refactor

app/logical/downloads/rewrite_strategies/tumblr.rb

@@ -0,0 +1,37 @@
+module Downloads
+  module RewriteStrategies
+    class Tumblr < Base
+      def rewrite(url, headers)
+        if url =~ %r{^https?://.*tumblr\.com}
+          url, headers = rewrite_cdn(url, headers)
+          url, headers = rewrite_thumbnails(url, headers)
+        end
+
+        return [url, headers]
+      end
+
+    protected
+      def rewrite_thumbnails(url, headers)
+        if url =~ %r{^http?://.+\.tumblr\.com/(?:\w+/)?(?:tumblr_)?(\w+_)(250|400|500)\..+$}
+          match = $1
+          given_size = $2
+
+          big_1280_url = url.sub(match + given_size, match + "1280")
+          if http_exists?(big_1280_url, headers)
+            return [big_1280_url, headers]
+          end
+        end
+
+        return [url, headers]
+      end
+
+      def rewrite_cdn(url, headers)
+        if url =~ %r{https?://gs1\.wac\.edgecastcdn\.net/8019B6/data\.tumblr\.com/}
+          url.sub!("gs1.wac.edgecastcdn.net/8019B6/", "")
+        end
+
+        return [url, headers]
+      end
+    end
+  end
+end