FIX: Support for skipping redirects on certain domains (like steam)

lib/final_destination.rb

@@ -20,6 +20,7 @@ class FinalDestination
         nil
       end
     end
+    @ignored = [Discourse.base_url_no_prefix] + (@opts[:ignore_redirects] || [])
     @limit = @opts[:max_redirects]
     @status = :ready
     @cookie = nil
@@ -63,11 +64,12 @@ class FinalDestination
       return nil
     end
 
-    # Always allow current base url
-    if hostname_matches?(Discourse.base_url_no_prefix)
+    @ignored.each do |host|
+      if hostname_matches?(host)
         @status = :resolved
         return @uri
       end
+    end
 
     return nil unless validate_uri
     headers = request_headers

lib/oneboxer.rb

@@ -17,6 +17,10 @@ module Oneboxer
     end
   end
 
+  def self.ignore_redirects
+    @ignore_redirects ||= ['http://store.steampowered.com']
+  end
+
   def self.preview(url, options=nil)
     options ||= {}
     invalidate(url) if options[:invalidate_oneboxes]
@@ -144,7 +148,7 @@ module Oneboxer
     def self.onebox_raw(url)
 
       Rails.cache.fetch(onebox_cache_key(url), expires_in: 1.day) do
-        fd = FinalDestination.new(url)
+        fd = FinalDestination.new(url, ignore_redirects: ignore_redirects)
         uri = fd.resolve
         return blank_onebox if uri.blank? || SiteSetting.onebox_domains_blacklist.include?(uri.hostname)
         options = {

spec/components/final_destination_spec.rb

@@ -4,7 +4,10 @@ require 'final_destination'
 describe FinalDestination do
 
   let(:opts) do
-    { # avoid IP lookups in test
+    {
+      ignore_redirects: ['https://ignore-me.com'],
+
+      # avoid IP lookups in test
       lookup_ip: lambda do |host|
         case host
         when 'eviltrout.com' then '52.84.143.152'
@@ -13,6 +16,7 @@ describe FinalDestination do
         when 'some_thing.example.com' then '104.25.152.10'
         when 'private-host.com' then '192.168.10.1'
         when 'internal-ipv6.com' then '2001:abc:de:01:3:3d0:6a65:c2bf'
+        when 'ignore-me.com' then '53.84.143.152'
         else
           as_ip = IPAddr.new(host) rescue nil
           raise "couldn't lookup #{host}" if as_ip.nil?
@@ -64,6 +68,13 @@ describe FinalDestination do
       end
     end
 
+    it "ignores redirects" do
+      final = FinalDestination.new('https://ignore-me.com/some-url', opts)
+      expect(final.resolve.to_s).to eq('https://ignore-me.com/some-url')
+      expect(final.redirected?).to eq(false)
+      expect(final.status).to eq(:resolved)
+    end
+
     context "underscores in URLs" do
       before do
         stub_request(:head, 'https://some_thing.example.com').to_return(doc_response)