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package discordgo
import (
"bytes"
"crypto/ed25519"
"encoding/hex"
"io"
"io/ioutil"
"net/http"
)
// VerifyInteraction implements message verification of the discord interactions api
// signing algorithm, as documented here:
// https://discord.com/developers/docs/interactions/slash-commands#security-and-authorization
func VerifyInteraction(r *http.Request, key ed25519.PublicKey) bool {
var msg bytes.Buffer
signature := r.Header.Get("X-Signature-Ed25519")
if signature == "" {
return false
}
sig, err := hex.DecodeString(signature)
if err != nil {
return false
}
if len(sig) != ed25519.SignatureSize {
return false
}
timestamp := r.Header.Get("X-Signature-Timestamp")
if timestamp == "" {
return false
}
msg.WriteString(timestamp)
defer r.Body.Close()
var body bytes.Buffer
// at the end of the function, copy the original body back into the request
defer func() {
r.Body = ioutil.NopCloser(&body)
}()
// copy body into buffers
_, err = io.Copy(&msg, io.TeeReader(r.Body, &body))
if err != nil {
return false
}
return ed25519.Verify(key, msg.Bytes(), sig)
}
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