FIX: include title in local onebox when linking to a different topic

app/assets/javascripts/discourse/components/composer-editor.js.es6

@@ -372,7 +372,13 @@ export default Ember.Component.extend({
       post.set('refreshedPost', true);
     }
 
-    $oneboxes.each((_, o) => load({ elem: o, refresh, ajax, categoryId: this.get('composer.category.id') }));
+    $oneboxes.each((_, o) => load({
+      elem: o,
+      refresh,
+      ajax,
+      categoryId: this.get('composer.category.id'),
+      topicId: this.get('composer.topic.id')
+    }));
   },
 
   _warnMentionedGroups($preview) {

app/assets/javascripts/discourse/components/composer-title.js.es6

@@ -86,6 +86,7 @@ export default Ember.Component.extend({
         ajax,
         synchronous: true,
         categoryId: this.get('composer.category.id'),
+        topicId: this.get('composer.topic.id')
       });
 
       if (loadOnebox && loadOnebox.then) {

app/assets/javascripts/pretty-text/oneboxer.js.es6

@@ -43,12 +43,17 @@ function loadNext(ajax) {
 
   let timeoutMs = 150;
   let removeLoading = true;
-  const { url, refresh, $elem, categoryId } = loadingQueue.shift();
+  const { url, refresh, $elem, categoryId, topicId } = loadingQueue.shift();
 
   // Retrieve the onebox
   return ajax("/onebox", {
     dataType: 'html',
-    data: { url, refresh, category_id: categoryId },
+    data: {
+      url,
+      refresh,
+      category_id: categoryId,
+      topic_id: topicId
+    },
     cache: true
   }).then(html => {
     let $html = $(html);
@@ -59,7 +64,7 @@ function loadNext(ajax) {
     if (result && result.jqXHR && result.jqXHR.status === 429) {
       timeoutMs = 2000;
       removeLoading = false;
-      loadingQueue.unshift({ url, refresh, $elem, categoryId });
+      loadingQueue.unshift({ url, refresh, $elem, categoryId, topicId });
     } else {
       failedCache[normalize(url)] = true;
     }
@@ -74,7 +79,7 @@ function loadNext(ajax) {
 
 // Perform a lookup of a onebox based an anchor $element.
 // It will insert a loading indicator and remove it when the loading is complete or fails.
-export function load({ elem , refresh = true, ajax, synchronous = false, categoryId }) {
+export function load({ elem , refresh = true, ajax, synchronous = false, categoryId, topicId }) {
   const $elem = $(elem);
 
   // If the onebox has loaded or is loading, return
@@ -98,7 +103,7 @@ export function load({ elem , refresh = true, ajax, synchronous = false, categor
   $elem.addClass('loading-onebox');
 
   // Add to the loading queue
-  loadingQueue.push({ url, refresh, $elem, categoryId });
+  loadingQueue.push({ url, refresh, $elem, categoryId, topicId });
 
   // Load next url in queue
   if (synchronous) {

app/controllers/onebox_controller.rb

@@ -15,6 +15,7 @@ class OneboxController < ApplicationController
 
     user_id = current_user.id
     category_id = params[:category_id].to_i
+    topic_id = params[:topic_id].to_i
     invalidate = params[:refresh] == 'true'
     url = params[:url]
 
@@ -24,7 +25,8 @@ class OneboxController < ApplicationController
       preview = Oneboxer.preview(url,
         invalidate_oneboxes: invalidate,
         user_id: user_id,
-        category_id: category_id
+        category_id: category_id,
+        topic_id: topic_id
       )
 
       preview.strip! if preview.present?

lib/oneboxer.rb

@@ -170,6 +170,10 @@ module Oneboxer
         return unless Guardian.new(current_user).can_see_category?(current_category)
       end
 
+      if current_topic = Topic.find_by(id: opts[:topic_id])
+        return unless Guardian.new(current_user).can_see_topic?(current_topic)
+      end
+
       topic = Topic.find_by(id: route[:topic_id])
 
       return unless topic
@@ -187,7 +191,7 @@ module Oneboxer
 
       return if !post || post.hidden || post.post_type != Post.types[:regular]
 
