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59 lines
2.3 KiB
59 lines
2.3 KiB
/*
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Copyright © 2020-2023 The k3d Author(s)
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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*/
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package client
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import (
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"fmt"
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"regexp"
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"github.com/k3d-io/k3d/v5/pkg/types"
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)
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// HostnameRegexp as per RFC 1123
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var HostnameRegexp = regexp.MustCompile(`^(([a-zA-Z0-9]|[a-zA-Z0-9][a-zA-Z0-9\-]*[a-zA-Z0-9])\.)*([A-Za-z0-9]|[A-Za-z0-9][A-Za-z0-9\-]*[A-Za-z0-9])$`)
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// CheckName ensures that a cluster name is also a valid host name according to RFC 1123.
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// We further restrict the length of the cluster name to maximum 'clusterNameMaxSize'
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// so that we can construct the host names based on the cluster name, and still stay
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// within the 64 characters limit.
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func CheckName(name string) error {
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if err := ValidateHostname(name); err != nil {
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return fmt.Errorf("Invalid cluster name. %+v", ValidateHostname(name))
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}
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if len(name) > types.DefaultClusterNameMaxLength {
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return fmt.Errorf("Cluster name must be <= %d characters, but has %d", types.DefaultClusterNameMaxLength, len(name))
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}
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return nil
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}
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// ValidateHostname ensures that a cluster name is also a valid host name according to RFC 1123.
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func ValidateHostname(name string) error {
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if len(name) == 0 {
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return fmt.Errorf("No name provided")
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}
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if !HostnameRegexp.Match([]byte(name)) {
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return fmt.Errorf("name %s is not a valid hostname as per RFC 1123", name)
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}
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return nil
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}
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