2fa8f2435f
Capture, decrypt, and restream toolkit with compiled-in app modules (RTE, TG4, BBC), on-device MITM proxy, streamd control plane, and www. BBC module.yaml is published (clear streams); other module values stay local.
50 lines
1.2 KiB
Go
50 lines
1.2 KiB
Go
package mpd
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import (
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"encoding/xml"
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"fmt"
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"regexp"
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"strings"
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)
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var reDefaultKID = regexp.MustCompile(`(?i)default_KID="([^"]+)"`)
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// KIDToUUID normalizes any hex-ish KID spelling to dashed UUID form.
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func KIDToUUID(kid string) (string, error) {
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var b strings.Builder
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for _, r := range kid {
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if (r >= '0' && r <= '9') || (r >= 'a' && r <= 'f') || (r >= 'A' && r <= 'F') {
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b.WriteRune(r)
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}
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}
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h := strings.ToLower(b.String())
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if len(h) != 32 {
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return "", fmt.Errorf("invalid KID %q", kid)
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}
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return fmt.Sprintf("%s-%s-%s-%s-%s", h[0:8], h[8:12], h[12:16], h[16:20], h[20:32]), nil
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}
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// KIDHex strips dashes and lowercases a KID (the form used as a map key).
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func KIDHex(kid string) string {
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return strings.ToLower(strings.ReplaceAll(kid, "-", ""))
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}
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// ExtractDefaultKID pulls cenc:default_KID out of an MPD, as dashed UUID.
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func ExtractDefaultKID(xmlText string) string {
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m := reDefaultKID.FindStringSubmatch(xmlText)
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if len(m) < 2 {
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return ""
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}
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u, err := KIDToUUID(m[1])
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if err != nil {
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return ""
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}
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return u
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}
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// XMLEscape escapes text for inclusion in an XML element body.
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func XMLEscape(s string) string {
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var b strings.Builder
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_ = xml.EscapeText(&b, []byte(s))
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return b.String()
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}
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