42 lines
1007 B
Go
42 lines
1007 B
Go
// Copyright (c) HashiCorp, Inc.
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// SPDX-License-Identifier: BUSL-1.1
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package protocolversion
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import (
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"fmt"
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"io"
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)
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// Header keys.
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const (
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HeaderClientApiProtocol = "client-api-protocol"
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HeaderClientEntrypointProtocol = "client-entrypoint-protocol"
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HeaderClientVersion = "client-version"
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)
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// ParseHeader parses header values containing minimum and current
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// protocol version numbers. This returns an error if parsing fails for
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// reason, including blank values.
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func ParseHeader(v string) (uint32, uint32, error) {
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var min, current uint32
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n, err := fmt.Sscanf(v, "%d,%d", &min, ¤t)
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if err == io.EOF {
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n = 0
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err = nil
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}
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if err != nil {
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return 0, 0, err
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}
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if n != 2 {
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return 0, 0, fmt.Errorf("protocol version header must be formatted <min>,<current>")
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}
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return min, current, nil
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}
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// EncodeHeader creates a valid header value for the protocol version headers.
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func EncodeHeader(min, current uint32) string {
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return fmt.Sprintf("%d,%d", min, current)
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}
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