commit 5d4d4e8495d4873bf55fca688f001193a14c5aa9
Author: theMarinac <nikola.djordjevic4@pmf.edu.rs>
Date:   Wed Dec 11 14:48:47 2019 +0100

    Readme add

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+# Auth tutorial for setting up basic user auth with `put_session()`
+
+**NOTE: PHOENIX_APP and PHOENIX_APP_WEB are just macros here, in your app user your apps name!**
+
+## Deps used
+
+```bash
+# Admin auth
+{:basic_auth, "~> 2.2.2"},
+# Password hashing
+{:bcrypt_elixir, "~> 2.0"}
+```
+
+## Setup
+
+Start off by running `mix deps.get`
+
+### User Schema
+
+Make sure that you have some context that is like `Accounts.User` with `email:unique` and `password_hash` and that you have `Accounts` module with `get_user!(id)`... etc.
+
+You can do this with
+
+```bash
+terminal:~/PHOENIX_PROJECT/$ mix phx.gen.html Accounts User users email:string:unique password_hash:string
+```
+
+### Password hashing
+
+After that open up `accounts/user.ex` and add line bellow to `changeset()`
+
+```elixir
+def changeset(user, attrs) do
+  ...
+  |> update_change(:password_hash, &Bcrypt.hash_pwd_salt/1)
+end
+```
+
+### Auth helper
+
+In `PHOENIX_APP_WEB/` create folder `/helpers` and create file `auth.ex`
+
+```elixir
+defmodule PHOENIX_APP_WEB.Helpers.Auth do
+  import Plug.Conn, only: [get_session: 2]
+  alias PHOENIX_APP.{Repo, Accounts.User}
+
+  def signed_in?(conn) do
+    user_id = get_session(conn, :current_user_id)
+    if user_id, do: !!Repo.get(User, user_id)
+  end
+end
+```
+
+Then open your `PHOENIX_APP_WEB.ex` and inside add this `import`, we are doing this because we want to have this function in every `view`
+
+```elixir
+def view do
+  quote do
+    ...
+    import PHOENIX_APP_WEB.Helpers.Auth, only: [signed_in?: 1]
+  end
+end
+```
+
+### Session templates/view/router/controller
+
+#### Templates
+
+Create `/session` folder in `/templates` and inside create 2 files `sign-in.html.eex` and `sign-up.html.eex`
+One will be used for Signing in and the other for Signing out
+
+###### /session/sign-in.html
+
+```elixir
+<%= form_for @conn, Routes.session_path(@conn, :create_session),[as: :session] , fn f -> %>
+
+  <%= label f, :email %>
+  <%= text_input f, :email %>
+  <%= error_tag f, :email %>
+
+  <%= label f, :password %>
+  <%= password_input f, :password_hash %>
+  <%= error_tag f, :password_hash %>
+
+  <div>
+    <%= submit "Sign in" %>
+  </div>
+<% end %>
+
+```
+
+###### /session/sign-up.html
+
+```elixir
+<%= form_for @changeset, Routes.session_path(@conn, :create_user) , fn f -> %>
+  <%= if @changeset.action do %>
+    <div class="alert alert-danger">
+      <p>Oops, something went wrong! Please check the errors below.</p>
+    </div>
+  <% end %>
+
+  <%= label f, :email %>
+  <%= text_input f, :email %>
+  <%= error_tag f, :email %>
+
+  <%= label f, :password %>
+  <%= password_input f, :password_hash %>
+  <%= error_tag f, :password_hash %>
+
+  <div>
+    <%= submit "Sign up" %>
+  </div>
+<% end %>
+
+```
+
+#### Views
+
+Create `session_view.ex` in `/views` folder 
+
+```elixir
+defmodule PHOENIX_APP_WEB.SessionView do
+  use PHOENIX_APP_WEB, :view
+end
+```
+
+#### Router
+
+under you  `scope "/"` add following
+
+```elixir
+scope "/", PHOENIX_APP_WEB do
+  pipe_through :browser
+  ...
+  # Sign in
+  get "/sign-in", SessionController, :sign_in
+  post"/sign-in", SessionController, :create_session
+
+  # Sign up
+  get "/sign-up", SessionController, :sign_up
+  post"/sign-up", SessionController, :create_user
+
+  # Sign out
+  post "/sign-out", SessionController, :sign_out
+end
+```
+
+#### Controller
+
+```elixir
+defmodule PHOENIX_APP_WEB.SessionController do
+  use PHOENIX_APP_WEB, :controller
+
+  alias PHOENIX_APP.Accounts
+  alias Accounts.User
+
+  def sign_in(conn, _params) do
+    # If user is logged in and tries to connecto to "/sign-in" redirect him
+    if is_logged?(conn) do
+      redirect(conn, to: Routes.user_path(conn, :show))
+    else
+      render(conn, "sign-in.html")
+    end
+  end
+
+  def sign_up(conn, _params) do
+    # If user is logged in and tries to connecto to "/sign-up" redirect him
+    if is_logged?(conn) do
+      redirect(conn, to: Routes.user_path(conn, :show))
+    else
+      changeset = Accounts.change_user(%User{})
+      render(conn, "sign-up.html", changeset: changeset)
+    end
+  end
+
+  defp is_logged?(conn), do: !!get_session(conn, :current_user_id)
+
+  def create_session(conn, %{"session" => auth_params} = _params) do
+    user = Accounts.get_by_email(auth_params["email"])
+
+    case Bcrypt.check_pass(user, auth_params["password_hash"]) do
+      {:ok, user} ->
+        conn
+        |> put_session(:current_user_id, user.id)
+        |> put_flash(:info, "Sign in, successful!")
+        |> redirect(to: Routes.user_path(conn, :show))
+
+      {:error, _} ->
+        conn
+        |> put_flash(:error, "Invalid e-mail/password. Try again!")
+        |> redirect(to: Routes.session_path(conn, :sign_in))
+    end
+  end
+
+  def create_user(conn, %{"user" => user_params}) do
+    case Accounts.create_user(user_params) do
+      {:ok, user} ->
+        conn
+        |> put_session(:current_user_id, user.id)
+        |> put_flash(:info, "Sign up, successful!")
+        |> redirect(to: Routes.user_path(conn, :show))
+
+      {:error, %Ecto.Changeset{} = changeset} ->
+        render(conn, "sign-up.html", changeset: changeset)
+    end
+  end
+
+  def sign_out(conn, _params) do
+    conn
+    |> delete_session(:current_user_id)
+    |> put_flash(:info, "Signed out.")
+    |> redirect(to: Routes.page_path(conn, :index))
+  end
+end
+
+```
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