fix(files): memory usage in filter_wp_read_image_metadata()

[sjinks]

Description

Reduce memory usage in VIP_Filesystem::filter_wp_read_image_metadata() by using copy() instead of file_get_contents()/file_put_contents().

The symptoms are:

PHP message: PHP Fatal error:  Allowed memory size of 805306368 bytes exhausted (tried to allocate 5046659072 bytes) in /wp/wp-content/mu-plugins/files/class-vip-filesystem.php on line 454

Changelog Description

Fixed

• Reduced memory consumption in the VIP File Service plugin when retrieving metadata of a large file.

Pre-review checklist

Please make sure the items below have been covered before requesting a review:

• This change works and has been tested locally or in Codespaces (or has an appropriate fallback).
• This change works and has been tested on a sandbox.
• This change has relevant unit tests (if applicable).
• This change uses a rollout method to ease with deployment (if applicable - especially for large scale actions that require writes).
• This change has relevant documentation additions / updates (if applicable).
• I've created a changelog description that aligns with the provided examples.

Pre-deploy checklist

• VIP staff: Ensure any alerts added/updated conform to internal standards (see internal documentation).

Steps to Test

Upload a large file (its size should exceed the memory available to PHP) before and after this patch.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 29.43%. Comparing base (98fd1d3) to head (7a239f3).

Files	Patch %	Lines
files/class-vip-filesystem.php	0.00%	1 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #5554      +/-   ##
=============================================
+ Coverage      29.41%   29.43%   +0.01%     
  Complexity      4764     4764              
=============================================
  Files            281      281              
  Lines          20544    20532      -12     
=============================================
  Hits            6043     6043              
+ Misses         14501    14489      -12     

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[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud

[Adirael]

Folded in my branch with dynamic timeouts on the download path, it's an extra call to VIP FS and probably needs some more defensive code and testing :)

ю

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud