From 20a0b45954cf7819cd9d51c401db06be0f47666b Mon Sep 17 00:00:00 2001
From: Amogh Lele <amogh@dyte.io>
Date: Sat, 7 May 2022 00:04:59 +0530
Subject: [PATCH] feat(pastes): add REST routes to view and create pastes

Signed-off-by: Amogh Lele <amogh@dyte.io>
---
 lib/ketbin/pastes/paste.ex                    |  1 +
 .../controllers/api/paste_controller.ex       | 46 +++++++++++++++++++
 lib/ketbin_web/router.ex                      |  8 ++++
 lib/ketbin_web/views/api/paste_view.ex        | 18 ++++++++
 4 files changed, 73 insertions(+)
 create mode 100644 lib/ketbin_web/controllers/api/paste_controller.ex
 create mode 100644 lib/ketbin_web/views/api/paste_view.ex

diff --git a/lib/ketbin/pastes/paste.ex b/lib/ketbin/pastes/paste.ex
index b0e36bf..a54b552 100644
--- a/lib/ketbin/pastes/paste.ex
+++ b/lib/ketbin/pastes/paste.ex
@@ -1,6 +1,7 @@
 defmodule Ketbin.Pastes.Paste do
   use Ecto.Schema
   import Ecto.Changeset
+  @derive {Jason.Encoder, only: [:content, :is_url, :belongs_to]}
 
   @primary_key {:id, :string, autogenerate: false}
   @derive {Phoenix.Param, key: :id}
diff --git a/lib/ketbin_web/controllers/api/paste_controller.ex b/lib/ketbin_web/controllers/api/paste_controller.ex
new file mode 100644
index 0000000..1bd8c41
--- /dev/null
+++ b/lib/ketbin_web/controllers/api/paste_controller.ex
@@ -0,0 +1,46 @@
+defmodule KetbinWeb.Api.PasteController do
+  use KetbinWeb, :controller
+
+  alias Ketbin.Pastes
+  alias Ketbin.Pastes.Paste
+  alias Ketbin.Pastes.Utils
+
+  def show(conn, %{"id" => id}) do
+    [head | _tail] = String.split(id, ".")
+
+    # fetch paste from db
+    paste = Pastes.get_paste!(head)
+    render(conn, "paste.json", paste: paste)
+  end
+
+  def create(%{assigns: %{current_user: current_user}} = conn, %{"paste" => paste_params}) do
+    # generate phonetic key
+    id = Utils.generate_key()
+
+    # check if content is a url
+    is_url =
+      Map.get(paste_params, "content")
+      |> Utils.is_url?()
+
+    # put id and is_url values into changeset
+    paste_params =
+      Map.put(paste_params, "id", id)
+      |> Map.put("is_url", is_url)
+      |> Map.put("belongs_to", current_user && current_user.id)
+
+    # attempt to create a paste
+    case Pastes.create_paste(paste_params) do
+      # all good
+      {:ok, paste} ->
+        conn
+        |> put_status(:created)
+        |> render("paste.json", paste: paste)
+
+      # something went wrong, bail
+      {:error, %Ecto.Changeset{} = _changeset} ->
+        conn
+        |> put_status(:internal_server_error)
+        |> render("error.json")
+    end
+  end
+end
diff --git a/lib/ketbin_web/router.ex b/lib/ketbin_web/router.ex
index 647fac1..7ed284d 100644
--- a/lib/ketbin_web/router.ex
+++ b/lib/ketbin_web/router.ex
@@ -14,6 +14,8 @@ defmodule KetbinWeb.Router do
 
   pipeline :api do
     plug :accepts, ["json"]
+    plug :fetch_session
+    plug :fetch_current_user
   end
 
   scope "/", KetbinWeb do
@@ -42,6 +44,12 @@ defmodule KetbinWeb.Router do
     put "/:id", PageController, :update
   end
 
+  scope "/api", KetbinWeb.Api, as: :api do
+    pipe_through :api
+
+    resources "/paste", PasteController, only: [:show, :index, :create]
+  end
+
   # Other scopes may use custom stacks.
   # scope "/api", KetbinWeb do
   #   pipe_through :api
diff --git a/lib/ketbin_web/views/api/paste_view.ex b/lib/ketbin_web/views/api/paste_view.ex
new file mode 100644
index 0000000..4de264f
--- /dev/null
+++ b/lib/ketbin_web/views/api/paste_view.ex
@@ -0,0 +1,18 @@
+defmodule KetbinWeb.Api.PasteView do
+  use KetbinWeb, :view
+
+  def render("paste.json", %{paste: paste}) do
+    %{
+      id: paste.id,
+      content: paste.content,
+      is_url: paste.is_url
+    }
+  end
+
+  def render("error.json", _assigns) do
+    %{
+      success: false,
+      msg: "Something went wrong"
+    }
+  end
+end