mirror of https://github.com/mpolden/echoip
410 lines
11 KiB
Go
410 lines
11 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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"path/filepath"
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"strings"
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"github.com/mpolden/echoip/iputil"
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"github.com/mpolden/echoip/iputil/geo"
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"github.com/mpolden/echoip/useragent"
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"net/http/pprof"
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"math/big"
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"net"
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"net/http"
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"strconv"
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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 Server struct {
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Template string
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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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cache *Cache
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gr geo.Reader
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profile bool
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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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CountryISO string `json:"country_iso,omitempty"`
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CountryEU *bool `json:"country_eu,omitempty"`
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RegionName string `json:"region_name,omitempty"`
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RegionCode string `json:"region_code,omitempty"`
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MetroCode uint `json:"metro_code,omitempty"`
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PostalCode string `json:"zip_code,omitempty"`
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City string `json:"city,omitempty"`
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Latitude float64 `json:"latitude,omitempty"`
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Longitude float64 `json:"longitude,omitempty"`
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Timezone string `json:"time_zone,omitempty"`
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ASN string `json:"asn,omitempty"`
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ASNOrg string `json:"asn_org,omitempty"`
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Hostname string `json:"hostname,omitempty"`
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UserAgent *useragent.UserAgent `json:"user_agent,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 geo.Reader, cache *Cache, profile bool) *Server {
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return &Server{cache: cache, gr: db, profile: profile}
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}
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func ipFromForwardedForHeader(v string) string {
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sep := strings.Index(v, ",")
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if sep == -1 {
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return v
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}
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return v[:sep]
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}
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// ipFromRequest detects the IP address for this transaction.
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//
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// * `headers` - the specific HTTP headers to trust
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// * `r` - the incoming HTTP request
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// * `customIP` - whether to allow the IP to be pulled from query parameters
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func ipFromRequest(headers []string, r *http.Request, customIP bool) (net.IP, error) {
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remoteIP := ""
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if customIP && r.URL != nil {
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if v, ok := r.URL.Query()["ip"]; ok {
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remoteIP = v[0]
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}
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}
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if remoteIP == "" {
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for _, header := range headers {
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remoteIP = r.Header.Get(header)
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if http.CanonicalHeaderKey(header) == "X-Forwarded-For" {
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remoteIP = ipFromForwardedForHeader(remoteIP)
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}
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if remoteIP != "" {
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break
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}
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}
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}
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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 userAgentFromRequest(r *http.Request) *useragent.UserAgent {
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var userAgent *useragent.UserAgent
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userAgentRaw := r.UserAgent()
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if userAgentRaw != "" {
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parsed := useragent.Parse(userAgentRaw)
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userAgent = &parsed
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}
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return userAgent
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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.IPHeaders, r, true)
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if err != nil {
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return Response{}, err
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}
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response, ok := s.cache.Get(ip)
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if ok {
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// Not Caching the userAgent as it can vary for a given IP
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response.UserAgent = userAgentFromRequest(r)
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return *response, nil
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}
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ipDecimal := iputil.ToDecimal(ip)
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country, _ := s.gr.Country(ip)
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city, _ := s.gr.City(ip)
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asn, _ := s.gr.ASN(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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}
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var autonomousSystemNumber string
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if asn.AutonomousSystemNumber > 0 {
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autonomousSystemNumber = fmt.Sprintf("AS%d", asn.AutonomousSystemNumber)
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}
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response = &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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CountryEU: country.IsEU,
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RegionName: city.RegionName,
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RegionCode: city.RegionCode,
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MetroCode: city.MetroCode,
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PostalCode: city.PostalCode,
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City: city.Name,
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Latitude: city.Latitude,
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Longitude: city.Longitude,
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Timezone: city.Timezone,
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ASN: autonomousSystemNumber,
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ASNOrg: asn.AutonomousSystemOrganization,
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Hostname: hostname,
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}
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s.cache.Set(ip, response)
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response.UserAgent = userAgentFromRequest(r)
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return *response, nil
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}
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func (s *Server) newPortResponse(r *http.Request) (PortResponse, error) {
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lastElement := filepath.Base(r.URL.Path)
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port, err := strconv.ParseUint(lastElement, 10, 16)
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if err != nil || port < 1 || port > 65535 {
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return PortResponse{Port: port}, fmt.Errorf("invalid port: %s", lastElement)
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}
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ip, err := ipFromRequest(s.IPHeaders, r, false)
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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.IPHeaders, r, true)
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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) CLICoordinatesHandler(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.Fprintf(w, "%s,%s\n", formatCoordinate(response.Latitude), formatCoordinate(response.Longitude))
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return nil
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}
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func (s *Server) CLIASNHandler(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.Fprintf(w, "%s\n", response.ASN)
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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) HealthHandler(w http.ResponseWriter, r *http.Request) *appError {
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w.Header().Set("Content-Type", jsonMediaType)
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w.Write([]byte(`{"status":"OK"}`))
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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(err.Error()).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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BoxLatTop float64
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BoxLatBottom float64
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BoxLonLeft float64
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BoxLonRight float64
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JSON string
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Port bool
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}{
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response,
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r.Host,
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response.Latitude + 0.05,
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response.Latitude - 0.05,
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response.Longitude - 0.05,
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response.Longitude + 0.05,
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string(json),
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s.LookupPort != nil,
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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 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) bool {
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ua := useragent.Parse(r.UserAgent())
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switch ua.Product {
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case "curl", "HTTPie", "httpie-go", "Wget", "fetch libfetch", "Go", "Go-http-client", "ddclient", "Mikrotik":
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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 wrapHandlerFunc(f http.HandlerFunc) appHandler {
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return func(w http.ResponseWriter, r *http.Request) *appError {
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f.ServeHTTP(w, r)
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return nil
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}
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}
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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 := NewRouter()
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// Health
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r.Route("GET", "/health", s.HealthHandler)
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// JSON
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r.Route("GET", "/", s.JSONHandler).Header("Accept", jsonMediaType)
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r.Route("GET", "/json", s.JSONHandler)
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// CLI
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r.Route("GET", "/", s.CLIHandler).MatcherFunc(cliMatcher)
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r.Route("GET", "/", s.CLIHandler).Header("Accept", textMediaType)
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r.Route("GET", "/ip", s.CLIHandler)
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if !s.gr.IsEmpty() {
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r.Route("GET", "/country", s.CLICountryHandler)
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r.Route("GET", "/country-iso", s.CLICountryISOHandler)
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r.Route("GET", "/city", s.CLICityHandler)
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r.Route("GET", "/coordinates", s.CLICoordinatesHandler)
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r.Route("GET", "/asn", s.CLIASNHandler)
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}
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// Browser
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if s.Template != "" {
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r.Route("GET", "/", s.DefaultHandler)
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}
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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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// Profiling
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if s.profile {
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r.Route("GET", "/debug/pprof/cmdline", wrapHandlerFunc(pprof.Cmdline))
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r.Route("GET", "/debug/pprof/profile", wrapHandlerFunc(pprof.Profile))
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r.Route("GET", "/debug/pprof/symbol", wrapHandlerFunc(pprof.Symbol))
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r.Route("GET", "/debug/pprof/trace", wrapHandlerFunc(pprof.Trace))
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r.RoutePrefix("GET", "/debug/pprof/", wrapHandlerFunc(pprof.Index))
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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 {
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return http.ListenAndServe(addr, s.Handler())
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}
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func formatCoordinate(c float64) string {
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return strconv.FormatFloat(c, 'f', 6, 64)
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}
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