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package webircgateway
import (
"context"
"fmt"
"net"
"strings"
"unicode/utf8"
"golang.org/x/net/html/charset"
"golang.org/x/time/rate"
)
var privateIPBlocks []*net.IPNet
func init() {
for _, cidr := range []string{
"127.0.0.0/8", // IPv4 loopback
"10.0.0.0/8", // RFC1918
"172.16.0.0/12", // RFC1918
"192.168.0.0/16", // RFC1918
"::1/128", // IPv6 loopback
"fe80::/10", // IPv6 link-local
} {
_, block, _ := net.ParseCIDR(cidr)
privateIPBlocks = append(privateIPBlocks, block)
}
}
func isPrivateIP(ip net.IP) bool {
for _, block := range privateIPBlocks {
if block.Contains(ip) {
return true
}
}
return false
}
// Username / realname / webirc hostname can all have configurable replacements
func makeClientReplacements(format string, client *Client) string {
ret := format
ret = strings.Replace(ret, "%a", client.RemoteAddr, -1)
ret = strings.Replace(ret, "%i", Ipv4ToHex(client.RemoteAddr), -1)
ret = strings.Replace(ret, "%h", client.RemoteHostname, -1)
ret = strings.Replace(ret, "%n", client.IrcState.Nick, -1)
return ret
}
func Ipv4ToHex(ip string) string {
var ipParts [4]int
fmt.Sscanf(ip, "%d.%d.%d.%d", &ipParts[0], &ipParts[1], &ipParts[2], &ipParts[3])
ipHex := fmt.Sprintf("%02x%02x%02x%02x", ipParts[0], ipParts[1], ipParts[2], ipParts[3])
return ipHex
}
func ensureUtf8(s string, fromEncoding string) string {
if utf8.ValidString(s) {
return s
}
encoding, encErr := charset.Lookup(fromEncoding)
if encoding == nil {
println("encErr:", encErr)
return ""
}
d := encoding.NewDecoder()
s2, _ := d.String(s)
return s2
}
func utf8ToOther(s string, toEncoding string) string {
if toEncoding == "UTF-8" && utf8.ValidString(s) {
return s
}
encoding, _ := charset.Lookup(toEncoding)
if encoding == nil {
return ""
}
e := encoding.NewEncoder()
s2, _ := e.String(s)
return s2
}
func containsOneOf(s string, substrs []string) bool {
for _, substr := range substrs {
if strings.Contains(s, substr) {
return true
}
}
return false
}
func stringInSlice(s string, slice []string) bool {
for _, v := range slice {
if v == s {
return true
}
}
return false
}
func stringInSliceOrDefault(s, def string, validStrings []string) string {
if stringInSlice(s, validStrings) {
return s
}
return def
}
type ThrottledStringChannel struct {
in chan string
Input chan<- string
out chan string
Output <-chan string
*rate.Limiter
}
func NewThrottledStringChannel(wrappedChan chan string, limiter *rate.Limiter) *ThrottledStringChannel {
out := make(chan string, 50)
c := &ThrottledStringChannel{
in: wrappedChan,
Input: wrappedChan,
out: out,
Output: out,
Limiter: limiter,
}
go c.run()
return c
}
func (c *ThrottledStringChannel) run() {
for msg := range c.in {
// start := time.Now()
c.Wait(context.Background())
c.out <- msg
// elapsed := time.Since(start)
// fmt.Printf("waited %v to send %v\n", elapsed, msg)
}
close(c.out)
}
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