service object to write out config files

_vsftpd/ftpd.passwd

@@ -0,0 +1,3 @@
+client-two:$1$Uoqdsd1f$A39luV6N91OtA/VvcdBfC0
+client-one:$1$cVA6ZMIU$K/ITsDMZWeEDFEvoWk0op.
+client-three:$1$pGYnsuhu$3MPEsgikbEhX1mZQE/qDc/

_vsftpd/users/client-one

@@ -0,0 +1 @@
+local_root=_vsftpd/root/client_one

_vsftpd/users/client-three

@@ -0,0 +1 @@
+local_root=_vsftpd/root/client_three

_vsftpd/users/client-two

@@ -0,0 +1 @@
+local_root=_vsftpd/root/client_two

app/services/ftp_config.rb

@@ -0,0 +1,36 @@
+# frozen_string_literal: true
+class FtpConfig
+  def build_password_list accounts
+    File.open(password_file, "w+") do |file|
+      Array(accounts).each do |account|
+        file.write "#{account.username}:#{hash_password(account.password)}"
+      end
+    end
+  end
+
+  def build_user_configs accounts
+    Array(accounts).each do |account|
+      File.open("#{config_path}#{account.username}", "w+") do |file|
+        file.write "local_root=#{ftp_root}#{account.home_folder}"
+      end
+    end
+  end
+
+  private
+
+    def password_file
+      AppConfig.htpasswd
+    end
+
+    def config_path
+      AppConfig.ftpusers
+    end
+
+    def ftp_root
+      AppConfig.ftproot
+    end
+
+    def hash_password password
+      `openssl passwd -1 -noverify -quiet #{password}`
+    end
+end

config/application.yml.sample

@@ -10,6 +10,9 @@ defaults: &defaults
   client_key: client-id
   secret_key: client-secret
   callback_url: local-callback
+  htpasswd: "/path/to/vsftpd/password.file"
+  ftpusers: "/path/to/vsftpd/users/configs"
+  ftproot: "/path/to/root/ftp/prefix/"
 
 development:
   <<: *defaults

test/fixtures/accounts.yml

@@ -5,3 +5,15 @@ account1:
   password: <%= CryptSerializer.dump('1q2w3e4r5t6y7u') %>
   home_folder: client_one
   contact_email: ftp-user@mailinator.com
+
+account2:
+  username: client-two
+  password: <%= CryptSerializer.dump('azsxdcfvgbhnjmk,l.;/') %>
+  home_folder: client_two
+  contact_email: ftp-user@mailinator.com
+
+account3:
+  username: client-three
+  password: <%= CryptSerializer.dump('p0o9i8u7y6t5r4e3w2q1') %>
+  home_folder: client_three
+  contact_email: ftp-user@mailinator.com

test/services/ftp_config_test.rb

@@ -0,0 +1,21 @@
+# frozen_string_literal: true
+require 'test_helper'
+
+class FtpConfigTest < ActiveSupport::TestCase
+  test 'should write new password file' do
+    config = FtpConfig.new
+    config.build_password_list Account.all
+
+    assert_match "#{accounts(:account2).username}:", File.read(AppConfig.htpasswd)
+  end
+
+  test 'should build user config files' do
+    config = FtpConfig.new
+    config.build_user_configs Account.all
+
+    account = accounts(:account1)
+    fconfig = File.read("#{AppConfig.ftpusers}#{account.username}")
+
+    assert_match account.home_folder, fconfig
+  end
+end