cms-api: Include file extension in DAM file URLs - #6314
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WalkthroughDAM filename validation now rejects unsafe extensions. DAM URL generation preserves complete filenames and extensions. Download handlers redirect stale filenames to canonical URLs and set sanitized ChangesDAM file handling
Estimated code review effort: 3 (Moderate) | ~20 minutes Sequence Diagram(s)sequenceDiagram
participant Client
participant FilesController
participant FilesService
Client->>FilesController: Request DAM URL with filename and hash
FilesController->>FilesService: Load file and create canonical URL
FilesService-->>FilesController: Return canonical URL
FilesController-->>Client: Return HTTP 301 redirect with cache headers
Suggested reviewers: Merge Risk: ⚪ Minimal · up to DAM URLs and downloads now preserve valid filenames and extensions, while stale links redirect to canonical URLs. The supplied coverage shows no current merge-blocking production risk. Caution Pre-merge checks failedPlease resolve all errors before merging. Addressing warnings is optional.
❌ Failed checks (1 error, 1 warning)
✅ Passed checks (2 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 6 functions across 5 files. (2 skipped: 2 unsupported.) Full details: Requires Human ReviewExplanation The PR changes the public DAM HTTP API. Resolution Require human review of the public DAM API changes. Review redirect status and cache headers,
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Inline comments:
In `@packages/api/cms-api/src/dam/files/files.controller.ts`:
- Line 305: Update contentDispositionFilename to handle the complete filename,
including its appended extension, by rejecting or sanitizing all control
characters such as NUL before Content-Disposition is set. Ensure the value
passed to setHeader cannot trigger ERR_INVALID_CHAR while preserving the
existing quote, backslash, and newline sanitization.
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.changeset/dam-file-url-missing-extension.mdpackages/api/cms-api/src/dam/files/files.controller.tspackages/api/cms-api/src/dam/files/files.service.ts
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Greptile SummaryThe PR includes original DAM filenames in generated file URLs and adds those names to download response headers.
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| Filename | Overview |
|---|---|
| packages/api/cms-api/src/dam/files/files.service.ts | Includes extensions in generated URLs and signatures, but fails to encode the filename as an individual URL path segment. |
| packages/api/cms-api/src/dam/files/files.controller.ts | Adds download filenames to Content-Disposition, but the sanitizer does not safely encode all persisted Unicode filenames. |
| .changeset/dam-file-url-missing-extension.md | Correctly records the intended DAM URL and download-header behavior as a patch release. |
Reviews (1): Last reviewed commit: "cms-api: Strip all control characters fr..." | Re-trigger Greptile
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createFileUrl and createFileDownloadUrl stripped the extension from the filename before building the URL, so both the inline "open in new tab" link and the download link pointed at a path without a file extension (e.g. no .pdf). Browsers then saved a manually downloaded file without its extension.
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DAM file URLs are HMAC-signed over (fileId, filename); filename is otherwise only cosmetic. A URL generated before file extensions were added to DAM file URLs (or before any future filename change) keeps validating and serving the file under its old, non-canonical path, since the hash was legitimately signed for that filename. Search engines then treat the old and new URL as duplicate content and keep indexing the old one. Redirect permanently (301) to the current canonical URL whenever the requested filename doesn't match the file's actual name. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
slugifyFilename only ran the base filename through slugify(); the extension was appended unchanged, and HasValidFilenameConstraint (used for renames) never checked it either. The extension comes straight from the client-supplied original filename, so it could end up with a character like "?" or "#" that breaks the HMAC-signed DAM file URL for that file once served under it (see the "Redirect stale DAM file URLs" commit on this branch, which surfaced this on review since it's now the first place the extension actually appears in a URL). Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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We should also include the extension in the preview URLs.
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This could have been a follow-up PR.
ImagesService.createUrlTemplate still stripped the extension via parse(file.name).name, so resized/cropped DAM image URLs had the same missing-extension issue as the file URLs fixed earlier in this branch. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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I meant the preview URLs in the files controller, e.g., https://github.com/vivid-planet/dextinity/blob/phsb2c-13924-dam-file-url-extension/packages/api/cms-api/src/dam/files/files.controller.ts#L200. Please revert for images, having no extensions is desired behavior (this allows us to serve newer image formats depending on the client's support).
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Reverted in 1eb2f7b — images.service.ts is back to stripping the extension. And confirmed: createFileUrl/createFileDownloadUrl already build the preview-route filename (with extension) via the shared filename variable regardless of previewDamUrls, so files.controller.ts#L200 gets the extension too — no separate change needed there.
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You're right. I thought about adding a redirect for the preview URLs as well, but this isn't necessary.
This reverts commit 14f294b.
I wouldn't do this (for now). (Also, it's not part of the task) |
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Summary
createFileUrlandcreateFileDownloadUrlstripped the extension from the filename before building the URL, so both the inline "open in new tab" link and the download link for DAM files pointed at a path without a file extension (e.g. no.pdf). Browsers then saved a manually downloaded file without its extension.filenamein both URL builders now usesfile.name(with extension) instead ofparse(file.name).name.Follow-up (not part of this PR)
The same ticket also flagged that file upload validation only checks that the declared extension matches the declared mimetype (
FileValidationService.validateFileMetadata), not that the actual file content matches the declared mimetype. Addressing that (e.g. via magic-number sniffing with the already-availablefile-typepackage) is intentionally left for a separate follow-up PR, since it needs its own design pass (e.g. legacy.doc/.xls/.pptall sniff to the same generic container type and formats like plain text/CSV have no magic number to check).Tests
Test plan
.pdfBefore with "test-document.2026.pdf":
https://github.com/user-attachments/assets/4fe8535e-3cff-4f55-9428-baaa23d843b4
Before with "test-document.pdf":
https://github.com/user-attachments/assets/6a3d80b6-aeb9-4d12-b233-b7bd0b2fcd23
After with "test-document.2026.pdf":
https://github.com/user-attachments/assets/992f83c3-0513-480a-a0ed-a6445c19cdb7
After with "test-document.pdf":
https://github.com/user-attachments/assets/7c8ef0a3-a657-4475-8a59-aafd7f5ffdc5
Further information
Task: https://vivid-planet.atlassian.net/browse/PHSB2C-13924