78 lines
1.6 KiB
Go
78 lines
1.6 KiB
Go
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package khatru
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import (
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"net"
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"net/http"
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"strconv"
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"strings"
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"github.com/nbd-wtf/go-nostr"
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)
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func isOlder(previous, next *nostr.Event) bool {
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return previous.CreatedAt < next.CreatedAt ||
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(previous.CreatedAt == next.CreatedAt && previous.ID > next.ID)
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}
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func getServiceBaseURL(r *http.Request) string {
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host := r.Header.Get("X-Forwarded-Host")
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if host == "" {
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host = r.Host
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}
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proto := r.Header.Get("X-Forwarded-Proto")
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if proto == "" {
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if host == "localhost" {
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proto = "http"
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} else if strings.Index(host, ":") != -1 {
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// has a port number
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proto = "http"
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} else if _, err := strconv.Atoi(strings.ReplaceAll(host, ".", "")); err == nil {
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// it's a naked IP
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proto = "http"
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} else {
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proto = "https"
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}
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}
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return proto + "://" + host
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}
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var privateMasks = func() []net.IPNet {
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privateCIDRs := []string{
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"127.0.0.0/8",
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"10.0.0.0/8",
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"172.16.0.0/12",
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"192.168.0.0/16",
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"fc00::/7",
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}
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masks := make([]net.IPNet, len(privateCIDRs))
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for i, cidr := range privateCIDRs {
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_, netw, err := net.ParseCIDR(cidr)
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if err != nil {
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return nil
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}
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masks[i] = *netw
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}
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return masks
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}()
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func isPrivate(ip net.IP) bool {
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for _, mask := range privateMasks {
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if mask.Contains(ip) {
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return true
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}
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}
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return false
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}
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func GetIPFromRequest(r *http.Request) string {
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if xffh := r.Header.Get("X-Forwarded-For"); xffh != "" {
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for _, v := range strings.Split(xffh, ",") {
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if ip := net.ParseIP(strings.TrimSpace(v)); ip != nil && ip.IsGlobalUnicast() && !isPrivate(ip) {
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return ip.String()
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}
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}
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}
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ip, _, _ := net.SplitHostPort(r.RemoteAddr)
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return ip
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}
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