Updated PreviewCard, FetchLinkCardService, FetchOEmbedService

• Updated:
- PreviewCard, FetchLinkCardService, FetchOEmbedService to work better

app/models/preview_card.rb

@@ -26,7 +26,7 @@
 
 class PreviewCard < ApplicationRecord
   IMAGE_MIME_TYPES = ['image/jpeg', 'image/png', 'image/gif', 'image/webp'].freeze
-  LIMIT = 1.megabytes
+  LIMIT = 4.megabytes
 
   self.inheritance_column = false
 
@@ -45,6 +45,10 @@ class PreviewCard < ApplicationRecord
 
   before_save :extract_dimensions, if: :link?
 
+  def missing_image?
+    width.present? && height.present? && image_file_name.blank?
+  end
+  
   def save_with_optional_image!
     save!
   rescue ActiveRecord::RecordInvalid

app/services/fetch_link_card_service.rb

@@ -30,7 +30,7 @@ class FetchLinkCardService < BaseService
     RedisLock.acquire(lock_options) do |lock|
       if lock.acquired?
         @card = PreviewCard.find_by(url: @url)
-        process_url if @card.nil? || @card.updated_at <= 2.weeks.ago
+        process_url if @card.nil? || @card.updated_at <= 1.weeks.ago || @card.missing_image?
       else
         raise GabSocial::RaceConditionError
       end
@@ -47,7 +47,7 @@ class FetchLinkCardService < BaseService
   def process_url
     @card ||= PreviewCard.new(url: @url)
 
-    Request.new(:get, @url).perform do |res|
+    Request.new(:get, @url).add_headers('Accept' => 'text/html').perform do |res|
       if res.code == 200 && res.mime_type == 'text/html'
         @html = res.body_with_limit
         @html_charset = res.charset

app/services/fetch_oembed_service.rb

@@ -64,7 +64,7 @@ class FetchOEmbedService
   def html
     return @html if defined?(@html)
 
-    @html = @options[:html] || Request.new(:get, @url).perform do |res|
+    @html = @options[:html] || Request.new(:get, @url).add_headers('Accept' => 'text/html').perform do |res|
       res.code != 200 || res.mime_type != 'text/html' ? nil : res.body_with_limit
     end
   end