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package http
import (
"context"
"fmt"
"github.com/aws/smithy-go/middleware"
"strings"
)
// MinimumProtocolError is an error type indicating that the established connection did not meet the expected minimum
// HTTP protocol version.
type MinimumProtocolError struct {
proto string
expectedProtoMajor int
expectedProtoMinor int
}
// Error returns the error message.
func (m *MinimumProtocolError) Error() string {
return fmt.Sprintf("operation requires minimum HTTP protocol of HTTP/%d.%d, but was %s",
m.expectedProtoMajor, m.expectedProtoMinor, m.proto)
}
// RequireMinimumProtocol is a deserialization middleware that asserts that the established HTTP connection
// meets the minimum major ad minor version.
type RequireMinimumProtocol struct {
ProtoMajor int
ProtoMinor int
}
// AddRequireMinimumProtocol adds the RequireMinimumProtocol middleware to the stack using the provided minimum
// protocol major and minor version.
func AddRequireMinimumProtocol(stack *middleware.Stack, major, minor int) error {
return stack.Deserialize.Insert(&RequireMinimumProtocol{
ProtoMajor: major,
ProtoMinor: minor,
}, "OperationDeserializer", middleware.Before)
}
// ID returns the middleware identifier string.
func (r *RequireMinimumProtocol) ID() string {
return "RequireMinimumProtocol"
}
// HandleDeserialize asserts that the established connection is a HTTP connection with the minimum major and minor
// protocol version.
func (r *RequireMinimumProtocol) HandleDeserialize(
ctx context.Context, in middleware.DeserializeInput, next middleware.DeserializeHandler,
) (
out middleware.DeserializeOutput, metadata middleware.Metadata, err error,
) {
out, metadata, err = next.HandleDeserialize(ctx, in)
if err != nil {
return out, metadata, err
}
response, ok := out.RawResponse.(*Response)
if !ok {
return out, metadata, fmt.Errorf("unknown transport type: %T", out.RawResponse)
}
if !strings.HasPrefix(response.Proto, "HTTP") {
return out, metadata, &MinimumProtocolError{
proto: response.Proto,
expectedProtoMajor: r.ProtoMajor,
expectedProtoMinor: r.ProtoMinor,
}
}
if response.ProtoMajor < r.ProtoMajor || response.ProtoMinor < r.ProtoMinor {
return out, metadata, &MinimumProtocolError{
proto: response.Proto,
expectedProtoMajor: r.ProtoMajor,
expectedProtoMinor: r.ProtoMinor,
}
}
return out, metadata, err
}
|
