matrix-docker-ansible-deploy/roles/matrix-nginx-proxy/tasks/nginx-proxy/setup_metrics_auth.yml

---

# When we're dealing with raw htpasswd content, we just store it in the file directly.
- name: Ensure matrix-metrics-htpasswd is present when generated from raw content (protecting /metrics/* URIs)
  copy:
    content: "{{ matrix_nginx_proxy_proxy_matrix_metrics_basic_auth_raw_content }}"
    dest: "{{ matrix_nginx_proxy_data_path }}/matrix-metrics-htpasswd"
    owner: "{{ matrix_user_username }}"
    group: "{{ matrix_user_groupname }}"
    mode: 0600
  when: not matrix_nginx_proxy_proxy_matrix_metrics_basic_auth_username

# Alternatively, we need to use the `htpasswd` tool to generate the htpasswd file.
# There's an Ansible module that helps with that, but it requires passlib (a Python module) to be installed on the server.
# See: https://docs.ansible.com/ansible/2.3/htpasswd_module.html#requirements-on-host-that-executes-module
# We support various distros, with various versions of Python. Installing additional Python modules can be a hassle.
# As a workaround, we run `htpasswd` from an Apache container image.
- block:
    - name: Ensure Apache Docker image is pulled for generating matrix-metrics-htpasswd from username/password (protecting /metrics/* URIs)
      docker_image:
        name: "{{ matrix_nginx_proxy_proxy_matrix_metrics_basic_auth_apache_container_image }}"
        source: "{{ 'pull' if ansible_version.major > 2 or ansible_version.minor > 7 else omit }}"
        force_source: "{{ matrix_nginx_proxy_proxy_matrix_metrics_basic_auth_apache_container_force_pull if ansible_version.major > 2 or ansible_version.minor >= 8 else omit }}"
        force: "{{ omit if ansible_version.major > 2 or ansible_version.minor >= 8 else matrix_nginx_proxy_proxy_matrix_metrics_basic_auth_apache_container_force_pull }}"
      register: result
      retries: "{{ matrix_container_retries_count }}"
      delay: "{{ matrix_container_retries_delay }}"
      until: result is not failed

    # We store the password in a file and make the `htpasswd` tool read it from there,
    # as opposed to passing it directly on stdin (which will expose it to other processes on the server).
    - name: Store metrics password in a temporary file
      copy:
        content: "{{ matrix_nginx_proxy_proxy_matrix_metrics_basic_auth_password }}"
        dest: "/tmp/matrix-nginx-proxy-metrics-password"
        mode: 0400
        owner: "{{ matrix_user_uid }}"
        group: "{{ matrix_user_gid }}"

    - name: Generate matrix-metrics-htpasswd from username/password (protecting /metrics/* URIs)
      command:
        cmd: >-
          {{ matrix_host_command_docker }} run
          --rm
          --user={{ matrix_user_uid }}:{{ matrix_user_gid }}
          --cap-drop=ALL
          --network=none
          --mount type=bind,src={{ matrix_nginx_proxy_data_path }},dst=/data
          --mount type=bind,src=/tmp/matrix-nginx-proxy-metrics-password,dst=/password,ro
          --entrypoint=/bin/sh
          {{ matrix_nginx_proxy_proxy_matrix_metrics_basic_auth_apache_container_image }}
          -c
          'cat /password | htpasswd -i -c /data/matrix-metrics-htpasswd {{ matrix_nginx_proxy_proxy_matrix_metrics_basic_auth_username }} && chmod 600 /data/matrix-metrics-htpasswd'

    - name: Delete temporary metrics password file
      file:
        path: /tmp/matrix-nginx-proxy-metrics-password
        state: absent
  when: matrix_nginx_proxy_proxy_matrix_metrics_basic_auth_username != ''