45 lines
783 B
Go
45 lines
783 B
Go
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package googlecompute
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import (
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"regexp"
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"strings"
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"text/template"
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)
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func isalphanumeric(b byte) bool {
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if '0' <= b && b <= '9' {
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return true
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}
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if 'a' <= b && b <= 'z' {
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return true
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}
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return false
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}
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// Clean up image name by replacing invalid characters with "-"
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// truncate up to 63 length, convert to a lower case
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func templateCleanAMIName(s string) string {
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re := regexp.MustCompile(`^[a-z][-a-z0-9]{0,61}[a-z0-9]$`)
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if re.MatchString(s) {
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return s
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}
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b := []byte(strings.ToLower(s))
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l := 63
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if len(b) < 63 {
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l = len(b)
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}
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newb := make([]byte, l)
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for i := range newb {
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if isalphanumeric(b[i]) {
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newb[i] = b[i]
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} else {
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newb[i] = '-'
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}
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}
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return string(newb)
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}
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var TemplateFuncs = template.FuncMap{
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"clean_ami_name": templateCleanAMIName,
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}
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