72 lines
1.5 KiB
Go
72 lines
1.5 KiB
Go
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package cors
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import "strings"
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const toLower = 'a' - 'A'
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type converter func(string) string
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type wildcard struct {
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prefix string
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suffix string
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}
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func (w wildcard) match(s string) bool {
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return len(s) >= len(w.prefix)+len(w.suffix) && strings.HasPrefix(s, w.prefix) && strings.HasSuffix(s, w.suffix)
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}
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// convert converts a list of string using the passed converter function
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func convert(s []string, c converter) []string {
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out := []string{}
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for _, i := range s {
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out = append(out, c(i))
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}
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return out
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}
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// parseHeaderList tokenize + normalize a string containing a list of headers
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func parseHeaderList(headerList string) []string {
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l := len(headerList)
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h := make([]byte, 0, l)
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upper := true
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// Estimate the number headers in order to allocate the right splice size
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t := 0
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for i := 0; i < l; i++ {
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if headerList[i] == ',' {
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t++
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}
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}
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headers := make([]string, 0, t)
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for i := 0; i < l; i++ {
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b := headerList[i]
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switch {
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case b >= 'a' && b <= 'z':
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if upper {
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h = append(h, b-toLower)
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} else {
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h = append(h, b)
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}
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case b >= 'A' && b <= 'Z':
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if !upper {
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h = append(h, b+toLower)
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} else {
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h = append(h, b)
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}
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case b == '-' || b == '_' || (b >= '0' && b <= '9'):
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h = append(h, b)
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}
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if b == ' ' || b == ',' || i == l-1 {
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if len(h) > 0 {
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// Flush the found header
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headers = append(headers, string(h))
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h = h[:0]
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upper = true
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}
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} else {
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upper = b == '-' || b == '_'
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}
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}
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return headers
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}
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