fix(media-core): detect MIME from encoded URL extensions by VectorPeak · Pull Request #102649 · openclaw/openclaw

VectorPeak · 2026-07-09T10:13:47Z

Fixes encoded HTTP(S) media URLs such as render%2Emp4 being treated as unknown by the media-core MIME fallback.

What Problem This Solves

new URL(...).pathname keeps percent-encoded filename bytes. On current main, getFileExtension() passes that pathname directly to path.extname(), so URLs such as render%2Emp4 and clip%2Ewebm do not expose a recognized extension.

This is reachable outside Discord. The capability CLI accepts a remote media path and passes it as filePath / mediaUrl to describeImageFile(). That enters runMediaUnderstandingFile() and buildFileContext(), where mimeTypeFromFilePath(remoteRef) determines the attachment MediaType. Without this fix, an encoded video URL requested through the image capability falls back to image/*; with the fix it remains video/mp4.

Why This Change Was Made

The URL branch now:

extracts only the final pathname component, including preserving an empty final component for URLs ending in /;
keeps encoded / and \ bytes (%2F / %5C) literal while decoding the rest of the filename, so object-key data cannot become a path boundary;
uses path.posix.extname() for URL filename parsing, making URL semantics independent of the host OS;
falls back to the raw final component when that component contains malformed percent encoding.

Local filesystem path behavior is unchanged. The change does not decode the full pathname, parse Content-Disposition, or infer a MIME type when encoded data appears after an otherwise valid extension.

User Impact

Supported encoded URL filenames now follow the same MIME fallback as their decoded equivalents:

https://cdn.example.com/render%2Emp4?download=1#preview -> video/mp4
https://cdn.example.com/render%2Em%70%34                -> video/mp4
https://cdn.example.com/render%2EMP4                   -> video/mp4
https://cdn.example.com/clip%2Ewebm                    -> video/webm

Encoded separators remain filename data rather than becoming path separators:

https://cdn.example.com/archive%2Fclip%2Emp4 -> video/mp4
https://cdn.example.com/archive%5Cclip%2Emp4 -> video/mp4
https://cdn.example.com/render.mp4%2Fpreview -> undefined
https://cdn.example.com/render.mp4%5Cpreview -> undefined

Evidence

Active non-Discord call chain:

openclaw capability CLI remote media input
  -> src/cli/capability-cli.ts describeImageFile({ filePath, mediaUrl })
  -> runMediaUnderstandingFile()
  -> buildFileContext()
  -> mimeTypeFromFilePath(remoteRef)
  -> normalizeMediaAttachments({ MediaType })
  -> runCapability({ ctx, media })

The evidence covers adjacent product layers without depending on network or provider execution:

The capability CLI test runs the registered capability image describe command with https://cdn.example.com/clip%2Emp4?download=1#preview and verifies that the real CLI entry preserves it as both filePath and mediaUrl.
The media-understanding runtime test starts at describeImageFile() and executes the real runMediaUnderstandingFile() / buildFileContext() path. normalizeMediaAttachments() and provider execution are mocked boundaries; the test verifies that the computed MediaType: video/mp4 is passed into normalization and the capability context.

Direct helper contract tests additionally verify that %2F / %5C remain literal extension content, malformed final encoding falls back to the raw filename, and a trailing slash leaves the final URL component empty.

