mirror of
https://github.com/osnr/TabFS.git
synced 2024-05-17 13:06:35 +02:00
462 lines
13 KiB
JavaScript
462 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) {
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super();
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this.name = "UnixError";
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this.error = error;
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}
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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) {
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return s.replace(/[^A-Za-z0-9_\-\.]/gm, '_');
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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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const directoryGetattr = async function() {
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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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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: handler(tab).substr(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: (await browser.tabs.executeScript(tabId, {code}))[0]
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.substr(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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getattr: directoryGetattr,
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async opendir({path}) { return { fh: 0 }; },
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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/*/resources"] = {
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getattr: directoryGetattr,
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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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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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if (base64Encoded) {
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const buf = btoa(atob(content).substr(offset, size));
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return { buf, base64Encoded: true };
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}
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return content.substr(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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async getattr() { // generic read-only file attr
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return {
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st_mode: unix.S_IFREG | 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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// 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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getattr: directoryGetattr,
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async opendir({path}) { return { fh: 0 }; },
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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 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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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 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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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] = {
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getattr: directoryGetattr,
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opendir({path}) { return { fh: 0 }; },
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readdir() { return { entries: children }; }
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};
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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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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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/* const ops = {
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* async getattr({path}) {
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* let route = findRoute(path);
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* if (route.getattr) {
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* return {
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* st_mode: 0,
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* st_nlink: 0,
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* st_size: 0,
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* ...(await route.getattr(path))
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* };
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* } else if (route.read || route.write) {
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* // default file attrs
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* return {
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* st_mode: unix.S_IFREG | ((route.read && 0444) || (route.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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* } else {
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* // default dir attrs
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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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* },
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*
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* async open({path}) {
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* let route = findRoute(path);
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* if (route.open) return { fh: await route.open(path) };
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* else return { fh: 0 }; // empty fh
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* },
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*
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* async read({path, fh, size, offset}) {
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* let route = findRoute(path);
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* if (route.read) {
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* const ret = await route.read(path, fh, size, offset);
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* if (typeof ret === 'string') {
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* return { buf: ret };
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* } else {
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* return ret;
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* }
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* }
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* },
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* async write({path, buf, offset}) {
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* let route = findRoute(path);
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* if (route.write) return route.write(path, atob(buf), offset);
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* },
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* async release({path, fh}) {
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* let route = findRoute(path);
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* if (route.release) return route.release(path, fh);
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* },
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*
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* async readlink({path}) {
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* let route = findRoute(path);
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* if (route.readlink) return { buf: await route.readlink(path) };
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* },
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*
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* async opendir({path}) {
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* let route = findRoute(path);
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* if (route.opendir) return { fh: await route.opendir(path) };
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* else return { fh: 0 }; // empty fh
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* },
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* async readdir({path}) {
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* let route = findRoute(path);
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* if (route.entries) return { entries: await route.entries(path) };
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* },
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* async releasedir({path}) {
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* let route = findRoute(path);
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* if (route.releasedir) return route.releasedir(path);
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* else return {};
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* }
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* };*/
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let port;
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async function onMessage(req) {
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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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} 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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