defmodule Rivet.Email do @moduledoc """ send(recips, template) send(recips, template, assigns) For each good recipient call template.format(%@email_model{}, assigns), where email.user is preloaded on %@email_model{} - `recips` can be one or list of: user id, a `user_model`, or a `email_model` - `assigns` (optional) is a dictionary with key/value attributes to use in the template Returns a tuple of :ok or :error with a list of results from each send. It will stop at the first error, however, and not continue. """ def mailer(), do: Application.get_env(:rivet_email, :mailer) defmacro __using__(opts) do quote location: :keep, bind_quoted: [opts: opts] do @user_model Keyword.get(opts, :user_model, Rivet.Ident.User) @email_model Keyword.get(opts, :email_model, Rivet.Ident.Email) @site_key Keyword.get(opts, :rivet_email_data, :rivet_email_data) @backend Keyword.get(opts, :backend) require Logger @type email_model() :: @email_model.t() @type user_model() :: @user_model.t() @type user_id() :: String.t() @type email_recipient() :: email_model() | user_model() | user_id() def send(recips, template, assigns \\ []) do with {:ok, emails} <- get_emails(recips), {:ok, assigns} <- generate_assigns(assigns) do send_all(emails, template, assigns, []) end end ########################################################################## defp send_all([recip | rest], template, assigns, out) when is_map(assigns) do case deliver(recip, template, assigns) do {:ok, result} -> send_all(rest, template, assigns, [result | out]) error -> {:error, error, [out] |> Enum.reverse()} end end defp send_all([], _, _, out), do: {:ok, Enum.reverse(out)} ########################################################################## defp generate_assigns(assigns) do assigns = Map.new(assigns) |> Map.put(:site, Application.get_env(:rivet_email, :site) |> Map.new()) case Map.get_lazy(assigns, :email_from, fn -> get_in(assigns, [:site, :email_from]) end) do nil -> {:error, ":email_from missing"} [name, email] -> {:ok, Map.put(assigns, :email_from, {name, email})} from -> {:ok, Map.put(assigns, :email_from, from)} end end ########################################################################## @spec deliver(recipient :: any(), template :: atom(), assigns :: map()) :: {:ok, Swoosh.Email.t()} | {:error, term()} def deliver(%@email_model{} = recipient, template, assigns) do assigns = Map.put(assigns, :target, recipient) case template.generate(recipient, assigns) do {:ok, subject, body} -> Swoosh.Email.new(to: recipient.address, from: assigns.email_from) |> Swoosh.Email.subject(subject) |> Swoosh.Email.html_body("#{body}") |> Swoosh.Email.text_body(Rivet.Email.Template.html2text(body)) |> send_email() {:error, "Nothing found"} -> Logger.error("Cannot send email; template missing!", template: template) other -> Logger.debug("error processing template", error: other) IO.inspect(other) {:error, :invalid_template_result} end end ########################################################################## def send_email(%Swoosh.Email{to: [{_, eaddr} = addr], subject: subj} = email) do if Application.get_env(:rivet_email, :enabled) do if String.ends_with?("@example.com", eaddr) do {:error, :example_email} else Logger.debug("sending email", to: eaddr, from: email.from, subject: subj) @backend.deliver(email) end else Logger.warn("Email disabled, not sending message to #{inspect(addr)}", subject: subj) log_email(email) {:ok, "email disabled"} end end ########################################################################## def log_email(%Swoosh.Email{} = email) do Logger.warning(""" Subject: #{email.subject} --- html #{email.html_body} --- text #{email.text_body} """) end ########################################################################## # future: assigns can include verfied: true (or some way to only send to verified addresses) @spec get_emails(email_recipient() | list(email_recipient)) :: {:ok, list(email_model())} | {:error, String.t(), term()} def get_emails(recip, out \\ []) def get_emails([recip | recips], out) do with {:ok, email} <- get_email(recip) do get_emails(recips, [email | out]) else {:error, %{reason: :no_email, user: user}} -> {:error, "Unable to load email for user, cannot send email", user: user.id} err -> {:error, "Unable to find email", err} end end def get_emails([], out), do: {:ok, out} def get_emails(recip, out), do: get_emails([recip], out) ########################################################################## @spec get_email(email_recipient()) :: {:ok, email_model()} | {:error, reason :: any()} defp get_email(%@email_model{} = email) do with {:ok, %@email_model{} = email} <- @email_model.preload(email, :user) do {:ok, email} end end # TODO: verified should be a settable option defp get_email(%@user_model{} = user) do with {:ok, %@user_model{emails: emails}} <- @user_model.preload(user, :emails) do case Enum.find(emails, fn e -> e.verified end) do %@email_model{} = email -> {:ok, %@email_model{email | user: user}} _ -> with %@email_model{} = email <- List.first(emails) do {:ok, %@email_model{email | user: user}} else _ -> {:error, :no_email} end end end end defp get_email(user_id) when is_binary(user_id) do with {:ok, user} <- @user_model.one(user_id) do get_email(user) end end end end end