Focused helper proof after the fix:

render%2Emp4?download=1#preview -> video/mp4
bad%ZZ/render%2Emp4             -> video/mp4
archive%2Fclip%2Emp4            -> video/mp4
archive%5Cclip%2Emp4            -> video/mp4
render.mp4%2Fpreview            -> undefined
render.mp4%5Cpreview            -> undefined
bad%E0%A4%A%2Emp4               -> undefined
render%2Emp4/                   -> undefined

Validation

node scripts/run-vitest.mjs run packages/media-core/src/mime.test.ts
Test Files  1 passed (1)
Tests       116 passed (116)

node scripts/run-vitest.mjs run src/media-understanding/runtime.test.ts
Test Files  1 passed (1)
Tests       21 passed (21)

node scripts/run-vitest.mjs run src/cli/capability-cli.test.ts
Test Files  1 passed (1)
Tests       106 passed (106)

node_modules/.bin/oxfmt --check \
  packages/media-core/src/mime.ts \
  packages/media-core/src/mime.test.ts \
  src/media-understanding/runtime.test.ts \
  src/cli/capability-cli.test.ts
All matched files use the correct format.

git diff --check
passed

Exact-head CI for e6368176 completed with no failures, including successful Real behavior proof runs.

Co-authored-by: chatgpt-codex-connector[bot] <199175422+chatgpt-codex-connector[bot]@users.noreply.github.com>

clawsweeper · 2026-07-09T10:21:54Z

Codex review: needs maintainer review before merge. Reviewed July 9, 2026, 9:19 AM ET / 13:19 UTC.

Summary
The PR changes media-core's HTTP(S) URL extension parser to decode the final pathname segment before MIME lookup and adds encoded URL extension regression tests.

PR surface: Source +7, Tests +18. Total +25 across 2 files.

Reproducibility: yes. at source level: current main passes URL.pathname directly to path.extname, and a focused Node URL/path probe shows percent-encoded extension dots remain encoded and do not map to .mp4. An active non-Discord product path remains unproven.

Review metrics: 1 noteworthy metric.

Public MIME helper behavior: 1 exported helper path changed. getFileExtension feeds mimeTypeFromFilePath and detectMime through plugin-sdk media surfaces, so maintainers should review the compatibility contract before merge.

Merge readiness
Overall: 🐚 platinum hermit
Proof: 🐚 platinum hermit
Patch quality: 🐚 platinum hermit
Result: ready for maintainer review.

Overall follows the weaker of proof and patch quality, so missing proof can cap an otherwise strong patch.

Rank-up moves:

[P2] Add or cite an active non-Discord call-chain reproduction for encoded URL filename MIME fallback.
[P2] Clarify the intended %2F/%5C separator semantics for the exported helper before merge.

Risk before merge

[P1] The PR changes exported media MIME helper behavior for existing plugin and core callers that currently classify encoded URL filename extensions as unknown.
[P1] The concrete Discord symptom is already fixed by fix(discord): split encoded video URLs from captions #101815, so maintainers still need to decide whether helper-level proof plus reachable non-Discord callers is enough for a shared public-helper change.
[P1] The intended %2F/%5C separator semantics remain compatibility-sensitive because the PR decodes the final URL segment before path.extname on an exported helper.

Maintainer options:

Prove the shared helper path first (recommended)
Before merge, require a non-Discord reproduction or maintainer-accepted contract note showing the public media-mime behavior change is intended for existing plugin/core callers.
Accept the broader fallback change
Maintainers may intentionally accept that encoded URL filename extensions now classify where they were previously unknown, relying on focused tests and exact-head CI.
Pause if no shared repro appears
If the only concrete symptom remains the already-merged Discord case, pause or close this PR rather than landing speculative public-helper behavior.

Next step before merge

[P2] A member assignee already set proof and contract criteria, so the remaining action is maintainer acceptance or rejection rather than a mechanical ClawSweeper repair.

Maintainer decision needed

Question: Is helper-level terminal proof plus reachable non-Discord callers sufficient to land this exported media-core MIME fallback change, or should merge wait for an active non-Discord user-path reproduction?
Rationale: The code now addresses the earlier whole-path decoding defect, but the remaining blocker is maintainer confidence in changing a public shared MIME helper beyond the already-fixed Discord case.
Likely owner: vincentkoc — vincentkoc is the current assignee, introduced the shared media MIME surface, and already stated the proof and separator-contract criteria for this PR.
Options:
- Require active shared repro (recommended): Keep this PR open but not mergeable until the author shows a concrete non-Discord call chain or user path where encoded URL filename MIME fallback currently fails.
- Accept helper-level proof: Treat the media-core helper behavior as its own bug contract and allow the PR to proceed with exact-head CI and ordinary review gates.
- Close or narrow owner-locally: If no non-Discord repro exists, leave the shared helper unchanged and rely on owner-local fixes such as the merged Discord repair.

