From 5d4d8285fbf96eac3b03b35ab9942d9dbb06cf28 Mon Sep 17 00:00:00 2001
From: shibao <shibao@bubbletea.dev>
Date: Fri, 10 Sep 2021 22:22:18 -0400
Subject: [PATCH] add invite link and registration validation

---
 lib/cannery/invites.ex                        |  19 ++-
 lib/cannery/invites/invite.ex                 |   1 +
 .../user_registration_controller.ex           |  61 +++++++++-
 .../live/invite_live/form_component.ex        |   2 +-
 .../live/invite_live/form_component.html.leex |  22 +++-
 lib/cannery_web/live/invite_live/index.ex     |  44 ++++---
 .../live/invite_live/index.html.leex          | 111 +++++++++++++-----
 lib/cannery_web/live/invite_live/show.ex      |  21 ----
 .../live/invite_live/show.html.leex           |  27 -----
 lib/cannery_web/router.ex                     |   3 -
 .../templates/user_registration/new.html.eex  |   8 +-
 11 files changed, 207 insertions(+), 112 deletions(-)
 delete mode 100644 lib/cannery_web/live/invite_live/show.ex
 delete mode 100644 lib/cannery_web/live/invite_live/show.html.leex

diff --git a/lib/cannery/invites.ex b/lib/cannery/invites.ex
index e7e4902..0b45916 100644
--- a/lib/cannery/invites.ex
+++ b/lib/cannery/invites.ex
@@ -50,13 +50,21 @@ defmodule Cannery.Invites do
   @spec get_invite_by_token(String.t()) :: Invite.t() | nil
   def get_invite_by_token(nil), do: nil
   def get_invite_by_token(""), do: nil
-  def get_invite_by_token(token), do: Repo.get_by(Invite, token: token, disabled_at: nil)
+
+  def get_invite_by_token(token) do
+    Repo.one(
+      from i in Invite,
+        where: i.token == ^token and i.disabled_at |> is_nil()
+    )
+  end
 
   @doc """
-  Uses invite by decrementing uses_left, or markes invite invalid if it's been completely used
-
+  Uses invite by decrementing uses_left, or marks invite invalid if it's been
+  completely used.
   """
   @spec use_invite!(Invite.t()) :: Invite.t()
+  def use_invite!(%Invite{uses_left: nil} = invite), do: invite
+
   def use_invite!(%Invite{uses_left: uses_left} = invite) do
     new_uses_left = uses_left - 1
 
@@ -96,7 +104,10 @@ defmodule Cannery.Invites do
       attrs
       |> Map.merge(%{
         "user_id" => user_id,
-        "token" => :crypto.strong_rand_bytes(@invite_token_length)
+        "token" =>
+          :crypto.strong_rand_bytes(@invite_token_length)
+          |> Base.url_encode64()
+          |> binary_part(0, @invite_token_length)
       })
 
     %Invite{} |> Invite.changeset(attrs) |> Repo.insert()
diff --git a/lib/cannery/invites/invite.ex b/lib/cannery/invites/invite.ex
index 26462cd..ba45a65 100644
--- a/lib/cannery/invites/invite.ex
+++ b/lib/cannery/invites/invite.ex
@@ -20,6 +20,7 @@ defmodule Cannery.Invites.Invite do
     invite
     |> cast(attrs, [:name, :token, :uses_left, :disabled_at, :user_id])
     |> validate_required([:name, :token, :user_id])
+    |> validate_number(:uses_left, greater_than_or_equal_to: 0)
   end
 
   @type t :: %{
diff --git a/lib/cannery_web/controllers/user_registration_controller.ex b/lib/cannery_web/controllers/user_registration_controller.ex
index 6ba56f8..f9e844e 100644
--- a/lib/cannery_web/controllers/user_registration_controller.ex
+++ b/lib/cannery_web/controllers/user_registration_controller.ex
@@ -1,18 +1,67 @@
 defmodule CanneryWeb.UserRegistrationController do
   use CanneryWeb, :controller
 
-  alias Cannery.Accounts
+  alias Cannery.{Accounts, Invites}
   alias Cannery.Accounts.User
   alias CanneryWeb.UserAuth
 
