mirror of
https://github.com/mpolden/echoip.git
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266 lines
6.2 KiB
Go
266 lines
6.2 KiB
Go
package api
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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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"io"
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"github.com/mpolden/ipd/useragent"
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"github.com/sirupsen/logrus"
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"math/big"
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"net"
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"net/http"
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"path/filepath"
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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 API struct {
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Template string
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IPHeader string
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oracle Oracle
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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 *big.Int `json:"ip_decimal"`
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Country string `json:"country,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(oracle Oracle, logger *logrus.Logger) *API {
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return &API{oracle: oracle, log: logger}
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}
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func ipToDecimal(ip net.IP) *big.Int {
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i := big.NewInt(0)
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if to4 := ip.To4(); to4 != nil {
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i.SetBytes(to4)
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} else {
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i.SetBytes(ip)
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}
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return i
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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 (a *API) newResponse(r *http.Request) (Response, error) {
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ip, err := ipFromRequest(a.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 := ipToDecimal(ip)
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country, err := a.oracle.LookupCountry(ip)
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if err != nil {
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a.log.Debug(err)
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}
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city, err := a.oracle.LookupCity(ip)
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if err != nil {
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a.log.Debug(err)
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}
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hostnames, err := a.oracle.LookupAddr(ip)
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if err != nil {
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a.log.Debug(err)
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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,
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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 (a *API) 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(a.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 = a.oracle.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 (a *API) CLIHandler(w http.ResponseWriter, r *http.Request) *appError {
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ip, err := ipFromRequest(a.IPHeader, r)
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if err != nil {
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return internalServerError(err)
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}
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io.WriteString(w, ip.String()+"\n")
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return nil
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}
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func (a *API) CLICountryHandler(w http.ResponseWriter, r *http.Request) *appError {
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response, err := a.newResponse(r)
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if err != nil {
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return internalServerError(err)
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}
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io.WriteString(w, response.Country+"\n")
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return nil
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}
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func (a *API) CLICityHandler(w http.ResponseWriter, r *http.Request) *appError {
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response, err := a.newResponse(r)
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if err != nil {
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return internalServerError(err)
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}
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io.WriteString(w, response.City+"\n")
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return nil
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}
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func (a *API) JSONHandler(w http.ResponseWriter, r *http.Request) *appError {
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response, err := a.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 (a *API) PortHandler(w http.ResponseWriter, r *http.Request) *appError {
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response, err := a.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 (a *API) DefaultHandler(w http.ResponseWriter, r *http.Request) *appError {
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response, err := a.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.New(filepath.Base(a.Template)).ParseFiles(a.Template)
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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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Oracle
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}{response, a.oracle}
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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 (a *API) 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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io.WriteString(w, e.Message)
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}
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}
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func (a *API) Router() http.Handler {
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r := mux.NewRouter()
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// JSON
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r.Handle("/", appHandler(a.JSONHandler)).Methods("GET").Headers("Accept", jsonMediaType)
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r.Handle("/json", appHandler(a.JSONHandler)).Methods("GET")
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// CLI
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r.Handle("/", appHandler(a.CLIHandler)).Methods("GET").MatcherFunc(cliMatcher)
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r.Handle("/", appHandler(a.CLIHandler)).Methods("GET").Headers("Accept", textMediaType)
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r.Handle("/ip", appHandler(a.CLIHandler)).Methods("GET")
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r.Handle("/country", appHandler(a.CLICountryHandler)).Methods("GET")
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r.Handle("/city", appHandler(a.CLICityHandler)).Methods("GET")
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// Browser
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r.Handle("/", appHandler(a.DefaultHandler)).Methods("GET")
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// Port testing
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r.Handle("/port/{port:[0-9]+}", appHandler(a.PortHandler)).Methods("GET")
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// Not found handler which returns JSON when appropriate
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r.NotFoundHandler = appHandler(a.NotFoundHandler)
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return r
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}
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