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package controllers
import (
"encoding/base64"
"encoding/json"
"log"
"net/http"
"strings"
"github.com/gin-gonic/gin"
"code.crute.me/mcrute/go_ddns_manager/dns"
"code.crute.me/mcrute/go_ddns_manager/util"
"code.crute.me/mcrute/go_ddns_manager/web/middleware"
)
type AcmeChallenge struct {
Zone string `json:"zone" binding:"required"`
Challenge string `json:"challenge" binding:"required"`
}
type AcmeChallengeID struct {
Zone string
Prefix string
Challenge string
}
func DecodeAcmeChallengeID(v string) *AcmeChallengeID {
rid, err := base64.URLEncoding.DecodeString(v)
if err != nil {
return nil
}
var id AcmeChallengeID
if err = json.Unmarshal(rid, &id); err != nil {
return nil
}
return &id
}
func (i AcmeChallengeID) Encode() string {
id, err := json.Marshal(i)
if err != nil {
return ""
}
return base64.URLEncoding.EncodeToString(id)
}
func joinDomainParts(parts ...string) string {
p := []string{}
for _, i := range parts {
if strings.TrimSpace(i) != "" {
p = append(p, i)
}
}
return strings.Join(p, ".")
}
func jsonError(c *gin.Context, status int, msg interface{}) {
var o string
switch msg := msg.(type) {
case string:
o = msg
case error:
o = msg.Error()
}
c.JSON(status, gin.H{"error": o})
}
func CreateAcmeChallenge(c *gin.Context) {
cfg := middleware.GetServerConfig(c)
var ch AcmeChallenge
if err := c.ShouldBindJSON(&ch); err != nil {
jsonError(c, http.StatusBadRequest, err)
return
}
zone, prefix := cfg.BindConfig.FindClosestZone(ch.Zone, cfg.AcmeView)
if zone == nil {
jsonError(c, http.StatusNotFound, "Zone not found")
return
}
if !cfg.IsAcmeClientAllowed(middleware.GetAcmeAuthContext(c), zone.Name) {
jsonError(c, http.StatusForbidden, "Zone update not allowed")
return
}
txn := cfg.DNSClient.StartUpdate(zone).Upsert(&dns.TXT{
Name: joinDomainParts("_acme-challenge", prefix),
Ttl: 5,
Txt: []string{ch.Challenge},
})
if err := cfg.DNSClient.SendUpdate(txn); err != nil {
log.Printf("error Insert: %s", err)
jsonError(c, http.StatusInternalServerError, err)
return
}
url := util.MakeURL(c.Request, "/acme/%s", AcmeChallengeID{
Zone: zone.Name,
Prefix: prefix,
Challenge: ch.Challenge,
}.Encode()).String()
c.Writer.Header().Set("Location", url)
c.JSON(http.StatusCreated, gin.H{"created": url})
}
func DeleteAcmeChallenge(c *gin.Context) {
cfg := middleware.GetServerConfig(c)
id := DecodeAcmeChallengeID(c.Param("id"))
if id == nil {
jsonError(c, http.StatusBadRequest, "unable to decode ID")
return
}
zone := cfg.BindConfig.Zone(cfg.AcmeView, id.Zone)
if zone == nil {
jsonError(c, http.StatusNotFound, "Zone not found")
return
}
if !cfg.IsAcmeClientAllowed(middleware.GetAcmeAuthContext(c), zone.Name) {
jsonError(c, http.StatusForbidden, "Zone update not allowed")
return
}
txn := cfg.DNSClient.StartUpdate(zone).Remove(&dns.TXT{
Name: joinDomainParts("_acme-challenge", id.Prefix),
Ttl: 5,
Txt: []string{id.Challenge},
})
if err := cfg.DNSClient.SendUpdate(txn); err != nil {
log.Printf("error Remove: %s", err)
jsonError(c, http.StatusInternalServerError, err)
return
}
c.String(http.StatusNoContent, "")
}
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