumProtocolError is an error type indicating that the established connection did not meet the expected minimum
     12 // HTTP protocol version.
     13 type MinimumProtocolError struct {
     14 	proto              string
     15 	expectedProtoMajor int
     16 	expectedProtoMinor int
     17 }
     18 
     19 // Error returns the error message.
     20 func (m *MinimumProtocolError) Error() string {
     21 	return fmt.Sprintf("operation requires minimum HTTP protocol of HTTP/%d.%d, but was %s",
     22 		m.expectedProtoMajor, m.expectedProtoMinor, m.proto)
     23 }
     24 
     25 // RequireMinimumProtocol is a deserialization middleware that asserts that the established HTTP connection
     26 // meets the minimum major ad minor version.
     27 type RequireMinimumProtocol struct {
     28 	ProtoMajor int
     29 	ProtoMinor int
     30 }
     31 
     32 // AddRequireMinimumProtocol adds the RequireMinimumProtocol middleware to the stack using the provided minimum
     33 // protocol major and minor version.
     34 func AddRequireMinimumProtocol(stack *middleware.Stack, major, minor int) error {
     35 	return stack.Deserialize.Insert(&RequireMinimumProtocol{
     36 		ProtoMajor: major,
     37 		ProtoMinor: minor,
     38 	}, "OperationDeserializer", middleware.Before)
     39 }
     40 
     41 // ID returns the middleware identifier string.
     42 func (r *RequireMinimumProtocol) ID() string {
     43 	return "RequireMinimumProtocol"
     44 }
     45 
     46 // HandleDeserialize asserts that the established connection is a HTTP connection with the minimum major and minor
     47 // protocol version.
     48 func (r *RequireMinimumProtocol) HandleDeserialize(
     49 	ctx context.Context, in middleware.DeserializeInput, next middleware.DeserializeHandler,
     50 ) (
     51 	out middleware.DeserializeOutput, metadata middleware.Metadata, err error,
     52 ) {
     53 	out, metadata, err = next.HandleDeserialize(ctx, in)
     54 	if err != nil {
     55 		return out, metadata, err
     56 	}
     57 
     58 	response, ok := out.RawResponse.(*Response)
     59 	if !ok {
     60 		return out, metadata, fmt.Errorf("unknown transport type: %T", out.RawResponse)
     61 	}
     62 
     63 	if !strings.HasPrefix(response.Proto, "HTTP") {
     64 		return out, metadata, &MinimumProtocolError{
     65 			proto:              response.Proto,
     66 			expectedProtoMajor: r.ProtoMajor,
     67 			expectedProtoMinor: r.ProtoMinor,
     68 		}
     69 	}
     70 
     71 	if response.ProtoMajor < r.ProtoMajor || response.ProtoMinor < r.ProtoMinor {
     72 		return out, metadata, &MinimumProtocolError{
     73 			proto:              response.Proto,
     74 			expectedProtoMajor: r.ProtoMajor,
     75 			expectedProtoMinor: r.ProtoMinor,
     76 		}
     77 	}
     78 
     79 	return out, metadata, err
     80 }