mirror of https://github.com/knative/func.git
68 lines
1.5 KiB
Go
68 lines
1.5 KiB
Go
package k8s
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import (
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"errors"
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"strings"
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"k8s.io/apimachinery/pkg/util/validation"
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)
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// ToSubdomain converts a domain to a subdomain.
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// If the input is not a valid domain an error is thrown.
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func ToSubdomain(in string) (string, error) {
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if err := validation.IsFullyQualifiedDomainName(nil, in); err != nil {
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return "", err.ToAggregate()
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}
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out := []rune{}
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for _, c := range in {
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// convert dots to hyphens
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if c == '.' {
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out = append(out, '-')
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} else if c == '-' {
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out = append(out, '-')
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out = append(out, '-')
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} else {
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out = append(out, c)
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}
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}
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return string(out), nil
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}
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// FromSubdomain converts a doman which has been encoded as
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// a subdomain using the algorithm of ToSubdoman back to a domain.
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// Input errors if not a 1035 label.
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func FromSubdomain(in string) (string, error) {
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if errs := validation.IsDNS1035Label(in); len(errs) > 0 {
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return "", errors.New(strings.Join(errs, ","))
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}
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rr := []rune(in)
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out := []rune{}
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for i := 0; i < len(rr); i++ {
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c := rr[i]
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if c == '-' {
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// If the next rune is either nonexistent
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// or not also a dash, this is an encoded dot.
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if i+1 == len(rr) || rr[i+1] != '-' {
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out = append(out, '.')
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continue
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}
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// If the next rune is also a dash, this is
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// an escaping dash, so append a slash, and
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// increment the pointer such that the next
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// loop begins with the next potential tuple.
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if rr[i+1] == '-' {
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out = append(out, '-')
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i++
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continue
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}
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}
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out = append(out, c)
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}
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return string(out), nil
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}
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