Read Symfony session and check User Role

lib/my_button_app/redis.ex

@@ -1,11 +1,63 @@
 defmodule MyButtonApp.Redis do
 
   @moduledoc false
+  def is_admin(cookies) do
+    {:ok, session} = redis_session(cookies)
+    str = binary_to_str(session)
+    cond do
+      "i:0" == str -> false
+      has_admin_role(str) -> admin_info(str)
+      true -> false
+    end
+  end
+
+  defp redis_session(cookies) do
+    id = cookies["PHPSESSID"] || "__"
+    {:ok, conn} = Redix.start_link(host: "127.0.0.1", port: 6379)
+    Redix.command(conn, ["GET", "app" <> id])
+  end
+
+  defp binary_to_str(nil) do
+    "i:0"
+  end
+
   defp binary_to_str(session) do
     str = String.codepoints(session)
     arr = Enum.map(Enum.to_list(32..126), fn(n) -> <<n>> end)
     arr = arr ++ Enum.map(Enum.to_list(128..255), fn(n) -> <<n>> end)
     Enum.reduce(str, fn (w, accumulator) -> if w in arr, do: accumulator <> w, else: accumulator end)
   end
 
+  defp admin_info(str) do
+    String.split(str, "|")
+      |> Enum.at(1)
+      |> String.split("Symfony\\Component\\Security\\Core\\Role\\Role")
+      |> Enum.at(0)
+      |> String.split("Entity\\User")
+      |> Enum.at(1)
+      |> String.split(";s:")
+      |> Enum.filter(fn (line) -> line =~ "@" && line =~ "i:5"  end)
+      |> Enum.at(0)
+      |> String.split(";i:5;")
+      |> Enum.map(fn line -> String.split(line, ";i:") |> Enum.at(0) end)
+      |> Enum.map(fn line -> String.split(line, ":") |> Enum.at(1) end)
+      |> Enum.map(fn line -> String.replace(line, "\"", "") end)
+  end
+
+  defp has_admin_role(str) do
+    arr = String.split(str, "|")
+      |> Enum.at(1)
+      |> String.replace(";}_sf2_meta", ";")
+      |> String.split(";")
+      |> Enum.filter(fn (line) -> line =~ "ROLE_"  end)
+      |> Enum.map(fn line -> String.split(line, ":") |> Enum.at(2) end)
+      |> Enum.map(fn line -> String.replace(line, "\\", "") end)
+      |> Enum.map(fn line -> String.replace(line, "\"", "") end)
+    cond do
+      "ROLE_SUPER_ADMIN" in arr -> true
+      "ROLE_ADMIN" in arr -> true
+      true -> false
+    end
+  end
+
 end