const TESTING = (typeof chrome === 'undefined'); const unix = { EPERM: 1, ENOENT: 2, ESRCH: 3, EINTR: 4, EIO: 5, ENXIO: 6, ENOTSUP: 45, // Unix file types S_IFMT: 0170000, // type of file mask S_IFIFO: 010000, // named pipe (fifo) S_IFCHR: 020000, // character special S_IFDIR: 040000, // directory S_IFBLK: 060000, // block special S_IFREG: 0100000, // regular S_IFLNK: 0120000, // symbolic link S_IFSOCK: 0140000, // socket } class UnixError extends Error { constructor(error) { super(); this.name = "UnixError"; this.error = error; } } // tabs/by-id/ID/title // tabs/by-id/ID/url // tabs/by-id/ID/console // tabs/by-id/ID/mem (?) // tabs/by-id/ID/cpu (?) // tabs/by-id/ID/screenshot.png // tabs/by-id/ID/text.txt // tabs/by-id/ID/printed.pdf // tabs/by-id/ID/control // tabs/by-id/ID/sources/ function pathComponent(path, i) { const components = path.split('/'); return components[i >= 0 ? i : components.length + i]; } function sanitize(s) { return s.replace(/[^A-Za-z0-9_\-\.]/gm, '_'); } function stringSize(str) { // returns the byte length of an utf8 string var s = str.length; for (var i=str.length-1; i>=0; i--) { var code = str.charCodeAt(i); if (code > 0x7f && code <= 0x7ff) s++; else if (code > 0x7ff && code <= 0xffff) s+=2; if (code >= 0xDC00 && code <= 0xDFFF) i--; //trail surrogate } return s + 1; } const debugging = {}; async function debugTab(tabId) { if (debugging[tabId]) { debugging[tabId] += 1; } else { await new Promise((resolve, reject) => chrome.debugger.attach({tabId}, "1.3", () => { if (chrome.runtime.lastError) { reject(chrome.runtime.lastError); } else { debugging[tabId] = 1; resolve(); } })); } } function sendDebuggerCommand(tabId, method, commandParams) { return new Promise((resolve, reject) => chrome.debugger.sendCommand({tabId}, method, commandParams, result => { console.log(method, result); if (result) { resolve(result); } else { reject(chrome.runtime.lastError); } }) ); } let lastFocusedWindowId; browser.windows.getLastFocused().then(window => { lastFocusedWindowId = window.id; }); browser.windows.onFocusChanged.addListener(windowId => { if (windowId !== -1) lastFocusedWindowId = windowId; }); /* if I could specify a custom editor interface for all the routing below ... I would highlight the route names in blocks of some color that sticks out, and let you collapse them. then you could get a view of what the whole filesystem looks like at a glance. */ const router = {}; function withTab(handler) { return { async getattr({path}) { const tab = await browser.tabs.get(parseInt(pathComponent(path, -2))); return { st_mode: unix.S_IFREG | 0444, st_nlink: 1, st_size: stringSize(handler(tab)) }; }, async open({path}) { return { fh: 0 }; }, async read({path, fh, size, offset}) { const tab = await browser.tabs.get(parseInt(pathComponent(path, -2))); return { buf: handler(tab).substr(offset, size) }; } }; } function fromScript(code) { return { async getattr({path}) { const tabId = parseInt(pathComponent(path, -2)); return { st_mode: unix.S_IFREG | 0444, st_nlink: 1, st_size: stringSize((await browser.tabs.executeScript(tabId, {code}))[0]) }; }, async open({path}) { return { fh: 0 }; }, async read({path, fh, size, offset}) { const tabId = parseInt(pathComponent(path, -2)); return { buf: (await browser.tabs.executeScript(tabId, {code}))[0] .substr(offset, size) } } }; } router["/tabs/by-id"] = { async readdir() { const tabs = await browser.tabs.query({}); return { entries: tabs.map(tab => String(tab.id)) }; } }; router["/tabs/by-id/*/url"] = withTab(tab => tab.url + "\n"); router["/tabs/by-id/*/title"] = withTab(tab => tab.title + "\n"); router["/tabs/by-id/*/text"] = fromScript(`document.body.innerText`); router["/tabs/by-id/*/screenshot.png"] = { async read({path, fh, size, offset}) { const tabId = parseInt(pathComponent(path, -2)); await debugTab(tabId); await sendDebuggerCommand(tabId, "Page.enable", {}); const {data} = await sendDebuggerCommand(tabId, "Page.captureScreenshot"); const arr = Uint8Array.from(atob(data), c => c.charCodeAt(0)); const slice = arr.slice(offset, offset + size); return { buf: String.fromCharCode(...slice) }; } }; router["/tabs/by-id/*/resources"] = { async opendir({path}) { const tabId = parseInt(pathComponent(path, -2)); await debugTab(tabId); return { fh: 0 }; }, async readdir({path}) { const tabId = parseInt(pathComponent(path, -2)); const {frameTree} = await sendDebuggerCommand(tabId, "Page.getResourceTree", {}); return { entries: frameTree.resources.map(r => sanitize(String(r.url).slice(0, 200))) }; } }; router["/tabs/by-id/*/resources/*"] = { async getattr({path}) { // FIXME: cache the file const tabId = parseInt(pathComponent(path, -3)); const suffix = pathComponent(path, -1); if (!debugging[tabId]) throw new UnixError(unix.EIO); await sendDebuggerCommand(tabId, "Page.enable", {}); const {frameTree} = await sendDebuggerCommand(tabId, "Page.getResourceTree", {}); for (let resource of frameTree.resources) { const resourceSuffix = sanitize(String(resource.url).slice(0, 200)); if (resourceSuffix === suffix) { let {base64Encoded, content} = await sendDebuggerCommand(tabId, "Page.getResourceContent", { frameId: frameTree.frame.id, url: resource.url }); if (base64Encoded) { content = atob(content); } return { st_mode: unix.S_IFREG | 0444, st_nlink: 1, st_size: stringSize(content) // FIXME }; } } }, async open({path}) { // FIXME: cache the file return {fh: 3}; }, async read({path, fh, size, offset}) { const tabId = parseInt(pathComponent(path, -3)); const suffix = pathComponent(path, -1); if (!debugging[tabId]) throw new UnixError(unix.EIO); await sendDebuggerCommand(tabId, "Page.enable", {}); const {frameTree} = await sendDebuggerCommand(tabId, "Page.getResourceTree", {}); for (let resource of frameTree.resources) { const resourceSuffix = sanitize(String(resource.url).slice(0, 200)); if (resourceSuffix === suffix) { let {base64Encoded, content} = await sendDebuggerCommand(tabId, "Page.getResourceContent", { frameId: frameTree.frame.id, url: resource.url }); if (base64Encoded) { const buf = btoa(atob(content).substr(offset, size)); return { buf, base64Encoded: true }; } return content.substr(offset, size); } } throw new UnixError(unix.ENOENT); }, async release({path, fh}) { return {}; } }; router["/tabs/by-id/*/control"] = { // echo remove >> mnt/tabs/by-id/1644/control async write({path, buf}) { const tabId = parseInt(pathComponent(path, -2)); const command = buf.trim(); // can use `discard`, `remove`, `reload`, `goForward`, `goBack`... // see https://developer.chrome.com/extensions/tabs await new Promise(resolve => chrome.tabs[command](tabId, resolve)); } }; router["/tabs/by-title"] = { async readdir() { const tabs = await browser.tabs.query({}); return { entries: tabs.map(tab => sanitize(String(tab.title).slice(0, 200)) + "_" + String(tab.id)) }; } }; router["/tabs/by-title/*"] = { // a symbolic link to /tabs/by-id/[id for this tab] async readlink({path}) { const parts = path.split("_"); const id = parts[parts.length - 1]; return { buf: "../by-id/" + id }; } }; router["/tabs/last-focused"] = { // a symbolic link to /tabs/by-id/[id for this tab] async readlink({path}) { const id = (await browser.tabs.query({ active: true, windowId: lastFocusedWindowId }))[0].id; return { buf: "by-id/" + id }; } } // Ensure that there are routes for all ancestors. This algorithm is // probably not correct, but whatever. I also think it would be // better to compute this stuff on the fly, so you could patch more // routes in at runtime, but I need to think a bit about how to make // that work with wildcards. for (let key in router) { let path = key; while (path !