Fix `POST /api/v1/emails/confirmations` not being available after sign-up (#17743)

app/controllers/api/v1/emails/confirmations_controller.rb

 # frozen_string_literal: true
 
 class Api::V1::Emails::ConfirmationsController < Api::BaseController
-  before_action :doorkeeper_authorize!
+  before_action -> { doorkeeper_authorize! :write, :'write:accounts' }
   before_action :require_user_owned_by_application!
   before_action :require_user_not_confirmed!
 
@@ -19,6 +19,6 @@ class Api::V1::Emails::ConfirmationsController < Api::BaseController
   end
 
   def require_user_not_confirmed!
-    render json: { error: 'This method is only available while the e-mail is awaiting confirmation' }, status: :forbidden if current_user.confirmed? || current_user.unconfirmed_email.blank?
+    render json: { error: 'This method is only available while the e-mail is awaiting confirmation' }, status: :forbidden unless !current_user.confirmed? || current_user.unconfirmed_email.present?
   end
 end

spec/controllers/api/v1/emails/confirmations_controller_spec.rb

+require 'rails_helper'
+
+RSpec.describe Api::V1::Emails::ConfirmationsController, type: :controller do
+  let(:confirmed_at) { nil }
+  let(:user)         { Fabricate(:user, confirmed_at: confirmed_at) }
+  let(:app)          { Fabricate(:application) }
+  let(:token)        { Fabricate(:accessible_access_token, resource_owner_id: user.id, scopes: scopes, application: app) }
+  let(:scopes)       { 'write' }
+
+  describe '#create' do
+    context 'with an oauth token' do
+      before do
+        allow(controller).to receive(:doorkeeper_token) { token }
+      end
+
+      context 'from a random app' do
+        it 'returns http forbidden' do
+          post :create
+          expect(response).to have_http_status(:forbidden)
+        end
+      end
+
+      context 'from an app that created the account' do
+        before do
+          user.update(created_by_application: token.application)
+        end
+
+        context 'when the account is already confirmed' do
+          let(:confirmed_at) { Time.now.utc }
+
+          it 'returns http forbidden' do
+            post :create
+            expect(response).to have_http_status(:forbidden)
+          end
+
+          context 'but user changed e-mail and has not confirmed it' do
+            before do
+              user.update(email: 'foo@bar.com')
+            end
+
+            it 'returns http success' do
+              post :create
+              expect(response).to have_http_status(:success)
+            end
+          end
+        end
+
+        context 'when the account is unconfirmed' do
+          it 'returns http success' do
+            post :create
+            expect(response).to have_http_status(:success)
+          end
+        end
+      end
+    end
+
+    context 'without an oauth token' do
+      it 'returns http unauthorized' do
+        post :create
+        expect(response).to have_http_status(:unauthorized)
+      end
+    end
+  end
+end