mirror of
https://github.com/osnr/TabFS.git
synced 2024-05-16 20:46:37 +02:00
474 lines
15 KiB
JavaScript
474 lines
15 KiB
JavaScript
const TESTING = (typeof chrome === 'undefined');
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const unix = {
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EPERM: 1,
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ENOENT: 2,
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ESRCH: 3,
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EINTR: 4,
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EIO: 5,
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ENXIO: 6,
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ENOTSUP: 45,
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// Unix file types
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S_IFMT: 0170000, // type of file mask
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S_IFIFO: 010000, // named pipe (fifo)
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S_IFCHR: 020000, // character special
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S_IFDIR: 040000, // directory
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S_IFBLK: 060000, // block special
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S_IFREG: 0100000, // regular
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S_IFLNK: 0120000, // symbolic link
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S_IFSOCK: 0140000, // socket
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}
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class UnixError extends Error {
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constructor(error) { super(); this.name = "UnixError"; this.error = error; }
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}
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function pathComponent(path, i) {
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const components = path.split('/');
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return components[i >= 0 ? i : components.length + i];
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}
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function sanitize(s) { return s.replace(/[^A-Za-z0-9_\-\.]/gm, '_'); }
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const stringToUtf8Array = (function() {
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const encoder = new TextEncoder("utf-8");
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return str => encoder.encode(str);
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})();
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const utf8ArrayToString = (function() {
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const decoder = new TextDecoder("utf-8");
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return utf8 => decoder.decode(utf8);
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})();
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const TabManager = {
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tabState: {},
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debugTab: async function(tabId) {
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this.tabState[tabId] = this.tabState[tabId] || {};
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if (this.tabState[tabId].debugging) {
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this.tabState[tabId].debugging += 1;
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} else {
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await new Promise((resolve, reject) => chrome.debugger.attach({tabId}, "1.3", async () => {
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if (chrome.runtime.lastError) {
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if (chrome.runtime.lastError.message.indexOf('Another debugger is already attached') !== -1) {
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chrome.debugger.detach({tabId}, async () => {
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await TabManager.debugTab(tabId);
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resolve();
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});
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} else {
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reject(chrome.runtime.lastError); return;
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}
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return;
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}
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this.tabState[tabId].debugging = 1; resolve();
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}));
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}
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},
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enableDomainForTab: async function(tabId, domain) {
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this.tabState[tabId] = this.tabState[tabId] || {};
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if (this.tabState[tabId][domain]) { this.tabState[tabId][domain] += 1;
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} else {
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await sendDebuggerCommand(tabId, `${domain}.enable`, {});
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this.tabState[tabId][domain] = 1;
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}
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}
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};
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function sendDebuggerCommand(tabId, method, commandParams) {
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return new Promise((resolve, reject) =>
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chrome.debugger.sendCommand({tabId}, method, commandParams, result => {
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if (result) { resolve(result); } else { reject(chrome.runtime.lastError); }
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})
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);
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}
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const BrowserState = { lastFocusedWindowId: null, scriptsForTab: {} };
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(function() {
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if (TESTING) return;
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browser.windows.getLastFocused().then(window => { BrowserState.lastFocusedWindowId = window.id; });
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browser.windows.onFocusChanged.addListener(windowId => {
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if (windowId !== -1) BrowserState.lastFocusedWindowId = windowId;
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});
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chrome.debugger.onEvent.addListener((source, method, params) => {
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console.log(source, method, params);
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if (method === "Page.") {
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// we're gonna assume we're always plugged into both Page and Debugger.
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BrowserState.scriptsForTab[source.tabId] = [];
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} else if (method === "Debugger.scriptParsed") {
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BrowserState.scriptsForTab[source.tabId] = BrowserState.scriptsForTab[source.tabId] || [];
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BrowserState.scriptsForTab[source.tabId].push(params);
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// FIXME: clear these out when page changes in tab (how?)
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}
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});
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})();
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const router = {};
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const Cache = {
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// used when you open a file to cache the content we got from the browser
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// until you close that file.
