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Simplify Discord interactions endpoint for better compatibility

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cgen-635fdd60ec7c4b3891b5982be658adf5
This commit is contained in:
Builder.io 2025-11-05 20:18:59 +00:00
parent 80cc9a5fe5
commit 43f293c081
1 changed files with 32 additions and 57 deletions
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89
server/index.ts
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@ -10,80 +10,55 @@ const handleDiscordInteractions = (
req: express.Request,
res: express.Response,
) => {
const signature = req.get("x-signature-ed25519");
const timestamp = req.get("x-signature-timestamp");
const rawBody = req.body instanceof Buffer ? req.body : Buffer.from(JSON.stringify(req.body), "utf8");
const bodyString = rawBody.toString("utf8");
const publicKey = process.env.DISCORD_PUBLIC_KEY;
console.log("[Discord] ===== Interaction Request =====");
console.log("[Discord] Signature present:", !!signature);
console.log("[Discord] Timestamp present:", !!timestamp);
console.log("[Discord] Public key configured:", !!publicKey);
console.log("[Discord] Body length:", bodyString.length);
if (!publicKey) {
console.error("[Discord] DISCORD_PUBLIC_KEY not configured");
return res.status(401).json({ error: "Public key not configured" });
}
if (!signature || !timestamp) {
console.error("[Discord] Missing signature or timestamp headers");
return res.status(401).json({ error: "Missing signature or timestamp" });
}
// Verify request signature using Ed25519
try {
const signature = req.get("x-signature-ed25519");
const timestamp = req.get("x-signature-timestamp");
const rawBody = req.body instanceof Buffer ? req.body : Buffer.from(JSON.stringify(req.body), "utf8");
const bodyString = rawBody.toString("utf8");
const publicKey = process.env.DISCORD_PUBLIC_KEY;
console.log("[Discord] Interaction received at", new Date().toISOString());
if (!publicKey) {
console.error("[Discord] DISCORD_PUBLIC_KEY not set");
return res.status(401).json({ error: "Server not configured" });
}
if (!signature || !timestamp) {
console.error("[Discord] Missing headers - signature:", !!signature, "timestamp:", !!timestamp);
return res.status(401).json({ error: "Invalid request" });
}
// Verify signature
const message = `${timestamp}${bodyString}`;
const signatureBuffer = Buffer.from(signature, "hex");
console.log("[Discord] Creating verifier for ed25519...");
const verifier = createVerify("ed25519");
verifier.update(message);
const isValid = verifier.verify(publicKey, signatureBuffer);
console.log("[Discord] Signature valid:", isValid);
if (!isValid) {
console.warn("[Discord] Invalid signature for interaction");
console.error("[Discord] Signature verification failed");
return res.status(401).json({ error: "Invalid signature" });
}
} catch (e: any) {
console.error("[Discord] Signature verification error:", e?.message);
console.error("[Discord] Stack:", e?.stack);
return res.status(401).json({ error: "Signature verification failed: " + e?.message });
}
// Parse the interaction
try {
const interaction = JSON.parse(bodyString);
console.log("[Discord] Valid interaction type:", interaction.type);
// Handle PING interaction (Discord Activity verification)
// Discord sends a PING to verify the endpoint
if (interaction.type === 1) {
console.log("[Discord] ✓ PING received, responding with PONG");
console.log("[Discord] ✓ PING verified");
return res.json({ type: 1 });
}
// Handle other interaction types
if (
interaction.type === 2 ||
interaction.type === 3 ||
interaction.type === 4 ||
interaction.type === 5
) {
console.log("[Discord] Interaction received:", interaction.type);
return res.json({
type: 4,
data: { content: "Activity received your interaction" },
});
}
console.warn("[Discord] Unknown interaction type:", interaction.type);
return res.status(400).json({ error: "Unknown interaction type" });
} catch (e: any) {
console.error("[Discord] Failed to parse interaction:", e?.message);
return res.status(400).json({ error: "Invalid JSON" });
// For all other interactions, acknowledge them
return res.json({
type: 4,
data: { content: "Interaction received" },
});
} catch (err: any) {
console.error("[Discord] Error:", err?.message);
return res.status(500).json({ error: "Server error" });
}
};