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|
package template
import (
"regexp"
gotmpl "text/template"
"github.com/coredns/caddy"
"github.com/coredns/coredns/core/dnsserver"
"github.com/coredns/coredns/plugin"
"github.com/coredns/coredns/plugin/pkg/upstream"
"github.com/miekg/dns"
)
func init() { plugin.Register("template", setupTemplate) }
func setupTemplate(c *caddy.Controller) error {
handler, err := templateParse(c)
if err != nil {
return plugin.Error("template", err)
}
dnsserver.GetConfig(c).AddPlugin(func(next plugin.Handler) plugin.Handler {
handler.Next = next
return handler
})
return nil
}
func templateParse(c *caddy.Controller) (handler Handler, err error) {
handler.Templates = make([]template, 0)
for c.Next() {
if !c.NextArg() {
return handler, c.ArgErr()
}
class, ok := dns.StringToClass[c.Val()]
if !ok {
return handler, c.Errf("invalid query class %s", c.Val())
}
if !c.NextArg() {
return handler, c.ArgErr()
}
qtype, ok := dns.StringToType[c.Val()]
if !ok {
return handler, c.Errf("invalid RR class %s", c.Val())
}
zones := c.RemainingArgs()
if len(zones) == 0 {
zones = make([]string, len(c.ServerBlockKeys))
copy(zones, c.ServerBlockKeys)
}
for i, str := range zones {
zones[i] = plugin.Host(str).Normalize()
}
handler.Zones = append(handler.Zones, zones...)
t := template{qclass: class, qtype: qtype, zones: zones}
t.regex = make([]*regexp.Regexp, 0)
templatePrefix := ""
t.answer = make([]*gotmpl.Template, 0)
t.upstream = upstream.New()
for c.NextBlock() {
switch c.Val() {
case "match":
args := c.RemainingArgs()
if len(args) == 0 {
return handler, c.ArgErr()
}
for _, regex := range args {
r, err := regexp.Compile(regex)
if err != nil {
return handler, c.Errf("could not parse regex: %s, %v", regex, err)
}
templatePrefix = templatePrefix + regex + " "
t.regex = append(t.regex, r)
}
case "answer":
args := c.RemainingArgs()
if len(args) == 0 {
return handler, c.ArgErr()
}
for _, answer := range args {
tmpl, err := gotmpl.New("answer").Parse(answer)
if err != nil {
return handler, c.Errf("could not compile template: %s, %v", c.Val(), err)
}
t.answer = append(t.answer, tmpl)
}
case "additional":
args := c.RemainingArgs()
if len(args) == 0 {
return handler, c.ArgErr()
}
for _, additional := range args {
tmpl, err := gotmpl.New("additional").Parse(additional)
if err != nil {
return handler, c.Errf("could not compile template: %s, %v\n", c.Val(), err)
}
t.additional = append(t.additional, tmpl)
}
case "authority":
args := c.RemainingArgs()
if len(args) == 0 {
return handler, c.ArgErr()
}
for _, authority := range args {
tmpl, err := gotmpl.New("authority").Parse(authority)
if err != nil {
return handler, c.Errf("could not compile template: %s, %v\n", c.Val(), err)
}
t.authority = append(t.authority, tmpl)
}
case "rcode":
if !c.NextArg() {
return handler, c.ArgErr()
}
rcode, ok := dns.StringToRcode[c.Val()]
if !ok {
return handler, c.Errf("unknown rcode %s", c.Val())
}
t.rcode = rcode
case "fallthrough":
t.fall.SetZonesFromArgs(c.RemainingArgs())
case "upstream":
// remove soon
c.RemainingArgs()
default:
return handler, c.ArgErr()
}
}
if len(t.regex) == 0 {
t.regex = append(t.regex, regexp.MustCompile(".*"))
}
handler.Templates = append(handler.Templates, t)
}
return
}
|
