rougail/docs/tutorial/domainname.rst

A few types suitable for our use case
================================================

.. objectives:: Objectives

   There isn't just the `string` or `integer` type, there are basic types 
   that are much more suited to our use case, such as `domainname`, `port`, and `boolean`.

.. prerequisites:: Prerequisites

    - We assume that Rougail's library is :ref:`installed <installation>` on your computer.

    - It is possible to retrieve the current state of the various rougail files manipulated in this tutorial step
      by checking out the corresponding tag of the Rougail-tutorials git repository.
      Each tag corresponds to a stage of progress in the tutorial.
      Of course, you can also decide to copy/paste or download the tutorial files contents while following the tutorial steps.

    If you want to follow this tutorial with the help of the corresponding :tutorial:`Rougail-tutorials git repository <src/branch/1.1>`, 
    this workshop page corresponds to the tags :tutorial:`v1.1_030 <src/tag/v1.1_030>` to :tutorial:`v1.1_033 <src/tag/v1.1_033>` 
    in the repository.

    ::
   
       git clone https://forge.cloud.silique.fr/stove/rougail-tutorials.git
       git checkout v1.1_030

.. type-along:: let's recap how far we've come

We have an `http_proxy` family with an `address` variable in it.

.. extinclude:: https://forge.cloud.silique.fr/stove/rougail-tutorials/raw/tag/v1.1_030/firefox/10-manual.yml
   :language: yaml
   :caption: An `address` variable in the `http_proxy` family

.. 
    manual:  # Manual proxy configuration
      http_proxy:  # HTTP Proxy
        address:
          description: HTTP address
          type: domainname

:tutorial:`Download this file from the rougail-tutorials git repository <src/tag/v1.1_030/firefox/10-manual.yml>`

A variable with type `domainname`
-----------------------------------

Notice that we have assigned a type to this variable:

.. code-block:: yaml
   :linenos:
   :caption: The `address` variable with the `domainname` type assigned
   
    address:
      type: domainname

Assigning a type is convenient for reading, but what else does it bring?

Well, with a correct user data like this one,

.. extinclude:: https://forge.cloud.silique.fr/stove/rougail-tutorials/raw/tag/v1.1_030/config/01/config.yml
   :language: yaml
   :caption: A domain name user data setting

.. 
    ---
    manual:
      http_proxy:
        address: net.example

:tutorial:`Download this file from the rougail-tutorials git repository <src/tag/v1.1_030/config/01/config.yml>`

if we launch the rougail CLI on it:

.. raw:: html
   :url: https://forge.cloud.silique.fr/stove/rougail-tutorials/raw/tag/v1.1_030/config/01/cmd_ro.txt
   :class: terminal

..
    rougail -m firefox/ -u yaml -yf config/01/config.yml

We have this output: 

.. raw:: html
   :url: https://forge.cloud.silique.fr/stove/rougail-tutorials/raw/tag/v1.1_030/config/01/output_ro.html
   :class: output
.. 
    <pre>╭──────── Caption ────────╮
    │ Variable <span style="color: #ffd700">Default value</span>  │
    │          <span style="color: #00aa00">Modified value</span> │
    ╰─────────────────────────╯
    Variables:
    <span style="color: #5c5cff">┣━━ </span>📓 Configure Proxy Access to the Internet: <span style="color: #ffd700">No proxy</span>
    <span style="color: #5c5cff">┗━━ </span>📂 Manual proxy configuration
    <span style="color: #5c5cff">    </span><span style="color: #5c5cff">┗━━ </span>📂 HTTP Proxy
    <span style="color: #5c5cff">    </span><span style="color: #5c5cff">    </span><span style="color: #5c5cff">┗━━ </span>📓 HTTP address: <span style="color: #00aa00">example.net</span> ◀ loaded from the YAML file 
    <span style="color: #5c5cff">    </span><span style="color: #5c5cff">    </span><span style="color: #5c5cff">    </span>"config/01/config.yml"
    </pre>


And we don't really see any change associated with the fact that we have assigned
a type to this variable. But if we assign this (wrong) user data:

