86 lines
2.0 KiB
Go
86 lines
2.0 KiB
Go
package router
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import (
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"fmt"
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"net"
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"net/http"
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"strings"
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validator "github.com/dcarrillo/whatismyip/internal/validator/uuid"
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"github.com/dcarrillo/whatismyip/service"
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"github.com/gin-gonic/gin"
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"github.com/google/uuid"
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"github.com/patrickmn/go-cache"
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)
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type DNSJSONResponse struct {
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DNS dnsData `json:"dns"`
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}
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type dnsData struct {
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IP string `json:"ip"`
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Country string `json:"country"`
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AsnOrganization string `json:"provider"`
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}
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// TODO
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// Implement a proper vhost manager instead of using a middleware
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func GetDNSDiscoveryHandler(store *cache.Cache, domain string, redirectPort string) gin.HandlerFunc {
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return func(ctx *gin.Context) {
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if !strings.HasSuffix(ctx.Request.Host, domain) {
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ctx.Next()
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return
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}
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if ctx.Request.Host == domain {
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ctx.Redirect(http.StatusFound, fmt.Sprintf("http://%s.%s%s", uuid.New().String(), domain, redirectPort))
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ctx.Abort()
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return
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}
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handleDNS(ctx, store)
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ctx.Abort()
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}
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}
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func handleDNS(ctx *gin.Context, store *cache.Cache) {
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d := strings.Split(ctx.Request.Host, ".")[0]
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if !validator.IsValid(d) {
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ctx.String(http.StatusNotFound, http.StatusText(http.StatusNotFound))
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return
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}
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v, found := store.Get(d)
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if !found {
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ctx.String(http.StatusNotFound, http.StatusText(http.StatusNotFound))
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return
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}
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ipStr, ok := v.(string)
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if !ok {
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ctx.String(http.StatusNotFound, http.StatusText(http.StatusNotFound))
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return
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}
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ip := net.ParseIP(ipStr)
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if ip == nil {
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ctx.String(http.StatusNotFound, http.StatusText(http.StatusNotFound))
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return
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}
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geo := service.Geo{IP: ip}
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j := DNSJSONResponse{
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DNS: dnsData{
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IP: ipStr,
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Country: geo.LookUpCity().Country.Names["en"],
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AsnOrganization: geo.LookUpASN().AutonomousSystemOrganization,
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},
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}
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switch ctx.NegotiateFormat(gin.MIMEPlain, gin.MIMEHTML, gin.MIMEJSON) {
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case gin.MIMEJSON:
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ctx.JSON(http.StatusOK, j)
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default:
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ctx.String(http.StatusOK, fmt.Sprintf("%s (%s / %s)\n", j.DNS.IP, j.DNS.Country, j.DNS.AsnOrganization))
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}
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}
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