90 lines
2.0 KiB
Go
90 lines
2.0 KiB
Go
package reseed
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import (
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"bytes"
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"crypto/tls"
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"fmt"
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"io"
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"net/http"
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"os"
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"github.com/PuerkitoBio/throttled"
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"github.com/PuerkitoBio/throttled/store"
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"github.com/gorilla/handlers"
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"github.com/justinas/alice"
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)
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const (
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I2P_USER_AGENT = "Wget/1.11.4"
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)
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type Server struct {
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*http.Server
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Reseeder Reseeder
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}
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func NewServer() *Server {
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config := &tls.Config{MinVersion: tls.VersionTLS10}
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h := &http.Server{TLSConfig: config}
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server := Server{h, nil}
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th := throttled.RateLimit(throttled.PerHour(4), &throttled.VaryBy{RemoteAddr: true}, store.NewMemStore(10000))
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middlewareChain := alice.New(proxiedMiddleware, loggingMiddleware, verifyMiddleware, th.Throttle)
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mux := http.NewServeMux()
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mux.Handle("/i2pseeds.su3", middlewareChain.Then(http.HandlerFunc(server.reseedHandler)))
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server.Handler = mux
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return &server
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}
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func (s *Server) indexHandler(w http.ResponseWriter, r *http.Request) {
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fmt.Fprintf(w, "Index")
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}
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func (s *Server) reseedHandler(w http.ResponseWriter, r *http.Request) {
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peer := s.Reseeder.Peer(r)
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seeds, err := s.Reseeder.Seeds(peer)
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if nil != err {
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http.Error(w, "500 Unable to provide seeds", http.StatusInternalServerError)
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return
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}
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su3, err := s.Reseeder.CreateSu3(seeds)
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if nil != err {
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http.Error(w, "500 Unable to generate SU3", http.StatusInternalServerError)
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return
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}
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io.Copy(w, bytes.NewReader(su3.Bytes()))
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}
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func loggingMiddleware(next http.Handler) http.Handler {
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return handlers.CombinedLoggingHandler(os.Stdout, next)
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}
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func verifyMiddleware(next http.Handler) http.Handler {
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fn := func(w http.ResponseWriter, r *http.Request) {
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if I2P_USER_AGENT != r.UserAgent() {
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http.Error(w, "403 Forbidden", http.StatusForbidden)
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return
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}
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next.ServeHTTP(w, r)
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}
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return http.HandlerFunc(fn)
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}
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func proxiedMiddleware(next http.Handler) http.Handler {
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fn := func(w http.ResponseWriter, r *http.Request) {
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if prior, ok := r.Header["X-Forwarded-For"]; ok {
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r.RemoteAddr = prior[0]
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}
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next.ServeHTTP(w, r)
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}
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return http.HandlerFunc(fn)
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}
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