.. type-along:: A domain name has no space in it

Let's have a look at an example of user setting that does not fit the 
`domainname` type:

.. extinclude:: https://forge.cloud.silique.fr/stove/rougail-tutorials/raw/tag/v1.1_030/config/03/config.yml
   :language: yaml
   :caption: An invalid domain name for the :file:`config/03/config.yml` user data setting

.. 
    ---
    manual:
      http_proxy:
        address: bla bla

:tutorial:`Download this file from the rougail-tutorials git repository <src/tag/v1.1_030/config/03/config.yml>`

The value is obviously not a domain name, then when we will launch the rougail CLI:

.. raw:: html
   :url: https://forge.cloud.silique.fr/stove/rougail-tutorials/raw/tag/v1.1_030/config/03/cmd_invalid.txt
   :class: terminal

..
    rougail -m firefox/ -u yaml -yf config/03/config.yml --cli.invalid_user_datas_error

we then have this output:

.. raw:: html
   :url: https://forge.cloud.silique.fr/stove/rougail-tutorials/raw/tag/v1.1_030/config/03/output_invalid.html
   :class: error
   
.. 
    <pre><span style="font-weight: bold; color: #ff0000">🛑 ERRORS</span>
    <span style="color: #ff0000">┗━━ </span>the value "bla bla" is an invalid domain name for 
    <span style="color: #ff0000">    </span>"manual.http_proxy.address" (HTTP address), must not be an IP, it will be 
    <span style="color: #ff0000">    </span>ignored when loading from the YAML file "config/02/config.yml"
    </pre>

.. type-along:: what if we set an IP address instead of a domain name?

.. extinclude:: https://forge.cloud.silique.fr/stove/rougail-tutorials/raw/tag/v1.1_030/config/02/config.yml
   :language: yaml
   :caption: A domain name in the :file:`config/02/config.yml` user data setting with an IP address

.. 
    ---
    manual:
      http_proxy:
        address: 19.168.230.51

:tutorial:`Download this file from the rougail-tutorials git repository <src/tag/v1.1_030/config/02/config.yml>`

With a value that *is not a domain name* but an IP address, then when we will launch the rougail CLI 
we will see a little problem:

.. raw:: html
   :url: https://forge.cloud.silique.fr/stove/rougail-tutorials/raw/tag/v1.1_030/config/02/cmd_invalid.txt
   :class: terminal

..
    rougail -m firefox/ -u yaml -yf config/02/config.yml --cli.invalid_user_datas_error

we then have this output:

.. raw:: html
   :url: https://forge.cloud.silique.fr/stove/rougail-tutorials/raw/tag/v1.1_030/config/02/output_invalid.html
   :class: error
   
.. 
    <pre><span style="font-weight: bold; color: #ff0000">🛑 ERRORS</span>
    <span style="color: #ff0000">┗━━ </span>the value "192.168.0.1" is an invalid domain name for 
    <span style="color: #ff0000">    </span>"manual.http_proxy.address" (HTTP address), must not be an IP, it will be 
    <span style="color: #ff0000">    </span>ignored when loading from the YAML file "config/02/config.yml"
    </pre>

We observe that an error has been raised because an IP address is not a domain name. 
Therefore, a type validation is taking place because we declared the type `domainname`.

.. type-along:: A variable with type's parameters

.. questions:: Question

   OK I agree with the `domainname` necessary type validation, but what if I want to specify 
   an IP address as a user value for this `address` variable?
   Because it is therefore simply impossible to do so now.
   
   Is there a way for my `address` variable to accept an IP address?

Well, it is possible to configure the type so that it accepts IP addresses.
We need to specify whether our variable accepts to be filled using an IP or a domain name only.
This is where the ability to parameterize our variable comes in.

.. rubric:: Let's add a type parameter.

