feat(pastes): add REST routes to view and create pastes

Signed-off-by: Amogh Lele <amogh@dyte.io>

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