mirror of https://github.com/mpolden/echoip
297 lines
7.1 KiB
Go
297 lines
7.1 KiB
Go
package http
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import (
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"encoding/json"
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"fmt"
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"html/template"
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"github.com/mpolden/ipd/iputil"
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"github.com/mpolden/ipd/iputil/db"
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"github.com/mpolden/ipd/useragent"
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"github.com/sirupsen/logrus"
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"net"
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"net/http"
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"strconv"
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"strings"
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"github.com/gorilla/mux"
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)
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const (
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jsonMediaType = "application/json"
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textMediaType = "text/plain"
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)
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type LookupAddr func(net.IP) ([]string, error)
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type LookupPort func(net.IP, uint64) error
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type Server struct {
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Template string
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IPHeader string
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lookupAddr LookupAddr
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lookupPort LookupPort
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db db.Database
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log *logrus.Logger
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}
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type Response struct {
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IP net.IP `json:"ip"`
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IPDecimal uint64 `json:"ip_decimal"`
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Country string `json:"country,omitempty"`
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CountryISO string `json:"country_iso,omitempty"`
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City string `json:"city,omitempty"`
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Hostname string `json:"hostname,omitempty"`
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}
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type PortResponse struct {
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IP net.IP `json:"ip"`
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Port uint64 `json:"port"`
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Reachable bool `json:"reachable"`
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}
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func New(db db.Database, lookupAddr LookupAddr, lookupPort LookupPort, log *logrus.Logger) *Server {
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return &Server{lookupAddr: lookupAddr, lookupPort: lookupPort, db: db, log: log}
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}
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func ipFromRequest(header string, r *http.Request) (net.IP, error) {
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remoteIP := r.Header.Get(header)
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if remoteIP == "" {
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host, _, err := net.SplitHostPort(r.RemoteAddr)
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if err != nil {
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return nil, err
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}
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remoteIP = host
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}
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ip := net.ParseIP(remoteIP)
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if ip == nil {
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return nil, fmt.Errorf("could not parse IP: %s", remoteIP)
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}
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return ip, nil
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}
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func (s *Server) newResponse(r *http.Request) (Response, error) {
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ip, err := ipFromRequest(s.IPHeader, r)
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if err != nil {
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return Response{}, err
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}
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ipDecimal := iputil.ToDecimal(ip)
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country, err := s.db.Country(ip)
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if err != nil {
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s.log.Debug(err)
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}
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city, err := s.db.City(ip)
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if err != nil {
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s.log.Debug(err)
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}
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var hostnames []string
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if s.lookupAddr != nil {
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h, err := s.lookupAddr(ip)
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if err != nil {
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s.log.Debug(err)
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}
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hostnames = h
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}
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return Response{
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IP: ip,
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IPDecimal: ipDecimal,
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Country: country.Name,
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CountryISO: country.ISO,
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City: city,
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Hostname: strings.Join(hostnames, " "),
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}, nil
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}
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func (s *Server) newPortResponse(r *http.Request) (PortResponse, error) {
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vars := mux.Vars(r)
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port, err := strconv.ParseUint(vars["port"], 10, 16)
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if err != nil {
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return PortResponse{Port: port}, err
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}
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if port < 1 || port > 65355 {
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return PortResponse{Port: port}, fmt.Errorf("invalid port: %d", port)
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}
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ip, err := ipFromRequest(s.IPHeader, r)
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if err != nil {
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return PortResponse{Port: port}, err
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}
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err = s.lookupPort(ip, port)
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return PortResponse{
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IP: ip,
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Port: port,
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Reachable: err == nil,
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}, nil
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}
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func (s *Server) CLIHandler(w http.ResponseWriter, r *http.Request) *appError {
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ip, err := ipFromRequest(s.IPHeader, r)
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if err != nil {
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return internalServerError(err)
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}
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fmt.Fprintln(w, ip.String())
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return nil
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}
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func (s *Server) CLICountryHandler(w http.ResponseWriter, r *http.Request) *appError {
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response, err := s.newResponse(r)
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if err != nil {
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return internalServerError(err)
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}
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fmt.Fprintln(w, response.Country)
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return nil
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}
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func (s *Server) CLICountryISOHandler(w http.ResponseWriter, r *http.Request) *appError {
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response, err := s.newResponse(r)
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if err != nil {
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return internalServerError(err)
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}
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fmt.Fprintln(w, response.CountryISO)
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return nil
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}
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func (s *Server) CLICityHandler(w http.ResponseWriter, r *http.Request) *appError {
