From 9da5075b3047bca255b32db1ac1b7356d1616b2f Mon Sep 17 00:00:00 2001
From: "Kalle (Sendou)" <38327916+Sendouc@users.noreply.github.com>
Date: Tue, 22 Dec 2020 18:41:40 +0200
Subject: [PATCH] discord bot ping pong test

---
 discord/index.ts     | 52 ++++++++++++++++++++++++++++++++++++++++
 package-lock.json    |  8 +++++++
 package.json         |  1 +
 pages/api/discord.ts | 56 +++++++++++---------------------------------
 4 files changed, 75 insertions(+), 42 deletions(-)
 create mode 100644 discord/index.ts

diff --git a/discord/index.ts b/discord/index.ts
new file mode 100644
index 000000000..c21bf8848
--- /dev/null
+++ b/discord/index.ts
@@ -0,0 +1,52 @@
+import {
+  InteractionResponseFlags,
+  InteractionResponseType,
+} from "discord-interactions";
+
+type InvocationCommon = {
+  member: {
+    user: {
+      id: number;
+      username: string;
+      avatar: string;
+      discriminator: string;
+      public_flags: number;
+    };
+    roles: string[];
+  };
+};
+
+interface Interaction extends InvocationCommon {
+  data: { name: "ping" };
+}
+
+type ReturnData = {
+  type: InteractionResponseType;
+  data: {
+    content: string;
+  };
+  flags?: InteractionResponseFlags;
+};
+
+const handleCommand = (interaction: Interaction): ReturnData => {
+  switch (interaction.data.name) {
+    case "ping":
+      return {
+        type: InteractionResponseType.CHANNEL_MESSAGE,
+        data: {
+          content: "pong",
+        },
+      };
+    default:
+      console.error("not existing command invoced");
+      return {
+        type: InteractionResponseType.CHANNEL_MESSAGE,
+        data: {
+          content: "Sorry but I don't understand this command 😞",
+        },
+        flags: InteractionResponseFlags.EPHEMERAL,
+      };
+  }
+};
+
+export default handleCommand;
diff --git a/package-lock.json b/package-lock.json
index 2a76e5fd1..3ee70c90f 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -4429,6 +4429,14 @@
         }
       }
     },
+    "discord-interactions": {
+      "version": "1.4.1",
+      "resolved": "https://registry.npmjs.org/discord-interactions/-/discord-interactions-1.4.1.tgz",
+      "integrity": "sha512-JLB+uAWEluymJWlJkQ9GJui2cYdTMM3pGOEN5j3p2S/+7xdRjjGtqGgRGAqA5tyPVUHHchtsV/EAooVgM0cVBg==",
+      "requires": {
+        "tweetnacl": "^1.0.3"
+      }
+    },
     "dom-helpers": {
       "version": "3.4.0",
       "resolved": "https://registry.npmjs.org/dom-helpers/-/dom-helpers-3.4.0.tgz",
diff --git a/package.json b/package.json
index 6b7e0b6e1..c241a2265 100644
--- a/package.json
+++ b/package.json
@@ -32,6 +32,7 @@
     "@prisma/client": "^2.13.1",
     "@sendou/react-sketch": "^0.5.2",
     "countries-list": "^2.5.6",
+    "discord-interactions": "^1.4.1",
     "framer-motion": "^3.1.1",
     "next": "^10.0.3",
     "next-auth": "^3.1.0",
diff --git a/pages/api/discord.ts b/pages/api/discord.ts
index c8cee476a..02aeb928c 100644
--- a/pages/api/discord.ts
+++ b/pages/api/discord.ts
@@ -1,43 +1,9 @@
+import handleCommand from "discord";
+import { InteractionType } from "discord-interactions";
 import { NextApiRequest, NextApiResponse } from "next";
 import getRawBody from "raw-body";
 import nacl from "tweetnacl";
 
-/*
-{
-    "type": 2,
-    "token": "A_UNIQUE_TOKEN",
-    "member": { 
-        "user": {
-            "id": 53908232506183680,
-            "username": "Mason",
-            "avatar": "a_d5efa99b3eeaa7dd43acca82f5692432",
-            "discriminator": "1337",
-            "public_flags": 131141
-        },
-        "roles": ["539082325061836999"],
-        "premium_since": null,
-        "permissions": "2147483647",
-        "pending": false,
-        "nick": null,
-        "mute": false,
-        "joined_at": "2017-03-13T19:19:14.040000+00:00",
-        "is_pending": false,
-        "deaf": false 
-    },
-    "id": "786008729715212338",
-    "guild_id": "290926798626357999",
-    "data": { 
-        "options": [{
-            "name": "cardname",
-            "value": "The Gitrog Monster"
-        }],
-        "name": "cardsearch",
-        "id": "771825006014889984" 
-    },
-    "channel_id": "645027906669510667" 
-}
- */
-
 const discordCommandHandler = async (
   req: NextApiRequest,
   res: NextApiResponse
@@ -47,13 +13,13 @@ const discordCommandHandler = async (
 
   const signature = req.headers["x-signature-ed25519"] as string;
   const timestamp = req.headers["x-signature-timestamp"] as string;
-  const body = (await getRawBody(req)).toString(); // rawBody is expected to be a string, not raw bytes
+  const rawBody = (await getRawBody(req)).toString(); // rawBody is expected to be a string, not raw bytes
 
   let isVerified;
 
   try {
     isVerified = nacl.sign.detached.verify(
-      Buffer.from(timestamp + body),
+      Buffer.from(timestamp + rawBody),
       Buffer.from(signature, "hex"),
       Buffer.from(PUBLIC_KEY, "hex")
     );
@@ -65,10 +31,16 @@ const discordCommandHandler = async (
     return res.status(401).end("invalid request signature");
   }
 
-  // if req.json type === 1
-  res.status(200).json({
-    type: 1,
-  });
+  const interaction = JSON.parse(rawBody);
+
+  if (interaction && interaction.type === InteractionType.COMMAND) {
+    const result = handleCommand(interaction);
+    res.status(200).json(result);
+  } else {
+    res.status(200).json({
+      type: 1,
+    });
+  }
 };
 
 export default discordCommandHandler;