== "/") { // walk upward through the path path = path.substr(0, path.lastIndexOf("/")); if (path == '') path = '/'; if (!router[path]) { // find all direct children let children = Object.keys(router) .filter(k => k.startsWith(path) && (k.match(/\//g) || []).length === (path.match(/\//g) || []).length + 1) .map(k => k.substr((path === '/' ? 0 : path.length) + 1).split('/')[0]); children = [...new Set(children)]; router[path] = { readdir() { return { entries: children }; } }; } } } if (TESTING) { // I wish I could color this section with... a pink background, or something. const assert = require('assert'); (async () => { assert.deepEqual(await router['/tabs/by-id/*'].readdir(), ['url', 'title', 'text', 'control']); assert.deepEqual(await router['/'].readdir(), ['tabs']); assert.deepEqual(await router['/tabs'].readdir(), ['by-id', 'by-title']); assert.deepEqual(findRoute('/tabs/by-id/TABID/url'), router['/tabs/by-id/*/url']); })() } // fill in default implementations of fs ops for (let key in router) { // if readdir -> directory -> add getattr, opendir, releasedir if (router[key].readdir) { router[key] = { getattr() { return { st_mode: unix.S_IFDIR | 0755, st_nlink: 3, st_size: 0, }; }, opendir({path}) { return { fh: 0 }; }, releasedir({path}) { return {}; }, ...router[key] }; } else if (router[key].readlink) { router[key] = { async getattr({path}) { const st_size = (await this.readlink({path})).length + 1; return { st_mode: unix.S_IFLNK | 0444, st_nlink: 1, // You _must_ return correct linkee path length from getattr! st_size }; }, ...router[key] }; } else if (router[key].read || router[key].write) { router[key] = { async getattr() { return { st_mode: unix.S_IFREG | ((router[key].read && 0444) || (router[key].write && 0222)), st_nlink: 1, st_size: 100 // FIXME }; }, open() { return { fh: 0 }; }, release() { return {}; }, ...router[key] }; } } console.log(router); function findRoute(path) { let pathSegments = path.split("/"); if (pathSegments[pathSegments.length - 1].startsWith("._")) { throw new UnixError(unix.ENOTSUP); // Apple Double file for xattrs } let routingPath = ""; for (let segment of pathSegments) { if (routingPath === "/") { routingPath = ""; } if (router[routingPath + "/*"]) { routingPath += "/*"; } else if (router[routingPath + "/" + segment]) { routingPath += "/" + segment; } else { throw new UnixError(unix.ENOENT); } } return router[routingPath]; } let port; async function onMessage(req) { if (req.buf) req.buf = atob(req.buf); console.log('req', req); let response = { op: req.op, error: unix.EIO }; /* console.time(req.op + ':' + req.path);*/ try { response = await findRoute(req.path)[req.op](req); response.op = req.op; if (response.buf) response.buf = btoa(response.buf); } catch (e) { console.error(e); response = { op: req.op, error: e instanceof UnixError ? e.error : unix.EIO } } /* console.timeEnd(req.op + ':' + req.path);*/ console.log('resp', response); port.postMessage(response); }; function tryConnect() { port = chrome.runtime.connectNative('com.rsnous.tabfs'); port.onMessage.addListener(onMessage); port.onDisconnect.addListener(p => {console.log('disconnect', p)}); } if (!TESTING) { tryConnect(); }