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spin.go
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/
spin.go
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package handler
import (
"fmt"
"net/http"
"strconv"
"go.uber.org/zap"
"golang.org/x/crypto/scrypt"
)
type SpinHandler struct {
L *zap.SugaredLogger
}
func (h *SpinHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
speed := r.URL.Query().Get("speed")
if speed == "" {
speed = "15"
}
s, err := strconv.Atoi(speed)
if err != nil || s < 1 {
http.Error(w, "Invalid spin speed", http.StatusBadRequest)
return
}
// We don't care about security
salt := []byte{0x4f, 0xe5, 0x3d, 0xa6, 0x5e, 0x97, 0x5c, 0x50}
// Recommended values. See:
// https://pkg.go.dev/golang.org/x/crypto@v0.8.0/scrypt#Key
dk, err := scrypt.Key([]byte("some password"), salt, 1<<s, 8, 1, 32)
if err != nil {
h.L.Error(err)
http.Error(w, fmt.Sprintf("Spin error: %s", err), http.StatusBadRequest)
}
// Make sure the hashing doesn't get optimized out
h.L.Debug("derived scrypt key:", dk)
w.Write([]byte(fmt.Sprintf("Weeeeeeeeeeeeeeee\n")))
}