From 16e74650e8dcdbeb2da63710cc13974626c07dee Mon Sep 17 00:00:00 2001
From: evazion <noizave@gmail.com>
Date: Sun, 16 Oct 2022 17:16:28 -0500
Subject: [PATCH] media assets: include file URLs in /media_assets.json API.

Include information about the asset's variants (sample images) in the /media_assets.json API:

    {
      "id": 6410907,
      "created_at": "2022-07-31T15:44:34.522-04:00",
      "updated_at": "2022-07-31T15:44:38.002-04:00",
      "md5": "19a2be6a1a8582bb349de9734b7a649a",
      "file_ext": "jpg",
      "file_size": 369029,
      "image_width": 600,
      "image_height": 900,
      "duration": null,
      "status": "active",
      "file_key": "R4DBCxBID",
      "is_public": true,
      "variants": [
         {
           "variant": "preview",
           "url": "https://cdn.donmai.us/preview/19/a2/19a2be6a1a8582bb349de9734b7a649a.jpg",
           "width": 100,
           "height": 150,
           "file_ext": "jpg"
         },
         {
           "variant": "180x180",
           "url": "https://cdn.donmai.us/180x180/19/a2/19a2be6a1a8582bb349de9734b7a649a.jpg",
           "width": 120,
           "height": 180,
           "file_ext": "jpg"
         },
         {
           "variant": "360x360",
           "url": "https://cdn.donmai.us/360x360/19/a2/19a2be6a1a8582bb349de9734b7a649a.jpg",
           "width": 240,
           "height": 360,
           "file_ext": "jpg"
         },
         {
           "variant": "720x720",
           "url": "https://cdn.donmai.us/720x720/19/a2/19a2be6a1a8582bb349de9734b7a649a.webp",
           "width": 480,
           "height": 720,
           "file_ext": "webp"
         },
         {
           "variant": "original",
           "url": "https://cdn.donmai.us/original/19/a2/19a2be6a1a8582bb349de9734b7a649a.jpg",
           "width": 600,
           "height": 900,
           "file_ext": "jpg"
         }
      ]
    }
---
 app/models/media_asset.rb          | 6 ++++++
 app/policies/media_asset_policy.rb | 8 +++-----
 2 files changed, 9 insertions(+), 5 deletions(-)

diff --git a/app/models/media_asset.rb b/app/models/media_asset.rb
index 0ce712053..fb093632a 100644
--- a/app/models/media_asset.rb
+++ b/app/models/media_asset.rb
@@ -51,6 +51,8 @@ class MediaAsset < ApplicationRecord
 
   class Variant
     extend Memoist
+    include ActiveModel::Serializers::JSON
+    include ActiveModel::Serializers::Xml
 
     attr_reader :media_asset, :variant
     delegate :md5, :storage_service, :backup_storage_service, to: :media_asset
@@ -164,6 +166,10 @@ class MediaAsset < ApplicationRecord
       dimensions[1]
     end
 
+    def serializable_hash(*options)
+      { variant: variant, url: file_url, width: width, height: height, file_ext: file_ext }
+    end
+
     memoize :file_name, :file_ext, :max_dimensions, :dimensions
   end
 
diff --git a/app/policies/media_asset_policy.rb b/app/policies/media_asset_policy.rb
index 9d6f45887..05e57eefd 100644
--- a/app/policies/media_asset_policy.rb
+++ b/app/policies/media_asset_policy.rb
@@ -10,10 +10,8 @@ class MediaAssetPolicy < ApplicationPolicy
   end
 
   def api_attributes
-    if can_see_image?
-      super
-    else
-      super.excluding(:md5, :file_key)
-    end
+    attributes = super + [:variants]
+    attributes -= [:md5, :file_key, :variants] if !can_see_image?
+    attributes
   end
 end