-      if post_number > 1
+      if post_number > 1 && current_topic&.id == topic.id
         excerpt = post.excerpt(SiteSetting.post_onebox_maxlength)
         excerpt.gsub!(/[\r\n]+/, " ")
         excerpt.gsub!("[/quote]", "[quote]") # don't break my quote

spec/components/oneboxer_spec.rb

@@ -18,8 +18,11 @@ describe Oneboxer do
       %{<a href="#{url}">#{url}</a>}
     end
 
-    def preview(url, user, category = Category.first)
-      Oneboxer.preview("#{Discourse.base_url}#{url}", user_id: user.id, category_id: category.id).to_s
+    def preview(url, user = nil, category = nil, topic = nil)
+      Oneboxer.preview("#{Discourse.base_url}#{url}",
+        user_id: user&.id,
+        category_id: category&.id,
+        topic_id: topic&.id).to_s
     end
 
     it "links to a topic/post" do
@@ -44,7 +47,8 @@ describe Oneboxer do
 
       expect(preview(public_topic.relative_url, user, public_category)).to include(public_topic.title)
       expect(preview(public_post.url, user, public_category)).to include(public_topic.title)
-      expect(preview(public_reply.url, user, public_category)).to include(public_reply.cooked)
+      expect(preview(public_reply.url, user, public_category)).to include(public_reply.excerpt)
+      expect(preview(public_reply.url, user, public_category, public_topic)).not_to include(public_topic.title)
       expect(preview(public_hidden.url, user, public_category)).to match_html(link(public_hidden.url))
       expect(preview(secured_topic.relative_url, user, public_category)).to match_html(link(secured_topic.relative_url))
       expect(preview(secured_post.url, user, public_category)).to match_html(link(secured_post.url))
@@ -57,27 +61,27 @@ describe Oneboxer do
 
       expect(preview(public_topic.relative_url, staff, secured_category)).to include(public_topic.title)
       expect(preview(public_post.url, staff, secured_category)).to include(public_topic.title)
-      expect(preview(public_reply.url, staff, secured_category)).to include(public_reply.cooked)
+      expect(preview(public_reply.url, staff, secured_category)).to include(public_reply.excerpt)
       expect(preview(public_hidden.url, staff, secured_category)).to match_html(link(public_hidden.url))
       expect(preview(secured_topic.relative_url, staff, secured_category)).to include(secured_topic.title)
       expect(preview(secured_post.url, staff, secured_category)).to include(secured_topic.title)
-      expect(preview(secured_reply.url, staff, secured_category)).to include(secured_reply.cooked)
+      expect(preview(secured_reply.url, staff, secured_category)).to include(secured_reply.excerpt)
+      expect(preview(secured_reply.url, staff, secured_category, secured_topic)).not_to include(secured_topic.title)
     end
 
     it "links to an user profile" do
       user = Fabricate(:user)
 
-      expect(preview("/u/does-not-exist", user)).to match_html(link("/u/does-not-exist"))
-      expect(preview("/u/#{user.username}", user)).to include(user.name)
+      expect(preview("/u/does-not-exist")).to match_html(link("/u/does-not-exist"))
+      expect(preview("/u/#{user.username}")).to include(user.name)
     end
 
     it "links to an upload" do
-      user = Fabricate(:user)
       path = "/uploads/default/original/3X/e/8/e8fcfa624e4fb6623eea57f54941a58ba797f14d"
 
-      expect(preview("#{path}.pdf", user)).to match_html(link("#{path}.pdf"))
-      expect(preview("#{path}.MP3", user)).to include("<audio ")
-      expect(preview("#{path}.mov", user)).to include("<video ")
+      expect(preview("#{path}.pdf")).to match_html(link("#{path}.pdf"))
+      expect(preview("#{path}.MP3")).to include("<audio ")
+      expect(preview("#{path}.mov")).to include("<video ")
     end
 
   end