[Decipher]

Relates to https://www.drupal.org/i/3277844.

Problem

Every upload on a File (Field) Paths field is staged at <temp_location>/<original filename> until the entity is saved and the file moves to its real path. When two uploads share a name they share that staged path. The first file moves out on save, and the next upload of a one.jpg lands on the exact path the first one had.

The image widget's preview URL is built from that path, and so is its itok. Both files get the same preview URL. Under temporary:// staging the derivative route is no_cache and it only bites a browser that has the old thumbnail cached. Under public:// staging, which is what the reporter had in 2022 and what any site without a writable temporary:// still has, the derivative is a static file with a one year Expires header, so the second upload shows the first file's thumbnail. That is the reporter's "wrong image" on the edit form.

The functional test testStagedPreviewUrlIsUnique fails on 8.x-1.x with both previews at /filefield_paths/image-style/thumbnail/temporary?file=filefield_paths/one.jpg.webp&itok=-ieRj2dN.

The other two symptoms on the issue (images in the wrong order, one image duplicated onto another item) do not reproduce on the current branch. testReplaceAllImages removes three images from a node and uploads three new ones, and every alt, URI and checksum lands where it should.

Fix

FieldWidgetSingleElementForm::formAlter() now stages each upload under <temp_location>/ffp-<random>/. A new path means a new preview URL and a new itok, so nothing cached for an earlier upload can be served for this one. The existing access check, URL rewrite and download grant for temporary:// staging all match on the temp_location prefix, so nested paths pass unchanged. The move hook already removes empty source directories after a save.

An upload that is never saved is deleted by cron, which would leave its empty ffp-* directory behind. A new hook_file_delete in Hook\File removes that directory. The name alone does not prove this module made the directory, so it is only removed when it sits directly inside a configured staging location, the global temp_location or a field level override. rmdir() fails on one that still holds files. The hook has a #[LegacyHook] wrapper in filefield_paths.module so it also fires on Drupal 10, where hook classes are not discovered.

The third commit closes two gaps in the first two. An unset temp_location used to give an upload location of /ffp-<random>, a path with no stream wrapper, so every upload failed on a site whose settings lacked the value, where 8.x-1.x degrades safely. And the cleanup hook trimmed temporary:// to temporary: while the directory it compared against kept its slash, so a staging location set to a bare scheme root never matched and its directories leaked. A new StagingLocation helper resolves the configured value the way core does (temporary:// when nothing is set, one trailing slash otherwise) and recognises a staging directory directly inside it; both hooks use it, so the widget and the cleanup agree by construction.

Tests

Test	Layer	Before	After
FileFieldPathsMultiValueReplaceTest::testStagedPreviewUrlIsUnique	Functional	Fails, identical preview URLs	Passes
FileFieldPathsMultiValueReplaceTest::testReplaceAllImages	Functional	Passes	Passes
StagingDirectoryCleanupTest (seven tests)	Kernel	testEmptyStagingDirectoryIsRemoved and testStagingNameOutsideTheStagingLocationIsKept fail	Passes, including a bare scheme root and an unset location
StagingLocationTest (17 cases)	Unit	New	Passes
FieldWidgetSingleElementFormTest	Unit	Two assertions updated, three tests added	Passes, including an unset location and a bare private://
FileFieldPathsGeneralTest	Functional	Two staged URL assertions loosened to match the subdirectory	Passes

The multi-value test runs without Pathauto. Pathauto has no part in the staged path, and it trips a PHP 8.5 deprecation on every node form (https://www.drupal.org/project/pathauto/issues/3579655).

Local runs: unit 57, the two staging kernel classes 11, lint clean; the full suite including the functional tests is green in CI.

Summary by CodeRabbit

• New Features

  • Uploads are now staged in unique directories, preventing same-named files from sharing paths or preview URLs.
  • Staging works with configured locations, bare scheme roots, and falls back to the default temporary location when needed.
  • Empty staging directories are automatically removed when temporary uploads are deleted.

• Bug Fixes

  • Improved cleanup safeguards ensure unrelated directories and staging folders containing files are preserved.
  • Multi-value image replacements now retain correct upload order, metadata, file content, and preview paths.

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📝 Walkthrough

Walkthrough

The upload form now stages each file in a unique ffp-* directory. The file deletion hook removes empty module-created staging directories. Unit, kernel, and functional tests validate path isolation, cleanup, and multi-value image replacement.

Changes

Upload staging and cleanup

Layer / File(s)	Summary
Create unique upload staging paths src/StagingLocation.php, src/Hook/FieldWidgetSingleElementForm.php, tests/src/Unit/*	Configured locations are normalized, and each upload uses a random ffp-* subdirectory. Unit tests cover fallback locations, scheme roots, and distinct upload paths.
Remove empty staging directories src/Hook/File.php, filefield_paths.module, tests/src/Kernel/StagingDirectoryCleanupTest.php	The deletion hook removes empty matching staging directories under configured locations. Tests cover non-empty, unrelated, field-specific, scheme-root, and fallback locations.
Validate isolated uploads and replacement flows tests/src/Functional/FileFieldPathsGeneralTest.php, tests/src/Functional/FileFieldPathsMultiValueReplaceTest.php	Functional tests validate staged upload URLs, multi-value image replacement, unique file URIs, configured paths, and unique preview URLs.
Document and maintain the change CHANGELOG.md, .cspell.json	The changelog records the staging and cleanup behavior. The spelling dictionary adds and reorders recognized terms.

Priority: ➖ Normal

Estimated code review effort: 3 (Moderate) | ~25 minutes

Change: Bug fix · Severity of issue fixed: Medium

Sequence Diagram(s)

sequenceDiagram
  participant FieldWidgetSingleElementForm
  participant Crypt
  participant FileEntity
  participant filefield_paths_file_delete
  participant File
  participant FileSystemInterface
  FieldWidgetSingleElementForm->>Crypt: Generate random staging suffix
  Crypt-->>FieldWidgetSingleElementForm: Return suffix
  FieldWidgetSingleElementForm->>FileEntity: Stage upload under ffp-* directory
  FileEntity->>filefield_paths_file_delete: Invoke file deletion hook
  filefield_paths_file_delete->>File: Call fileDelete()
  File->>FileSystemInterface: Remove empty configured staging directory

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Merge Risk: ⚪ Minimal · up to 37135

The documented cleanup behavior matches the implementation: empty staging directories are removed while directories containing files remain intact. No actionable merge risk remains.

🚥 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: each upload is staged in its own directory.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 35 functions across 8 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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Actionable comments posted: 1

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Inline comments:
In `@src/Hook/File.php`:
- Around line 73-74: Update the cleanup logic in the file URI handling around
preg_match and rmdir so it removes directories only when ownership by this
module is recorded or an authoritative staging-root marker verifies them; do not
rely solely on the ffp-* name pattern. Add a kernel test covering an unrelated
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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.36%. Comparing base (f2b9743) to head (3713519).

Additional details and impacted files

@@             Coverage Diff             @@
##           8.x-1.x      #31      +/-   ##
===========================================
+ Coverage    83.90%   84.36%   +0.46%     
===========================================
  Files           20       21       +1     
  Lines          814      838      +24     
===========================================
+ Hits           683      707      +24     
  Misses         131      131              

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[Decipher]

Merged on Drupal.org as efa43e2 (same patch, squashed) and 8.x-1.x is synced here. Closing this PR.