Introduce support for 3rd-party auth (OAuth2 & LDAP)

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

test/service/auth/mobilizon_authentificator_test.exs

@@ -0,0 +1,29 @@
+defmodule Mobilizon.Service.Auth.MobilizonAuthenticatorTest do
+  use Mobilizon.DataCase
+
+  alias Mobilizon.Service.Auth.MobilizonAuthenticator
+  alias Mobilizon.Users.User
+  import Mobilizon.Factory
+
+  setup do
+    password = "testpassword"
+    email = "someone@somewhere.tld"
+    user = insert(:user, email: email, password_hash: Argon2.hash_pwd_salt(password))
+    {:ok, [user: user, email: email, password: password]}
+  end
+
+  test "login", %{email: email, password: password, user: user} do
+    assert {:ok, %User{} = returned_user} = MobilizonAuthenticator.login(email, password)
+    assert returned_user.id == user.id
+  end
+
+  test "login with invalid password", %{email: email} do
+    assert {:error, :bad_password} == MobilizonAuthenticator.login(email, "invalid")
+    assert {:error, :bad_password} == MobilizonAuthenticator.login(email, nil)
+  end
+
+  test "login with no credentials" do
+    assert {:error, :user_not_found} == MobilizonAuthenticator.login("some@email.com", nil)
+    assert {:error, :user_not_found} == MobilizonAuthenticator.login(nil, nil)
+  end
+end