d1f17fa7e0
Move all (almost all) Go files in middleware into their own packages. This makes for better naming and discoverability. Lot of changes elsewhere to make this change. The middleware.State was renamed to request.Request which is better, but still does not cover all use-cases. It was also moved out middleware because it is used by `dnsserver` as well. A pkg/dnsutil packages was added for shared, handy, dns util functions. All normalize functions are now put in normalize.go
115 lines
3.1 KiB
Go
115 lines
3.1 KiB
Go
package replacer
|
|
|
|
import (
|
|
"strconv"
|
|
"strings"
|
|
"time"
|
|
|
|
"github.com/miekg/coredns/middleware/pkg/dnsrecorder"
|
|
"github.com/miekg/coredns/request"
|
|
|
|
"github.com/miekg/dns"
|
|
)
|
|
|
|
// Replacer is a type which can replace placeholder
|
|
// substrings in a string with actual values from a
|
|
// dns.Msg and responseRecorder. Always use
|
|
// NewReplacer to get one of these.
|
|
type Replacer interface {
|
|
Replace(string) string
|
|
Set(key, value string)
|
|
}
|
|
|
|
type replacer struct {
|
|
replacements map[string]string
|
|
emptyValue string
|
|
}
|
|
|
|
// New makes a new replacer based on r and rr.
|
|
// Do not create a new replacer until r and rr have all
|
|
// the needed values, because this function copies those
|
|
// values into the replacer. rr may be nil if it is not
|
|
// available. emptyValue should be the string that is used
|
|
// in place of empty string (can still be empty string).
|
|
func New(r *dns.Msg, rr *dnsrecorder.Recorder, emptyValue string) Replacer {
|
|
req := request.Request{W: rr, Req: r}
|
|
rep := replacer{
|
|
replacements: map[string]string{
|
|
"{type}": req.Type(),
|
|
"{name}": req.Name(),
|
|
"{class}": req.Class(),
|
|
"{proto}": req.Proto(),
|
|
"{when}": func() string {
|
|
return time.Now().Format(timeFormat)
|
|
}(),
|
|
"{remote}": req.IP(),
|
|
"{port}": req.Port(),
|
|
},
|
|
emptyValue: emptyValue,
|
|
}
|
|
if rr != nil {
|
|
rcode := dns.RcodeToString[rr.Rcode]
|
|
if rcode == "" {
|
|
rcode = strconv.Itoa(rr.Rcode)
|
|
}
|
|
rep.replacements["{rcode}"] = rcode
|
|
rep.replacements["{size}"] = strconv.Itoa(rr.Size)
|
|
rep.replacements["{duration}"] = time.Since(rr.Start).String()
|
|
}
|
|
|
|
// Header placeholders (case-insensitive)
|
|
rep.replacements[headerReplacer+"id}"] = strconv.Itoa(int(r.Id))
|
|
rep.replacements[headerReplacer+"opcode}"] = strconv.Itoa(int(r.Opcode))
|
|
rep.replacements[headerReplacer+"do}"] = boolToString(req.Do())
|
|
rep.replacements[headerReplacer+"bufsize}"] = strconv.Itoa(req.Size())
|
|
|
|
return rep
|
|
}
|
|
|
|
// Replace performs a replacement of values on s and returns
|
|
// the string with the replaced values.
|
|
func (r replacer) Replace(s string) string {
|
|
// Header replacements - these are case-insensitive, so we can't just use strings.Replace()
|
|
for strings.Contains(s, headerReplacer) {
|
|
idxStart := strings.Index(s, headerReplacer)
|
|
endOffset := idxStart + len(headerReplacer)
|
|
idxEnd := strings.Index(s[endOffset:], "}")
|
|
if idxEnd > -1 {
|
|
placeholder := strings.ToLower(s[idxStart : endOffset+idxEnd+1])
|
|
replacement := r.replacements[placeholder]
|
|
if replacement == "" {
|
|
replacement = r.emptyValue
|
|
}
|
|
s = s[:idxStart] + replacement + s[endOffset+idxEnd+1:]
|
|
} else {
|
|
break
|
|
}
|
|
}
|
|
|
|
// Regular replacements - these are easier because they're case-sensitive
|
|
for placeholder, replacement := range r.replacements {
|
|
if replacement == "" {
|
|
replacement = r.emptyValue
|
|
}
|
|
s = strings.Replace(s, placeholder, replacement, -1)
|
|
}
|
|
|
|
return s
|
|
}
|
|
|
|
// Set sets key to value in the replacements map.
|
|
func (r replacer) Set(key, value string) {
|
|
r.replacements["{"+key+"}"] = value
|
|
}
|
|
|
|
func boolToString(b bool) string {
|
|
if b {
|
|
return "true"
|
|
}
|
|
return "false"
|
|
}
|
|
|
|
const (
|
|
timeFormat = "02/Jan/2006:15:04:05 -0700"
|
|
headerReplacer = "{>"
|
|
)
|