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// Package api0 implements the original master server API.
//
// External differences:
// - Proper HTTP response codes are used (this won't break anything since existing code doesn't check them).
// - Caching headers are supported and used where appropriate.
// - Pdiff stuff has been removed (this was never fully implemented to begin with; see docs/PDATA.md).
// - Error messages have been improved. Enum values remain the same for compatibility.
// - Some rate limits (no longer necessary due to increased performance and better caching) have been removed.
// - More HTTP methods and features are supported (e.g., HEAD, OPTIONS, Content-Encoding).
// - Website split into a separate handler (set Handler.NotFound to http.HandlerFunc(web.ServeHTTP) for identical behaviour).
// - /accounts/write_persistence returns a error message for easier debugging.
package api0
import (
"bytes"
"compress/gzip"
"encoding/json"
"net/http"
"strconv"
"strings"
)
// Handler serves requests for the original master server API.
type Handler struct {
// AccountStorage stores accounts. It must be non-nil.
AccountStorage AccountStorage
// PdataStorage stores player data. It must be non-nil.
PdataStorage PdataStorage
// NotFound handles requests not handled by this Handler.
NotFound http.Handler
}
// ServeHTTP routes requests to Handler.
func (h *Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Server", "Atlas")
switch r.URL.Path {
case "/accounts/write_persistence":
h.handleAccountsWritePersistence(w, r)
case "/accounts/get_username":
h.handleAccountsGetUsername(w, r)
case "/accounts/lookup_uid":
h.handleAccountsLookupUID(w, r)
default:
if strings.HasPrefix(r.URL.Path, "/player/") {
// TODO: rate limit
h.handlePlayer(w, r)
return
}
if h.NotFound == nil {
http.Error(w, http.StatusText(http.StatusNotFound), http.StatusNotFound)
} else {
h.NotFound.ServeHTTP(w, r)
}
}
}
// respJSON writes the JSON encoding of obj with the provided response status.
func respJSON(w http.ResponseWriter, r *http.Request, status int, obj any) {
if r.Method == http.MethodHead {
w.WriteHeader(status)
return
}
buf, err := json.Marshal(obj)
if err != nil {
panic(err)
}
w.Header().Set("Content-Type", "application/json; charset=utf-8")
w.Header().Set("Content-Length", strconv.Itoa(len(buf)))
w.WriteHeader(status)
w.Write(buf)
}
// respMaybeCompress writes buf with the provided response status, compressing
// it with gzip if the client supports it and the result is smaller.
func respMaybeCompress(w http.ResponseWriter, r *http.Request, status int, buf []byte) {
for _, e := range strings.Split(r.Header.Get("Accept-Encoding"), ",") {
if t, _, _ := strings.Cut(e, ";"); strings.TrimSpace(t) == "gzip" {
var cbuf bytes.Buffer
gw := gzip.NewWriter(&cbuf)
if _, err := gw.Write(buf); err != nil {
break
}
if err := gw.Close(); err != nil {
break
}
if cbuf.Len() < int(float64(len(buf))*0.8) {
buf = cbuf.Bytes()
w.Header().Set("Content-Encoding", "gzip")
}
break
}
}
w.Header().Set("Content-Length", strconv.Itoa(len(buf)))
w.WriteHeader(status)
if r.Method != http.MethodHead {
w.Write(buf)
}
}
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