From 67d012de706e13176a8e867efdd617cb2fa6fe90 Mon Sep 17 00:00:00 2001
From: Stuart Dum <stuart.dum@gmail.com>
Date: Tue, 28 Mar 2023 18:45:46 -0400
Subject: [PATCH 1/2] Move existing plugs to plugs dir

---
 lib/file_finder_web.ex                                 |  4 ++--
 lib/file_finder_web/{api/auth.ex => plugs/api.ex}      | 10 +++++-----
 .../{events/auth.ex => plugs/events.ex}                |  8 ++++----
 lib/file_finder_web/router.ex                          |  4 ++--
 4 files changed, 13 insertions(+), 13 deletions(-)
 rename lib/file_finder_web/{api/auth.ex => plugs/api.ex} (83%)
 rename lib/file_finder_web/{events/auth.ex => plugs/events.ex} (88%)

diff --git a/lib/file_finder_web.ex b/lib/file_finder_web.ex
index 452abd1..12ebcb3 100644
--- a/lib/file_finder_web.ex
+++ b/lib/file_finder_web.ex
@@ -74,8 +74,8 @@ defmodule FileFinderWeb do
       import Plug.Conn
       import Phoenix.Controller
       import Phoenix.LiveView.Router
-      import FileFinderWeb.Api.Auth, only: [authenticate_shop: 2]
-      import FileFinderWeb.Events.Auth, only: [authenticate_event: 2]
+      import FileFinderWeb.Plugs.Api, only: [authenticate_shop: 2]
+      import FileFinderWeb.Plugs.Events, only: [authenticate_event: 2]
     end
   end
 
diff --git a/lib/file_finder_web/api/auth.ex b/lib/file_finder_web/plugs/api.ex
similarity index 83%
rename from lib/file_finder_web/api/auth.ex
rename to lib/file_finder_web/plugs/api.ex
index 35f1b41..af9d3c7 100644
--- a/lib/file_finder_web/api/auth.ex
+++ b/lib/file_finder_web/plugs/api.ex
@@ -1,4 +1,4 @@
-defmodule FileFinderWeb.Api.Auth do
+defmodule FileFinderWeb.Plugs.Api do
   @moduledoc """
   A module plug that verifies the bearer token in the request headers.
   The authorization header value may look like `Bearer xxxxxxx`.
@@ -48,16 +48,16 @@ defmodule FileFinderWeb.Api.Auth do
 
   ## Examples
 
-      iex> FileFinderWeb.Api.Auth.verify_token("good-token", conn)
+      iex> FileFinderWeb.Plugs.Api.verify_token("good-token", conn)
       {:ok, 1}
 
-      iex> FileFinderWeb.Api.Auth.verify_token("bad-token", conn)
+      iex> FileFinderWeb.Plugs.Api.verify_token("bad-token", conn)
       {:error, :invalid}
 
-      iex> FileFinderWeb.Api.Auth.verify_token("old-token", conn)
+      iex> FileFinderWeb.Plugs.Api.verify_token("old-token", conn)
       {:error, :expired}
 
-      iex> FileFinderWeb.Api.Auth.verify_token(nil, conn)
+      iex> FileFinderWeb.Plugs.Api.verify_token(nil, conn)
       {:error, :missing}
 
   """
diff --git a/lib/file_finder_web/events/auth.ex b/lib/file_finder_web/plugs/events.ex
similarity index 88%
rename from lib/file_finder_web/events/auth.ex
rename to lib/file_finder_web/plugs/events.ex
index 7fd6bce..bc555c4 100644
--- a/lib/file_finder_web/events/auth.ex
+++ b/lib/file_finder_web/plugs/events.ex
@@ -1,4 +1,4 @@
-defmodule FileFinderWeb.Events.Auth do
+defmodule FileFinderWeb.Plugs.Events do
   @moduledoc """
   A module plug that verifies webhook event signatures.
   """
@@ -47,13 +47,13 @@ defmodule FileFinderWeb.Events.Auth do
 
   ## Examples
 
-      iex> FileFinderWeb.Events.Auth.verify_signature("good-signature", conn)
+      iex> FileFinderWeb.Plugs.Events.verify_signature("good-signature", conn)
       {:ok}
 
-      iex> FileFinderWeb.Events.Auth.verify_signature("bad-signature", conn)
+      iex> FileFinderWeb.Plugs.Events.verify_signature("bad-signature", conn)
       {:error, :invalid}
 
-      iex> FileFinderWeb.Events.Auth.verify_signature(nil, conn)
+      iex> FileFinderWeb.Plugs.Events.verify_signature(nil, conn)
       {:error, :missing_signature}
 
