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swoosh
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Compose, deliver and test your emails easily in Elixir. Supports SMTP, Sendgrid, Mandrill, Postmark, Mailgun and many more out of the box. Preview your emails in the browser. Test your email sending code.
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Files
lib/swoosh/adapters/mailgun.ex
defmodule Swoosh.Adapters.Mailgun do
@moduledoc ~S"""
An adapter that sends email using the Mailgun API.
For reference: [Mailgun API docs](https://documentation.mailgun.com/api-sending.html#sending)
## Example
# config/config.exs
config :sample, Sample.Mailer,
adapter: Swoosh.Adapters.Mailgun,
api_key: "my-api-key",
domain: "avengers.com"
# lib/sample/mailer.ex
defmodule Sample.Mailer do
use Swoosh.Mailer, otp_app: :sample
end
"""
use Swoosh.Adapter, required_config: [:api_key, :domain]
alias Swoosh.Email
import Swoosh.Email.Render
@base_url "https://api.mailgun.net/v3"
@api_endpoint "/messages"
def deliver(%Email{} = email, config \\ []) do
headers = prepare_headers(email, config)
url = [base_url(config), "/", config[:domain], @api_endpoint]
case :hackney.post(url, headers, prepare_body(email), [:with_body]) do
{:ok, 200, _headers, body} ->
{:ok, %{id: Poison.decode!(body)["id"]}}
{:ok, 401, _headers, body} ->
{:error, {401, body}}
{:ok, code, _headers, ""} when code > 399 ->
{:error, {code, ""}}
{:ok, code, _headers, body} when code > 399 ->
{:error, {code, Poison.decode!(body)}}
{:error, reason} ->
{:error, reason}
end
end
defp base_url(config), do: config[:base_url] || @base_url
defp prepare_headers(email, config) do
[{"User-Agent", "swoosh/#{Swoosh.version}"},
{"Authorization", "Basic #{auth(config)}"},
{"Content-Type", content_type(email)}]
end
defp auth(config), do: Base.encode64("api:#{config[:api_key]}")
defp content_type(%{attachments: []}), do: "application/x-www-form-urlencoded"
defp content_type(%{}), do: "multipart/form-data"
defp prepare_body(email) do
%{}
|> prepare_from(email)
|> prepare_to(email)
|> prepare_subject(email)
|> prepare_html(email)
|> prepare_text(email)
|> prepare_cc(email)
|> prepare_bcc(email)
|> prepare_reply_to(email)
|> prepare_attachments(email)
|> prepare_custom_vars(email)
|> prepare_custom_headers(email)
|> encode_body
end
# example custom_vars
#
# %{"my_var" => %{"my_message_id": 123},
# "my_other_var" => %{"my_other_id": 1, "stuff": 2}}
defp prepare_custom_vars(body, %{provider_options: %{custom_vars: custom_vars}}) do
Enum.reduce(custom_vars, body, fn {k, v}, body -> Map.put(body, "v:#{k}", Poison.encode!(v)) end)
end
defp prepare_custom_vars(body, _email), do: body
defp prepare_custom_headers(body, %{headers: headers}) do
Enum.reduce(headers, body, fn {k, v}, body -> Map.put(body, "h:#{k}", v) end)
end
defp prepare_attachments(body, %{attachments: []}), do: body
defp prepare_attachments(body, %{attachments: attachments}) do
{normal_attachments, inline_attachments} =
Enum.split_with(attachments, fn %{type: type} -> type == :attachment end)
body
|> Map.put(:attachments, Enum.map(normal_attachments, &prepare_file(&1, "attachment")))
|> Map.put(:inline, Enum.map(inline_attachments, &prepare_file(&1, "inline")))
end
defp prepare_file(attachment, type) do
{:file, attachment.path,
{"form-data",
[{~s/"name"/, ~s/"#{type}"/},
{~s/"filename"/, ~s/"#{attachment.filename}"/}]},
[]}
end
defp prepare_from(body, %{from: from}), do: Map.put(body, :from, render_recipient(from))
defp prepare_to(body, %{to: to}), do: Map.put(body, :to, render_recipient(to))
defp prepare_reply_to(body, %{reply_to: nil}), do: body
defp prepare_reply_to(body, %{reply_to: {_name, address}}), do: Map.put(body, "h:Reply-To", address)
defp prepare_cc(body, %{cc: []}), do: body
defp prepare_cc(body, %{cc: cc}), do: Map.put(body, :cc, render_recipient(cc))
defp prepare_bcc(body, %{bcc: []}), do: body
defp prepare_bcc(body, %{bcc: bcc}), do: Map.put(body, :bcc, render_recipient(bcc))
defp prepare_subject(body, %{subject: subject}), do: Map.put(body, :subject, subject)
defp prepare_text(body, %{text_body: nil}), do: body
defp prepare_text(body, %{text_body: text_body}), do: Map.put(body, :text, text_body)
defp prepare_html(body, %{html_body: nil}), do: body
defp prepare_html(body, %{html_body: html_body}), do: Map.put(body, :html, html_body)
defp encode_body(%{attachments: attachments, inline: inline} = params) do
{:multipart,
params
|> Map.drop([:attachments, :inline])
|> Enum.map(fn {k, v} -> {to_string(k), v} end)
|> Kernel.++(attachments)
|> Kernel.++(inline)
}
end
defp encode_body(no_attachments), do: Plug.Conn.Query.encode(no_attachments)
end