81 lines
1.5 KiB
Go
81 lines
1.5 KiB
Go
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package netutil
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import (
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"encoding/json"
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"net"
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"net/http"
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"strings"
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)
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// JSON shorthand for json response
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func JSON(w http.ResponseWriter, value interface{}) (int, error) {
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data, err := json.Marshal(value)
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if err != nil {
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panic(err)
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}
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w.Header().Set("Content-Type", "application/json")
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return w.Write(data)
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}
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// MatchIPGlob match ip to glob pattern, ex. * 192.168.* 192.* 192.168.51.*2*
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func MatchIPGlob(ip, pattern string) bool {
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parts := strings.Split(pattern, ".")
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seg := strings.Split(ip, ".")
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for i, part := range parts {
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// normalize pattern to 3 digits
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switch len(part) {
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case 1:
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if part == "*" {
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part = "***"
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} else {
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part = "00" + part
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}
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case 2:
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if strings.HasPrefix(part, "*") {
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part = "*" + part
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} else if strings.HasSuffix(part, "*") {
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part = part + "*"
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} else {
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part = "0" + part
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}
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}
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// normalize ip to 3 digits
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switch len(seg[i]) {
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case 1:
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seg[i] = "00" + seg[i]
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case 2:
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seg[i] = "0" + seg[i]
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}
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for j := range part {
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if string(part[j]) == "*" {
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continue
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}
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if part[j] != seg[i][j] {
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return false
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}
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}
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}
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return true
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}
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// GetIP gets the real ip (could still be tricked by proxy)
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func GetIP(r *http.Request) string {
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ip := r.Header.Get("X-Real-Ip")
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if ip == "" {
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ips := r.Header.Get("X-Forwarded-For")
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ipArr := strings.Split(ips, ",")
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ip = strings.Trim(ipArr[len(ipArr)-1], " ")
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}
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if ip == "" {
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var err error
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ip, _, err = net.SplitHostPort(r.RemoteAddr)
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if err != nil {
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ip = r.RemoteAddr
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}
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}
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return ip
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}
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