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