init

lib/myapp/battle_net/auth.ex

@@ -0,0 +1,50 @@
+defmodule MyApp.BattleNet.Auth do
+  alias MyApp.BattleNet.User
+  alias MyApp.JWT
+
+  def token_uri, do: "https://us.battle.net/oauth/token"
+
+  def get_token(code) do
+    client_id = Application.get_env(:myapp, :bnet_client_id)
+    client_secret = Application.get_env(:myapp, :bnet_client_secret)
+    redirect_uri = Application.get_env(:myapp, :bnet_redirect_uri)
+
+    req_options = [hackney: [basic_auth: {client_id, client_secret}]]
+
+    HTTPoison.request(:post, token_uri, get_req_body(code), [], req_options)
+    |> parse_body
+    |> parse_token
+    |> validate_user
+    |> generate_jwt
+  end
+
+  defp parse_body({:error, err}), do: {:error, err}
+  defp parse_body({:ok, %HTTPoison.Response{body: body}}), do: Poison.decode(body)
+
+  defp parse_token({:ok, %{"access_token" => token}}), do: {:ok, token}
+  defp parse_token({:ok, %{"error" => err}}), do: {:error, err}
+  defp parse_token({:error, err}), do: {:error, "Authentication error"}
+
+  defp validate_user({:error, err}), do: {:error, err}
+  defp validate_user({:ok, token}), do: User.get_user(token)
+
+  defp generate_jwt({:error, err}), do: {:error, err}
+  defp generate_jwt({:ok, user}) do
+    case JWT.get_jwt(user, user) do
+      {:ok, token} -> {:ok, Map.merge(user, %{"token" => token})}
+      {:error, err} -> {:error, err}
+    end
+  end
+
+  defp get_req_body(code) do
+    redirect_uri = Application.get_env(:myapp, :bnet_redirect_uri)
+    {:form, [
+      grant_type: "authorization_code",
+      scope: "wow.profile",
+      code: code,
+      redirect_uri: redirect_uri,
+    ]}
+  end
+
+end
+