-  def new(conn, _params) do
-    changeset = Accounts.change_user_registration(%User{})
-    render(conn, "new.html", changeset: changeset)
+  def new(conn, %{"invite" => invite_token}) do
+    invite = Invites.get_invite_by_token(invite_token)
+
+    if invite do
+      conn |> render_new(invite)
+    else
+      conn
+      |> put_flash(:error, "Sorry, this invite was not found or expired")
+      |> redirect(to: Routes.home_path(CanneryWeb.Endpoint, :index))
+    end
   end
 
-  def create(conn, %{"user" => user_params}) do
+  def new(conn, _params) do
+    if Accounts.allow_registration?() do
+      conn |> render_new()
+    else
+      conn
+      |> put_flash(:error, "Sorry, public registration is disabled")
+      |> redirect(to: Routes.home_path(CanneryWeb.Endpoint, :index))
+    end
+  end
+
+  # renders new user registration page
+  defp render_new(conn, invite \\ nil) do
+    changeset = Accounts.change_user_registration(%User{})
+    conn |> render("new.html", changeset: changeset, invite: invite)
+  end
+
+  def create(conn, %{"user" => %{"invite_token" => invite_token}} = attrs) do
+    invite = Invites.get_invite_by_token(invite_token)
+
+    if invite do
+      conn |> create_user(attrs, invite)
+    else
+      conn
+      |> put_flash(:error, "Sorry, this invite was not found or expired")
+      |> redirect(to: Routes.home_path(CanneryWeb.Endpoint, :index))
+    end
+  end
+
+  def create(conn, attrs) do
+    if Accounts.allow_registration?() do
+      conn |> create_user(attrs)
+    else
+      conn
+      |> put_flash(:error, "Sorry, public registration is disabled")
+      |> redirect(to: Routes.home_path(CanneryWeb.Endpoint, :index))
+    end
+  end
+
+  defp create_user(conn, %{"user" => user_params}, invite \\ nil) do
     case Accounts.register_user(user_params) do
       {:ok, user} ->
+        unless invite |> is_nil() do
+          invite |> Invites.use_invite!()
+        end
+
         {:ok, _} =
           Accounts.deliver_user_confirmation_instructions(
             user,
@@ -24,7 +73,7 @@ defmodule CanneryWeb.UserRegistrationController do
         |> UserAuth.log_in_user(user)
 
       {:error, %Ecto.Changeset{} = changeset} ->
-        render(conn, "new.html", changeset: changeset)
+        render(conn, "new.html", changeset: changeset, invite: invite)
     end
   end
 end
diff --git a/lib/cannery_web/live/invite_live/form_component.ex b/lib/cannery_web/live/invite_live/form_component.ex
index 37731e4..402b1f5 100644
--- a/lib/cannery_web/live/invite_live/form_component.ex
+++ b/lib/cannery_web/live/invite_live/form_component.ex
@@ -37,7 +37,7 @@ defmodule CanneryWeb.InviteLive.FormComponent do
 
       {:error, %Ecto.Changeset{} = changeset} ->
         {:noreply, assign(socket, :changeset, changeset)}
-    end
+      end
   end
 
   defp save_invite(socket, :new, invite_params) do
diff --git a/lib/cannery_web/live/invite_live/form_component.html.leex b/lib/cannery_web/live/invite_live/form_component.html.leex
index 46aea75..59304db 100644
--- a/lib/cannery_web/live/invite_live/form_component.html.leex
+++ b/lib/cannery_web/live/invite_live/form_component.html.leex
@@ -1,14 +1,28 @@
-<h2><%= @title %></h2>
+<h2 class="title text-xl text-primary-500">
+  <%= @title %>
+</h2>
 
 <%= f = form_for @changeset, "#",
   id: "invite-form",
+  class: "grid grid-cols-3 justify-center items-center space-y-4",
   phx_target: @myself,
   phx_change: "validate",
   phx_submit: "save" %>
 
   <%= label f, :name, class: "title text-lg text-primary-500" %>
-  <%= text_input f, :name, class: "input input-primary" %>
-  <%= error_tag f, :name %>
+  <%= text_input f, :name, class: "input input-primary col-span-2" %>
+  <span class="col-span-3">
+    <%= error_tag f, :name %>
+  </span>
 
