69 lines
1.5 KiB
Go
69 lines
1.5 KiB
Go
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package protocol
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import (
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"strings"
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"github.com/aws/aws-sdk-go/aws/request"
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)
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// ValidateEndpointHostHandler is a request handler that will validate the
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// request endpoint's hosts is a valid RFC 3986 host.
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var ValidateEndpointHostHandler = request.NamedHandler{
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Name: "awssdk.protocol.ValidateEndpointHostHandler",
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Fn: func(r *request.Request) {
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err := ValidateEndpointHost(r.Operation.Name, r.HTTPRequest.URL.Host)
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if err != nil {
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r.Error = err
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}
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},
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}
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// ValidateEndpointHost validates that the host string passed in is a valid RFC
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// 3986 host. Returns error if the host is not valid.
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func ValidateEndpointHost(opName, host string) error {
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paramErrs := request.ErrInvalidParams{Context: opName}
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labels := strings.Split(host, ".")
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for i, label := range labels {
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if i == len(labels)-1 && len(label) == 0 {
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// Allow trailing dot for FQDN hosts.
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continue
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}
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if !ValidHostLabel(label) {
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paramErrs.Add(request.NewErrParamFormat(
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"endpoint host label", "[a-zA-Z0-9-]{1,63}", label))
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}
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}
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if len(host) > 255 {
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paramErrs.Add(request.NewErrParamMaxLen(
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"endpoint host", 255, host,
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))
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}
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if paramErrs.Len() > 0 {
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return paramErrs
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}
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return nil
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}
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// ValidHostLabel returns if the label is a valid RFC 3986 host label.
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func ValidHostLabel(label string) bool {
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if l := len(label); l == 0 || l > 63 {
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return false
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}
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for _, r := range label {
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switch {
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case r >= '0' && r <= '9':
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case r >= 'A' && r <= 'Z':
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case r >= 'a' && r <= 'z':
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case r == '-':
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default:
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return false
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}
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}
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return true
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}
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