57 lines
1.1 KiB
Go
57 lines
1.1 KiB
Go
package cookie
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import (
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"crypto/sha1"
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"fmt"
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"strings"
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"github.com/containous/traefik/log"
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)
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const cookieNameLength = 6
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// GetName of a cookie
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func GetName(cookieName string, backendName string) string {
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if len(cookieName) != 0 {
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return sanitizeName(cookieName)
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}
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return GenerateName(backendName)
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}
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// GenerateName Generate a hashed name
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func GenerateName(backendName string) string {
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data := []byte("_TRAEFIK_BACKEND_" + backendName)
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hash := sha1.New()
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_, err := hash.Write(data)
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if err != nil {
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// Impossible case
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log.Errorf("Fail to create cookie name: %v", err)
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}
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return fmt.Sprintf("_%x", hash.Sum(nil))[:cookieNameLength]
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}
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// sanitizeName According to [RFC 2616](https://www.ietf.org/rfc/rfc2616.txt) section 2.2
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func sanitizeName(backend string) string {
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sanitizer := func(r rune) rune {
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switch r {
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case '!', '#', '$', '%', '&', '\'', '*', '+', '-', '.', '^', '`', '|', '~':
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return r
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}
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switch {
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case 'a' <= r && r <= 'z':
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fallthrough
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case 'A' <= r && r <= 'Z':
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fallthrough
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case '0' <= r && r <= '9':
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return r
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default:
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return '_'
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}
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}
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return strings.Map(sanitizer, backend)
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}
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