Security
Cleared: The diff only changes URL filename extension parsing and focused tests; it does not touch dependencies, workflows, secrets, permissions, package resolution, install scripts, or downloaded code execution paths.

Review details

Best possible solution:

Settle the shared media-core contract with maintainer-visible non-Discord call-chain evidence, then either land this focused helper fix with agreed separator semantics or leave the shared helper unchanged and rely on owner-local fixes like #101815.

Do we have a high-confidence way to reproduce the issue?

Yes at source level: current main passes URL.pathname directly to path.extname, and a focused Node URL/path probe shows percent-encoded extension dots remain encoded and do not map to .mp4. An active non-Discord product path remains unproven.

Is this the best way to solve the issue?

Unclear as a merge decision: final-segment decoding is the narrow plausible helper shape, but maintainer feedback says the shared media-core fix still needs active non-Discord repro and separator-contract acceptance.

AGENTS.md: found and applied where relevant.

Codex review notes: model internal, reasoning high; reviewed against 3fd52514e35f.

Label changes

Label justifications:

P2: This is a normal-priority shared MIME fallback bugfix with limited blast radius and no evidence of outage, data loss, setup blocker, or security impact.
merge-risk: 🚨 compatibility: The PR changes exported media MIME helper behavior for existing plugin and core callers that pass encoded HTTP(S) URL filenames.
rating: 🐚 platinum hermit: Overall readiness is 🐚 platinum hermit; proof is 🐚 platinum hermit and patch quality is 🐚 platinum hermit.
status: 👀 ready for maintainer look: ClawSweeper has no concrete contributor-facing blocker left for this PR. Sufficient (terminal): The PR body includes after-fix terminal output from the actual media-core helpers plus focused validation output; no contributor action is needed for proof.
proof: sufficient: Contributor real behavior proof is sufficient. The PR body includes after-fix terminal output from the actual media-core helpers plus focused validation output; no contributor action is needed for proof.

Evidence reviewed

PR surface:

Source +7, Tests +18. Total +25 across 2 files.

View PR surface stats

Area	Files	Added	Removed	Net
Source	1	8	1	+7
Tests	1	18	0	+18
Docs	0	0	0	0
Config	0	0	0	0
Generated	0	0	0	0
Other	0	0	0	0
Total	2	26	1	+25

What I checked:

Repository policy read: Root AGENTS.md was read fully; no packages-scoped AGENTS.md exists, so the review applied the root policy requiring whole-path PR review, caller/sibling checks, proof review, and best-fix judgment. (AGENTS.md:1, 3fd52514e35f)
Current main behavior: Current main passes HTTP(S) URL pathnames directly to path.extname, so percent-encoded extension dots remain encoded before extension lookup. (packages/media-core/src/mime.ts:145, 3fd52514e35f)
Source-level reproduction: A focused Node URL/path probe showed render.mp4 yields .mp4 while render%2Emp4 and clip%2Ewebm have no raw extension under current pathname parsing. (3fd52514e35f)
PR implementation: The PR diff extracts the final URL pathname segment, decodes that segment, falls back on malformed percent encoding, and then applies path.extname. (packages/media-core/src/mime.ts:147, 043c74484cf9)
PR coverage: The PR adds detectMime and mimeTypeFromFilePath regression cases for encoded dots, encoded extension characters, uppercase encoded extensions, malformed earlier segments, encoded slash filenames, and encoded suffixes after extensions. (packages/media-core/src/mime.test.ts:154, 043c74484cf9)
Public helper surface: media-mime and the deprecated broad media-runtime barrel export the changed MIME helpers, and docs list media-mime as the narrow plugin MIME helper surface. (src/plugin-sdk/media-mime.ts:3, 3fd52514e35f)