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store: {}, nextHandle: 0,
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storeObject(object) {
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const handle = ++this.nextHandle;
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this.store[handle] = object;
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return handle;
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},
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getObjectForHandle(handle) { return this.store[handle]; },
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removeObjectForHandle(handle) { delete this.store[handle]; }
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};
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function toUtf8Array(stringOrArray) {
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if (typeof stringOrArray == 'string') { return stringToUtf8Array(stringOrArray); }
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else { return stringOrArray; }
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}
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const defineFile = (getData, setData) => ({
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async getattr({path}) {
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return {
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st_mode: unix.S_IFREG | 0444 | (setData ? 0222 : 0),
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st_nlink: 1,
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st_size: toUtf8Array(await getData(path)).length
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};
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},
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async open({path}) { return { fh: Cache.storeObject(toUtf8Array(await getData(path))) }; },
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async read({path, fh, size, offset}) {
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return { buf: String.fromCharCode(...Cache.getObjectForHandle(fh).slice(offset, offset + size)) }
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},
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async write({path, fh, offset, buf}) {
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// FIXME: patch
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// I guess caller should override write() if they want to actually
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// patch and not just re-set the whole string (for example,
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// if they want to hot-reload just one function the user modified)
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const arr = Cache.getObjectForHandle(fh);
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const bufarr = stringToUtf8Array(buf);
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arr.splice(offset, bufarr.length, ...bufarr);
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await setData(path, utf8ArrayToString(arr)); return { size: bufarr.length };
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},
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async release({fh}) { Cache.removeObjectForHandle(fh); return {}; },
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async truncate({path, size}) {
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// TODO: weird case if they truncate while the file is open
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// (but `echo hi > foo.txt`, the main thing I care about, uses
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// O_TRUNC which thankfully doesn't do that)
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const arr = toUtf8Array(await getData(path));
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arr.splice(size);
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await setData(path, arr); return {};
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}
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});
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router["/tabs/create"] = {
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async write({path, buf}) {
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const url = buf.trim();
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await browser.tabs.create({url});
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return {size: stringToUtf8Array(buf).length};
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},
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async truncate({path, size}) { return {}; }
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}
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router["/tabs/by-id"] = {
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async readdir() {
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const tabs = await browser.tabs.query({});
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return { entries: [".", "..", ...tabs.map(tab => String(tab.id))] };
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}
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};
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// (should these have .txt extensions?)
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// title
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// url
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// text
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// TODO: document.html
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// TODO: console
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// TODO: mem (?)
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// TODO: cpu (?)
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// TODO: dom/ ?
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// TODO: globals/ ?
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// screenshot.png (FIXME: how to keep from blocking when unfocused?)
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// TODO: archive.mhtml ?
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// TODO: printed.pdf
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// control
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// resources/
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// TODO: scripts/ TODO: allow creation, eval immediately
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(function() {
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const withTab = (readHandler, writeHandler) => defineFile(async path => {
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const tabId = parseInt(pathComponent(path, -2));
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const tab = await browser.tabs.get(tabId);
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return readHandler(tab);
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}, writeHandler ? async (path, buf) => {
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const tabId = parseInt(pathComponent(path, -2));
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await browser.tabs.update(tabId, writeHandler(buf));
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} : undefined);
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const fromScript = code => defineFile(async path => {
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const tabId = parseInt(pathComponent(path, -2));
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return (await browser.tabs.executeScript(tabId, {code}))[0];
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});
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router["/tabs/by-id/*/url"] = withTab(tab => tab.url + "\n", buf => ({ url: buf }));
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router["/tabs/by-id/*/title"] = withTab(tab => tab.title + "\n");
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router["/tabs/by-id/*/text"] = fromScript(`document.body.innerText`);
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})();
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router["/tabs/by-id/*/screenshot.png"] = defineFile(async path => {
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const tabId = parseInt(pathComponent(path, -2));
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await TabManager.debugTab(tabId); await TabManager.enableDomainForTab(tabId, "Page");
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const {data} = await sendDebuggerCommand(tabId, "Page.captureScreenshot");
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return Uint8Array.from(atob(data), c => c.charCodeAt(0));
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});
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router["/tabs/by-id/*/resources"] = {
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async readdir({path}) {
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const tabId = parseInt(pathComponent(path, -2));
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await TabManager.debugTab(tabId); await TabManager.enableDomainForTab(tabId, "Page");
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const {frameTree} = await sendDebuggerCommand(tabId, "Page.getResourceTree", {});
