Updating composer packages blocked

[johanib]

I noticed a lot of Dependabot PR's. Upon trying to run composer update -W, I ran into some issues:

root@engine:/var/www/html# composer update -W
Loading composer repositories with package information
Restricting packages listed in "symfony/symfony" to "7.4.*"
Updating dependencies
Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - Root composer.json requires simplesamlphp/assert ^1.9.1 -> satisfiable by simplesamlphp/assert[v1.9.1].
    - simplesamlphp/assert v1.9.1 requires guzzlehttp/psr7 ~2.8.0 -> found guzzlehttp/psr7[2.8.0, 2.8.1] but these were not loaded, because they are affected by security advisories ("PKSA-7qs6-zvnz-h66r", "PKSA-gm5x-j3mz-71n9", "PKSA-jj5t-2zs1-dcfm"). Go to https://packagist.org/security-advisories/ to find advisory details. To ignore the advisories, add their IDs to the "policy.advisories.ignore-id" config or add the package to "policy.advisories.ignore". To turn the feature off entirely, you can set "policy.advisories.block" to false.
  Problem 2
    - Root composer.json requires simplesamlphp/saml2 ^4.19 -> satisfiable by simplesamlphp/saml2[v4.20.3].
    - simplesamlphp/saml2 v4.20.3 requires simplesamlphp/xml-common ^2.7 -> satisfiable by simplesamlphp/xml-common[v2.7.0, ..., v2.8.1].
    - simplesamlphp/xml-common[v2.7.0, ..., v2.8.1] require ext-bcmath * -> it is missing from your system. Install or enable PHP's bcmath extension.

      Alternatively you can require one of these packages that provide the extension (or parts of it):
      Keep in mind that the suggestions are automated and may not be valid or safe to use
      - phpseclib/bcmath_compat PHP 5.x-8.x polyfill for bcmath extension
      - nanasess/bcmath-polyfill PHP 8.4 bcmath functions polyfill with fallback compatibility for environments without bcmath extens
      - phuture/continuum A forward-compatibility layer bringing tomorrow’s PHP features to today’s runtimes.
      - lumisys/bcmath_compat PHP 5.x/7.x polyfill for bcmath extension


To enable extensions, verify that they are enabled in your .ini files:
    - /usr/local/etc/php/php-cli.ini
    - /usr/local/etc/php/conf.d/docker-php-ext-gd.ini
    - /usr/local/etc/php/conf.d/docker-php-ext-gmp.ini
    - /usr/local/etc/php/conf.d/docker-php-ext-intl.ini
    - /usr/local/etc/php/conf.d/docker-php-ext-pdo_mysql.ini
    - /usr/local/etc/php/conf.d/docker-php-ext-sodium.ini
    - /usr/local/etc/php/conf.d/docker-php-ext-xdebug.ini
You can also run `php --ini` in a terminal to see which files are used by PHP in CLI mode.
Alternatively, you can run Composer with `--ignore-platform-req=ext-bcmath` to temporarily ignore these required extensions.

Use the option --with-all-dependencies (-W) to allow upgrades, downgrades and removals for packages currently locked to specific versions.

Trying to upgrade to simplesamlphp/assert:^2.0 gave other issues:

Root cause found: two chained composer.json dependency conflicts, not a config bug.                                                                    
                                                                                                                                                       
 - Problem 1:  simplesamlphp/assert ^1.9.x  hard-pins  guzzlehttp/psr7 ~2.8.0 , and both published 2.8.0/2.8.1 releases carry real security advisories 
(host-confusion/header-injection). Composer correctly refuses to install them.                                                                         
 - Problem 2: Bumping to  simplesamlphp/assert v3.0.0  (drops the psr7 dep entirely — the real fix) needs  webmozart/assert ~2.1 , but: -  openconext/ 
monitor-bundle  (latest release 4.3.1) has never published a version supporting  webmozart/assert ^2  — verified in its GitHub composer.json.          
 -  simplesamlphp/saml2 ^4.20  (which does support webmozart ^2) needs  simplesamlphp/xml-common ^2.7 , which requires  ext-bcmath , missing from the  
PHP runtime.                                                                                                                                           
                                                                                                                                                       
No single-repo fix exists today. Documented two paths in plan.md:                                                                                      
                                                                                                                                                       
 - Path A (mitigate): add advisory IDs to  composer.json   config.audit.ignore , stay on current versions — unblocks installs but leaves the psr7 vuln 
in place.                                                                                                                                              
 - Path B (full fix): PR to  OpenConext/Monitor-bundle  for webmozart ^2 support, then bump  simplesamlphp/assert  → ^3.0,  simplesamlphp/saml2  →     
^4.20, enable  ext-bcmath  in the runtime image, run full PHPUnit suite for breaking changes.                                                          

Tasks:

• We should consider upgrading to the latest simplesamlphp/saml2, as that is the biggest blocker with the most impact.
• Check with SURF: https://github.com/simplesamlphp/xml-common version 2 seems to require ext-bcmath. The EB container does not have that extension installed. Should we add it?
• SAML package migration #2031 might also improve the situation, but maybe not resolve it completely.

Acceptance criteria:

• webmozart/assert:2.4.1 is able to be installed into EB so it does not hold other packages back.