DEV: allows a context when creating a message (#25647)

The service `Chat::CreateMessage` will now accept `context_post_ids` and `context_topic_id` as params. These values represent the topic which might be visible when sending a message (for now, this is only possible when using the drawer).

The `DiscourseEvent` `chat_message_created` will now have the following signature:

```ruby
on(:chat_message_created) do | message, channel, user, meta|
  p meta[:context][:post_ids]
end
```

plugins/chat/assets/javascripts/discourse/components/chat-channel.gjs

@@ -35,6 +35,7 @@ import {
   checkMessageTopVisibility,
 } from "discourse/plugins/chat/discourse/lib/check-message-visibility";
 import DatesSeparatorsPositioner from "discourse/plugins/chat/discourse/lib/dates-separators-positioner";
+import { extractCurrentTopicInfo } from "discourse/plugins/chat/discourse/lib/extract-current-topic-info";
 import {
   scrollListToBottom,
   scrollListToMessage,
@@ -560,12 +561,17 @@ export default class ChatChannel extends Component {
     }
 
     try {
-      await this.chatApi.sendMessage(this.args.channel.id, {
+      const params = {
         message: message.message,
         in_reply_to_id: message.inReplyTo?.id,
         staged_id: message.id,
         upload_ids: message.uploads.map((upload) => upload.id),
-      });
+      };
+
+      await this.chatApi.sendMessage(
+        this.args.channel.id,
+        Object.assign({}, params, extractCurrentTopicInfo(this))
+      );
 
       if (!this.capabilities.isIOS) {
         this.scrollToLatestMessage();

plugins/chat/assets/javascripts/discourse/components/chat-thread.gjs

@@ -25,6 +25,7 @@ import {
 } from "discourse/plugins/chat/discourse/lib/chat-ios-hacks";
 import ChatMessagesLoader from "discourse/plugins/chat/discourse/lib/chat-messages-loader";
 import DatesSeparatorsPositioner from "discourse/plugins/chat/discourse/lib/dates-separators-positioner";
+import { extractCurrentTopicInfo } from "discourse/plugins/chat/discourse/lib/extract-current-topic-info";
 import {
   scrollListToBottom,
   scrollListToMessage,
@@ -429,15 +430,17 @@ export default class ChatThread extends Component {
     }
 
     try {
+      const params = {
+        message: message.message,
+        in_reply_to_id: null,
+        staged_id: message.id,
+        upload_ids: message.uploads.map((upload) => upload.id),
+        thread_id: message.thread.id,
+      };
+
       const response = await this.chatApi.sendMessage(
         this.args.thread.channel.id,
-        {
-          message: message.message,
-          in_reply_to_id: null,
-          staged_id: message.id,
-          upload_ids: message.uploads.map((upload) => upload.id),
-          thread_id: message.thread.id,
-        }
+        Object.assign({}, params, extractCurrentTopicInfo(this))
       );
 
       this.args.thread.currentUserMembership ??=

plugins/chat/assets/javascripts/discourse/lib/extract-current-topic-info.js

@@ -0,0 +1,29 @@
+import { getOwner } from "@ember/application";
+
+export function extractCurrentTopicInfo(context) {
+  const topic = getOwner(context).lookup("controller:topic")?.get("model");
+
+  if (!topic) {
+    return;
+  }
+
+  const info = { topic_id: topic.id };
+  const currentPostNumber = parseInt(topic.current_post_number, 10);
+  const posts = topic.postStream.posts;
+
+  const currentPost = posts.find(
+    (post) => post.post_number === currentPostNumber
+  );
+  const previousPost = posts.findLast(
+    (post) =>
+      !post.hidden && !post.deleted_at && post.post_number < currentPostNumber
+  );
+  const nextPost = posts.find(
+    (post) =>
+      !post.hidden && !post.deleted_at && post.post_number > currentPostNumber
+  );
+
+  info.post_ids = [previousPost?.id, currentPost?.id, nextPost?.id];
+
+  return info;
+}

plugins/chat/assets/javascripts/discourse/pre-initializers/chat-plugin-api.js

@@ -163,6 +163,8 @@ export default {
               .lookup("service:chat-api")
               .sendMessage(channelId, {
                 thread_id: options.threadId,
+                post_ids: options.postIds,
+                topic_id: options.topicId,
                 message: options.message,
                 uploads: options.uploads,
               });

plugins/chat/assets/javascripts/discourse/services/chat-api.js

@@ -180,6 +180,8 @@ export default class ChatApi extends Service {
    * @param {number} [data.in_reply_to_id] - The ID of the replied-to message.
    * @param {number} [data.staged_id] - The staged ID of the message before it was persisted.
    * @param {number} [data.thread_id] - The ID of the thread where this message should be posted.
+   * @param {number} [data.topic_id] - The ID of the currently visible topic in drawer mode.
+   * @param {number} [data.post_ids] - The ID of the currently visible posts in drawer mode.
    * @param {Array.<number>} [data.upload_ids] - Array of upload ids linked to the message.
    * @returns {Promise}
    */