-  <%= submit "Save", phx_disable_with: "Saving..." %>
+  <%= label f, :uses_left, class: "title text-lg text-primary-500" %>
+  <%= number_input f, :uses_left, min: 0, class: "input input-primary col-span-2" %>
+  <span class="col-span-3">
+    <%= error_tag f, :uses_left %>
+  </span>
+
+  <div class="flex flex-row justify-center items-center space-x-4 col-span-3">
+    <%= submit "Save", class: "btn btn-primary",
+      phx_disable_with: "Saving..." %>
+  </div>
 </form>
diff --git a/lib/cannery_web/live/invite_live/index.ex b/lib/cannery_web/live/invite_live/index.ex
index 7c6c0ab..93f1bb0 100644
--- a/lib/cannery_web/live/invite_live/index.ex
+++ b/lib/cannery_web/live/invite_live/index.ex
@@ -1,46 +1,62 @@
 defmodule CanneryWeb.InviteLive.Index do
   use CanneryWeb, :live_view
 
-  alias Cannery.Invites
-  alias Cannery.Invites.Invite
+  alias Cannery.{Invites}
+  alias Cannery.Invites.{Invite}
 
   @impl true
   def mount(_params, session, socket) do
-    {:ok, socket |> assign_defaults(session) |> assign(invites: list_invites())}
+    {:ok, socket |> assign_defaults(session) |> display_invites()}
   end
 
   @impl true
   def handle_params(params, _url, socket) do
-    {:noreply, apply_action(socket, socket.assigns.live_action, params)}
+    {:noreply, socket |> apply_action(socket.assigns.live_action, params)}
   end
 
   defp apply_action(socket, :edit, %{"id" => id}) do
     socket
-    |> assign(:page_title, "Edit Invite")
-    |> assign(:invite, Invites.get_invite!(id))
+    |> assign(page_title: "Edit Invite", invite: Invites.get_invite!(id))
   end
 
   defp apply_action(socket, :new, _params) do
     socket
-    |> assign(:page_title, "New Invite")
-    |> assign(:invite, %Invite{})
+    |> assign(page_title: "New Invite", invite: %Invite{})
   end
 
   defp apply_action(socket, :index, _params) do
     socket
-    |> assign(:page_title, "Listing Invites")
-    |> assign(:invite, nil)
+    |> assign(page_title: "Listing Invites", invite: nil)
   end
 
   @impl true
   def handle_event("delete", %{"id" => id}, socket) do
     invite = Invites.get_invite!(id)
     {:ok, _} = Invites.delete_invite(invite)
-
-    {:noreply, assign(socket, :invites, list_invites())}
+    {:noreply, socket |> display_invites()}
   end
 