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response, err := s.newResponse(r)
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if err != nil {
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return internalServerError(err)
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}
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fmt.Fprintln(w, response.City)
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return nil
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}
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func (s *Server) JSONHandler(w http.ResponseWriter, r *http.Request) *appError {
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response, err := s.newResponse(r)
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if err != nil {
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return internalServerError(err).AsJSON()
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}
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b, err := json.Marshal(response)
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if err != nil {
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return internalServerError(err).AsJSON()
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}
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w.Header().Set("Content-Type", jsonMediaType)
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w.Write(b)
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return nil
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}
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func (s *Server) PortHandler(w http.ResponseWriter, r *http.Request) *appError {
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response, err := s.newPortResponse(r)
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if err != nil {
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return badRequest(err).WithMessage(fmt.Sprintf("Invalid port: %d", response.Port)).AsJSON()
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}
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b, err := json.Marshal(response)
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if err != nil {
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return internalServerError(err).AsJSON()
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}
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w.Header().Set("Content-Type", jsonMediaType)
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w.Write(b)
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return nil
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}
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func (s *Server) DefaultHandler(w http.ResponseWriter, r *http.Request) *appError {
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response, err := s.newResponse(r)
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if err != nil {
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return internalServerError(err)
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}
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t, err := template.ParseFiles(s.Template)
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if err != nil {
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return internalServerError(err)
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}
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json, err := json.MarshalIndent(response, "", " ")
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if err != nil {
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return internalServerError(err)
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}
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var data = struct {
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Response
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Host string
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JSON string
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Port bool
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Map bool
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}{
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response,
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r.Host,
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string(json),
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s.lookupPort != nil,
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response.Country != "" && response.City != "",
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}
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if err := t.Execute(w, &data); err != nil {
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return internalServerError(err)
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}
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return nil
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}
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func (s *Server) NotFoundHandler(w http.ResponseWriter, r *http.Request) *appError {
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err := notFound(nil).WithMessage("404 page not found")
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if r.Header.Get("accept") == jsonMediaType {
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err = err.AsJSON()
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}
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return err
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}
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func cliMatcher(r *http.Request, rm *mux.RouteMatch) bool {
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ua := useragent.Parse(r.UserAgent())
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switch ua.Product {
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case "curl", "HTTPie", "Wget", "fetch libfetch", "Go", "Go-http-client", "ddclient":
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return true
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}
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return false
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}
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type appHandler func(http.ResponseWriter, *http.Request) *appError
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func (fn appHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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if e := fn(w, r); e != nil { // e is *appError
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// When Content-Type for error is JSON, we need to marshal the response into JSON
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if e.IsJSON() {
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var data = struct {
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Error string `json:"error"`
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}{e.Message}
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b, err := json.Marshal(data)
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if err != nil {
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panic(err)
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}
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e.Message = string(b)
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}
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// Set Content-Type of response if set in error
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if e.ContentType != "" {
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w.Header().Set("Content-Type", e.ContentType)
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}
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w.WriteHeader(e.Code)
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fmt.Fprint(w, e.Message)
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}
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}
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func (s *Server) Handler() http.Handler {
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r := mux.NewRouter()
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// JSON
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r.Handle("/", appHandler(s.JSONHandler)).Methods("GET").Headers("Accept", jsonMediaType)
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r.Handle("/json", appHandler(s.JSONHandler)).Methods("GET")
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// CLI
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r.Handle("/", appHandler(s.CLIHandler)).Methods("GET").MatcherFunc(cliMatcher)
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r.Handle("/", appHandler(s.CLIHandler)).Methods("GET").Headers("Accept", textMediaType)
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r.Handle("/ip", appHandler(s.CLIHandler)).Methods("GET")
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if !s.db.IsEmpty() {
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r.Handle("/country", appHandler(s.CLICountryHandler)).Methods("GET")
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r.Handle("/country-iso", appHandler(s.CLICountryISOHandler)).Methods("GET")
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r.Handle("/city", appHandler(s.CLICityHandler)).Methods("GET")
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}
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// Browser
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r.Handle("/", appHandler(s.DefaultHandler)).Methods("GET")
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// Port testing
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if s.lookupPort != nil {
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r.Handle("/port/{port:[0-9]+}", appHandler(s.PortHandler)).Methods("GET")
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}
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// Not found handler which returns JSON when appropriate
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r.NotFoundHandler = appHandler(s.NotFoundHandler)
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return r
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}
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func (s *Server) ListenAndServe(addr string) error {
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return http.ListenAndServe(addr, s.Handler())
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}
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