mirror of
https://github.com/osnr/TabFS.git
synced 2024-05-16 20:46:37 +02:00
426 lines
13 KiB
JavaScript
426 lines
13 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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// tabs/by-id/ID/title
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// tabs/by-id/ID/url
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// tabs/by-id/ID/console
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// tabs/by-id/ID/mem (?)
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// tabs/by-id/ID/cpu (?)
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// tabs/by-id/ID/screenshot.png
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// tabs/by-id/ID/text.txt
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// tabs/by-id/ID/printed.pdf
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// tabs/by-id/ID/control
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// tabs/by-id/ID/sources/
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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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function utf8(str, offset, size) {
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// converts to UTF8, then takes slice
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var utf8 = [];
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for (var i=0; i < str.length; i++) {
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var charcode = str.charCodeAt(i);
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if (charcode < 0x80) utf8.push(charcode);
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else if (charcode < 0x800) {
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utf8.push(0xc0 | (charcode >> 6),
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0x80 | (charcode & 0x3f));
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}
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else if (charcode < 0xd800 || charcode >= 0xe000) {
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utf8.push(0xe0 | (charcode >> 12),
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0x80 | ((charcode>>6) & 0x3f),
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0x80 | (charcode & 0x3f));
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}
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// surrogate pair
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else {
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i++;
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charcode = ((charcode&0x3ff)<<10)|(str.charCodeAt(i)&0x3ff)
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utf8.push(0xf0 | (charcode >>18),
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0x80 | ((charcode>>12) & 0x3f),
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0x80 | ((charcode>>6) & 0x3f),
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0x80 | (charcode & 0x3f));
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}
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}
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return String.fromCharCode(...utf8.slice(offset, offset + size))
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}
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function stringSize(str) {
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// returns the byte length of an utf8 string
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var s = str.length;
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for (var i=str.length-1; i>=0; i--) {
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var code = str.charCodeAt(i);
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if (code > 0x7f && code <= 0x7ff) s++;
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else if (code > 0x7ff && code <= 0xffff) s+=2;
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if (code >= 0xDC00 && code <= 0xDFFF) i--; //trail surrogate
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}
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return s + 1;
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}
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const debugging = {};
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async function debugTab(tabId) {
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if (debugging[tabId]) {
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debugging[tabId] += 1;
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} else {
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await new Promise((resolve, reject) => chrome.debugger.attach({tabId}, "1.3", () => {
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if (chrome.runtime.lastError) {
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reject(chrome.runtime.lastError);
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} else {
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debugging[tabId] = 1;
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resolve();
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}
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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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console.log(method, result);
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if (result) {
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resolve(result);
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} else {
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reject(chrome.runtime.lastError);
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}
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})
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);
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}
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let lastFocusedWindowId;
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browser.windows.getLastFocused().then(window => { lastFocusedWindowId = window.id; });
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browser.windows.onFocusChanged.addListener(windowId => {
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if (windowId !== -1) lastFocusedWindowId = windowId;
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});
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/* if I could specify a custom editor interface for all the routing
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below ... I would highlight the route names in blocks of some color
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that sticks out, and let you collapse them. then you could get a
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view of what the whole filesystem looks like at a glance. */
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const router = {};
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function withTab(handler) {
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return {
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async getattr({path}) {
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const tab = await browser.tabs.get(parseInt(pathComponent(path, -2)));
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return {
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st_mode: unix.S_IFREG | 0444,
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st_nlink: 1,
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st_size: stringSize(handler(tab))
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};
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},
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async open({path}) { return { fh: 0 }; },
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async read({path, fh, size, offset}) {
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const tab = await browser.tabs.get(parseInt(pathComponent(path, -2)));
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return { buf: utf8(handler(tab), offset, size) };
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}
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};
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}
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function fromScript(code) {
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return {
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async getattr({path}) {
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const tabId = parseInt(pathComponent(path, -2));
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return {
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st_mode: unix.S_IFREG | 0444,
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st_nlink: 1,
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st_size: stringSize((await browser.tabs.executeScript(tabId, {code}))[0])
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};
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},
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async open({path}) { return { fh: 0 }; },
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async read({path, fh, size, offset}) {
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const tabId = parseInt(pathComponent(path, -2));
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return { buf: utf8((await browser.tabs.executeScript(tabId, {code}))[0], offset, size) }
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}
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};
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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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router["/tabs/by-id/*/url"] = withTab(tab => tab.url + "\n");
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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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router["/tabs/by-id/*/screenshot.png"] = {
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async read({path, fh, size, offset}) {
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const tabId = parseInt(pathComponent(path, -2));
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await debugTab(tabId);
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await sendDebuggerCommand(tabId, "Page.enable", {});
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const {data} = await sendDebuggerCommand(tabId, "Page.captureScreenshot");
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return { buf: utf8(atob(data), offset, size) };
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}
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};
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router["/tabs/by-id/*/resources"] = {
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async opendir({path}) {
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const tabId = parseInt(pathComponent(path, -2));
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await debugTab(tabId);
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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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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/*"] = {
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async getattr({path}) {
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// FIXME: cache the file
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const tabId = parseInt(pathComponent(path, -3));
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const suffix = pathComponent(path, -1);
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if (!debugging[tabId]) throw new UnixError(unix.EIO);
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await sendDebuggerCommand(tabId, "Page.enable", {});
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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) {
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content = atob(content);
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}
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return {
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st_mode: unix.S_IFREG | 0444,
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st_nlink: 1,
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st_size: stringSize(content) // FIXME
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};
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}
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}
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},
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async open({path}) {
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// FIXME: cache the file
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return {fh: 3};
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},
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async read({path, fh, size, offset}) {
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const tabId = parseInt(pathComponent(path, -3));
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const suffix = pathComponent(path, -1);
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if (!debugging[tabId]) throw new UnixError(unix.EIO);
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await sendDebuggerCommand(tabId, "Page.enable", {});
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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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return { buf: utf8(base64Encoded ? atob(content) : content, offset, size) };
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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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async release({path, fh}) {
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return {};
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}
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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 new Promise(resolve => chrome.tabs[command](tabId, resolve));
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}
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};
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router["/tabs/by-title"] = {
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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("_");
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const id = parts[parts.length - 1];
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return { buf: "../by-id/" + id };
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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: lastFocusedWindowId }))[0].id;
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return { buf: "by-id/" + 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(), ['url', 'title', 'text', 'control']);
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assert.deepEqual(await router['/'].readdir(), ['tabs']);
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assert.deepEqual(await router['/tabs'].readdir(), ['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})).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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