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shopifex
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Phoenix boilerplate for Shopify Embedded App SDK
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lib/shopifex/plug/shopify_session.ex
defmodule Shopifex.Plug.ShopifySession do
import Plug.Conn
import Phoenix.Controller
require Logger
def init(options) do
# initialize options
options
end
def call(conn, _) do
token = get_token_from_conn(conn) || Guardian.Plug.current_token(conn)
case Shopifex.Guardian.resource_from_token(token) do
{:ok, shop, claims} ->
locale = get_locale(conn, claims)
host = get_host(conn, claims)
Shopifex.Plug.build_session(conn, shop, host, locale)
_ ->
initiate_new_session(conn)
end
end
defp get_token_from_conn(%Plug.Conn{params: %{"token" => token}}), do: token
defp get_token_from_conn(conn) do
case Plug.Conn.get_req_header(conn, "authorization") do
[] -> nil
["Bearer " <> token | []] -> token
_ -> nil
end
end
defp initiate_new_session(conn) do
expected_hmac = Shopifex.Plug.build_hmac(conn)
received_hmac = Shopifex.Plug.get_hmac(conn)
if expected_hmac == received_hmac do
conn
|> do_new_session()
else
Logger.info("Invalid HMAC, expected #{expected_hmac}")
respond_invalid(conn)
end
end
defp do_new_session(conn = %{params: %{"shop" => shop_url}}) do
case Shopifex.Shops.get_shop_by_url(shop_url) do
nil ->
redirect_to_install(conn, shop_url)
shop ->
locale = get_locale(conn)
host = get_host(conn)
Shopifex.Plug.build_session(conn, shop, host, locale)
end
end
defp redirect_to_install(conn, shop_url) do
Logger.info("Initiating shop installation for #{shop_url}")
install_url =
"https://#{shop_url}/admin/oauth/authorize?client_id=#{Application.fetch_env!(:shopifex, :api_key)}&scope=#{Application.fetch_env!(:shopifex, :scopes)}&redirect_uri=#{Application.fetch_env!(:shopifex, :redirect_uri)}"
conn
|> redirect(external: install_url)
|> halt()
end
defp respond_invalid(conn) do
conn
|> put_view(ShopifexWeb.AuthView)
|> put_layout({ShopifexWeb.LayoutView, "app.html"})
|> render("select-store.html")
|> halt()
end
defp get_locale(conn, token_claims \\ %{})
defp get_locale(%Plug.Conn{params: %{"locale" => locale}}, _token_claims), do: locale
defp get_locale(_conn, token_claims),
do: Map.get(token_claims, "loc", Application.get_env(:shopifex, :default_locale, "en"))
defp get_host(conn, token_claims \\ %{})
defp get_host(%Plug.Conn{params: %{"host" => host}}, _token_claims), do: host
defp get_host(_conn, token_claims),
do: Map.get(token_claims, "host")
end