const TESTING = (typeof chrome === 'undefined'); const unix = { EPERM: 1, ENOENT: 2, ESRCH: 3, EINTR: 4, EIO: 5, ENXIO: 6, ENOTSUP: 45, ETIMEDOUT: 110, // FIXME: not on macOS (?) // 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; } } 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, '_'); } const stringToUtf8Array = (function() { const encoder = new TextEncoder("utf-8"); return str => encoder.encode(str); })(); const utf8ArrayToString = (function() { const decoder = new TextDecoder("utf-8"); return utf8 => decoder.decode(utf8); })(); async function attachDebugger(tabId) { return new Promise((resolve, reject) => chrome.debugger.attach({tabId}, "1.3", () => { if (chrome.runtime.lastError) { reject(chrome.runtime.lastError); } else { resolve(); } })); } async function detachDebugger(tabId) { return new Promise((resolve, reject) => chrome.debugger.detach({tabId}, () => { if (chrome.runtime.lastError) { reject(chrome.runtime.lastError); } else { resolve(); } })); } const TabManager = { tabState: {}, // higher-level wrapper which avoids unnecessary attaches (do we need this?) debugTab: async function(tabId) { this.tabState[tabId] = this.tabState[tabId] || {}; if (this.tabState[tabId].debugging) { this.tabState[tabId].debugging += 1; } else { try { await attachDebugger(tabId); } catch (e) { if (e.message.indexOf('Another debugger is already attached') !== -1) { await detachDebugger(tabId); await attachDebugger(tabId); } } this.tabState[tabId].debugging = 1; } // FIXME: unsubscribe }, enableDomainForTab: async function(tabId, domain) { this.tabState[tabId] = this.tabState[tabId] || {}; if (this.tabState[tabId][domain]) { this.tabState[tabId][domain] += 1; } else { await sendDebuggerCommand(tabId, `${domain}.enable`, {}); this.tabState[tabId][domain] = 1; } } }; function sendDebuggerCommand(tabId, method, commandParams) { return new Promise((resolve, reject) => chrome.debugger.sendCommand({tabId}, method, commandParams, result => { if (result) { resolve(result); } else { reject(chrome.runtime.lastError); } }) ); } const BrowserState = { scriptsForTab: {} }; (function() { if (TESTING) return; chrome.debugger.onEvent.addListener((source, method, params) => { console.log(source, method, params); if (method === "Page.") { // we're gonna assume we're always plugged into both Page and Debugger. BrowserState.scriptsForTab[source.tabId] = []; } else if (method === "Debugger.scriptParsed") { BrowserState.scriptsForTab[source.tabId] = BrowserState.scriptsForTab[source.tabId] || []; BrowserState.scriptsForTab[source.tabId].push(params); // FIXME: clear these out when page changes in tab (how?) } }); })(); const router = {}; const Cache = { // used when you open a file to cache the content we got from the // browser until you close that file. (so we can respond to // individual chunk read() and write() requests without doing a // whole new conversation with the browser and regenerating the // content -- important for taking a screenshot, for instance) store: {}, nextHandle: 0, storeObject(object) { const handle = ++this.nextHandle; this.store[handle] = object; return handle; }, getObjectForHandle(handle) { return this.store[handle]; }, removeObjectForHandle(handle) { delete this.store[handle]; } }; function toUtf8Array(stringOrArray) { if (typeof stringOrArray == 'string') { return stringToUtf8Array(stringOrArray); } else { return stringOrArray; } } const defineFile = (getData, setData) => ({ // Generates a full set of file operations (so clients can read and // write sections of the file, stat it to get its size and see it // show up in ls, etc), given getData and setData functions that // define the contents of the entire file. // getData: (path: String) -> Promise // setData [optional]: (path: String, newContentsOfFile: String) -> Promise<> // You can override file operations (like `truncate` or `getattr`) // in the returned set if you want different behavior from what's // defined here. async getattr({path}) { return { st_mode: unix.S_IFREG | 0444 | (setData ? 