Add support file

This support file is from the mu-elixir-template and should be replaced
by integrating the template in here.

Author: Jan-PieterBaert

lib/support.ex

@@ -0,0 +1,62 @@
+defmodule Support do
+  # environment variables
+  def sparql_endpoint() do
+    System.get_env("MU_SPARQL_ENDPOINT")
+  end
+  def application_graph() do
+    System.get_env("MU_APPLICATION_GRAPH")
+  end
+  def sparql_timeout() do
+    System.get_env("MU_SPARQL_TIMEOUT")
+  end
+  def log_level() do
+    System.get_env("LOG_LEVEL")
+  end
+
+  # uuid helper
+  def generate_uuid() do
+    UUID.uuid4()
+  end
+
+  # graph helper
+  def graph() do
+    application_graph()
+  end
+
+  # query helper
+  def _query_get_URL(escaped_query_string) do
+    if sparql_timeout() > 0 do
+      "#{sparql_endpoint()}?query=#{escaped_query_string}&timeout=#{sparql_timeout()}"
+    else
+      "#{sparql_endpoint()}?query=#{escaped_query_string}"
+    end
+  end
+
+  def query(query_string) do
+    query_string
+    |> URI.encode
+    |> _query_get_URL
+    |> HTTPoison.get!([{"Accept", "application/json"}])
+    |> ( &( &1.body ) ).()
+    |> Poison.decode!
+  end
+
+  def update(query_string) do
+    HTTPoison.post!(
+      sparql_endpoint(),
+      [
+        "query=" <>
+        URI.encode_www_form(query_string) <>
+        "&format=" <> URI.encode_www_form("application/sparql-results+json")
+      ],
+      ["Content-Type": "application/x-www-form-urlencoded"],
+      []
+    )
+    |> ( &( &1.body ) ).()
+    |> Poison.decode!
+  end
+
+  def sparql_escape(value) do
+    String.replace(value, "\"", "\\\"")
+  end
+end

mix.exs

@@ -48,7 +48,9 @@ defmodule UsePlugProxy.Mixfile do
       {:plug_cowboy, "~> 2.4.1"},
       {:dialyxir, "~> 1.0", only: [:dev], runtime: false},
       {:credo, "~> 1.5", only: [:dev, :test], runtime: false},
-      {:poison, "~> 2.0"}
+      {:poison, "~> 2.0"},
+      {:uuid, "~> 1.1"},
+      {:httpoison, "~> 1.5"}
     ]
   end
 end