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Merged
rcholic merged 1 commit into from
Jan 6, 2026
Merged

Sync Extension: v2.2.0 #121

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310 changes: 86 additions & 224 deletions sentience/extension/background.js
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Original file line number Diff line number Diff line change
@@ -1,242 +1,104 @@
// Sentience Chrome Extension - Background Service Worker
// Auto-generated from modular source
import init, { analyze_page_with_options, analyze_page, prune_for_api } from '../pkg/sentience_core.js';
import init, { analyze_page_with_options, analyze_page, prune_for_api } from "../pkg/sentience_core.js";

// background.js - Service Worker with WASM (CSP-Immune!)
// This runs in an isolated environment, completely immune to page CSP policies
let wasmReady = !1, wasmInitPromise = null;


console.log('[Sentience Background] Initializing...');

// Global WASM initialization state
let wasmReady = false;
let wasmInitPromise = null;

/**
* Initialize WASM module - called once on service worker startup
* Uses static imports (not dynamic import()) which is required for Service Workers
*/
async function initWASM() {
if (wasmReady) return;
if (wasmInitPromise) return wasmInitPromise;
if (!wasmReady) return wasmInitPromise || (wasmInitPromise = (async () => {
try {
globalThis.js_click_element = () => {}, await init(), wasmReady = !0;
} catch (error) {
throw error;
}
})(), wasmInitPromise);
}

wasmInitPromise = (async () => {
async function handleScreenshotCapture(_tabId, options = {}) {
try {
console.log('[Sentience Background] Loading WASM module...');

// Define the js_click_element function that WASM expects
// In Service Workers, use 'globalThis' instead of 'window'
// In background context, we can't actually click, so we log a warning
globalThis.js_click_element = () => {
console.warn('[Sentience Background] js_click_element called in background (ignored)');
};

// Initialize WASM - this calls the init() function from the static import
// The init() function handles fetching and instantiating the .wasm file
await init();

wasmReady = true;
console.log('[Sentience Background] ✓ WASM ready!');
console.log(
'[Sentience Background] Available functions: analyze_page, analyze_page_with_options, prune_for_api'
);
const {format: format = "png", quality: quality = 90} = options;
return await chrome.tabs.captureVisibleTab(null, {
format: format,
quality: quality
});
} catch (error) {
console.error('[Sentience Background] WASM initialization failed:', error);
throw error;
throw new Error(`Failed to capture screenshot: ${error.message}`);
}
})();

return wasmInitPromise;
}

// Initialize WASM on service worker startup
initWASM().catch((err) => {
console.error('[Sentience Background] Failed to initialize WASM:', err);
});

/**
* Message handler for all extension communication
* Includes global error handling to prevent extension crashes
*/
chrome.runtime.onMessage.addListener((request, sender, sendResponse) => {
// Global error handler to prevent extension crashes
try {
// Handle screenshot requests (existing functionality)
if (request.action === 'captureScreenshot') {
handleScreenshotCapture(sender.tab.id, request.options)
.then((screenshot) => {
sendResponse({ success: true, screenshot });
})
.catch((error) => {
console.error('[Sentience Background] Screenshot capture failed:', error);
sendResponse({
success: false,
error: error.message || 'Screenshot capture failed',
});
});
return true; // Async response
}

// Handle WASM processing requests (NEW!)
if (request.action === 'processSnapshot') {
handleSnapshotProcessing(request.rawData, request.options)
.then((result) => {
sendResponse({ success: true, result });
})
.catch((error) => {
console.error('[Sentience Background] Snapshot processing failed:', error);
sendResponse({
success: false,
error: error.message || 'Snapshot processing failed',
});
});
return true; // Async response
}

// Unknown action
console.warn('[Sentience Background] Unknown action:', request.action);
sendResponse({ success: false, error: 'Unknown action' });
return false;
} catch (error) {
// Catch any synchronous errors that might crash the extension
console.error('[Sentience Background] Fatal error in message handler:', error);
try {
sendResponse({
success: false,
error: `Fatal error: ${error.message || 'Unknown error'}`,
});
} catch (e) {
// If sendResponse already called, ignore
}
return false;
}
});

/**
* Handle screenshot capture (existing functionality)
*/
async function handleScreenshotCapture(_tabId, options = {}) {
try {
const { format = 'png', quality = 90 } = options;

const dataUrl = await chrome.tabs.captureVisibleTab(null, {
format,
quality,
});

console.log(
`[Sentience Background] Screenshot captured: ${format}, size: ${dataUrl.length} bytes`
);
return dataUrl;
} catch (error) {
console.error('[Sentience Background] Screenshot error:', error);
throw new Error(`Failed to capture screenshot: ${error.message}`);
}
}

