fix(#3494240): skip the redirect when a file leaves the staging location

[Decipher]

Relates to https://www.drupal.org/i/3494240. Follows the redirect source fix that landed as 8423c05; the two together close the junk-row bug found while setting up the 8.x-1.0-rc2 demo.

Problem

With "Create Redirect" and active updating on, every first save of a new upload created a redirect from the staging path to the final path. The staging path only ever existed between the upload and the save, so nothing could link to it, and the redirect table grew by one row per upload. Under rc2's temporary:// default the source of that row was also malformed, which 8423c05 fixed.

Fix

FileFieldPathsProcessFileLegacy skips the redirect when the file is still at the staging location, global or field level, before the move. A bare scheme root such as public:// is not treated as a staging location: used as a prefix it would match every file on the scheme and stop redirects being created at all. The settings form accepts a bare root, so this case is real.

Tests

StagingRedirectTest, five kernel tests: a new entity earns no redirect; an existing entity gaining a staged upload earns none; an existing entity whose file moves from a published path still does; a bare scheme root does not suppress redirects; a field level staging location wins over the global one. The test pins temp_location to public://filefield_paths because rc2 moved the install default to temporary://filefield_paths.

Commits

Two commits. The first is Sakshi Sharma's, from their merge request on the issue in 2024-12: no redirect when the entity is being created, remade on the current hook class because the line it changed has since moved out of filefield_paths.inc. The second is mine: no redirect when the file is only now leaving the staging location, which also covers an existing entity that gains an upload, plus the bare scheme root guard, the tests voleger asked for, and the changelog entry.

Summary by CodeRabbit

• Bug Fixes

  • Prevented redirects when files move from a staging location, including on an entity’s first save.
  • Improved staging-location detection, including support for field-specific locations. Bare scheme roots such as public:// are not treated as staging locations.
  • File moves from published locations continue to create redirects.

• Tests

  • Added coverage for staging uploads, published file moves, new entities, temporary URI schemes, and staging-location precedence.

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📝 Walkthrough

Walkthrough

The file processing hook checks whether a file URI matches a configured staging location before creating a redirect. Kernel tests cover staging paths, published files, new entities, bare scheme roots, and unregistered temporary schemes.

Changes

Staging-aware redirects

Layer / File(s)	Summary
Redirect detection and staging-path resolution src/Hook/FileFieldPathsProcessFileLegacy.php	The hook receives ConfigFactoryInterface, resolves field-level or global staging paths, and skips redirects for staged uploads. It also checks for active updating, an existing content entity, and the redirect module.
Redirect behavior validation tests/src/Kernel/StagingRedirectTest.php, tests/src/Kernel/FileFieldPathsProcessFileLegacyTest.php, CHANGELOG.md	Kernel tests cover staged and published files, new entities, bare scheme roots, field-level staging locations, and unregistered temporary schemes. The changelog records the redirect behavior.

Priority: ⬇️ Low

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Bug fix

Merge Risk: 🟡 Moderate · up to efa93

First saves can now move already published files without preserving their old URLs, potentially breaking existing links. Confirm or narrow this behavior before merging; staging exclusions and redirects for published files moved on updates behave as intended.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: skipping redirects when a file leaves its staging location.
Docstring Coverage	✅ Passed	Docstring coverage is 93.33% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 15 functions across 3 files. (1 skipped: 1 …
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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[codecov]

Codecov Report

❌ Patch coverage is 92.30769% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 84.82%. Comparing base (efa43e2) to head (efa9394).

Files with missing lines	Patch %	Lines
src/Hook/FileFieldPathsProcessFileLegacy.php	92.30%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           8.x-1.x      #24      +/-   ##
===========================================
+ Coverage    84.36%   84.82%   +0.45%     
===========================================
  Files           21       21              
  Lines          838      850      +12     
===========================================
+ Hits           707      721      +14     
+ Misses         131      129       -2     

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Actionable comments posted: 1

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Inline comments:
In `@src/Hook/FileFieldPathsProcessFileLegacy.php`:
- Around line 164-166: Update the redirect condition in
FileFieldPathsProcessFileLegacy so it does not require
settings['active_updating']; retain the module, redirect, and isStagedUpload
checks so redirects occur for public published files while staged uploads remain
suppressed. Add a kernel test covering a new entity referencing a public
published file with active updating disabled.

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[Decipher]

Checked this against the pre-PR code, and the finding is real but it is not introduced here.

The active_updating requirement on the redirect predates this branch. At d23f47e2, before any change of mine:

// Create redirect from old location.
if (
  !empty($settings['redirect']) && $settings['active_updating'] &&
  $this->moduleHandler->moduleExists('redirect')
) {

This PR adds only the !$this->isStagedUpload(...) clause. So the case you describe, a new entity referencing public://published/... with active_updating disabled, already moved the file and already skipped the redirect before this change. Removing the active_updating requirement would be a behaviour change to a separate documented setting, widening when redirects are written, which is beyond a fix scoped to https://www.drupal.org/i/3494240 and wants its own issue and its own release note.

Worth saying that the underlying observation looks sound to me: if the module moves a file away from a path that was publicly reachable, a redirect is the right outcome regardless of the active_updating setting, and the current coupling of the two settings is questionable. I am raising it separately rather than folding it in here.

For what this PR does cover, StagingRedirectTest pins all four paths: staged upload leaves no redirect, a genuinely published file still gets one, a bare scheme root does not suppress scheme-wide, and the field level staging location takes precedence over the global one.

[Decipher]

Merged on Drupal.org as e11c357 (same patch, squashed, Sakshi Sharma as author) and 8.x-1.x is synced here. Closing this PR.