FIX: Consider oneboxes links wrt to `min_trust_level_to_post_links`

app/models/post.rb

@@ -222,7 +222,13 @@ class Post < ActiveRecord::Base
     @post_analyzers[raw_hash] ||= PostAnalyzer.new(raw, topic_id)
   end
 
-  %w{raw_mentions linked_hosts image_count attachment_count link_count raw_links}.each do |attr|
+  %w{raw_mentions
+    linked_hosts
+    image_count
+    attachment_count
+    link_count
+    raw_links
+    has_oneboxes?}.each do |attr|
     define_method(attr) do
       post_analyzer.send(attr)
     end

app/models/post_analyzer.rb

@@ -13,6 +13,13 @@ class PostAnalyzer
     @found_oneboxes
   end
 
+  def has_oneboxes?
+    return false unless @raw.present?
+
+    cooked_stripped
+    found_oneboxes?
+  end
+
   # What we use to cook posts
   def cook(raw, opts = {})
     cook_method = opts[:cook_method]
@@ -104,7 +111,6 @@ class PostAnalyzer
     return @raw_links if @raw_links.present?
 
     @raw_links = []
-
     cooked_stripped.css("a[href]").each do |l|
       # Don't include @mentions in the link count
       next if l['href'].blank? || link_is_a_mention?(l)

lib/validators/post_validator.rb

@@ -93,7 +93,7 @@ class Validators::PostValidator < ActiveModel::Validator
   end
 
   def can_post_links_validator(post)
-    return if post.link_count == 0 ||
+    return if (post.link_count == 0 && !post.has_oneboxes?) ||
       Guardian.new(post.acting_user).can_post_link? ||
       private_message?(post)
 

spec/models/post_spec.rb

@@ -355,6 +355,7 @@ describe Post do
   describe "maximums" do
     let(:newuser) { Fabricate(:user, trust_level: TrustLevel[0]) }
     let(:post_one_link) { post_with_body("[sherlock](http://www.bbc.co.uk/programmes/b018ttws)", newuser) }
+    let(:post_onebox) { post_with_body("http://www.google.com", newuser) }
     let(:post_two_links) { post_with_body("<a href='http://discourse.org'>discourse</a> <a href='http://twitter.com'>twitter</a>", newuser) }
     let(:post_with_mentions) { post_with_body("hello @#{newuser.username} how are you doing?", newuser) }
 
@@ -396,10 +397,18 @@ describe Post do
         expect(post_two_links).to be_valid
       end
 
-      it "doesn't allow allow links if `min_trust_to_post_links` is not met" do
-        SiteSetting.min_trust_to_post_links = 2
-        post_two_links.user.trust_level = TrustLevel[1]
-        expect(post_one_link).not_to be_valid
+      context "min_trust_to_post_links" do
+        it "considers oneboxes links" do
+          SiteSetting.min_trust_to_post_links = 3
+          post_onebox.user.trust_level = TrustLevel[2]
+          expect(post_onebox).not_to be_valid
+        end
+
+        it "doesn't allow allow links if `min_trust_to_post_links` is not met" do
+          SiteSetting.min_trust_to_post_links = 2
+          post_two_links.user.trust_level = TrustLevel[1]
+          expect(post_one_link).not_to be_valid
+        end
       end
 
     end