-  defp list_invites do
-    Invites.list_invites()
+  def handle_event("set_unlimited", %{"id" => id}, socket) do
+    id |> Invites.get_invite!() |> Invites.update_invite(%{"uses_left" => nil})
+    {:noreply, socket |> display_invites()}
+  end
+
+  def handle_event("enable", %{"id" => id}, socket) do
+    attrs = %{"uses_left" => nil, "disabled_at" => nil}
+    id |> Invites.get_invite!() |> Invites.update_invite(attrs)
+    {:noreply, socket |> display_invites()}
+  end
+
+  def handle_event("disable", %{"id" => id}, socket) do
+    now = NaiveDateTime.utc_now() |> NaiveDateTime.truncate(:second)
+    attrs = %{"uses_left" => 0, "disabled_at" => now}
+    id |> Invites.get_invite!() |> Invites.update_invite(attrs)
+    {:noreply, socket |> display_invites()}
+  end
+
+  # redisplays invites to socket
+  defp display_invites(socket) do
+    invites = Invites.list_invites()
+    socket |> assign(:invites, invites)
   end
 end
diff --git a/lib/cannery_web/live/invite_live/index.html.leex b/lib/cannery_web/live/invite_live/index.html.leex
index d130327..0b00a3b 100644
--- a/lib/cannery_web/live/invite_live/index.html.leex
+++ b/lib/cannery_web/live/invite_live/index.html.leex
@@ -1,4 +1,82 @@
-<h1>Listing Invites</h1>
+<div class="flex flex-col space-y-8 justify-center items-center">
+  <h1 class="title text-2xl title-primary-500">
+    Listing Invites
+  </h1>
+
+  <%= if @invites |> Enum.empty?() do %>
+    <div class="flex flex-col space-y-4 justify-center items-center">
+      <h1 class="title text-xl text-primary-500">
+        No invites 😔
+      </h1>
+
+      <%= live_patch to: Routes.invite_index_path(@socket, :new),
+        class: "btn btn-primary" do %>
+        Invite someone new!
+      <% end %>
+    </div>
+  <% else %>
+    <%= live_patch to: Routes.invite_index_path(@socket, :new),
+      class: "btn btn-primary" do %>
+      Invite
+    <% end %>
+  <% end %>
+
+  <div class="flex flex-row flex-wrap space-x-4 space-y-4">
+    <%= for invite <- @invites do %>
+      <div class="px-8 py-4 flex flex-col justify-center items-center space-y-4
+        border border-gray-400 rounded-lg shadow-lg hover:shadow-md">
+        <h1 class="title text-xl text-primary-500">
+          <%= invite.name %>
+        </h1>
+
+        <%= if invite.disabled_at |> is_nil() do %>
+          <h2 class="title text-md text-primary-500">
+            Uses Left: <%= invite.uses_left || "Unlimited" %>
+          </h2>
+        <% else %>
+          <h2 class="title text-md text-primary-500">
+            Invite Disabled
+          </h2>
+        <% end %>
+
+        <code class="text-xs px-4 py-2 rounded-lg text-gray-100 bg-primary-800">
+          <%= Routes.user_registration_url(@socket, :new, invite: invite.token) %>
+        </code>
+
+        <div class="flex space-x-4 justify-center items-center">
+          <%= live_patch "Edit", to: Routes.invite_index_path(@socket, :edit, invite),
+            class: "text-primary-500 link" %>
+
+          <%= link "Delete", to: "#",
+            class: "text-primary-500 link",
+            phx_click: "delete",
+            phx_value_id: invite.id,
+            data: [confirm: "Are you sure?"] %>
+
+          <%= if invite.disabled_at |> is_nil() do %>
+            <a href="#" class="text-primary-500 link"
+              phx-click="disable" phx-value-id="<%= invite.id %>">
+              Disable
+            </a>
+          <% else %>
+            <a href="#" class="text-primary-500 link"
+              phx-click="enable" phx-value-id="<%= invite.id %>">
+              Enable
+            </a>
+          <% end %>
+
+          <%= if invite.disabled_at |> is_nil() and not(invite.uses_left |> is_nil()) do %>
+            <a href="#" class="text-primary-500 link"
+              phx-click="set_unlimited" phx-value-id="<%= invite.id %>"
+              data-confirm="Are you sure you want to make this invite unlimited?">
+              Set Unlimited
+            </a>
+          <% end %>
+        </div>
+      </div>
+    <% end %>
+  </div>
+</div>
 
