Done

Gemfile.lock

@@ -99,6 +99,7 @@ GEM
 
 PLATFORMS
   ruby
+  x86_64-linux
 
 DEPENDENCIES
   activerecord (<= 5.1)
@@ -117,4 +118,4 @@ DEPENDENCIES
   tux
 
 BUNDLED WITH
-   2.0.1
+   2.2.2

app/controllers/application_controller.rb

@@ -17,7 +17,12 @@ class ApplicationController < Sinatra::Base
   end
 
   post "/signup" do
-    #your code here
+    if params[:username] == "" || params[:password] == ""
+      redirect '/failure'
+    else
+      User.create(username: params[:username], password: params[:password])
+      redirect '/login'
+    end
 
   end
 
@@ -32,9 +37,15 @@ class ApplicationController < Sinatra::Base
   end
 
   post "/login" do
-    ##your code here
+    @user = User.find_by(username: params[:username])
+    if @user && @user.authenticate(params[:password])
+      session[:user_id] = @user.id
+      redirect to "/account"
+    else
+      redirect to "/failure"
+    end
   end
-
+  
   get "/failure" do
     erb :failure
   end
@@ -54,4 +65,4 @@ def current_user
     end
   end
 
-end
+end

app/models/user.rb

@@ -1,2 +1,3 @@
 class User < ActiveRecord::Base
+    has_secure_password
 end

app/views/account.erb

@@ -1,4 +1,4 @@
-<h1>Welcome</h1>
+<h1>Welcome <%=@user.username %></h1>
 
 <p>We are currently working on your account.</p>
 

db/migrate/20210227183923_create_users.rb

@@ -0,0 +1,8 @@
+class CreateUsers < ActiveRecord::Migration[5.1]
+  def change
+    create_table :users do |t|
+      t.string :username
+      t.string :password_digest
+    end
+  end
+end

db/schema.rb

@@ -0,0 +1,20 @@
+# This file is auto-generated from the current state of the database. Instead
+# of editing this file, please use the migrations feature of Active Record to
+# incrementally modify your database, and then regenerate this schema definition.
+#
+# Note that this schema.rb definition is the authoritative source for your
+# database schema. If you need to create the application database on another
+# system, you should be using db:schema:load, not running all the migrations
+# from scratch. The latter is a flawed and unsustainable approach (the more migrations
+# you'll amass, the slower it'll run and the greater likelihood for issues).
+#
+# It's strongly recommended that you check this file into your version control system.
+
+ActiveRecord::Schema.define(version: 20210227183923) do
+
+  create_table "users", force: :cascade do |t|
+    t.string "username"
+    t.string "password_digest"
+  end
+
+end