Use sorcery for logins

This gives us more flexibility and allows us to use password authentication
later. Also we don't need to build the login functionality ourself.

db/migrate/20200413101920_sorcery_core.rb

@@ -0,0 +1,15 @@
+class SorceryCore < ActiveRecord::Migration[6.0]
+  def change
+    add_column :users, :crypted_password, :string
+    add_column :users, :salt, :string
+    add_column :users, :magic_login_token, :string
+    add_column :users, :magic_login_token_expires_at, :datetime
+    add_column :users, :magic_login_email_sent_at, :datetime
+
+    add_column :authentications, :provider, :string, null: false
+    add_column :authentications, :uid, :string, null: false
+
+    add_index :users, :magic_login_token
+    add_index :users, :email, unique: true
+  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: 2020_04_12_214304) do
+ActiveRecord::Schema.define(version: 2020_04_13_101920) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -45,6 +45,8 @@ ActiveRecord::Schema.define(version: 2020_04_12_214304) do
     t.datetime "updated_at", precision: 6, null: false
     t.text "access_token_ciphertext"
     t.text "refresh_token_ciphertext"
+    t.string "provider"
+    t.string "uid"
   end
 
   create_table "forms", force: :cascade do |t|
@@ -74,6 +76,13 @@ ActiveRecord::Schema.define(version: 2020_04_12_214304) do
     t.string "google_id"
     t.datetime "created_at", precision: 6, null: false
     t.datetime "updated_at", precision: 6, null: false
+    t.string "crypted_password"
+    t.string "salt"
+    t.string "magic_login_token"
+    t.datetime "magic_login_token_expires_at"
+    t.datetime "magic_login_email_sent_at"
+    t.index ["email"], name: "index_users_on_email", unique: true
+    t.index ["magic_login_token"], name: "index_users_on_magic_login_token"
   end
 
   add_foreign_key "active_storage_attachments", "active_storage_blobs", column: "blob_id"