   """
diff --git a/lib/file_finder_web/router.ex b/lib/file_finder_web/router.ex
index 6f68ac9..7016dd0 100644
--- a/lib/file_finder_web/router.ex
+++ b/lib/file_finder_web/router.ex
@@ -9,7 +9,7 @@ defmodule FileFinderWeb.Router do
 
   pipeline :api do
     plug :accepts, ["json"]
-    plug FileFinderWeb.Api.Auth
+    plug FileFinderWeb.Plugs.Api
   end
 
   pipeline :browser do
@@ -23,7 +23,7 @@ defmodule FileFinderWeb.Router do
   pipeline :events do
     plug :accepts, ["json"]
     plug :put_secure_browser_headers
-    plug FileFinderWeb.Events.Auth
+    plug FileFinderWeb.Plugs.Events
   end
 
   scope "/", FileFinderWeb do

From af31e011f1b76ef0a50a71eecab7adb4b443585c Mon Sep 17 00:00:00 2001
From: Stuart Dum <stuart.dum@gmail.com>
Date: Wed, 29 Mar 2023 21:42:44 -0400
Subject: [PATCH 2/2] Add mixpanel proxy

---
 .../controllers/mixpanel_controller.ex        | 37 +++++++++++++++++++
 lib/file_finder_web/mixpanel_router.ex        | 15 ++++++++
 lib/file_finder_web/plugs/mixpanel.ex         | 24 ++++++++++++
 lib/file_finder_web/views/mixpanel_view.ex    | 11 ++++++
 4 files changed, 87 insertions(+)
 create mode 100644 lib/file_finder_web/controllers/mixpanel_controller.ex
 create mode 100644 lib/file_finder_web/mixpanel_router.ex
 create mode 100644 lib/file_finder_web/plugs/mixpanel.ex
 create mode 100644 lib/file_finder_web/views/mixpanel_view.ex

diff --git a/lib/file_finder_web/controllers/mixpanel_controller.ex b/lib/file_finder_web/controllers/mixpanel_controller.ex
new file mode 100644
index 0000000..a787221
--- /dev/null
+++ b/lib/file_finder_web/controllers/mixpanel_controller.ex
@@ -0,0 +1,37 @@
+defmodule FileFinderWeb.MixpanelController do
+  use FileFinderWeb, :controller
+
+  def lib_js(conn, _params) do
+    js = HTTPoison.get("https://cdn.mxpnl.com/libs/mixpanel-2-latest.js")
+    render("mixpanel.js", js: js)
+  end
+
+  def lib_min_js(conn, _params) do
+    js = HTTPoison.get("https://cdn.mxpnl.com/libs/mixpanel-2-latest.min.js")
+    render("mixpanel.js", js: js)
+  end
+
+  def request(conn, _params) do
+    url =
+      if conn.path_info |> List.first() == "decide" do
+        "https://decide.mixpanel.com"
+      else
+        "https://api.mixpanel.com"
+      end
+
+    ip =
+      cond do
+        get_req_header(conn, "x-forwarded-for") |> length() > 0 ->
+          get_resp_header(conn, "x-forwarded-for") |> List.first()
+
+        get_req_header(conn, "x-real-ip") |> length() > 0 ->
+          get_req_header(conn, "x-real-ip") |> List.first()
+
+        true ->
+          # TODO: format
+          conn.remote_ip
+      end
+
+    render("mixpanel.json", json: %{debug: "TODO"})
+  end
+end
diff --git a/lib/file_finder_web/mixpanel_router.ex b/lib/file_finder_web/mixpanel_router.ex
new file mode 100644
index 0000000..a1d3241
--- /dev/null
+++ b/lib/file_finder_web/mixpanel_router.ex
@@ -0,0 +1,15 @@
+defmodule FileFinderWeb.MixpanelRouter do
+  use FileFinderWeb, :router
+
+  pipeline :proxy do
+    plug :accepts, ["js", "json"]
+  end
+
+  scope "/", FileFinderWeb do
+    pipe_through :proxy
+
+    get "/lib.js", MixpanelController, :lib_js
+    get "/lib.min.js", MixpanelController, :lib_min_js
+    get "/*path", MixpanelController, :api_request
+  end
+end
diff --git a/lib/file_finder_web/plugs/mixpanel.ex b/lib/file_finder_web/plugs/mixpanel.ex
new file mode 100644
index 0000000..41b3bc4
--- /dev/null
+++ b/lib/file_finder_web/plugs/mixpanel.ex
@@ -0,0 +1,24 @@
+defmodule FileFinderWeb.Plugs.Mixpanel do
+  import Plug.Conn
+
+  @doc false
+  def init(default), do: default
+
+  @doc false
+  def call(conn, router) do
+    case get_subdomain(conn.host) do
+      subdomain when subdomain == "mixpanel" ->
+        conn
+        |> router.call(router.init({}))
+        |> halt()
+
+      _ ->
+        conn
+    end
+  end
+
+  defp get_subdomain(host) do
+    root_host = Subdomainer.Endpoint.config(:url)[:host]
+    String.replace(host, ~r/.?#{root_host}/, "")
+  end
+end
diff --git a/lib/file_finder_web/views/mixpanel_view.ex b/lib/file_finder_web/views/mixpanel_view.ex
new file mode 100644
index 0000000..f5aa465
--- /dev/null
+++ b/lib/file_finder_web/views/mixpanel_view.ex
@@ -0,0 +1,11 @@
+defmodule FileFinderWeb.MixpanelView do
+  use FileFinderWeb, :view
+
+  def render("mixpanel.js", %{js: js}) do
+    js
+  end
+
+  def render("mixpanel.json", %{json: json}) do
+    json
+  end
+end