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lib/email/index.ex
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("<html><body>#{body}</body></html>")
|> 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.warning("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