refactor(extension): extract target-neutral recorder host and platform layer #1998
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| Original file line number | Diff line number | Diff line change | ||||
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| @@ -0,0 +1,59 @@ | ||||||
| // The recorder document (recorder.html) hosts capture, upload, device | ||||||
| // enumeration, the mic probe and the camera-preview relay. On Chrome it runs | ||||||
| // as an offscreen document; this module owns its lifecycle so the rest of the | ||||||
| // service worker never touches chrome.offscreen directly. | ||||||
| export const RECORDER_URL = "recorder.html"; | ||||||
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| let recorderDocumentCreation: Promise<void> | null = null; | ||||||
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| const getRecorderContexts = async () => { | ||||||
| const recorderUrl = chrome.runtime.getURL(RECORDER_URL); | ||||||
| return new Promise<Array<{ documentUrl?: string }>>((resolve) => { | ||||||
| chrome.runtime.getContexts( | ||||||
| { | ||||||
| contextTypes: [chrome.runtime.ContextType.OFFSCREEN_DOCUMENT], | ||||||
| documentUrls: [recorderUrl], | ||||||
| }, | ||||||
| (contexts) => resolve(contexts), | ||||||
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| ); | ||||||
| }); | ||||||
| }; | ||||||
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| export const hasRecorderHost = async () => | ||||||
| (await getRecorderContexts()).length > 0; | ||||||
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| const createOffscreenDocument = () => | ||||||
| new Promise<void>((resolve, reject) => { | ||||||
| chrome.offscreen.createDocument( | ||||||
| { | ||||||
| url: RECORDER_URL, | ||||||
| reasons: ["USER_MEDIA", "DISPLAY_MEDIA", "BLOBS", "AUDIO_PLAYBACK"], | ||||||
| justification: "Record and upload Cap videos from an extension page.", | ||||||
| }, | ||||||
| () => { | ||||||
| const error = chrome.runtime.lastError; | ||||||
| if (!error) { | ||||||
| resolve(); | ||||||
| return; | ||||||
| } | ||||||
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| const message = error.message ?? "Failed to create offscreen document"; | ||||||
| if (message.toLowerCase().includes("single offscreen document")) { | ||||||
| resolve(); | ||||||
| return; | ||||||
| } | ||||||
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| reject(new Error(message)); | ||||||
| }, | ||||||
| ); | ||||||
| }); | ||||||
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| export const ensureRecorderHost = async () => { | ||||||
| const contexts = await getRecorderContexts(); | ||||||
| if (contexts.length > 0) return; | ||||||
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| recorderDocumentCreation ??= createOffscreenDocument().finally(() => { | ||||||
| recorderDocumentCreation = null; | ||||||
| }); | ||||||
| await recorderDocumentCreation; | ||||||
| }; | ||||||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,14 @@ | ||
| import { TARGET } from "./target"; | ||
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| // Per-target feature availability. Firefox has no chrome.offscreen or | ||
| // chrome.tabCapture, its getDisplayMedia exposes no system audio or per-tab | ||
| // surface, MV3 host permissions are user-grantable rather than granted at | ||
| // install, and getDisplayMedia requires transient user activation so capture | ||
| // cannot start without a click inside the recorder document. | ||
| export const capabilities = { | ||
| supportsTabCapture: TARGET === "chrome", | ||
| supportsOffscreen: TARGET === "chrome", | ||
| supportsSystemAudioCapture: TARGET === "chrome", | ||
| hostPermissionsGrantedAtInstall: TARGET === "chrome", | ||
| recorderNeedsUserGesture: TARGET === "firefox", | ||
| } as const; |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,4 @@ | ||
| // "chrome-extension:" on Chromium, "moz-extension:" on Firefox. Sender checks | ||
| // must use this instead of a hardcoded literal or Firefox extension pages get | ||
| // misclassified as web pages. | ||
| export const EXTENSION_PROTOCOL = new URL(chrome.runtime.getURL("")).protocol; |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,8 @@ | ||
| // Injected by vite `define` per build target; undefined under vitest, which | ||
| // runs without a define and must behave like the Chrome build. | ||
| declare const __TARGET__: "chrome" | "firefox" | undefined; | ||
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| export type ExtensionTarget = "chrome" | "firefox"; | ||
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| export const TARGET: ExtensionTarget = | ||
| typeof __TARGET__ === "undefined" ? "chrome" : __TARGET__; | ||
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Prompt To Fix With AIThis is a comment left during a code review.
Path: apps/chrome-extension/src/platform/target.ts
Line: 8
Comment:
**Missing Target Becomes Chrome**
`TARGET` defaults to `"chrome"` whenever `__TARGET__` is absent, but the changed Vite config does not define `__TARGET__`. A Firefox build that uses this config without an injected define will enable Chrome-only capabilities like offscreen and tab capture, sending the Firefox worker into unsupported APIs.
How can I resolve this? If you propose a fix, please make it concise. |
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recorder-host.tsis imported by the service worker at module load time, but this line readschrome.runtime.ContextType.OFFSCREEN_DOCUMENTbefore any capability guard can run. In a Firefox build where that Chrome-only API is missing, the background worker can throw during startup instead of reaching thesupportsOffscreenchecks.Prompt To Fix With AI