Merge branch 'unique-emails' into 'develop'

Unique emails

See merge request gab/social/gab-social!46

app/models/user.rb

@@ -39,6 +39,7 @@
 #  created_by_application_id :bigint(8)
 #  approved                  :boolean          default(TRUE), not null
 #  last_read_notification    :bigint(8)
+#  unique_email              :string
 #
 
 class User < ApplicationRecord
@@ -79,6 +80,7 @@ class User < ApplicationRecord
   accepts_nested_attributes_for :invite_request, reject_if: ->(attributes) { attributes['text'].blank? }
 
   validates :locale, inclusion: I18n.available_locales.map(&:to_s), if: :locale?
+  validates :unique_email, uniqueness: true
   validates_with BlacklistedEmailValidator, on: :create
   validates_with EmailMxValidator, if: :validate_email_dns?
   validates :agreement, acceptance: { allow_nil: false, accept: [true, 'true', '1'] }, on: :create
@@ -94,6 +96,7 @@ class User < ApplicationRecord
   scope :emailable, -> { confirmed.enabled.joins(:account).merge(Account.searchable) }
 
   before_validation :sanitize_languages
+  before_validation :set_unique_email
   before_create :set_approved
 
   # This avoids a deprecation warning from Rails 5.1
@@ -217,7 +220,7 @@ class User < ApplicationRecord
   def allows_group_in_home_feed?
     settings.group_in_home_feed
   end
- 
+
   def token_for_app(a)
     return nil if a.nil? || a.owner != self
     Doorkeeper::AccessToken
@@ -346,4 +349,10 @@ class User < ApplicationRecord
     end
   end
 
+  def set_unique_email
+    user, domain = self.email.split('@')
+    user = user.split('+').first
+    user = user.gsub('.', '') if domain == 'gmail.com'
+    self.unique_email = "#{user}@#{domain}"
+  end
 end

db/migrate/20200310223351_add_unique_email_to_users.rb

@@ -0,0 +1,5 @@
+class AddUniqueEmailToUsers < ActiveRecord::Migration[5.2]
+  def change
+    add_column :users, :unique_email, :string
+  end
+end

db/migrate/20200310224203_add_index_unique_email_on_users.rb

@@ -0,0 +1,7 @@
+class AddIndexUniqueEmailOnUsers < ActiveRecord::Migration[5.2]
+  disable_ddl_transaction!
+
+  def change
+    add_index :users, :unique_email, algorithm: :concurrently
+  end
+end

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 2019_12_02_004114) do
+ActiveRecord::Schema.define(version: 2020_03_10_224203) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -824,11 +824,13 @@ ActiveRecord::Schema.define(version: 2019_12_02_004114) do
     t.bigint "created_by_application_id"
     t.boolean "approved", default: true, null: false
     t.bigint "last_read_notification"
+    t.string "unique_email"
     t.index ["account_id"], name: "index_users_on_account_id"
     t.index ["confirmation_token"], name: "index_users_on_confirmation_token", unique: true
     t.index ["created_by_application_id"], name: "index_users_on_created_by_application_id"
     t.index ["email"], name: "index_users_on_email", unique: true
     t.index ["reset_password_token"], name: "index_users_on_reset_password_token", unique: true
+    t.index ["unique_email"], name: "index_users_on_unique_email"
   end
 
   create_table "web_push_subscriptions", force: :cascade do |t|