Add premailer for inlining email CSS

Gemfile

@@ -27,6 +27,7 @@ gem 'countries', '~> 3.0'
 gem 'i18n-js', '~> 3.8', git: 'https://github.com/houdiniproject/i18n-js.git', branch: 'houdini-tweaks'
 gem 'lograge', '~> 0.11.2' # make logging less terrible in rails
 gem 'rails-i18n', '~> 6.0.0', '~> 6'
+gem 'premailer-rails', '~> 1.11' # for styling of email
 gem 'money', '~> 6.13'
 
 # Database and Events

Gemfile.lock

@@ -129,6 +129,8 @@ GEM
     crack (0.4.5)
       rexml
     crass (1.0.6)
+    css_parser (1.9.0)
+      addressable
     dante (0.2.0)
     database_cleaner (1.8.5)
     database_cleaner-active_record (1.8.0)
@@ -173,6 +175,7 @@ GEM
     hamster (3.0.0)
       concurrent-ruby (~> 1.0)
     hashdiff (1.0.1)
+    htmlentities (4.3.4)
     http-accept (1.7.0)
     http-cookie (1.0.3)
       domain_name (~> 0.5)
@@ -230,6 +233,13 @@ GEM
       ast (~> 2.4.1)
     pg (1.2.3)
     power_assert (1.2.0)
+    premailer (1.15.0)
+      addressable
+      css_parser (>= 1.6.0)
+      htmlentities (>= 4.0.0)
+    premailer-rails (1.11.1)
+      actionmailer (>= 3)
+      premailer (~> 1.7, >= 1.7.9)
     pry (0.12.2)
       coderay (~> 1.1.0)
       method_source (~> 0.9.0)
@@ -438,6 +448,7 @@ DEPENDENCIES
   money (~> 6.13)
   param_validation!
   pg (~> 1.1)
+  premailer-rails (~> 1.11)
   pry (~> 0.12.2)
   pry-byebug (~> 3.7.0)
   puma (~> 5.3)

NOTICE-ruby

@@ -1379,6 +1379,34 @@ OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 
+------
+
+** htmlentities; version 4.3.4 -- 
+Copyright (c) 2005-2013 Paul Battley
+
+== Licence (MIT)
+
+Copyright (c) 2005-2013 Paul Battley
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+
+
 ------
 
 ** rspec; version 3.9.0 -- 
@@ -2409,6 +2437,26 @@ TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 
+------
+
+** premailer-rails; version 1.11.1 -- 
+Copyright (c) 2011-2012 Philipe Fatio
+
+Copyright (C) 2011-2012 Philipe Fatio (fphilipe)
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated
+documentation files (the "Software"), to deal in the Software without restriction, including without limitation the
+rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit
+persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or substantial portions of
+the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
+WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
 ------
 
 ** concurrent-ruby; version 1.1.8 -- 
@@ -2814,6 +2862,8 @@ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 Copyright (c) 2005-2012 Kornelius Kalnbach <murphy@rubychan.de>
 ** crack; version 0.4.5 -- 
 Copyright (c) 2004-2008 David Heinemeier Hansson
+** css_parser; version 1.9.0 -- 
+Copyright (c) 2007-11 Alex Dunae
 ** devise; version 4.7.3 -- 
 Copyright 2009-2019 Plataformatec.
 ** http-accept; version 1.7.0 -- 

config/initializers/premailer.rb

@@ -0,0 +1,6 @@
+# frozen_string_literal: true
+
+# License: AGPL-3.0-or-later WITH Web-Template-Output-Additional-Permission-3.0-or-later
+
+# We want to keep any style attributes one elements already defined in the mailer html.
+Premailer::Rails.config.merge!(preserve_style_attribute: true)