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The following Playbook uses the API to receive a list of available extensions/bindings, and then installs a number of extensions if they are not yet installed. Additionally a new filter "byattr" filter is required, based on this solution here. In my case I did not use "filter_plugins/core.py" but instead placed the plugin in "filter_plugins/byattr.py".

- name: Install required packages
  apt: name={{ item }} state=present
  with_items:
    - python-jinja2
    - python-jinja2-time
    - jq
    - curl


- name: Get list of available and installed extensions
  uri:
    url: "http://{{ ansible_host }}:8080/rest/extensions"
  register: oh2_extensions
  changed_when: false


#- name: List extensions
#  debug:
#    msg: "{{ oh2_extensions.json }}"


#- name: List extensions
#  debug:
#    msg: "{{ item.id }}"
#  loop: "{{ oh2_extensions.json }}"


- name: Install extensions
  uri:
    url: "http://{{ ansible_host }}:8080/rest/extensions/{{ item }}/install"
    method: POST
  when: "not (oh2_extensions.json|byattr('id', item))[0].installed"
  with_items:
    - binding-chromecast
    - binding-logreader
    - binding-network
    - binding-yahooweather
    - binding-ipp
    - binding-feed
    - binding-exec
    - binding-astro
  register: oh2_install_extensions

The first "debug" statement dumps the entire extension list including all the other data. The second "debug" just dumps a list of available extensions, making it somewhat easier to read. Both debug options are commented out, but left there for convenience.

This Playbook installs a few additional packages, mainly jinja2 templates which are not preinstalled on the openHABian image, and a small tool named "jq" which I'm not directly using with Ansible, but in combination with "curl" to debug the API JSON output:

curl -s -X GET --header "Accept: application/json" "http://127.0.0.1:8080/rest/things" | jq '.' | less

The "curl" line above fetches all available "things" from openHAB, pretty prints the output and lists everything in "less".

Now that all extensions are installed, it's time to rescan and rediscover new inbox items. Again that's possible using the API:

- block:
  - name: Get list of discoveries
    uri:
      url: "http://{{ ansible_host }}:8080/rest/discovery"
    register: oh2_discoveries
    changed_when: false


#  - name: List discoveries
#    debug:
#      msg: "{{ oh2_discoveries }}"


  - name: Rediscover
    uri:
      url: "{{ oh2_discoveries.url }}/bindings/{{ item }}/scan"
      method: POST
    loop: "{{ oh2_discoveries.json }}"

  when: oh2_install_extensions.changed

Fetch a list of all available discoveries, and then force openHAB to rediscover all of them - just in case. That's all wrapped in a block, and only run if the list of extensions changed. Otherwise it's not necessary to rediscover items.