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setup.go
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setup.go
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/*
Copyright 2017 - The TXTDirect Authors
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package txtdirect
import (
"fmt"
"io/ioutil"
"log"
"net/http"
"os"
"strings"
lumberjack "gopkg.in/natefinch/lumberjack.v2"
"github.com/caddyserver/caddy"
"github.com/caddyserver/caddy/caddy/caddymain"
"github.com/caddyserver/caddy/caddyhttp/httpserver"
)
func main() {
caddymain.EnableTelemetry = false
caddymain.Run()
}
func init() {
caddy.RegisterPlugin("txtdirect", caddy.Plugin{
ServerType: "http",
Action: setup,
})
// TODO: hardcode directive after stable release into Caddy
httpserver.RegisterDevDirective("txtdirect", "")
}
var allOptions = []string{"host", "path", "gometa", "www"}
func parse(c *caddy.Controller) (Config, error) {
var enable []string
var redirect string
var resolver string
var prometheus Prometheus
var logfile string
var qr Qr
c.Next() // skip directive name
for c.NextBlock() {
option := c.Val()
switch option {
case "disable":
if enable != nil {
return Config{}, c.ArgErr()
}
toDisable := c.RemainingArgs()
if len(toDisable) == 0 {
return Config{}, c.ArgErr()
}
enable = removeArrayFromArray(allOptions, toDisable)
case "enable":
if enable != nil {
return Config{}, c.ArgErr()
}
enable = c.RemainingArgs()
if len(enable) == 0 {
return Config{}, c.ArgErr()
}
case "redirect":
toRedirect := c.RemainingArgs()
if len(toRedirect) != 1 {
return Config{}, c.ArgErr()
}
redirect = toRedirect[0]
case "resolver":
resolverAddr := c.RemainingArgs()
if len(resolverAddr) != 1 {
return Config{}, c.ArgErr()
}
resolver = resolverAddr[0]
case "logfile":
logfile = "stdout"
// Set stdout as the default value
if c.NextArg() {
logfile = c.Val()
}
case "prometheus":
prometheus.Enable = true
c.NextArg()
if c.Val() != "{" {
continue
}
for c.Next() {
if c.Val() == "}" {
break
}
err := prometheus.ParsePrometheus(c, c.Val(), c.RemainingArgs()[0])
if err != nil {
return Config{}, err
}
}
case "qr":
qr.Enable = true
c.NextArg()
if c.Val() != "{" {
continue
}
for c.Next() {
if c.Val() == "}" {
break
}
if err := qr.ParseQr(c); err != nil {
return Config{}, err
}
}
default:
return Config{}, c.ArgErr() // unhandled option
}
}
// If nothing is specified, enable everything
if enable == nil {
enable = allOptions
}
// Set the default values
if prometheus.Enable {
prometheus.SetDefaults()
}
if qr.Enable {
qr.SetDefaults()
}
config := Config{
Enable: enable,
Redirect: redirect,
Resolver: resolver,
LogOutput: logfile,
Prometheus: prometheus,
Qr: qr,
}
parseLogfile(logfile)
return config, nil
}
func setup(c *caddy.Controller) error {
config, err := parse(c)
if err != nil {
return err
}
// Setup and add promethues middleware to caddy
if config.Prometheus.Enable {
config.Prometheus.SetDefaults()
config.Prometheus.Setup(c)
}
// Add handler to Caddy
cfg := httpserver.GetConfig(c)
mid := func(next httpserver.Handler) httpserver.Handler {
return TXTDirect{
Next: next,
Config: config,
}
}
cfg.AddMiddleware(mid)
return nil
}
func removeArrayFromArray(array, toBeRemoved []string) []string {
tmp := make([]string, len(array))
copy(tmp, array)
for _, toRemove := range toBeRemoved {
for i, option := range tmp {
if option == toRemove {
tmp[i] = tmp[len(tmp)-1]
tmp = tmp[:len(tmp)-1]
break
}
}
}
return tmp
}
// Redirect is middleware to redirect requests based on TXT records
type TXTDirect struct {
Next httpserver.Handler
Config Config
}
func (rd TXTDirect) ServeHTTP(w http.ResponseWriter, r *http.Request) (int, error) {
r.URL.Host = strings.ToLower(r.URL.Host)
if err := Redirect(w, r, rd.Config); err != nil {
if err.Error() == "option disabled" {
return rd.Next.ServeHTTP(w, r)
}
return http.StatusInternalServerError, err
}
// Count total redirects if prometheus is enabled and set cache header
if w.Header().Get("Status-Code") == "301" || w.Header().Get("Status-Code") == "302" {
if rd.Config.Prometheus.Enable {
RequestsCount.WithLabelValues(r.Host).Add(1)
}
// Set Cache-Control header on permanent redirects
if w.Header().Get("Status-Code") == "301" {
w.Header().Add("Cache-Control", fmt.Sprintf("max-age=%d", status301CacheAge))
}
}
return 0, nil
}
func parseLogfile(logfile string) {
switch logfile {
case "stdout":
log.SetOutput(os.Stdout)
case "stderr":
log.SetOutput(os.Stderr)
case "":
log.SetOutput(ioutil.Discard)
default:
log.SetOutput(&lumberjack.Logger{
Filename: logfile,
MaxSize: 100,
MaxAge: 14,
MaxBackups: 10,
})
}
}