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return { entries: [".", "..", ...frameTree.resources.map(r => sanitize(String(r.url).slice(0, 200)))] };
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}
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};
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router["/tabs/by-id/*/resources/*"] = defineFile(async path => {
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const [tabId, suffix] = [parseInt(pathComponent(path, -3)), pathComponent(path, -1)];
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await TabManager.debugTab(tabId); await TabManager.enableDomainForTab(tabId, "Page");
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const {frameTree} = await sendDebuggerCommand(tabId, "Page.getResourceTree", {});
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for (let resource of frameTree.resources) {
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const resourceSuffix = sanitize(String(resource.url).slice(0, 200));
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if (resourceSuffix === suffix) {
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let {base64Encoded, content} = await sendDebuggerCommand(tabId, "Page.getResourceContent", {
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frameId: frameTree.frame.id,
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url: resource.url
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});
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if (base64Encoded) { return Uint8Array.from(atob(content), c => c.charCodeAt(0)); }
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return content;
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}
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}
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throw new UnixError(unix.ENOENT);
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});
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router["/tabs/by-id/*/scripts"] = {
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async opendir({path}) {
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const tabId = parseInt(pathComponent(path, -2));
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await TabManager.debugTab(tabId); await TabManager.enableDomainForTab(tabId, "Debugger");
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return { fh: 0 };
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},
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async readdir({path}) {
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const tabId = parseInt(pathComponent(path, -2));
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return { entries: [".", "..", ...BrowserState.scriptsForTab[tabId].map(params => sanitize(params.url).slice(0, 200) + "_" + params.scriptId)] };
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}
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};
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router["/tabs/by-id/*/scripts/*"] = defineFile(async path => {
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const [tabId, suffix] = [parseInt(pathComponent(path, -3)), pathComponent(path, -1)];
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await TabManager.debugTab(tabId);
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await TabManager.enableDomainForTab(tabId, "Page");
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await TabManager.enableDomainForTab(tabId, "Debugger");
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const parts = path.split("_"); const scriptId = parts[parts.length - 1];
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const {scriptSource} = await sendDebuggerCommand(tabId, "Debugger.getScriptSource", {scriptId});
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return scriptSource;
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}, async (path, buf) => {
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const [tabId, suffix] = [parseInt(pathComponent(path, -3)), pathComponent(path, -1)];
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await TabManager.debugTab(tabId); await TabManager.enableDomainForTab(tabId, "Debugger");
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const parts = path.split("_"); const scriptId = parts[parts.length - 1];
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await sendDebuggerCommand(tabId, "Debugger.setScriptSource", {scriptId, scriptSource: buf});
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return {};
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});
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router["/tabs/by-id/*/control"] = {
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// echo remove >> mnt/tabs/by-id/1644/control
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async write({path, buf}) {
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const tabId = parseInt(pathComponent(path, -2));
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const command = buf.trim();
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// can use `discard`, `remove`, `reload`, `goForward`, `goBack`...
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// see https://developer.chrome.com/extensions/tabs
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await browser.tabs[command](tabId);
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return {size: stringToUtf8Array(buf).length};
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},
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async truncate({path, size}) { return {}; }
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};
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router["/tabs/by-title"] = {
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getattr() {
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return {
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st_mode: unix.S_IFDIR | 0777,
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st_nlink: 3,
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st_size: 0,
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};
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},
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async readdir() {
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const tabs = await browser.tabs.query({});
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return { entries: [".", "..", ...tabs.map(tab => sanitize(String(tab.title).slice(0, 200)) + "_" + String(tab.id))] };
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}
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};
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router["/tabs/by-title/*"] = {
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// a symbolic link to /tabs/by-id/[id for this tab]
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async readlink({path}) {
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const parts = path.split("_"); const tabId = parts[parts.length - 1];
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return { buf: "../by-id/" + tabId };
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},
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async unlink({path}) {
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const parts = path.split("_"); const tabId = parseInt(parts[parts.length - 1]);
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await browser.tabs.remove(tabId);
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return {};
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}
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};
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router["/tabs/last-focused"] = {
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// a symbolic link to /tabs/by-id/[id for this tab]
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async readlink({path}) {
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const id = (await browser.tabs.query({ active: true, windowId: BrowserState.lastFocusedWindowId }))[0].id;
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return { buf: "by-id/" + id };
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}
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}
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router["/extensions"] = {
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async readdir() {
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const infos = await browser.management.getAll();
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return { entries: [".", "..", ...infos.map(info => `${sanitize(info.name)}_${info.id}`)] };
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}
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};
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// Ensure that there are routes for all ancestors. This algorithm is
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// probably not correct, but whatever. I also think it would be
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// better to compute this stuff on the fly, so you could patch more
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// routes in at runtime, but I need to think a bit about how to make
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// that work with wildcards.