.. type-along:: For those who follow the tutorial with the help of the git repository

    Now you need to checkout the `v1.1_031` version::
     
          git checkout v1.1_031

Let's add a type parameter named `allow_ip`:

.. extinclude:: https://forge.cloud.silique.fr/stove/rougail-tutorials/raw/tag/v1.1_031/firefox/10-manual.yml
   :language: yaml
   :caption: The `allow_ip` type parameter set in the :file:`firefox/10-manual.yml` structure file
   :linenos:
..
    ---
    manual:
      description: Manual proxy configuration

      http_proxy:
        description: HTTP Proxy

        address:
          description: HTTP address
          type: domainname
          params:
            allow_ip: true

The params allow the domain name `address` variable to be set with IPs. 

.. glossary::

   parameter
   
       A parameter is a property of a variable that can refine its behavior. 
       It is declared by adding the `params` attribute in the variable's 
       definition.

Now we will test with an IP address as the value for our `address` variable.

.. extinclude:: https://forge.cloud.silique.fr/stove/rougail-tutorials/raw/tag/v1.1_031/config/02/config.yml
   :language: yaml
   :caption: An IP address as a value in the :file:`config/02/config.yml` user value

.. 
    ---
    manual:
      http_proxy:
        address: 192.168.0.1

:tutorial:`Download this file from the rougail-tutorials git repository <src/tag/v1.1_031/config/02/config.yml>`

if we launch the rougail CLI on it:

.. raw:: html
   :url: https://forge.cloud.silique.fr/stove/rougail-tutorials/raw/tag/v1.1_031/config/02/cmd_ro.txt
   :class: terminal

..
    rougail -m firefox/ -u yaml -yf config/02/config.yml

We have this output: 

.. raw:: html
   :url: https://forge.cloud.silique.fr/stove/rougail-tutorials/raw/tag/v1.1_031/config/02/output_ro.html
   :class: output

We can see that the IP address value has been accepted.

A variable with type `port`
------------------------------

.. type-along:: For those who follow the tutorial with the help of the git repository

    Now you need to checkout the `v1.1_032` version::
     
          git checkout v1.1_032


After the `address` variable let's add, according to our use case,

.. image:: images/firefox_port.png

a new variable of type `port`. Our structure file looks like this:

.. extinclude:: https://forge.cloud.silique.fr/stove/rougail-tutorials/raw/tag/v1.1_032/firefox/10-manual.yml
   :language: yaml
   :caption: The `port` type variable in the :file:`firefox/10-manual.yml` structure file
   :linenos:
..
    port:
      description: HTTP Port
      type: port
      default: 8080

:tutorial:`Download this file from the rougail-tutorials git repository <src/tag/v1.1_032/firefox/10-manual.yml>`

Let's assing a value to this port: 

.. extinclude:: https://forge.cloud.silique.fr/stove/rougail-tutorials/raw/commit/v1.1_032/config/02/config.yml
   :language: yaml
   :caption: A user data :file:`config/02/config.yml` setting a value to the port variable

.. 
    proxy_mode: Manual proxy configuration
    manual:
      http_proxy:
        address: example.net
        port: 3128
        
:tutorial:`Download this file from the rougail-tutorials git repository <src/tag/v1.1_032/config/02/config.yml>`

If we launch the rougail CLI: 

.. raw:: html
   :class: terminal
   :url: https://forge.cloud.silique.fr/stove/rougail-tutorials/raw/commit/v1.1_032/config/02/cmd_ro.txt

We have this output: 

.. raw:: html
   :class: output
   :url: https://forge.cloud.silique.fr/stove/rougail-tutorials/raw/commit/v1.1_032/config/02/output_ro.html
   