 <%= if @live_action in [:new, :edit] do %>
   <%= live_modal CanneryWeb.InviteLive.FormComponent,
@@ -6,33 +84,6 @@
     title: @page_title,
     action: @live_action,
     invite: @invite,
-    return_to: Routes.invite_index_path(@socket, :index) %>
+    return_to: Routes.invite_index_path(@socket, :index),
+    current_user: @current_user %>
 <% end %>
-
-<table>
-  <thead>
-    <tr>
-      <th>Name</th>
-      <th>Token</th>
-      <th>Uses left</th>
-      <th></th>
-    </tr>
-  </thead>
-  <tbody id="invites">
-    <%= for invite <- @invites do %>
-      <tr id="invite-<%= invite.id %>">
-        <td><%= invite.name %></td>
-        <td><%= invite.token %></td>
-        <td><%= invite.uses_left || "Unlimited" %></td>
-
-        <td>
-          <span><%= live_redirect "Show", to: Routes.invite_show_path(@socket, :show, invite) %></span>
-          <span><%= live_patch "Edit", to: Routes.invite_index_path(@socket, :edit, invite) %></span>
-          <span><%= link "Delete", to: "#", phx_click: "delete", phx_value_id: invite.id, data: [confirm: "Are you sure?"] %></span>
-        </td>
-      </tr>
-    <% end %>
-  </tbody>
-</table>
-
-<span><%= live_patch "New Invite", to: Routes.invite_index_path(@socket, :new) %></span>
diff --git a/lib/cannery_web/live/invite_live/show.ex b/lib/cannery_web/live/invite_live/show.ex
deleted file mode 100644
index 5e3150c..0000000
--- a/lib/cannery_web/live/invite_live/show.ex
+++ /dev/null
@@ -1,21 +0,0 @@
-defmodule CanneryWeb.InviteLive.Show do
-  use CanneryWeb, :live_view
-
-  alias Cannery.Invites
-
-  @impl true
-  def mount(_params, session, socket) do
-    {:ok, socket |> assign_defaults(session)}
-  end
-
-  @impl true
-  def handle_params(%{"id" => id}, _, socket) do
-    {:noreply,
-     socket
-     |> assign(:page_title, page_title(socket.assigns.live_action))
-     |> assign(:invite, Invites.get_invite!(id))}
-  end
-
-  defp page_title(:show), do: "Show Invite"
-  defp page_title(:edit), do: "Edit Invite"
-end
diff --git a/lib/cannery_web/live/invite_live/show.html.leex b/lib/cannery_web/live/invite_live/show.html.leex
deleted file mode 100644
index 2944516..0000000
--- a/lib/cannery_web/live/invite_live/show.html.leex
+++ /dev/null
@@ -1,27 +0,0 @@
-<h1>Show Invite</h1>
-
-<%= if @live_action in [:edit] do %>
-  <%= live_modal CanneryWeb.InviteLive.FormComponent,
-    id: @invite.id,
-    title: @page_title,
-    action: @live_action,
-    invite: @invite,
-    return_to: Routes.invite_show_path(@socket, :show, @invite) %>
-<% end %>
-
-<ul>
-
-  <li>
-    <strong>Name:</strong>
-    <%= @invite.name %>
-  </li>
-
-  <li>
-    <strong>Token:</strong>
-    <%= @invite.token %>
-  </li>
-
-</ul>
-
-<span><%= live_patch "Edit", to: Routes.invite_show_path(@socket, :edit, @invite), class: "button" %></span>
-<span><%= live_redirect "Back", to: Routes.invite_index_path(@socket, :index) %></span>
diff --git a/lib/cannery_web/router.ex b/lib/cannery_web/router.ex
index a14aa2b..43dfbab 100644
--- a/lib/cannery_web/router.ex
+++ b/lib/cannery_web/router.ex
@@ -87,9 +87,6 @@ defmodule CanneryWeb.Router do
     live "/invites", InviteLive.Index, :index
     live "/invites/new", InviteLive.Index, :new
     live "/invites/:id/edit", InviteLive.Index, :edit
-
-    live "/invites/:id", InviteLive.Show, :show
-    live "/invites/:id/show/edit", InviteLive.Show, :edit
   end
 
   scope "/", CanneryWeb do
diff --git a/lib/cannery_web/templates/user_registration/new.html.eex b/lib/cannery_web/templates/user_registration/new.html.eex
index 4718a19..f3ee7ec 100644
--- a/lib/cannery_web/templates/user_registration/new.html.eex
+++ b/lib/cannery_web/templates/user_registration/new.html.eex
@@ -11,6 +11,10 @@
       </div>
     <% end %>
 
+    <%= if @invite do %>
+      <%= hidden_input f, :invite_token, value: @invite.token %>
+    <% end %>
+
     <div class="grid grid-cols-3 justify-center items-center text-center space-x-4">
       <%= label f, :email, class: "title text-lg text-primary-500" %>
       <%= email_input f, :email, required: true, class: "input input-primary col-span-2" %>
@@ -24,7 +28,7 @@
     <%= error_tag f, :password %>
 
     <%= submit "Register", class: "btn btn-primary" %>
-    
+
     <hr class="hr">
 
     <div class="flex flex-row justify-center items-center space-x-4">
@@ -34,4 +38,4 @@
         class: "btn btn-primary" %>
     </div>
   <% end %>
-</div>
\ No newline at end of file
+</div>