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for (let key in router) {
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let path = key;
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while (path !== "/") { // walk upward through the path
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path = path.substr(0, path.lastIndexOf("/"));
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if (path == '') path = '/';
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if (!router[path]) {
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// find all direct children
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let children = Object.keys(router)
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.filter(k => k.startsWith(path) &&
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(k.match(/\//g) || []).length ===
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(path.match(/\//g) || []).length + 1)
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.map(k => k.substr((path === '/' ? 0 : path.length) + 1).split('/')[0]);
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children = [".", "..", ...new Set(children)];
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router[path] = { readdir() { return { entries: children }; } };
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}
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}
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}
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if (TESTING) { // I wish I could color this section with... a pink background, or something.
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const assert = require('assert');
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(async () => {
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assert.deepEqual(await router['/tabs/by-id/*'].readdir(), { entries: ['.', '..', 'url', 'title', 'text', 'screenshot.png', 'resources', 'scripts', 'control'] });
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assert.deepEqual(await router['/'].readdir(), { entries: ['.', '..', 'tabs', 'extensions'] });
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assert.deepEqual(await router['/tabs'].readdir(), { entries: ['.', '..', 'by-id', 'by-title'] });
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assert.deepEqual(findRoute('/tabs/by-id/TABID/url'), router['/tabs/by-id/*/url']);
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})()
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}
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// fill in default implementations of fs ops
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for (let key in router) {
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// if readdir -> directory -> add getattr, opendir, releasedir
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if (router[key].readdir) {
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router[key] = {
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getattr() {
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return {
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st_mode: unix.S_IFDIR | 0755,
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st_nlink: 3,
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st_size: 0,
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};
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},
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opendir({path}) { return { fh: 0 }; },
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releasedir({path}) { return {}; },
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...router[key]
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};
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} else if (router[key].readlink) {
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router[key] = {
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async getattr({path}) {
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const st_size = (await this.readlink({path})).buf.length + 1;
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return {
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st_mode: unix.S_IFLNK | 0444,
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st_nlink: 1,
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// You _must_ return correct linkee path length from getattr!
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st_size
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};
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},
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...router[key]
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};
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} else if (router[key].read || router[key].write) {
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router[key] = {
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async getattr() {
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return {
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st_mode: unix.S_IFREG | ((router[key].read && 0444) || (router[key].write && 0222)),
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st_nlink: 1,
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st_size: 100 // FIXME
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};
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},
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open() {
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return { fh: 0 };
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},
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release() {
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return {};
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},
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...router[key]
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};
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}
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}
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console.log(router);
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function findRoute(path) {
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let pathSegments = path.split("/");
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if (pathSegments[pathSegments.length - 1].startsWith("._")) {
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throw new UnixError(unix.ENOTSUP); // Apple Double file for xattrs
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}
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let routingPath = "";
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for (let segment of pathSegments) {
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if (routingPath === "/") { routingPath = ""; }
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if (router[routingPath + "/*"]) {
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routingPath += "/*";
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} else if (router[routingPath + "/" + segment]) {
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routingPath += "/" + segment;
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} else {
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throw new UnixError(unix.ENOENT);
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}
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}
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return router[routingPath];
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}
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let port;
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async function onMessage(req) {
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if (req.buf) req.buf = atob(req.buf);
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console.log('req', req);
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let response = { op: req.op, error: unix.EIO };
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/* console.time(req.op + ':' + req.path);*/
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try {
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response = await findRoute(req.path)[req.op](req);
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response.op = req.op;
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if (response.buf) { response.buf = btoa(response.buf); }
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} catch (e) {
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console.error(e);
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response = {
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op: req.op,
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error: e instanceof UnixError ? e.error : unix.EIO
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}
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}
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/* console.timeEnd(req.op + ':' + req.path);*/
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console.log('resp', response);
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port.postMessage(response);
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};
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function tryConnect() {
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port = chrome.runtime.connectNative('com.rsnous.tabfs');
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port.onMessage.addListener(onMessage);
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port.onDisconnect.addListener(p => {console.log('disconnect', p)});
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}
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if (!TESTING) {
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tryConnect();
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}
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