Add media dimensions (#2448)

* Fixes #1985

- add migration AddMediaAttachmentMeta, which add meta field to media_attachments
- before saving attachment, set file meta if needed
- add meta in api

* add spec

* align the “size” format for image and video

* fix code climate

* fixes media_attachment_spec.rb

spec/models/media_attachment_spec.rb

@@ -11,6 +11,13 @@ RSpec.describe MediaAttachment, type: :model do
     it 'converts original file to mp4' do
       expect(media.file_content_type).to eq 'video/mp4'
     end
+
+    it 'sets meta' do
+      expect(media.file.meta["original"]["width"]).to eq 128
+      expect(media.file.meta["original"]["height"]).to eq 128
+      expect(media.file.meta["original"]["aspect"]).to eq 1.0
+    end
+
   end
 
   describe 'non-animated gif non-conversion' do
@@ -23,5 +30,24 @@ RSpec.describe MediaAttachment, type: :model do
     it 'leaves original file as-is' do
       expect(media.file_content_type).to eq 'image/gif'
     end
+
+    it 'sets meta' do
+      expect(media.file.meta["original"]["width"]).to eq 600
+      expect(media.file.meta["original"]["height"]).to eq 400
+      expect(media.file.meta["original"]["aspect"]).to eq 1.5
+    end
+  end
+
+  describe 'jpeg' do
+    let(:media) { MediaAttachment.create(account: Fabricate(:account), file: attachment_fixture('attachment.jpg')) }
+
+    it 'sets meta for different style' do
+      expect(media.file.meta["original"]["width"]).to eq 600
+      expect(media.file.meta["original"]["height"]).to eq 400
+      expect(media.file.meta["original"]["aspect"]).to eq 1.5
+      expect(media.file.meta["small"]["width"]).to eq 400
+      expect(media.file.meta["small"]["height"]).to eq 267
+      expect(media.file.meta["small"]["aspect"]).to eq 400.0/267
+    end
   end
 end