..
    <pre>╭─────────────────────────── Caption ────────────────────────────╮
    │ Variable                           <span style="color: #00aa00">Modified value</span>              │
    │ <span style="color: #ff0000">Undocumented but modified variable</span> (⏳ Original default value) │
    ╰────────────────────────────────────────────────────────────────╯
    Variables:
    <span style="color: #5c5cff">┣━━ </span>📓 <span style="color: #ff0000">Configure Proxy Access to the Internet</span>: <span style="color: #00aa00">Manual proxy configuration</span> ◀ 
    <span style="color: #5c5cff">┃   </span>loaded from the YAML file "config/02/config.yml" (⏳ No proxy)
    <span style="color: #5c5cff">┗━━ </span>📂 Manual proxy configuration
    <span style="color: #5c5cff">    </span><span style="color: #5c5cff">┗━━ </span>📂 HTTP Proxy
    <span style="color: #5c5cff">    </span><span style="color: #5c5cff">    </span><span style="color: #5c5cff">┣━━ </span>📓 <span style="color: #ff0000">HTTP address</span>: <span style="color: #00aa00">example.net</span> ◀ loaded from the YAML file 
    <span style="color: #5c5cff">    </span><span style="color: #5c5cff">    </span><span style="color: #5c5cff">┃   </span>"config/02/config.yml"
    <span style="color: #5c5cff">    </span><span style="color: #5c5cff">    </span><span style="color: #5c5cff">┗━━ </span>📓 <span style="color: #ff0000">HTTP Port</span>: <span style="color: #00aa00">3128</span> ◀ loaded from the YAML file 
    <span style="color: #5c5cff">    </span><span style="color: #5c5cff">    </span><span style="color: #5c5cff">    </span>"config/02/config.yml" (⏳ 8080)
    </pre>
   
How can we know what validations the port type performs on the value assigned to the variable?

There are a number of validations that are carried out with this `port` type:

- well-known ports (1 to 1023) are allowed
- registred ports (1024 to 49151) are allowed

.. - private ports (greater than 49152) are allowed

Now let's assign a value that is outside the allowed ports:

.. extinclude:: https://forge.cloud.silique.fr/stove/rougail-tutorials/raw/commit/v1.1_032/config/03/config.yml
   :language: yaml 
   :caption: A user value in :file:`config/03/config.yml` that is not allowed

:tutorial:`Download this file from the rougail-tutorials git repository <src/tag/v1.1_032/config/03/config.yml>`

Again, we launch the rougail CLI:

.. raw:: html
   :class: terminal
   :url: https://forge.cloud.silique.fr/stove/rougail-tutorials/raw/commit/v1.1_032/config/03/cmd_invalid.txt
   
.. rougail -m firefox/ -u yaml -yf config/03/config.yml --cli.invalid_user_datas_error

And we have this output:    

.. raw:: html
   :class: error
   :url: https://forge.cloud.silique.fr/stove/rougail-tutorials/raw/commit/v1.1_032/config/03/output_invalid.html

.. 
    <pre><span style="font-weight: bold; color: #ff0000">🛑 ERRORS</span>
    <span style="color: #ff0000">┗━━ </span>the value "100000" is an invalid port for "manual.http_proxy.port" (HTTP 
    <span style="color: #ff0000">    </span>Port), must be between 1 and 65535, it will be ignored when loading from the
    <span style="color: #ff0000">    </span>YAML file "config/03/config.yml"
    </pre>
   
We observe that, as with the `domainname` type, a number of validations are performed 
to ensure that the value assigned to this variable conforms to the `port` type.
   
A variable with type `boolean`
-----------------------------------

.. type-along:: For those who follow the tutorial with the help of the git repository

    Now you need to checkout the `v1.1_033` version::
     
          git checkout v1.1_033

Let's add one more variable in the `manual` family, with a much more basic type: `boolean`.

.. extinclude:: https://forge.cloud.silique.fr/stove/rougail-tutorials/raw/tag/v1.1_033/firefox/20-manual.yml
   :language: yaml
   :caption: A new structure file :file:`firefox/20-manual.yml` with one variable

.. 
    %YAML 1.2
    ---
    version: 1.1

    manual:

      use_for_https: true  # Also use this proxy for HTTPS
    ...

:tutorial:`Download this file from the rougail-tutorials git repository <src/tag/v1.1_033/firefox/20-manual.yml>`

.. note:: 

    - it is not necessary to declare the variable as a boolean type
      this type is *inferred* by the `true` default value
    
    - we have decided to create a new structure file :file:`firefox/20-manual.yml`. 
      This is not necessary but usefull, please have a look at the :ref:`structure file organization and naming conventions <namingconvention>`



.. keypoints:: let's review the key points

    - we can assign a `domainname` type to a variable
    - we can set a :term:`parameter` to a `domainname` variable to refine their typing behavior
    - we can assign a `port` type to a variable