add MAILGUN_BASE_URI (#2935)

* add MAILGUN_BASE_URI support

* add changelog entry

CHANGELOG.md

@@ -9,6 +9,7 @@ All notable changes to this project will be documented in this file.
 - 'Last updated X seconds ago' info to 'current visitors' tooltips
 - Add support for more Bamboo adapters, i.e. `Bamboo.MailgunAdapter`, `Bamboo.MandrillAdapter`, `Bamboo.SendGridAdapter` plausible/analytics#2649
 - Ability to change domain for existing site (requires numeric IDs data migration, instructions will be provided separately) UI + API (`PUT /api/v1/sites`)
+- Add `MAILGUN_BASE_URI` support for `Bamboo.MailgunAdapter` plausible/analytics#2935 
 
 ### Fixed
 - Fix tracker bug - call callback function even when event is ignored

config/runtime.exs

@@ -337,6 +337,10 @@ case mailer_adapter do
       api_key: get_var_from_path_or_env(config_dir, "MAILGUN_API_KEY"),
       domain: get_var_from_path_or_env(config_dir, "MAILGUN_DOMAIN")
 
+    if mailgun_base_uri = get_var_from_path_or_env(config_dir, "MAILGUN_BASE_URI") do
+      config :plausible, Plausible.Mailer, base_uri: mailgun_base_uri
+    end
+
   "Bamboo.MandrillAdapter" ->
     config :plausible, Plausible.Mailer,
       adapter: Bamboo.MandrillAdapter,

test/plausible/config_test.exs

@@ -48,6 +48,23 @@ defmodule Plausible.ConfigTest do
              ]
     end
 
+    test "Bamboo.MailgunAdapter with custom MAILGUN_BASE_URI" do
+      env = [
+        {"MAILER_ADAPTER", "Bamboo.MailgunAdapter"},
+        {"MAILGUN_API_KEY", "some-mailgun-key"},
+        {"MAILGUN_DOMAIN", "example.com"},
+        {"MAILGUN_BASE_URI", "https://api.eu.mailgun.net/v3"}
+      ]
+
+      assert get_in(runtime_config(env), [:plausible, Plausible.Mailer]) == [
+               adapter: Bamboo.MailgunAdapter,
+               hackney_opts: [recv_timeout: 10_000],
+               api_key: "some-mailgun-key",
+               domain: "example.com",
+               base_uri: "https://api.eu.mailgun.net/v3"
+             ]
+    end
+
     test "Bamboo.MandrillAdapter" do
       env = [
         {"MAILER_ADAPTER", "Bamboo.MandrillAdapter"},