0222 : 0), st_nlink: 1, // you'll want to override this if getData() is slow, because // getattr() gets called a lot more cavalierly than open(). st_size: toUtf8Array(await getData(path)).length }; }, // We call getData() once when the file is opened, then cache that // data for all subsequent reads from that application. async open({path}) { return { fh: Cache.storeObject(toUtf8Array(await getData(path))) }; }, async read({path, fh, size, offset}) { return { buf: String.fromCharCode(...Cache.getObjectForHandle(fh).slice(offset, offset + size)) } }, async write({path, fh, offset, buf}) { let arr = Cache.getObjectForHandle(fh); const bufarr = stringToUtf8Array(buf); if (offset + bufarr.length > arr.length) { const newArr = new Uint8Array(offset + bufarr.length); newArr.set(arr); arr = newArr; } for (let i = 0; i < bufarr.length; i++) { arr[offset + i] = bufarr[i]; } // I guess caller should override write() if they want to actually // patch and not just re-set the whole string (for example, // if they want to hot-reload just one function the user modified) await setData(path, utf8ArrayToString(arr)); return { size: bufarr.length }; }, async release({fh}) { Cache.removeObjectForHandle(fh); return {}; }, async truncate({path, size}) { // TODO: weird case if they truncate while the file is open // (but `echo hi > foo.txt`, the main thing I care about, uses // O_TRUNC which thankfully doesn't do that) let arr = toUtf8Array(await getData(path)); if (size > arr.length) { const newArr = new Uint8Array(size); newArr.set(arr); arr = newArr; } await setData(path, utf8ArrayToString(arr.slice(0, size))); return {}; } }); router["/tabs/create"] = { async write({path, buf}) { const url = buf.trim(); await browser.tabs.create({url}); return {size: stringToUtf8Array(buf).length}; }, async truncate({path, size}) { return {}; } } router["/tabs/by-id"] = { async readdir() { const tabs = await browser.tabs.query({}); return { entries: [".", "..", ...tabs.map(tab => String(tab.id))] }; } }; // title.txt // url.txt // text.txt // TODO: document.html // eval-in // eval-out // TODO: mem (?) // TODO: cpu (?) // TODO: dom/ ? // TODO: globals/ ? // screenshot.png (FIXME: how to keep from blocking when unfocused?) // TODO: archive.mhtml ? // TODO: printed.pdf // control // there's a question about whether to do stuff through injected // JavaScript or through the devtools API. (function() { const withTab = (readHandler, writeHandler) => defineFile(async path => { const tabId = parseInt(pathComponent(path, -2)); const tab = await browser.tabs.get(tabId); return readHandler(tab); }, writeHandler ? async (path, buf) => { const tabId = parseInt(pathComponent(path, -2)); await browser.tabs.update(tabId, writeHandler(buf)); } : undefined); const fromScript = code => defineFile(async path => { const tabId = parseInt(pathComponent(path, -2)); return (await browser.tabs.executeScript(tabId, {code}))[0]; }); router["/tabs/by-id/*/url.txt"] = withTab(tab => tab.url + "\n", buf => ({ url: buf })); router["/tabs/by-id/*/title.txt"] = withTab(tab => tab.title + "\n"); router["/tabs/by-id/*/text.txt"] = fromScript(`document.body.innerText`); })(); 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 browser.tabs[command](tabId); return {size: stringToUtf8Array(buf).length}; }, async truncate({path, size}) { return {}; } }; // debugger/ : debugger-API-dependent (Chrome-only) (function() { // console // resources/ // TODO: scripts/ TODO: allow creation, eval immediately router["/tabs/by-id/*/debugger/resources"] = { async readdir({path}) { const tabId = parseInt(pathComponent(path, -3)); await TabManager.debugTab(tabId); await TabManager.enableDomainForTab(tabId, "Page"); const {frameTree} = await sendDebuggerCommand(tabId, "Page.getResourceTree", {}); return { entries: [".", "..", ...frameTree.resources.map(r => sanitize(String(r.url).slice(0, 200)))] }; } }; router["/tabs/by-id/*/debugger/resources/*"] = defineFile(async path => { const [tabId, suffix] = [parseInt(pathComponent(path, -4)), pathComponent(path, -1)]; await TabManager.debugTab(tabId); await TabManager.enableDomainForTab(tabId, "Page"); 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) { return Uint8Array.from(atob(content), c => c.charCodeAt(0)); } return content; } } throw new UnixError(unix.ENOENT); }); router["/tabs/by-id/*/debugger/scripts"] = { async opendir({path}) { const tabId = parseInt(pathComponent(path, -3)); await TabManager.debugTab(tabId); await TabManager.enableDomainForTab(tabId, "Debugger"); return { fh: 0 }; }, async readdir({path}) { const tabId = parseInt(pathComponent(path, -3)); return { entries: [".", "..", ...BrowserState.scriptsForTab[tabId].map(params => sanitize(params.url).slice(0, 200) + "_" + params.scriptId)] }; } }; router["/tabs/by-id/*/debugger/scripts/*"] = defineFile(async path => { const [tabId, suffix] = [parseInt(pathComponent(path, -4)), pathComponent(path, -1)]; await TabManager.debugTab(tabId); await TabManager.enableDomainForTab(tabId, "Page"); await TabManager.enableDomainForTab(tabId, "Debugger"); const parts = path.split("_"); const scriptId = parts[parts.length - 1]; const {scriptSource} = await sendDebuggerCommand(tabId, "Debugger.getScriptSource", {scriptId}); return scriptSource; }, async (path, buf) => { const [tabId, suffix] = [parseInt(pathComponent(path, -4)), pathComponent(path, -1)]; await