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; 9 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 On macOS, PermissionAllow grants camera or microphone access to any content loaded in that window, so applications that display remote or otherwise untrusted content must treat the entire window as trusted or restrict navigation. Default and Deny behavior remain appropriately bounded, making the change mergeable with this security consideration understood. Sequence Diagram(s)sequenceDiagram
participant WKUIDelegate
participant resolveMediaCapturePermission
participant PermissionResolver
participant decisionHandler
WKUIDelegate->>resolveMediaCapturePermission: pass window ID and requested devices
resolveMediaCapturePermission->>PermissionResolver: resolve camera and microphone permissions
PermissionResolver-->>resolveMediaCapturePermission: return grant, prompt, or deny
resolveMediaCapturePermission-->>WKUIDelegate: return WKPermissionDecision
WKUIDelegate->>decisionHandler: pass the decision to WebKit
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🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 54.55% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 11 functions across 2 files. (2 skipped: 2 unsupported.) Full details: Description checkExplanation The description is complete and relevant. It explains the issue, implementation, behavior, compatibility, linked issue, documentation updates, testing scope, and checklist status. It also clearly states that macOS runtime testing was performed by a reviewer rather than the author.
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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. |
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The code looks right to me — built it on macOS 26.6/arm64, and the hand-written mapping matches The docs page for this option still says the feature doesn't exist. A test pinning No linked issue, so I opened #6067 if you want to |
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One more for the docs change, if you take it — on macOS, So Something like "set |
captureDecision is handed straight back to WebKit as a WKPermissionDecision, so its three cases have to keep agreeing with that enum numerically. That agreement is the whole reason the mapping is written out rather than cast, and nothing was holding it in place. Pin it, along with the combination rule for a request that asks for the camera and the microphone at once. resolveMediaCapturePermission is now only the cgo boundary; the decision it returns is ordinary Go, which is what the tests call. Claude-Session: https://claude.ai/code/session_01MeqJaNLYN4PADS7kiVCgYM
The permissions page still said the map was ignored on macOS, in four places: the platform section, the media capture pattern, the support matrix and the troubleshooting entry. macOS is now two layers rather than one, and that is the part worth being explicit about: the policy answers WKWebView's request, TCC still gates the device underneath it. PermissionAllow drops WebKit's prompt, not the system one, and no app can grant itself device access. The matrix reads like Linux now — camera and microphone handled, the other three not yet, since they have no WKUIDelegate equivalent. Also warns about the trap the map creates on macOS: a capability that reaches AVFoundation with no usage description string does not fail, it terminates the app. PermissionDefault is the zero value, so granting only the microphone leaves the camera on WebKit's prompt — which the user can accept. Claude-Session: https://claude.ai/code/session_01MeqJaNLYN4PADS7kiVCgYM
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Thanks — that is a thorough pass, and the docs gap was a fair block. All of it is in, in two commits on top of the two you reviewed. Docs. The macOS section is two layers now rather than one: the The Tests. To get the camera-and-microphone combination reachable from a plain Go test, I still cannot run them on macOS. They pass here, but by copying the test file and the non-cgo half of Template and issue. The body was on the template, but the documentation box genuinely was not ticked — that one and the tests box are now, and the description says No need to push the docs yourself. If the TCC-layering wording reads wrong to you on the rendered page, say so and I will take it. |
2 participants
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 #6067 — filed by @Grantmartin2002 in review. This was found while adding voice recording to a Wails v3 app and had no issue behind it until then.
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.Documentation
features/windows/permissions.mdxsaid the map was ignored on macOS, in four places — the platform section, the media-capture pattern, the support matrix and the troubleshooting entry. All four now describe the two layers: the policy answers WKWebView's request, and TCC still gates the device underneath it, soPermissionAllowdrops WebKit's prompt but not the system one. The matrix reads like Linux — camera and microphone ✅, the other three ❌ not yet, since they have noWKUIDelegateequivalent. Theid/translation is updated in the same commit, which is what the recent history of that tree does.The page also warns about a trap this option creates on macOS, which @Grantmartin2002 raised: a capability that reaches AVFoundation with no usage description string does not fail — the OS terminates the app.
PermissionDefaultis the zero value, so{PermissionMicrophone: PermissionAllow}on its own leaves the camera on WebKit's prompt, and an app declaring onlyNSMicrophoneUsageDescriptiondies if the user accepts it. The advice is to setPermissionDenyexplicitly for anything you have no usage string for.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.
@Grantmartin2002 has since reviewed it there and reports
go vet,go buildandgo test ./pkg/application/clean, theWKPermissionDecisioncases matching the SDK header, and no warnings from recompiling the.mat the package's 10.13 deployment target with-Wunguarded-availability-new.What I did verify, on Linux:
permissions_darwin_test.go(new) pinscaptureDecisionPrompt/Grant/Denyto 0/1/2 — that is the thing which makes the hand-written mapping safe rather than lucky. It also covers the strictest-wins rule from both argument orders, thePermission→ decision mapping, and the lookup: an unset entry, a window with no map at all, and a window the manager no longer knows about. Samedarwin && !ios && !servertags as the code it tests.permissions_darwin.gowere temporarily copied intopkg/applicationwithout the build tags and run on Linux against the realAppandWebviewWindow. All cases pass. The copies were then deleted — none of that is in the branch.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.@mdx-js/mdx), including the new<Aside>and the code block inside it.The Objective-C in
webview_window_darwin.mhas been reviewed but not compiled by me.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 — this is verified by compilation and unit tests rather than at runtime, and not on the platform it targets. Built 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.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
Summary by CodeRabbit
Bug Fixes
getUserMediasupport for camera and microphone access in web views on macOS 12 and later.Documentation