impress/deploy/setup.yml

---
- name: Set up the environment for the impress app
  hosts: webserver
  become: yes
  become_user: root
  vars:
    email_address: "emi@matchu.dev" # TODO: Extract this to personal config?
    impress_hostname: impress.openneo.net
  tasks:
    - name: Create SSH folder for logged-in user
      become: no
      file:
        name: .ssh
        mode: "700"
        state: directory

    - name: Copy authorized SSH keys to logged-in user
      become: no
      copy:
        dest: ~/.ssh/authorized_keys
        src: files/authorized-ssh-keys.txt
        mode: "600"

    - name: Disable root SSH login
      lineinfile:
        dest: /etc/ssh/sshd_config
        regexp: ^#?PermitRootLogin
        line: PermitRootLogin no

    - name: Disable password-based SSH authentication
      lineinfile:
        dest: /etc/ssh/sshd_config
        regexp: ^#?PasswordAuthentication
        line: PasswordAuthentication no

    - name: Enable public-key SSH authentication
      lineinfile:
        dest: /etc/ssh/sshd_config
        regexp: ^#?PubkeyAuthentication
        line: PubkeyAuthentication yes

    - name: Update the apt cache
      apt:
        update_cache: yes

    - name: Install fail2ban firewall with default settings
      apt:
        name: fail2ban

    - name: Configure ufw firewall to allow SSH connections on port 22
      community.general.ufw:
        rule: allow
        port: "22"

    - name: Configure ufw firewall to allow HTTP connections on port 80
      community.general.ufw:
        rule: allow
        port: "80"

    - name: Configure ufw firewall to allow HTTPS connections on port 443
      community.general.ufw:
        rule: allow
        port: "443"

    - name: Enable ufw firewall with all other ports closed by default
      community.general.ufw:
        state: enabled
        policy: deny

    - name: Install unattended-upgrades
      apt:
        name: unattended-upgrades

    - name: Enable unattended-upgrades to auto-upgrade our system
      copy:
        content: |
          APT::Periodic::Update-Package-Lists "1";
          APT::Periodic::Unattended-Upgrade "1";          
        dest: /etc/apt/apt.conf.d/20auto-upgrades

    - name: Configure unattended-upgrades to auto-reboot our server when necessary
      lineinfile:
        regex: ^(//\s*)?Unattended-Upgrade::Automatic-Reboot ".*";$
        line: Unattended-Upgrade::Automatic-Reboot "true";
        dest: /etc/apt/apt.conf.d/50unattended-upgrades

    - name: Configure unattended-upgrades to delay necessary reboots to 3am
      lineinfile:
        regex: ^(//\s*)?Unattended-Upgrade::Automatic-Reboot-Time ".*";$
        line: Unattended-Upgrade::Automatic-Reboot-Time "03:00";
        dest: /etc/apt/apt.conf.d/50unattended-upgrades

    - name: Configure the system timezone to be US Pacific time
      community.general.timezone:
        name: America/Los_Angeles

    - name: Create "impress" user
      user:
        name: impress
        comment: Impress App
        home: /srv/impress
        create_home: false
        shell: /bin/bash

    - name: Create "impress-deployers" group
      group:
        name: impress-deployers

    - name: Add the current user to the "impress-deployers" group
      user:
        name: "{{ lookup('env', 'USER') }}"
        groups:
          - impress-deployers
        append: yes

    # We use this so the deploy playbook doesn't have to prompt for a root
    # password: this user just is trusted to act as "impress" in the future.
    - name: Enable the "impress-deployers" group to freely act as the "impress" user
      community.general.sudoers:
        name: impress-deployers-as-impress
        group: impress-deployers
        runas: impress
        commands: ALL
        nopassword: yes

    # Similarly, this enables us to manage the impress service in the deploy playbook
    # and in live debugging without a password.
    # NOTE: In the sudoers file, you need to specify the full path to the
    # command, to avoid tricks where you use PATH to get around the intent!
    - name: Enable the "impress-deployers" group to freely start and stop the impress service
      community.general.sudoers:
        name: impress-deployers-systemctl
        group: impress-deployers
        commands:
          - /bin/systemctl status impress
          - /bin/systemctl start impress
          - /bin/systemctl stop impress
          - /bin/systemctl restart impress
        nopassword: yes

    - name: Install ACL, to enable us to run commands as the "impress" user
      apt:
        name: acl