TabManager.debugTab(tabId); await TabManager.enableDomainForTab(tabId, "Debugger"); const parts = path.split("_"); const scriptId = parts[parts.length - 1]; await sendDebuggerCommand(tabId, "Debugger.setScriptSource", {scriptId, scriptSource: buf}); }); })(); router["/tabs/by-title"] = { getattr() { return { st_mode: unix.S_IFDIR | 0777, // writable st_nlink: 3, st_size: 0, }; }, 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 tabId = parts[parts.length - 1]; return { buf: "../by-id/" + tabId }; }, async unlink({path}) { // you can delete a by-title/TAB to close that tab const parts = path.split("_"); const tabId = parseInt(parts[parts.length - 1]); await browser.tabs.remove(tabId); return {}; } }; 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, lastFocusedWindow: true }))[0].id; return { buf: "by-id/" + id }; } }; router["/windows"] = { async readdir() { const windows = await browser.windows.getAll(); return { entries: [".", "..", ...windows.map(window => String(window.id))] }; } }; router["/windows/last-focused"] = { // a symbolic link to /windows/[id for this window] async readlink({path}) { const windowId = (await browser.windows.getLastFocused()).id; return { buf: windowId }; } }; router["/windows/*/visible-tab.png"] = { ...defineFile(async path => { const windowId = parseInt(pathComponent(path, -2)); const dataUrl = await browser.tabs.captureVisibleTab(windowId, {format: 'png'}); return Uint8Array.from(atob(dataUrl.substr(("data:image/png;base64,").length)), c => c.charCodeAt(0)); }), async getattr({path}) { return { st_mode: unix.S_IFREG | 0444, st_nlink: 1, st_size: 10000000 // hard-code to 10MB for now }; } }; router["/extensions"] = { async readdir() { const infos = await browser.management.getAll(); return { entries: [".", "..", ...infos.map(info => `${sanitize(info.name)}_${info.id}`)] }; } }; router["/extensions/*/enabled"] = { ...defineFile(async path => { const parts = pathComponent(path, -2).split('_'); const extensionId = parts[parts.length - 1]; const info = await browser.management.get(extensionId); return String(info.enabled) + '\n'; }, async (path, buf) => { const parts = pathComponent(path, -2).split('_'); const extensionId = parts[parts.length - 1]; await browser.management.setEnabled(extensionId, buf.trim() === "true"); // suppress truncate so it doesn't accidentally flip the state when you do, e.g., `echo true >` }), truncate() { return {}; } }; router["/runtime/reload"] = { async write({path, buf}) { await browser.runtime.reload(); return {size: stringToUtf8Array(buf).length}; }, truncate() { return {}; } }; // Ensure that there are routes for all ancestors. This algorithm is // probably not correct, but whatever. Basically, you need to start at // the deepest level, fill in all the parents 1 level up that don't // exist yet, then walk up one level at a time. It's important to go // one level at a time so you know (for each parent) what all the // children will be. for (let i = 10; i >= 0; i--) { for (let path of Object.keys(router).filter(key => key.split("/").length === i)) { path = path.substr(0, path.lastIndexOf("/")); if (path == '') path = '/'; if (!router[path]) { function depth(p) { return p === '/' ? 0 : (p.match(/\//g) || []).length; } // find all direct children let entries = Object.keys(router) .filter(k => k.startsWith(path) && depth(k) === depth(path) + 1) .map(k => k.substr((path === '/' ? 0 : path.length) + 1).split('/')[0]); entries = [".", "..", ...new Set(entries)]; router[path] = { readdir() { return { entries }; } }; } } // 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. } 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(), { entries: ['.', '..', 'url.txt', 'title.txt', 'text.txt', 'control', 'debugger'] }); assert.deepEqual(await router['/'].readdir(), { entries: ['.', '..', 'windows', 'extensions', 'tabs', 'runtime'] }); assert.deepEqual(await router['/tabs'].readdir(), { entries: ['.', '..', 'create', 'by-id', 'by-title', 'last-focused'] }); assert.deepEqual(findRoute('/tabs/by-id/TABID/url.txt'), router['/tabs/by-id/*/url.txt']); })() } // 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})).buf.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] }; } } 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 }; let didTimeout = false, timeout = setTimeout(() => { // timeout is very useful because some operations just hang // (like trying to take a screenshot, until the tab is focused) didTimeout = true; console.error('timeout'); port.postMessage({ op: req.op, error: unix.ETIMEDOUT }); }, 1000); /* 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);*/ if (!didTimeout) { clearTimeout(timeout); 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(); }