build(extension): add TARGET-driven dual builds with Firefox manifest #2000
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,59 @@ | ||
| { | ||
| "manifest_version": 3, | ||
| "name": "Cap - Screen Recorder & Screen Capture", | ||
| "short_name": "Cap", | ||
| "description": "Free, open source screen recorder. Capture your screen, camera & mic in Firefox and share a video link the moment you stop.", | ||
| "version": "1.0.3", | ||
| "homepage_url": "https://cap.so", | ||
| "browser_specific_settings": { | ||
| "gecko": { | ||
| "id": "extension@cap.so", | ||
| "strict_min_version": "128.0", | ||
| "data_collection_permissions": { | ||
| "required": ["authenticationInfo", "websiteContent"] | ||
| } | ||
| } | ||
| }, | ||
| "icons": { | ||
| "16": "icons/icon-16.png", | ||
| "32": "icons/icon-32.png", | ||
| "48": "icons/icon-48.png", | ||
| "128": "icons/icon-128.png" | ||
| }, | ||
| "action": { | ||
| "default_title": "Record your screen with Cap", | ||
| "default_icon": { | ||
| "16": "icons/icon-16.png", | ||
| "32": "icons/icon-32.png", | ||
| "48": "icons/icon-48.png", | ||
| "128": "icons/icon-128.png" | ||
| } | ||
| }, | ||
| "background": { | ||
| "scripts": ["assets/service-worker.js"], | ||
| "type": "module" | ||
| }, | ||
| "options_ui": { | ||
| "page": "options.html", | ||
| "open_in_tab": true | ||
| }, | ||
| "permissions": ["activeTab", "identity", "scripting", "storage"], | ||
| "host_permissions": ["http://*/*", "https://*/*", "file:///*"], | ||
| "content_scripts": [ | ||
| { | ||
| "matches": ["http://*/*", "https://*/*", "file:///*"], | ||
| "js": ["assets/content-bootstrap.js"], | ||
| "run_at": "document_idle" | ||
| } | ||
| ], | ||
| "web_accessible_resources": [ | ||
| { | ||
| "resources": ["icons/*", "content/overlay.js", "welcome.html"], | ||
| "matches": ["http://*/*", "https://*/*", "file:///*"] | ||
| }, | ||
| { | ||
| "resources": ["camera-preview.html", "popup.html"], | ||
| "matches": ["http://*/*", "https://*/*", "file:///*"] | ||
| } | ||
| ] | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -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], | ||
| }, | ||
|
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The shared background script imports this helper for both targets, but Prompt To Fix With AIThis is a comment left during a code review.
Path: apps/chrome-extension/src/background/recorder-host.ts
Line: 9-16
Comment:
**Firefox Reaches Offscreen APIs**
The shared background script imports this helper for both targets, but `hasRecorderHost()` and `ensureRecorderHost()` call Chrome-only offscreen APIs without checking the target. In the Firefox build, normal paths like starting a recording, probing the mic, enumerating devices, or connecting camera preview can reach `chrome.runtime.getContexts` or `chrome.offscreen.createDocument`, producing a runtime error instead of opening a Firefox recorder page.
How can I resolve this? If you propose a fix, please make it concise. |
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| (contexts) => resolve(contexts), | ||
| ); | ||
| }); | ||
| }; | ||
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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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This file assumes
chrome.runtime.getContexts+chrome.offscreen.createDocumentexist. Since this PR adds a Firefox build (and the manifest drops theoffscreenpermission), it might be worth adding a Firefox-specific implementation here (or at least a feature-detect + clearer error) sosendOffscreen(...)doesn’t end up throwing aTypeErrorat runtime.