Likely related people:

vincentkoc: Vincent Koc introduced the shared media MIME helper/export surface in the release commit and is the current assignee who set the proof and contract criteria for this PR. (role: introduced shared helper and current reviewer; confidence: high; commits: e085fa1a3ffd; files: packages/media-core/src/mime.ts, packages/media-core/src/mime.test.ts, src/plugin-sdk/media-mime.ts)
steipete: steipete merged the current-line media-core import PR and the related Discord encoded-video URL fix, and is credited as co-author on the Discord final-filename decoding refactor. (role: merger and adjacent refactor co-author; confidence: medium; commits: e84a0dde175e, 2cb482dd40ad; files: packages/media-core/src/mime.ts, src/plugin-sdk/media-mime.ts, extensions/discord/src/media-detection.ts)
VectorPeak: VectorPeak authored the merged Discord encoded-video URL fix that shares this PR's encoded-dot mechanism, so they are relevant beyond being the current PR author. (role: adjacent behavior contributor; confidence: medium; commits: 2cb482dd40ad; files: extensions/discord/src/media-detection.ts, extensions/discord/src/media-detection.test.ts, extensions/discord/src/outbound-adapter.test.ts)
velanir-ai-manager: Current git blame for getFileExtension points to the merged MSTeams/media-core import commit authored by velanir-ai-manager, though the behavior ownership appears shared with the media-core reviewers. (role: current-line author; confidence: medium; commits: e84a0dde175e; files: packages/media-core/src/mime.ts, packages/media-core/src/mime.test.ts, src/plugin-sdk/media-mime.ts)

What the crustacean ranks mean

🦀 challenger crab: rare, exceptional readiness with strong proof, clean implementation, and convincing validation.
🦞 diamond lobster: very strong readiness with only minor maintainer review expected.
🐚 platinum hermit: good normal PR, likely mergeable with ordinary maintainer review.
🦐 gold shrimp: useful signal, but proof or patch confidence is still limited.
🦪 silver shellfish: thin signal; proof, validation, or implementation needs work.
🧂 unranked krab: not merge-ready because proof is missing/unusable or there are serious correctness or safety concerns.
🌊 off-meta tidepool: rating does not apply to this item.

Shiny media proof means a screenshot, video, or linked artifact directly shows the changed behavior. Runtime, network, CSP, and security claims still need visible diagnostics.

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Review history (5 earlier review cycles)

reviewed 2026-07-09T10:26:15.397Z sha 927146d :: needs real behavior proof before merge. :: [P2] Decode only the URL filename
reviewed 2026-07-09T10:42:47.748Z sha bf83aff :: needs real behavior proof before merge. :: [P2] Decode only the URL filename
reviewed 2026-07-09T11:04:21.010Z sha 7dbcceb :: needs maintainer review before merge. :: none
reviewed 2026-07-09T11:21:39.931Z sha 5bde183 :: needs maintainer review before merge. :: none
reviewed 2026-07-09T12:10:44.146Z sha 54f63f5 :: needs maintainer review before merge. :: none

Decode only the final HTTP(S) URL pathname segment before extension lookup so malformed earlier segments do not block encoded filename extensions. Co-authored-by: chatgpt-codex-connector[bot] <199175422+chatgpt-codex-connector[bot]@users.noreply.github.com>

VectorPeak · 2026-07-09T10:48:19Z

Updated the branch and PR evidence for ClawSweeper's P1/P2 asks:

media-core now decodes only the final HTTP(S) URL pathname segment before extension lookup.
Added regression coverage for malformed earlier URL segments and encoded separator/suffix behavior.
Added after-fix terminal proof in the PR body showing both mimeTypeFromFilePath and detectMime returning expected MIME results for encoded URL examples.

