fix(darwin): honour Permissions for media capture requests - #6050
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Included review availability: Your plan provides up to 10 included reviews per hour; 8 remain after this review. WalkthroughmacOS WebKit now handles ChangesmacOS media capture permissions
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: 🔵 Low · up to When a window is configured to allow camera or microphone access, any content loaded in that window can receive the automatic decision regardless of its origin. This could expose media access if the window displays untrusted or compromised content; the PR is otherwise mergeable with explicit owner awareness about this policy scope. Sequence Diagram(s)sequenceDiagram
participant WKUIDelegate
participant GoPermissionResolver
participant decisionHandler
WKUIDelegate->>GoPermissionResolver: resolve window camera and microphone permissions
GoPermissionResolver-->>WKUIDelegate: return grant, prompt, or deny
WKUIDelegate->>decisionHandler: pass WKPermissionDecision
Suggested reviewers: Poem
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✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 75.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 4 functions across 1 files. (2 skipped: 2 unsupported.) Full details: Description checkExplanation The description provides the change summary, motivation, behavior details, testing status, platform limitations, configuration information, and checklist results. It also explains why no issue link, macOS test, or additional tests are provided.
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Actionable comments posted: 2
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Inline comments:
In `@v3/pkg/application/permissions_darwin.go`:
- Around line 22-26: Update the duplicated comments in
v3/pkg/application/permissions_darwin.go lines 22-26 and
v3/pkg/application/webview_window_darwin.m lines 1010-1014 to state that the
implemented callback overrides WebKit’s unimplemented-delegate default of
WKPermissionDecisionPrompt and passes the window’s configured Permissions
decision to decisionHandler; make no code changes.
In `@v3/UNRELEASED_CHANGELOG.md`:
- Line 26: Update the changelog entry to state that getUserMedia failures are
fixed on macOS 12 and later rather than on macOS generally, and retain the
prerequisites for NSCameraUsageDescription, NSMicrophoneUsageDescription, and
the sandbox entitlement.
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v3/UNRELEASED_CHANGELOG.mdv3/pkg/application/permissions_darwin.gov3/pkg/application/webview_window_darwin.m
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The cross-platform Permissions option has no effect on macOS. It is honoured on Linux since wailsapp#5552 and on Windows through WebView2, but WebviewWindowDelegate — which is set as the webview's UI delegate — does not implement webView:requestMediaCapturePermissionForOrigin:initiatedByFrame:type:decisionHandler:, so nothing on that platform ever consults it. Left unimplemented, WebKit takes the request's default action, which on Cocoa is promptForGetUserMedia. Capture therefore works, but macOS behaves as though the option were permanently PermissionDefault: PermissionAllow and PermissionDeny are silently ignored. Implementing the delegate against the same option gives them their meaning there. PermissionDefault maps to WKPermissionDecisionPrompt, which is the behaviour that was already in place, so nothing changes for a window that does not configure the option. A request for the camera and the microphone together gets one answer, no more permissive than either half on its own. Permission and WKPermissionDecision happen to agree case for case. The mapping is still written out rather than cast: an agreement between two unrelated ABIs is not something to build on. The delegate method is macOS 12+, so it carries API_AVAILABLE and is never called below that.