/**
* Handle snapshot processing with WASM (NEW!)
* This is where the magic happens - completely CSP-immune!
* Includes safeguards to prevent crashes and hangs.
*
* @param {Array} rawData - Raw element data from injected_api.js
* @param {Object} options - Snapshot options (limit, filter, etc.)
* @returns {Promise<Object>} Processed snapshot result
*/
async function handleSnapshotProcessing(rawData, options = {}) {
const MAX_ELEMENTS = 10000; // Safety limit to prevent hangs
const startTime = performance.now();

try {
// Safety check: limit element count to prevent hangs
if (!Array.isArray(rawData)) {
throw new Error('rawData must be an array');
}

if (rawData.length > MAX_ELEMENTS) {
console.warn(
`[Sentience Background] ⚠️ Large dataset: ${rawData.length} elements. Limiting to ${MAX_ELEMENTS} to prevent hangs.`
);
rawData = rawData.slice(0, MAX_ELEMENTS);
}

// Ensure WASM is initialized
await initWASM();
if (!wasmReady) {
throw new Error('WASM module not initialized');
}

console.log(
`[Sentience Background] Processing ${rawData.length} elements with options:`,
options
);

// Run WASM processing using the imported functions directly
// Wrap in try-catch with timeout protection
let analyzedElements;
const startTime = performance.now();
try {
// Use a timeout wrapper to prevent infinite hangs
const wasmPromise = new Promise((resolve, reject) => {
if (!Array.isArray(rawData)) throw new Error("rawData must be an array");
if (rawData.length > 1e4 && (rawData = rawData.slice(0, 1e4)), await initWASM(),
!wasmReady) throw new Error("WASM module not initialized");
let analyzedElements, prunedRawData;
try {
let result;
if (options.limit || options.filter) {
result = analyze_page_with_options(rawData, options);
} else {
result = analyze_page(rawData);
}
resolve(result);
const wasmPromise = new Promise((resolve, reject) => {
try {
let result;
result = options.limit || options.filter ? analyze_page_with_options(rawData, options) : analyze_page(rawData),
resolve(result);
} catch (e) {
reject(e);
}
});
analyzedElements = await Promise.race([ wasmPromise, new Promise((_, reject) => setTimeout(() => reject(new Error("WASM processing timeout (>18s)")), 18e3)) ]);
} catch (e) {
reject(e);
const errorMsg = e.message || "Unknown WASM error";
throw new Error(`WASM analyze_page failed: ${errorMsg}`);
}
});

// Add timeout protection (18 seconds - less than content.js timeout)
analyzedElements = await Promise.race([
wasmPromise,
new Promise((_, reject) =>
setTimeout(() => reject(new Error('WASM processing timeout (>18s)')), 18000)
),
]);
} catch (e) {
const errorMsg = e.message || 'Unknown WASM error';
console.error(`[Sentience Background] WASM analyze_page failed: ${errorMsg}`, e);
throw new Error(`WASM analyze_page failed: ${errorMsg}`);
try {
prunedRawData = prune_for_api(rawData);
} catch (e) {
prunedRawData = rawData;
}
performance.now();
return {
elements: analyzedElements,
raw_elements: prunedRawData
};
} catch (error) {
performance.now();
throw error;
}
}

// Prune elements for API (prevents 413 errors on large sites)
let prunedRawData;
initWASM().catch(err => {}), chrome.runtime.onMessage.addListener((request, sender, sendResponse) => {
try {
prunedRawData = prune_for_api(rawData);
} catch (e) {
console.warn('[Sentience Background] prune_for_api failed, using original data:', e);
prunedRawData = rawData;
return "captureScreenshot" === request.action ? (handleScreenshotCapture(sender.tab.id, request.options).then(screenshot => {
sendResponse({
success: !0,
screenshot: screenshot
});
}).catch(error => {
sendResponse({
success: !1,
error: error.message || "Screenshot capture failed"
});
}), !0) : "processSnapshot" === request.action ? (handleSnapshotProcessing(request.rawData, request.options).then(result => {
sendResponse({
success: !0,
result: result
});
}).catch(error => {
sendResponse({
success: !1,
error: error.message || "Snapshot processing failed"
});
}), !0) : (sendResponse({
success: !1,
error: "Unknown action"
}), !1);
} catch (error) {
try {
sendResponse({
success: !1,
error: `Fatal error: ${error.message || "Unknown error"}`
});
} catch (e) {}
return !1;
}

const duration = performance.now() - startTime;
console.log(
`[Sentience Background] ✓ Processed: ${analyzedElements.length} analyzed, ${prunedRawData.length} pruned (${duration.toFixed(1)}ms)`
);

return {
elements: analyzedElements,
raw_elements: prunedRawData,
};
} catch (error) {
const duration = performance.now() - startTime;
console.error(`[Sentience Background] Processing error after ${duration.toFixed(1)}ms:`, error);
throw error;
}
}

console.log('[Sentience Background] Service worker ready');

// Global error handlers to prevent extension crashes
self.addEventListener('error', (event) => {
console.error('[Sentience Background] Global error caught:', event.error);
event.preventDefault(); // Prevent extension crash
});

self.addEventListener('unhandledrejection', (event) => {
console.error('[Sentience Background] Unhandled promise rejection:', event.reason);
event.preventDefault(); // Prevent extension crash
});
}), self.addEventListener("error", event => {
event.preventDefault();
}), self.addEventListener("unhandledrejection", event => {
event.preventDefault();
});
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