76 lines
2.2 KiB
JavaScript
76 lines
2.2 KiB
JavaScript
/* global chrome */
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/**
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* msg_bridge.js — ISOLATED world message bridge
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*
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* Architecture:
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* background.js --chrome.tabs.sendMessage--> msg_bridge.js (ISOLATED)
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* |
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* window.postMessage
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* |
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* content.js (MAIN world, __AIRI_DG__)
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* |
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* window.postMessage (reply)
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* |
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* background.js <--sendResponse-- msg_bridge.js (ISOLATED)
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*
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* Why this bridge is needed:
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* - chrome.runtime.onMessage can only be received in the ISOLATED world
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* - window.__AIRI_DG__ lives in the MAIN world (needs real DOM access)
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* - The two worlds communicate via window.postMessage
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*
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* Adapted from an earlier Chrome extension message bridge.
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* No functional changes — this is a pure relay.
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*/
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(function () {
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'use strict'
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// Pending requests: reqId → { sendResponse, timer }
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const pending = new Map()
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let seqId = 0
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// Receive commands from background.js
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chrome.runtime.onMessage.addListener((msg, sender, sendResponse) => {
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if (msg.type !== 'CU_ACTION')
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return false
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const reqId = `__cu_req_${++seqId}`
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const { method, args } = msg
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// Set timeout
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const timer = setTimeout(() => {
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pending.delete(reqId)
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sendResponse({ success: false, error: 'timeout' })
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}, 8000)
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pending.set(reqId, { sendResponse, timer })
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// Send to MAIN world content.js
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window.postMessage({
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type: '__CU_CALL__',
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reqId,
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method,
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args: args || [],
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}, '*')
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return true // Keep sendResponse async
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})
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// Receive replies from MAIN world content.js
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window.addEventListener('message', (evt) => {
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if (evt.source !== window)
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return
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const data = evt.data
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if (!data || data.type !== '__CU_REPLY__')
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return
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const entry = pending.get(data.reqId)
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if (!entry)
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return
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pending.delete(data.reqId)
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clearTimeout(entry.timer)
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entry.sendResponse(data.result)
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})
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})()
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