Show image dimensions in the media manager sidebar

[AIC-BV]

Supersedes #958, rebuilt on current develop to address the review there.

Changes

Selecting an image in the media manager now shows its dimensions in the sidebar.

• MediaLibrary::getMetadata($path) returns ['dimensions' => ['width' => …, 'height' => …]] for images and [] for anything else.
• onGetSidebarThumbnail() includes it as metadata in its response, and the sidebar shows a Dimensions row only when the response has them.

Review feedback on #958

• Non-local disks (@LukeTowers): dimensions are read through readStream(), not path(), so any Flysystem disk works. The file is read in 64 KB chunks until the dimensions are found. That usually happens in the first chunk, but a JPEG with large EXIF or ICC blocks can need more. Reading stops at 1 MB.
• Non-image files (@jaxwilko): only files whose getFileType() is image are inspected.
• Constructor signature (@LukeTowers): MediaLibraryItem is unchanged. Dimensions are worked out when a file is selected, not while a folder is listed. Listing on a remote disk would otherwise mean one request per image. So no item ever gets them at listing time, and a constructor argument would go unused. The metadata uses the shape you suggested and is returned from getMetadata(). If you'd still like it on the item, it can be added as a trailing array $metadata = [].

Tests

MediaLibraryTest has four new tests:

• a local-disk read;
• a mocked remote disk that fails if get() or path() is called;
• a JPEG padded past 64 KB, read further through the same stream;
• a JPEG padded past 1 MB, which returns no dimensions.

All 31 tests in the file pass, and phpcs is clean.

I also ran getMetadata() against a real media library of 9,232 images. It matched getimagesize() on the full file for 9,128 of them, with the slowest read taking 9 ms. The other 104 have names garbled by a CP437 re-encoding, which validatePath() rightly rejects. That rule is unchanged by this PR. Decomposed (NFD) accents are a separate case, handled in #1548. The JPEG that needed the most data needed 704 KB.

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Summary by CodeRabbit

• New Features
  • Media previews now display image dimensions in the sidebar when available.
  • Added English and Dutch translations for the dimensions label.
• Bug Fixes
  • Sidebar thumbnails remain available if metadata cannot be retrieved.

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ℹ️ Recent review info

⚙️ Run configuration

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📥 Commits

Reviewing files that changed from the base of the PR and between 9105d83 and 9261f70.

📒 Files selected for processing (2)

• modules/system/classes/MediaLibrary.php
• modules/system/tests/classes/MediaLibraryTest.php

🚧 Files skipped from review as they are similar to previous changes (2)

• modules/system/classes/MediaLibrary.php
• modules/system/tests/classes/MediaLibraryTest.php

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Walkthrough

MediaLibrary now provides image-dimension metadata by reading image data from a storage stream, with a 1 MB limit for unresolved JPEG dimensions. The media manager includes metadata in its sidebar thumbnail response and displays available dimensions. English and Dutch translations and metadata extraction tests were added.

Priority: ⬇️ Low

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

Merge Risk: ⚪ Minimal · up to 9261f

Image dimensions can be shown in the sidebar without an identified merge-blocking issue. The change is ready for normal checks.

Security Architecture Review

Security architecture risk: 🟡 Moderate · up to 9105d

Most image selections use a limited read, but certain JPEGs cause the server to load the entire file on every metadata request. Large files could consume substantial memory and storage bandwidth.

Retained concerns

• Medium · security · inferred: A crafted or unusually large JPEG can make each sidebar metadata request load the entire file into server memory, including from a remote media disk. Repeated requests could exhaust workers or storage bandwidth.

Security review details

Security Blast Radius

• inferred — The added read is limited to the configured media disk, but its full-file fallback can consume application-worker memory and remote-disk bandwidth. The inspected evidence does not establish who can invoke the handler or place files on that disk.

Security Findings and Attack Paths

• inferred — If a user can place or select a sufficiently large JPEG with dimensions beyond the initial header, repeated sidebar requests trigger repeated full-file reads. This is an availability path, not evidence of a path traversal or unauthorized file-content response.

Trust Boundaries and Controls

• observed — The handler and library both validate the supplied path before resolving media storage. The handler catches metadata exceptions, but that does not limit resources consumed before an exception.

Resilience and Maintainability Implications

• observed — The tests cover a stream-only disk for the usual case and explicitly require a full-file get for a JPEG with a large header; they do not establish an upper bound for that fallback.

Hardening Proposals

• proposed — Bound the JPEG fallback by size or incremental parsing, and consider caching dimensions so repeated selections do not repeat remote reads.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 38.46% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 13 functions across 8 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
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.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: displaying image dimensions in the media manager sidebar.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

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Actionable comments posted: 1

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Inline comments:
In `@modules/system/classes/MediaLibrary.php`:
- Line 703: Bound the JPEG fallback around getimagesizefromstring in the media
dimension lookup so it never loads an unbounded file into PHP memory; parse only
up to a defined limit and return no dimensions if that limit is reached.

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ℹ️ Review info

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Configuration used: Organization UI

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Run ID: e5ef2fa2-65c2-4251-bf4f-36c412fb5aab

📥 Commits

Reviewing files that changed from the base of the PR and between 44e9d68 and 9105d83.

📒 Files selected for processing (8)

• modules/backend/lang/en/lang.php
• modules/backend/lang/nl/lang.php
• modules/backend/widgets/MediaManager.php
• modules/backend/widgets/mediamanager/assets/js/mediamanager-browser-min.js
• modules/backend/widgets/mediamanager/assets/js/mediamanager.js
• modules/backend/widgets/mediamanager/partials/_right-sidebar.php
• modules/system/classes/MediaLibrary.php
• modules/system/tests/classes/MediaLibraryTest.php

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