[RFE] Add support for client certificate authentication

[ansiblejunky]

SUMMARY

The Ansible Service Now Collection only supports Basic Auth and OAuth tokens, but many customers are using client certificate authentication. The only way we were able to handle this was to use the URI module and leverage the client_cert parameter. However, it meant the customer could not use the Ansible Collection and modules.

ISSUE TYPE

• Feature Idea

COMPONENT NAME

Entire Ansible Collections and modules would support (provide) a client_cert parameter for authentication.

ADDITIONAL INFORMATION

It would be used to authenticate against Service Now API. It is needed because a lot of customers use client certificate authentication instead of Basic Auth or OAuth Token methods.

Below is an example of how we accomplished the authentication using the uri module but this should also be possible using standard modules so the customer can use desired state and idempotency concepts.

- name: Create change request
  ansible.builtin.uri:
    url: "{{ servicenow_url_create }}"
    method: POST
    headers:
      Content-Type: "application/json"
    body_format: json
    body:
      assigned_to: "MANAGER123"
      business_service: "Business Group"
      service_offering: "Backup"
      u_data_center: "San Diego"
      u_impacted_lobs: "Business Lab"
      start_date: "2024-12-15 15:28:00"
      end_date: "2024-12-15 15:29:02"
      close_code: "successful"
      close_notes: "System backup for '{{ inventory_hostname }}' via Ansible Automated Standard Change"
      risk_impact_analysis: "Low"
      justification: "Backup schedule overdue"
      u_lob_field_1: "Change is Security relevant"
    validate_certs: true
    client_cert: "{{ client_cert }}"
    return_content: true
  register: auth_response