UHF-10255: Add module for X-Robots-Tag handling if helfi_proxy can't be used

[juho-lehmonen]

UHF-10255

What was done

• Add a new module that adds the X-Robots-Tag: noindex, nofollow header when DRUPAL_X_ROBOTS_TAG_HEADER environment variable is set to true.

How to install

• Set up Palvelukeskus
  • git checkout dev
  • make fresh shell
  • composer require drupal/helfi_platform_config:dev-UHF-10255-add-module-for-robots-header
  • drush en helfi_robots_header
• Run make drush-cr

How to test

• Open any page and check that the x-robots-tag header is not set.
• Add DRUPAL_X_ROBOTS_TAG_HEADER: 1 to compose.yaml under services -> app -> environment, then run make up drush-cr
  • Reload the page. The header should be set now
• Remove the env variable line from compose.yaml, then run make up drush-cr
  • Reload the page. The header should be gone.
• Check that code follows our standards

Test if this breaks anything on another instance

• Set up a second instance, doesn't matter which one, but it should have helfi_proxy enabled (for example KYMP, SOTE, etc)
• Follow the same installation instructions, see if anything breaks
• Follow the test instructions, see if anything breaks or something weird happens

Continuous documentation

• This feature has been documented/the documentation has been updated

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[khalima]

Tested this functionality with Palvelukeskus (without helfi_proxy) and with KYMP (with helfi_proxy). In both cases it seemed to work without any weird issues.