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Both findings were right. Thanks — the first one was load-bearing and I had it backwards. On the WebKit fallback. I claimed WebKit denies a capture request when the delegate method is unimplemented. It does not. void UserMediaPermissionRequestProxy::doDefaultAction()
{
#if ENABLE(MEDIA_STREAM) && PLATFORM(COCOA)
if (requiresDisplayCapture())
promptForGetDisplayMedia(UserMediaDisplayCapturePromptType::UserChoose);
else
promptForGetUserMedia();
#else
deny();
#endif
}
That changes what this PR is. The code did not need to change — the mapping was already right — but the reasoning around it did. I have rewritten the comments in both files, the commit message, the changelog entry and the PR description, and force-pushed. On the changelog scope. Applied. It now reads:
One thing I withdrew on my own account. The first description speculated that the triage on #4270 might be incomplete, on the strength of the same wrong premise. It was not incomplete — @leaanthony's explanation holds, and I have removed that passage. Apologies for the noise. Standing caveat unchanged: I have no Mac and the Objective-C has never been compiled, only reviewed. Verification on macOS 12+ would still be very welcome. |
1 participant
Description
The cross-platform
Permissionsoption has no effect on macOS. It is honoured on Linux (#5552) and on Windows through WebView2, butWebviewWindowDelegate— which is set as the webview's UI delegate — does not implementwebView:requestMediaCapturePermissionForOrigin:initiatedByFrame:type:decisionHandler:, so nothing on that platform ever consults it.Left unimplemented, WebKit takes the request's default action, which on Cocoa is
promptForGetUserMedia(UserMediaPermissionRequestProxy::doDefaultAction). Capture therefore works today — but macOS behaves as though the option were permanentlyPermissionDefault, andPermissionAllowandPermissionDenyare silently ignored.Implementing the delegate against the same option gives them their meaning there:
PermissionPermissionDefaultWKPermissionDecisionPrompt— WebKit's own prompt, which is what already happens todayPermissionAllowWKPermissionDecisionGrantPermissionDenyWKPermissionDecisionDenySo a window that does not configure
Permissionsbehaves exactly as before.PermissionAllowis the case that matters in practice: for a window that only ever loads the app's own content, WebKit's prompt asks a question the user has already answered by clicking the button that calledgetUserMedia, and granting leaves just the one system prompt that actually gates the device.A request for the camera and the microphone together (
WKMediaCaptureTypeCameraAndMicrophone) gets a single answer, and it is no more permissive than either half on its own: deny beats prompt beats grant.Two notes on the implementation:
PermissionandWKPermissionDecisionhappen to agree case for case (0/1/2). The mapping is still written out rather than cast — an agreement between two unrelated ABIs is not something to build on.API_AVAILABLE(macos(12.0))and is never called below that. macOS 11 is unaffected.This does not replace
NSCameraUsageDescription/NSMicrophoneUsageDescription, or the sandbox'scom.apple.security.device.audio-input/.camerawhere an app is sandboxed. Those still gate the device; this only decides whether the request reaches them.Fixes # (no issue filed — found while adding voice recording to a Wails v3 app)
Related: #3735 is useful background on the
Info.plist/ entitlement side. #4270 is not fixed by this and I am not claiming it is — that report is aboutwails3 dev, and the triage there (an unbundled dev binary that TCC cannot attribute) is a separate problem with its own fix.Type of change
Please select the option that is relevant.
No WEP: this adds no public API and proposes no new behaviour.
Permissions,PermissionTypeandPermissionare all existing public API, and the default case is unchanged. Happy to convert it if you read it differently.How Has This Been Tested?
Not on macOS — I do not have Mac hardware, and I would rather say so than tick a box. Please treat the macOS column as unverified.
What I did verify, on Linux:
permissions_darwin.gowas temporarily retaggedlinux && cgo && !android && !serverand built as part ofpkg/application, which exercises the cgo signature, the*WebviewWindowcast and thePermissionslookup. Clean.gofmtclean, and the Linux and Windows paths are untouched.The Objective-C in
webview_window_darwin.mhas been reviewed but not compiled. The parts I would look at first are theAPI_AVAILABLE(macos(12.0))annotation against the file's-mmacosx-version-min=10.13deployment target, and theextern int resolveMediaCapturePermission(unsigned int, bool, bool);declaration matching what cgo generates.Linux: Debian 13, GTK 4.18.6, WebKitGTK 2.52.3 — only to confirm nothing regressed there, since this change does not touch Linux.
Test Configuration
wails doctoris not meaningful here — the change is verified by compilation rather than at runtime, and not on the platform it targets. Built with Go 1.25 againstmaster(f2260d1).Checklist:
website/src/pages/changelog.mdxwith details of this PR (v3 changelog entries are added automatically)On the unticked boxes:
CONTRIBUTING.mdasks forv3/UNRELEASED_CHANGELOG.mdto be updated by hand. I followed CONTRIBUTING and it is a separate commit — say the word and I will drop it.WKUIDelegatecallback in the repo, and the decision logic it calls is a few lines of Go. If you would likeresolveMediaCapturePermissionreachable from a plain Go test I am happy to split it so the policy half is testable without cgo.Permission's doc comment already describes macOS as presenting the system prompt, which is whatPermissionDefaultnow actually maps to.Edited: the first version of this description claimed WebKit denies capture when the delegate is unimplemented, and that
getUserMediatherefore never worked on macOS. That was wrong — @coderabbitai caught it.doDefaultActionprompts on Cocoa, and has done so at least as far back as the safari-613 branch. The fix is real but narrower than I first described, and I have corrected the code comments and the changelog entry to match.Summary by CodeRabbit
Bug Fixes
getUserMediasupport for camera and microphone access in web views.Documentation