Add API to delete media attachments that are not in use

app/controllers/api/v1/media_controller.rb

@@ -3,8 +3,8 @@
 class Api::V1::MediaController < Api::BaseController
   before_action -> { doorkeeper_authorize! :write, :'write:media' }
   before_action :require_user!
-  before_action :set_media_attachment, except: [:create]
-  before_action :check_processing, except: [:create]
+  before_action :set_media_attachment, except: [:create, :destroy]
+  before_action :check_processing, except: [:create, :destroy]
 
   def show
     render json: @media_attachment, serializer: REST::MediaAttachmentSerializer, status: status_code_for_media_attachment
@@ -25,6 +25,15 @@ class Api::V1::MediaController < Api::BaseController
     render json: @media_attachment, serializer: REST::MediaAttachmentSerializer, status: status_code_for_media_attachment
   end
 
+  def destroy
+    @media_attachment = current_account.media_attachments.find(params[:id])
+
+    return render json: in_usage_error, status: 422 unless @media_attachment.status_id.nil?
+
+    @media_attachment.destroy
+    render_empty
+  end
+
   private
 
   def status_code_for_media_attachment
@@ -54,4 +63,8 @@ class Api::V1::MediaController < Api::BaseController
   def processing_error
     { error: 'Error processing thumbnail for uploaded media' }
   end
+
+  def in_usage_error
+    { error: 'Media attachment is currently used by a status' }
+  end
 end

config/routes/api.rb

@@ -77,7 +77,7 @@ namespace :api, format: false do
       end
     end
 
-    resources :media, only: [:create, :update, :show]
+    resources :media, only: [:create, :update, :show, :destroy]
     resources :blocks, only: [:index]
     resources :mutes, only: [:index]
     resources :favourites, only: [:index]

spec/requests/api/v1/media_spec.rb

@@ -193,4 +193,57 @@ RSpec.describe 'Media' do
       end
     end
   end
+
+  describe 'DELETE /api/v1/media/:id' do
+    subject do
+      delete "/api/v1/media/#{media.id}", headers: headers
+    end
+
+    context 'when media is not attached to a status' do
+      let(:media) { Fabricate(:media_attachment, account: user.account, status: nil) }
+
+      it 'returns http empty response' do
+        subject
+
+        expect(response).to have_http_status(200)
+        expect(response.content_type)
+          .to start_with('application/json')
+
+        expect(MediaAttachment.where(id: media.id)).to_not exist
+      end
+    end
+
+    context 'when media is attached to a status' do
+      let(:media) { Fabricate(:media_attachment, account: user.account, status: Fabricate.build(:status)) }
+
+      it 'returns http unprocessable entity' do
+        subject
+
+        expect(response).to have_http_status(422)
+        expect(response.content_type)
+          .to start_with('application/json')
+        expect(response.parsed_body).to match(
+          a_hash_including(
+            error: 'Media attachment is currently used by a status'
+          )
+        )
+
+        expect(MediaAttachment.where(id: media.id)).to exist
+      end
+    end
+
+    context 'when the media belongs to somebody else' do
+      let(:media) { Fabricate(:media_attachment, status: nil) }
+
+      it 'returns http not found' do
+        subject
+
+        expect(response).to have_http_status(404)
+        expect(response.content_type)
+          .to start_with('application/json')
+
+        expect(MediaAttachment.where(id: media.id)).to exist
+      end
+    end
+  end
 end