    - name: Install ruby-build
      git:
        repo: https://github.com/rbenv/ruby-build.git
        dest: /opt/ruby-build
        version: 4d4678bc1ed89aa6900c0ea0da23495445dbcf50

    - name: Check if Ruby 3.1.4 is already installed
      stat:
        path: /opt/ruby-3.1.4
      register: ruby_dir

    - name: Install Ruby 3.1.4
      command: "/opt/ruby-build/bin/ruby-build 3.1.4 /opt/ruby-3.1.4"
      when: not ruby_dir.stat.exists

    - name: Add Ruby 3.1.4 to the global PATH, for developer convenience
      lineinfile:
        dest: /etc/profile
        line: 'PATH="/opt/ruby-3.1.4/bin:$PATH" # Added by impress deploy setup script'

    - name: Install system dependencies for impress's Ruby gems
      apt:
        name:
          - libmysqlclient-dev
          - libyaml-dev

    - name: Create the app folder
      file:
        path: /srv/impress
        owner: impress
        group: impress
        mode: "755"
        state: directory

    - name: Add a convenient .bash_profile for when we log in as "impress"
      copy:
        owner: impress
        group: impress
        dest: /srv/impress/.bash_profile
        content: |
          set -a # Export all of the below
          RAILS_ENV=production
          EXECJS_RUNTIME=Disabled
          source /srv/impress/shared/production.env
          set +a          

    - name: Create the app's "versions" folder
      become_user: impress
      file:
        path: /srv/impress/versions
        state: directory

    - name: Create the app's "shared" folder
      become_user: impress
      file:
        path: /srv/impress/shared
        state: directory

    - name: Check for a current app version
      stat:
        path: /srv/impress/current
      register: current_app_version

    - name: Check whether we already have a placeholder app
      stat:
        path: /srv/impress/versions/initial-placeholder
      register: existing_placeholder_app
      when: not current_app_version.stat.exists

    - name: Create a placeholder app, to run until we deploy a real version
      become_user: impress
      copy:
        src: files/initial-placeholder
        dest: /srv/impress/versions
      when: |
        not current_app_version.stat.exists and
          not existing_placeholder_app.stat.exists        

    - name: Configure the placeholder app to run in deployment mode
      become_user: impress
      command:
        chdir: /srv/impress/versions/initial-placeholder
        cmd: /opt/ruby-3.1.4/bin/bundle config set --local deployment true
      when: not current_app_version.stat.exists

    - name: Install the placeholder app's dependencies
      become_user: impress
      command:
        chdir: /srv/impress/versions/initial-placeholder
        cmd: /opt/ruby-3.1.4/bin/bundle install
      when: not current_app_version.stat.exists

    - name: Set the placeholder app as the current version
      become_user: impress
      file:
        src: /srv/impress/versions/initial-placeholder
        dest: /srv/impress/current
        state: link
      when: not current_app_version.stat.exists

    # NOTE: This file is uploaded with stricter permissions, to help protect
    # the secrets inside. Most of the app is world-readable for convenience
    # for debugging and letting nginx serve static files, but keep this safer!
    - name: Upload the production.env file
      become_user: impress
      copy:
        dest: /srv/impress/shared/production.env
        src: files/production.env
        mode: "600"
      notify:
        - Reload systemctl
        - Restart impress

    - name: Create service file for impress
      copy:
        src: files/impress.service
        dest: /etc/systemd/system/impress.service  
      notify:
        - Reload systemctl
        - Restart impress

    - name: Configure impress to run now, and automatically when the system starts
      systemd:
        name: impress
        state: started
        enabled: true

    - name: Install nginx
      apt:
        name: nginx

    - name: Install core snap
      community.general.snap:
        name: core

    - name: Install certbot as a snap
      community.general.snap:
        name: certbot
        classic: yes

    - name: Set up certbot
      command: "certbot certonly --nginx -n --agree-tos --email {{ email_address }} --domains {{ impress_hostname }}"

    - name: Add impress config file to nginx
      template:
        src: files/sites-available/impress.conf
        dest: /etc/nginx/sites-available/impress.conf
      notify:
        - Restart nginx

    - name: Enable impress config file in nginx
      file:
        src: /etc/nginx/sites-available/impress.conf
        dest: /etc/nginx/sites-enabled/impress.conf
        state: link
      notify:
        - Restart nginx

  handlers:
    - name: Restart nginx
      systemd:
        name: nginx
        state: restarted

    - name: Reload systemctl
      command: systemctl daemon-reload

    - name: Restart impress
      systemd:
        name: impress
        state: restarted