Function ParseSubprotocolString

db/blip_subprotocol.go:44–57

ParseSubprotocolString takes a 'CBMobile_' prefixed string and returns the subprotocol version.

(s string)

// ParseSubprotocolString takes a 'CBMobile_' prefixed string and returns the subprotocol version.
func ParseSubprotocolString(s string) (CBMobileSubprotocolVersion, error) {
	vStr, ok := strings.CutPrefix(s, cbMobileBLIPSubprotocolPrefix)
	if !ok {
		return 0, fmt.Errorf("invalid subprotocol string: %q", s)
	}
	v, err := strconv.Atoi(vStr)
	if err != nil {
		return 0, fmt.Errorf("invalid subprotocol string: %q: %w", s, err)
	}
	if v < int(minCBMobileSubprotocolVersion) || v > int(maxCBMobileSubprotocolVersion) {
		return 0, fmt.Errorf("invalid subprotocol version: %q", s)
	}
	return CBMobileSubprotocolVersion(v), nil
}

// supportedSubprotocols returns a list of supported subprotocol versions, in order of most preferred first
func supportedSubprotocols() []string {