---
# ---------------------------------------------------------------------------
# TLS certificate lifecycle via lego (ACME DNS-01 against Cloudflare).
#
# This file only READS the Cloudflare token from elk_cloudflare_token_env_file.
# It never receives the token as an Ansible variable - the token is expected
# to already exist on disk (root:root, 0600), placed there by cloud-init at
# provisioning time. See the role README for the IaC side of this.
# ---------------------------------------------------------------------------

- name: Check if Cloudflare token file exists at legacy/staging path
  ansible.builtin.stat:
    path: /etc/retailor/cloudflare-token.env
  register: elk_cf_token_src_stat

- name: Ensure folder exists
  ansible.builtin.command:
    cmd: mkdir -p "{{ elk_lego_path }}"
  when: elk_cf_token_src_stat.stat.exists
  changed_when: true

- name: Move Cloudflare token file into place if found at staging path
  ansible.builtin.command:
    cmd: cp /etc/retailor/cloudflare-token.env "{{ elk_cloudflare_token_env_file }}"
  when: elk_cf_token_src_stat.stat.exists
  changed_when: true

- name: Assert the Cloudflare token file exists at the expected location
  ansible.builtin.stat:
    path: "{{ elk_cloudflare_token_env_file }}"
  register: elk_cf_token_stat

- name: Fail early with a clear message if the token file is missing
  ansible.builtin.fail:
    msg: >
      {{ elk_cloudflare_token_env_file }} does not exist. This role expects
      cloud-init (or equivalent provisioning) to have already written a
      scoped Cloudflare API token here before Ansible runs, or a legacy
      copy at /etc/retailor/cloudflare-token.env to be moved into place. See the
      IaC notes in the role README.
  when: not elk_cf_token_stat.stat.exists

- name: Ensure the token file has correct ownership and permissions
  ansible.builtin.file:
    path: "{{ elk_cloudflare_token_env_file }}"
    mode: "0640"
    owner: root
    group: root
  when: elk_cf_token_stat.stat.exists

- name: Re-stat token file after permission enforcement
  ansible.builtin.stat:
    path: "{{ elk_cloudflare_token_env_file }}"
  register: elk_cf_token_stat

- name: Verify the token file is not world readable
  ansible.builtin.assert:
    that:
      - elk_cf_token_stat.stat.mode == "0640"
    fail_msg: >
      {{ elk_cloudflare_token_env_file }} should be mode 0640
      (currently {{ elk_cf_token_stat.stat.mode }}) since it holds a
      Cloudflare API credential.
    success_msg: "Cloudflare token file permissions verified."

- name: Create lego directories
  ansible.builtin.file:
    path: "{{ item }}"
    state: directory
    owner: root
    group: root
    mode: "0700"
  loop:
    - "{{ elk_lego_path }}"
    - "{{ elk_lego_path }}/accounts"

- name: Create lego certificates directory (traversable by container users)
  ansible.builtin.file:
    path: "{{ elk_lego_certs_dir }}"
    state: directory
    owner: root
    group: root
    mode: "0755"

- name: Check installed lego version (if any)
  ansible.builtin.command: "{{ elk_lego_install_dir }}/lego --version"
  register: elk_lego_installed_version
  changed_when: false
  failed_when: false

- name: Download and install lego binary
  when: >
    elk_lego_installed_version.rc != 0 or
    elk_lego_version not in (elk_lego_installed_version.stdout | default(''))
  block:
    - name: Download lego release tarball
      ansible.builtin.get_url:
        url: "https://github.com/go-acme/lego/releases/download/v{{ elk_lego_version }}/lego_v{{ elk_lego_version }}_linux_{{ elk_lego_arch }}.tar.gz"
        dest: "/tmp/lego_{{ elk_lego_version }}.tar.gz"
        mode: "0644"

    - name: Extract lego binary
      ansible.builtin.unarchive:
        src: "/tmp/lego_{{ elk_lego_version }}.tar.gz"
        dest: /tmp
        remote_src: true
        include:
          - lego

    - name: Install lego binary
      ansible.builtin.copy:
        src: /tmp/lego
        dest: "{{ elk_lego_install_dir }}/lego"
        owner: root
        group: root
        mode: "0755"
        remote_src: true

    - name: Clean up downloaded artifacts
      ansible.builtin.file:
        path: "{{ item }}"
        state: absent
      loop:
        - "/tmp/lego_{{ elk_lego_version }}.tar.gz"
        - /tmp/lego

- name: Check whether a certificate already exists for this domain
  ansible.builtin.stat:
    path: "{{ elk_lego_certs_dir }}/{{ elk_tls_domain }}.crt"
  register: elk_cert_stat

# First issuance uses `lego ... run`, which is what actually requests a new
# certificate; `renew` (used by the systemd timer below) refuses to run
# against a domain with no existing certificate.
- name: Issue the initial certificate (first run only)
  ansible.builtin.shell: |
    set -o pipefail
    export $(cat "{{ elk_cloudflare_token_env_file}}" | xargs) && \
    {{ elk_lego_install_dir }}/lego \
      --accept-tos \
      --email "{{ elk_tls_acme_email }}" \
      --server "{{ elk_tls_acme_server }}" \
      --domains "{{ elk_tls_domain }}" \
      --dns cloudflare \
      --dns.resolvers "1.1.1.1:53,8.8.8.8:53" \
      --path "{{ elk_lego_path }}" \
      run
  args:
    executable: /bin/bash
  when: not elk_cert_stat.stat.exists
  register: elk_lego_first_issue
  notify: "restart elk stack"

- name: Ensure issued cert/key are readable by the containers (root-owned, group-readable)
  ansible.builtin.file:
    path: "{{ item }}"
    owner: root
    group: root
    mode: "0644"
  loop:
    - "{{ elk_lego_certs_dir }}/{{ elk_tls_domain }}.crt"
    - "{{ elk_lego_certs_dir }}/{{ elk_tls_domain }}.issuer.crt"
  when: elk_cert_stat.stat.exists or elk_lego_first_issue is not skipped

- name: Private key stays root-only-readable but group-readable for the container runtime
  ansible.builtin.file:
    path: "{{ elk_lego_certs_dir }}/{{ elk_tls_domain }}.key"
    owner: root
    group: root
    mode: "0640"
  when: elk_cert_stat.stat.exists or elk_lego_first_issue is not skipped

# ---------------------------------------------------------------------------
# Ongoing renewal: systemd oneshot service + daily timer. lego's `renew`
# subcommand only actually re-issues (and only then fires --run-hook) when
# the certificate is within elk_tls_renew_days of expiring, so this is safe
# to run daily without causing unnecessary container restarts.
# ---------------------------------------------------------------------------
- name: Template lego renewal systemd service
  ansible.builtin.template:
    src: lego-renew.service.j2
    dest: /etc/systemd/system/lego-renew.service
    owner: root
    group: root
    mode: "0644"
  register: elk_lego_service_unit

- name: Template lego renewal systemd timer
  ansible.builtin.template:
    src: lego-renew.timer.j2
    dest: /etc/systemd/system/lego-renew.timer
    owner: root
    group: root
    mode: "0644"
  register: elk_lego_timer_unit

- name: Reload systemd if units changed
  ansible.builtin.systemd:
    daemon_reload: true
  when: elk_lego_service_unit is changed or elk_lego_timer_unit is changed

- name: Enable and start the lego renewal timer
  ansible.builtin.systemd:
    name: lego-renew.timer
    enabled: true
    state: started