@clawsweeper re-review

clawsweeper · 2026-07-09T10:48:21Z

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Lock in final-segment URL filename decoding behavior for uppercase encoded extensions, encoded slash filenames, and encoded separator suffixes. Co-authored-by: chatgpt-codex-connector[bot] <199175422+chatgpt-codex-connector[bot]@users.noreply.github.com>

VectorPeak · 2026-07-09T10:52:55Z

Added the extra URL filename edge coverage from the patch audit:

uppercase encoded extension: render%2EMP4 -> video/mp4
encoded slash before an encoded extension: archive%2Fclip%2Emp4 -> video/mp4
encoded backslash suffix after an extension: render.mp4%5Cpreview -> undefined
PR body now includes the updated after-fix helper output and 111 passed focused test result.

@clawsweeper re-review

clawsweeper · 2026-07-09T10:52:58Z

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ClawSweeper re-review requested.

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vincentkoc · 2026-07-09T11:04:00Z

This is not landable as written. The underlying %2E mechanism is real, but decoding the entire URL pathname is the wrong shared contract:

malformed encoding in an earlier segment prevents decoding a valid final filename, for example https://cdn.example/bad%ZZ/render%2Emp4;
decoded %2F or %5C can change path-segment semantics before path.extname() runs;
the malformed-input test keeps a raw .mp4 suffix, so it does not exercise the failure above;
no active shared caller failure is shown beyond the Discord case already fixed owner-locally by fix(discord): split encoded video URLs from captions #101815.

A viable shared fix needs an active non-Discord repro, final-component-only decoding that preserves encoded separators, and edge coverage for malformed earlier/final escapes, encoded separators, queries/fragments, and POSIX/Windows behavior. This also needs to clear the batch's non-triviality bar rather than landing as an eight-line speculative public-helper change.

VectorPeak · 2026-07-09T11:05:42Z

@vincentkoc Thanks. I will try it.

VectorPeak · 2026-07-09T11:09:04Z

@vincentkoc Thanks for the review. I’ll take another look at the real call chain for this media-core fallback.

If I can’t find enough real call-chain evidence to show that this is reachable and useful in practice, I’ll close the PR rather than keep pushing a weak case.

Thanks again for the detailed feedback.

Preserve encoded slash and backslash bytes while decoding URL filename extensions, and cover the active media-understanding runtime classification path for encoded video URLs. Co-authored-by: Vincent Koc <[email protected]> Co-authored-by: chatgpt-codex-connector[bot] <199175422+chatgpt-codex-connector[bot]@users.noreply.github.com>

VectorPeak · 2026-07-10T01:56:40Z

@vincentkoc I followed up on each point from your review on the latest head (33ad80db):

Active non-Discord runtime proof: src/media-understanding/runtime.test.ts now exercises buildFileContext() with an encoded remote video URL and verifies that the real runtime attachment becomes MediaType: "video/mp4" instead of falling back to image/*. This path is reached by the CLI remote-media flow: describeImageFile() -> runMediaUnderstandingFile() -> buildFileContext() -> mimeTypeFromFilePath() -> normalizeMediaAttachments() -> runCapability().
Final-component-only decoding: only the last URL pathname component is decoded, so malformed escapes in earlier segments no longer block a valid encoded filename.
Separator semantics: %2F and %5C are protected before decoding and remain literal encoded filename content; they cannot become path separators before extension lookup.
POSIX/Windows consistency: URL extension lookup now uses path.posix.extname(), so URL pathname semantics do not depend on the host OS.
Edge coverage: malformed earlier and final escapes, encoded separators, query/fragment handling, uppercase encoded extensions, and encoded suffixes after an extension are covered.

