Add basic OEmbed provider API, fix #247

app/views/api/oembed/show.json.rabl

@@ -0,0 +1,14 @@
+# frozen_string_literal: true
+object @stream_entry
+
+node(:type) { 'rich' }
+node(:version) { '1.0' }
+node(:title, &:title)
+node(:author_name) { |entry| entry.account.display_name.blank? ? entry.account.username : entry.account.display_name }
+node(:author_url) { |entry| account_url(entry.account) }
+node(:provider_name) { Rails.configuration.x.local_domain }
+node(:provider_url) { root_url }
+node(:cache_age) { 86_400 }
+node(:html, &:content)
+node(:width) { @width }
+node(:height) { @height }