thread API start

src/api/routes/channels/#channel_id/messages/#message_id/threads.ts

@@ -0,0 +1,108 @@
+/*
+	Spacebar: A FOSS re-implementation and extension of the Discord.com backend.
+	Copyright (C) 2023 Spacebar and Spacebar Contributors
+
+	This program is free software: you can redistribute it and/or modify
+	it under the terms of the GNU Affero General Public License as published
+	by the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	This program is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU Affero General Public License for more details.
+
+	You should have received a copy of the GNU Affero General Public License
+	along with this program.  If not, see <https://www.gnu.org/licenses/>.
+*/
+
+import { route, sendMessage } from "@spacebar/api";
+import { Message, Channel, emitEvent, User, MessageUpdateEvent } from "@spacebar/util";
+import { MessageThreadCreationSchema, ChannelType, MessageType } from "@spacebar/schemas";
+
+import { Request, Response, Router } from "express";
+
+const router = Router({ mergeParams: true });
+
+// TODO: public read receipts & privacy scoping
+// TODO: send read state event to all channel members
+// TODO: advance-only notification cursor
+
+router.post(
+    "/",
+    route({
+        requestBody: "MessageThreadCreationSchema",
+        responses: {
+            200: {},
+            403: {},
+        },
+    }),
+    async (req: Request, res: Response) => {
+        const { message_id, channel_id } = req.params;
+        const body = req.body as MessageThreadCreationSchema;
+        const message = await Message.findOneOrFail({
+            where: { id: message_id, channel_id },
+            relations: ["guild"],
+        });
+        const channel = await Channel.findOneOrFail({
+            where: { id: channel_id },
+        });
+        const user = await User.findOneOrFail({ where: { id: req.user_id } });
+        const thread = await Channel.createChannel(
+            {
+                id: message.id,
+                owner: user,
+                parent: channel,
+                guild: channel.guild,
+                member_count: 1,
+                message_count: 1,
+                total_message_sent: 1,
+                name: body.name,
+                guild_id: channel.guild_id,
+                rate_limit_per_user: body.rate_limit_per_user,
+                type: ChannelType.GUILD_PUBLIC_THREAD,
+                thread_metadata: {
+                    archived: false,
+                    auto_archive_duration: body.auto_archive_duration || channel.default_auto_archive_duration || 4320,
+                    archive_timestamp: new Date().toISOString(),
+                    locked: false,
+                    create_timestamp: new Date().toISOString(),
+                },
+            },
+            void 0,
+            { skipPermissionCheck: true, keepId: true, skipEventEmit: true },
+        );
+        message.thread = thread;
+        message.flags ||= 1 << 5;
+        await sendMessage({
+            channel_id: thread.id,
+            type: MessageType.THREAD_STARTER_MESSAGE,
+            message_reference: {
+                message_id: message.id,
+                channel_id: channel.id,
+                guild_id: channel.guild_id,
+            },
+            author_id: user.id,
+        });
+        await Promise.all([
+            emitEvent({
+                event: "THREAD_CREATE",
+                channel_id,
+                data: {
+                    ...thread.toJSON(),
+                    newly_created: true,
+                },
+            }),
+            message.save(),
+            emitEvent({
+                event: "MESSAGE_UPDATE",
+                channel_id: message.channel_id,
+                data: message.toJSON(),
+            } as MessageUpdateEvent),
+        ]);
+
+        return res.json(thread.toJSON());
+    },
+);
+
+export default router;

src/api/routes/channels/#channel_id/messages/index.ts

@@ -137,6 +137,7 @@ router.get(
                     sticker_items: true,
                     attachments: true,
                 },
+                thread: true,
             },
         };
 

src/api/util/handlers/Message.ts

@@ -234,7 +234,8 @@ export async function handleMessage(opts: MessageOptions): Promise<Message> {
 
                 if (opts.message_reference.type != 1) {
                     if (opts.message_reference.guild_id !== channel.guild_id) throw new HTTPError("You can only reference messages from this guild");
-                    if (opts.message_reference.channel_id !== opts.channel_id) throw new HTTPError("You can only reference messages from this channel");
+                    if (opts.message_reference.channel_id !== opts.channel_id && opts.type !== MessageType.THREAD_STARTER_MESSAGE)
+                        throw new HTTPError("You can only reference messages from this channel");
                 }
 
                 message.message_reference = opts.message_reference;
@@ -254,14 +255,22 @@ export async function handleMessage(opts: MessageOptions): Promise<Message> {
                     },
                 });
 
-                if (message.referenced_message.channel_id && message.referenced_message.channel_id !== opts.message_reference.channel_id)
+                if (
+                    message.referenced_message.channel_id &&
+                    message.referenced_message.channel_id !== opts.message_reference.channel_id &&
+                    opts.type !== MessageType.THREAD_STARTER_MESSAGE
+                )
                     throw new HTTPError("Referenced message not found in the specified channel", 404);
-                if (message.referenced_message.guild_id && message.referenced_message.guild_id !== opts.message_reference.guild_id)
+                if (
+                    message.referenced_message.guild_id &&
+                    message.referenced_message.guild_id !== opts.message_reference.guild_id &&
+                    opts.type !== MessageType.THREAD_STARTER_MESSAGE
+                )
                     throw new HTTPError("Referenced message not found in the specified channel", 404);
             }
             /** Q: should be checked if the referenced message exists? ANSWER: NO
 			 otherwise backfilling won't work **/
-            message.type = MessageType.REPLY;
+            if (MessageType.THREAD_STARTER_MESSAGE !== message.type) message.type = MessageType.REPLY;
         }
     }
 
@@ -274,7 +283,8 @@ export async function handleMessage(opts: MessageOptions): Promise<Message> {
         !opts.sticker_ids?.length &&
         !opts.poll &&
         !opts.components?.length &&
-        opts.message_reference?.type != 1
+        opts.message_reference?.type != 1 &&
+        opts.type !== MessageType.THREAD_STARTER_MESSAGE
     ) {
         console.log("[Message] Rejecting empty message:", opts, message);
         throw new HTTPError("Empty messages are not allowed", 50006);