Validation on this exact head:

packages/media-core/src/mime.test.ts: 112 passed
src/media-understanding/runtime.test.ts: 21 passed
formatter check and git diff --check: passed
exact-head CI: all completed with no failures, including Real behavior proof

Could you please take another look? If this active runtime call-chain evidence still does not meet the bar for a shared helper change, I will close the PR as previously promised rather than expand the patch further.

@clawsweeper re-review

clawsweeper · 2026-07-10T01:56:43Z

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VectorPeak · 2026-07-10T02:55:05Z

@vincentkoc Follow-up on the latest head (e6368176) after an independent multi-agent audit:

The audit caught and fixed a potential trailing-slash regression: the code now slices strictly after the final / instead of using path.posix.basename(), so render%2Emp4/ has an empty final component and remains unclassified.
Direct getFileExtension() contract tests now prove that %2F / %5C remain literal extension content, rather than only asserting the eventual MIME lookup result.
The non-Discord evidence is now split into two explicit adjacent layers: the real registered CLI command preserves the encoded URL as filePath and mediaUrl, and the media-understanding runtime computes and forwards MediaType: video/mp4 through buildFileContext().
Malformed earlier/final escapes, encoded separators, query/fragment handling, encoded suffixes, trailing slashes, and host-independent URL extension semantics are covered without expanding the production surface.

Validation on this exact head:

media-core MIME tests: 116 passed
media-understanding runtime tests: 21 passed
capability CLI tests: 106 passed
formatter and git diff --check: passed
exact-head CI: completed with no failures; Real behavior proof succeeded

Could you please re-review this version? If the paired CLI-entry and runtime-classification proof still does not meet the bar for an active shared caller, I will close the PR rather than broaden the patch further.

@clawsweeper re-review

clawsweeper · 2026-07-10T02:55:09Z

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steipete · 2026-07-10T05:54:11Z

Fixed and landed via #103410 as 120385a.

GitHub rejected the maintainer rebase/push because the generated createCommitOnBranch payload exceeded its 45 MB limit, even though Allow edits by maintainers was already enabled. I therefore recreated the patch on a maintainer branch, added the broader URL/path regression coverage, and preserved @VectorPeak's Co-authored-by credit.

The replacement passed 246 focused tests, the changed gate, exact-head CI, and a real loopback before/after check. Thank you, @VectorPeak, for finding and fixing this.

Closing this original PR as superseded by the landed replacement.

fix(media-core): detect MIME from encoded URL extensions

927146d

Co-authored-by: chatgpt-codex-connector[bot] <199175422+chatgpt-codex-connector[bot]@users.noreply.github.com>

openclaw-barnacle Bot added the size: XS label Jul 9, 2026

VectorPeak and others added 2 commits July 9, 2026 18:31

Merge branch 'main' into fix/media-core-encoded-url-extension

bf83aff

vincentkoc self-assigned this Jul 9, 2026

Merge branch 'main' into fix/media-core-encoded-url-extension

f25ad25

Merge branch 'main' into fix/media-core-encoded-url-extension

5bde183

Merge branch 'main' into fix/media-core-encoded-url-extension

54f63f5

clawsweeper Bot added rating: 🐚 platinum hermit Good normal PR readiness with ordinary maintainer review expected. and removed rating: 🦐 gold shrimp Decent PR readiness signal, but merge confidence is limited. labels Jul 9, 2026

VectorPeak and others added 2 commits July 9, 2026 20:51

Merge branch 'main' into fix/media-core-encoded-url-extension

043c744

fix(media-core): tighten encoded URL filename contracts

e636817

openclaw-barnacle Bot added cli CLI command changes size: S and removed size: XS labels Jul 10, 2026

steipete mentioned this pull request Jul 10, 2026

fix(media-core): detect MIME from encoded URL extensions #103410

Merged

steipete closed this Jul 10, 2026

steipete mentioned this pull request Jul 10, 2026

fix(ui): detect encoded media URL extensions #103466

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