MrTin · March 13, 2016 00:44 · Aug 16, 2014
diff --git a/Elixir Email Validation b/Elixir Email Validation
@@ -0,0 +1,29 @@
+  defmodule EmailValidator do
+
+    # ensure that the email looks valid
+    def validate_email(email) when is_binary(email) do
+      case Regex.run(~r/^[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,4}$/, email) do
+        nil ->
+          {:error, "Invalid email"}
+        [email] ->
+          try do
+            Regex.run(~r/(\w+)@([\w.]+)/, email) |> validate_email
+          rescue
+            _ -> {:error, "Invalid email"}
+          end
+      end
+    end
+
+    # check the email against a list of accepted domains, then make check if it is unique
+    def validate_email([email, username, host]) do
+      case host in Config.accepted_domains do
+        true ->
+          case find_by_email(email) do
+              nil -> :ok
+              _account -> :account
+          end
+        _ ->
+          {:error, "Not an accepted domain."}
+      end
+    end
+  end
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