65 lines
1.6 KiB
Go
65 lines
1.6 KiB
Go
// libnmdc project libnmdc.go
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package libnmdc
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import (
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"errors"
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"fmt"
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"regexp"
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"strings"
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"time"
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)
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const (
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DEFAULT_CLIENT_TAG string = "libnmdc.go"
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DEFAULT_HUB_NAME string = "(unknown)"
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SEND_KEEPALIVE_EVERY time.Duration = 29 * time.Second
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AUTO_RECONNECT_AFTER time.Duration = 30 * time.Second
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)
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var rx_protocolMessage *regexp.Regexp
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var rx_publicChat *regexp.Regexp
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var rx_incomingTo *regexp.Regexp
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var rx_userCommand *regexp.Regexp
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var ErrNotConnected error = errors.New("Not connected")
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func init() {
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rx_protocolMessage = regexp.MustCompile("(?ms)^[^|]*\\|")
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rx_publicChat = regexp.MustCompile("(?ms)^<([^>]*)> (.*)$")
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rx_incomingTo = regexp.MustCompile("(?ms)^([^ ]+) From: ([^ ]+) \\$<([^>]*)> (.*)")
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rx_userCommand = regexp.MustCompile(`(?ms)^(\d+) (\d+)\s?([^\$]*)\$?(.*)`)
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}
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func NMDCUnescape(encoded string) string {
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v1 := strings.Replace(encoded, "$", "$", -1)
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v2 := strings.Replace(v1, "|", "|", -1)
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return strings.Replace(v2, "&", "&", -1)
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}
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func NMDCEscape(plaintext string) string {
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v1 := strings.Replace(plaintext, "&", "&", -1)
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v2 := strings.Replace(v1, "|", "|", -1)
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return strings.Replace(v2, "$", "$", -1)
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}
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func NMDCUnlock(lock []byte) string {
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nibble_swap := func(b byte) byte {
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return ((b << 4) & 0xF0) | ((b >> 4) & 0x0F)
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}
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chr := func(b byte) string {
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if b == 0 || b == 5 || b == 36 || b == 96 || b == 124 || b == 126 {
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return fmt.Sprintf("/%%DCN%04d%%/", b)
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} else {
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return string(b)
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}
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}
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key := chr(nibble_swap(lock[0] ^ lock[len(lock)-2] ^ lock[len(lock)-3] ^ 5))
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for i := 1; i < len(lock); i += 1 {
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key += chr(nibble_swap(lock[i] ^ lock[i-1]))
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}
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return key
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}
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