echoip/http/http.go

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package http
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import (
"encoding/json"
"fmt"
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"html/template"
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"path/filepath"
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"strings"
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"github.com/mpolden/ipd/iputil"
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"github.com/mpolden/ipd/iputil/geo"
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"github.com/mpolden/ipd/useragent"
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"net"
"net/http"
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"strconv"
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)
const (
jsonMediaType = "application/json"
textMediaType = "text/plain"
)
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type Server struct {
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Template string
IPHeaders []string
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LookupAddr func(net.IP) (string, error)
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LookupPort func(net.IP, uint64) error
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gr geo.Reader
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}
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type Response struct {
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IP net.IP `json:"ip"`
IPDecimal uint64 `json:"ip_decimal"`
Country string `json:"country,omitempty"`
CountryISO string `json:"country_iso,omitempty"`
City string `json:"city,omitempty"`
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"`
Port uint64 `json:"port"`
Reachable bool `json:"reachable"`
}
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func New(db geo.Reader) *Server {
return &Server{gr: db}
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}
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func ipFromForwardedForHeader(v string) string {
// Handle both comma and comma+space separator
ips := strings.Fields(strings.Replace(v, ",", " ", -1))
if len(ips) == 0 {
return ""
}
return ips[0]
}
func ipFromRequest(headers []string, r *http.Request) (net.IP, error) {
remoteIP := ""
for _, header := range headers {
remoteIP = r.Header.Get(header)
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if http.CanonicalHeaderKey(header) == "X-Forwarded-For" {
remoteIP = ipFromForwardedForHeader(remoteIP)
}
if remoteIP != "" {
break
}
}
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if remoteIP == "" {
host, _, err := net.SplitHostPort(r.RemoteAddr)
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if err != nil {
return nil, err
}
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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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}
return ip, nil
}
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func (s *Server) newResponse(r *http.Request) (Response, error) {
ip, err := ipFromRequest(s.IPHeaders, 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, _ := s.gr.Country(ip)
city, _ := s.gr.City(ip)
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var hostname string
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if s.LookupAddr != nil {
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hostname, _ = s.LookupAddr(ip)
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}
return Response{
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IP: ip,
IPDecimal: ipDecimal,
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Country: country.Name,
CountryISO: country.ISO,
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City: city,
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Hostname: hostname,
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}, nil
}
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func (s *Server) newPortResponse(r *http.Request) (PortResponse, error) {
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lastElement := filepath.Base(r.URL.Path)
port, err := strconv.ParseUint(lastElement, 10, 16)
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if err != nil || port < 1 || port > 65355 {
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return PortResponse{Port: port}, fmt.Errorf("invalid port: %d", port)
}
ip, err := ipFromRequest(s.IPHeaders, r)
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if err != nil {
return PortResponse{Port: port}, err
}
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err = s.LookupPort(ip, port)
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return PortResponse{
IP: ip,
Port: port,
Reachable: err == nil,
}, nil
}
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func (s *Server) CLIHandler(w http.ResponseWriter, r *http.Request) *appError {
ip, err := ipFromRequest(s.IPHeaders, 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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func (s *Server) CLICountryHandler(w http.ResponseWriter, r *http.Request) *appError {
response, err := s.newResponse(r)
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if err != nil {
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 {
response, err := s.newResponse(r)
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if err != nil {
return internalServerError(err)
}
fmt.Fprintln(w, response.CountryISO)
return nil
}
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func (s *Server) CLICityHandler(w http.ResponseWriter, r *http.Request) *appError {
response, err := s.newResponse(r)
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if err != nil {
return internalServerError(err)
}
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fmt.Fprintln(w, response.City)
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return nil
}
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func (s *Server) JSONHandler(w http.ResponseWriter, r *http.Request) *appError {
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) HealthHandler(w http.ResponseWriter, r *http.Request) *appError {
w.Header().Set("Content-Type", jsonMediaType)
w.Write([]byte(`{"status":"OK"}`))
return nil
}
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func (s *Server) PortHandler(w http.ResponseWriter, r *http.Request) *appError {
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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}
b, err := json.Marshal(response)
if err != nil {
return internalServerError(err).AsJSON()
}
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w.Header().Set("Content-Type", jsonMediaType)
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w.Write(b)
return nil
}
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func (s *Server) DefaultHandler(w http.ResponseWriter, r *http.Request) *appError {
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, "", " ")
if err != nil {
return internalServerError(err)
}
var data = struct {
Response
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Host string
JSON string
Port bool
}{
response,
r.Host,
string(json),
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s.LookupPort != nil,
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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 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()
}
return err
}
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func cliMatcher(r *http.Request) bool {
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ua := useragent.Parse(r.UserAgent())
switch ua.Product {
case "curl", "HTTPie", "Wget", "fetch libfetch", "Go", "Go-http-client", "ddclient":
return true
}
return false
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}
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type appHandler func(http.ResponseWriter, *http.Request) *appError
func (fn appHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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() {
var data = struct {
Error string `json:"error"`
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}{e.Message}
b, err := json.Marshal(data)
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if err != nil {
panic(err)
}
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e.Message = string(b)
}
// Set Content-Type of response if set in error
if e.ContentType != "" {
w.Header().Set("Content-Type", e.ContentType)
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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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func (s *Server) Handler() http.Handler {
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r := NewRouter()
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// Health
r.Route("GET", "/health", s.HealthHandler)
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// JSON
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r.Route("GET", "/", s.JSONHandler).Header("Accept", jsonMediaType)
r.Route("GET", "/json", s.JSONHandler)
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// CLI
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r.Route("GET", "/", s.CLIHandler).MatcherFunc(cliMatcher)
r.Route("GET", "/", s.CLIHandler).Header("Accept", textMediaType)
r.Route("GET", "/ip", s.CLIHandler)
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if !s.gr.IsEmpty() {
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r.Route("GET", "/country", s.CLICountryHandler)
r.Route("GET", "/country-iso", s.CLICountryISOHandler)
r.Route("GET", "/city", s.CLICityHandler)
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}
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// Browser
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r.Route("GET", "/", s.DefaultHandler)
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// Port testing
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if s.LookupPort != nil {
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r.RoutePrefix("GET", "/port/", s.PortHandler)
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}
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return r.Handler()
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}
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func (s *Server) ListenAndServe(addr string) error {
return http.ListenAndServe(addr, s.Handler())
}