feat: add a common upload endpoint (#7806)

Co-authored-by: Sivin Varghese <64252451+iamsivin@users.noreply.github.com>

spec/controllers/api/v1/upload_controller_spec.rb

@@ -0,0 +1,42 @@
+require 'rails_helper'
+
+RSpec.describe 'Api::V1::UploadController', type: :request do
+  describe 'POST /api/v1/upload/' do
+    let(:account) { create(:account) }
+    let(:user) { create(:user, account: account) }
+
+    it 'uploads the image when authorized' do
+      file = fixture_file_upload(Rails.root.join('spec/assets/avatar.png'), 'image/png')
+
+      post '/api/v1/upload/',
+           headers: user.create_new_auth_token,
+           params: { attachment: file }
+
+      expect(response).to have_http_status(:success)
+      blob = response.parsed_body
+
+      expect(blob['errors']).to be_nil
+
+      expect(blob['file_url']).to be_present
+      expect(blob['blob_key']).to be_present
+      expect(blob['blob_id']).to be_present
+    end
+
+    it 'does not upload when un-authorized' do
+      file = fixture_file_upload(Rails.root.join('spec/assets/avatar.png'), 'image/png')
+
+      post '/api/v1/upload/',
+           headers: {},
+           params: { attachment: file }
+
+      expect(response).to have_http_status(:unauthorized)
+      blob = response.parsed_body
+
+      expect(blob['errors']).to be_present
+
+      expect(blob['file_url']).to be_nil
+      expect(blob['blob_key']).to be_nil
+      expect(blob['blob_id']).to be_nil
+    end
+  end
+end