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const ws = new WebSocket("ws://localhost:8888");
const ops = {
NONE: 0,
GETATTR: 1,
OPEN: 2,
READDIR: 3,
READ: 4
};
const unix = {
EPERM: 1,
ENOENT: 2,
ESRCH: 3,
EINTR: 4,
EIO: 5,
ENXIO: 6,
// Unix file types
S_IFMT: 0170000, // type of file mask
S_IFIFO: 010000, // named pipe (fifo)
S_IFCHR: 020000, // character special
S_IFDIR: 040000, // directory
S_IFBLK: 060000, // block special
S_IFREG: 0100000, // regular
S_IFLNK: 0120000, // symbolic link
S_IFSOCK: 0140000, // socket
}
function UnixError(error) {
this.name = "UnixError";
this.error = error;
}
UnixError.prototype = Error.prototype;
function queryTabs() {
return new Promise((resolve, reject) => chrome.tabs.query({}, resolve));
}
const router = {
"tabs": {
"by-id": {
async readdir() {
const tabs = await queryTabs();
return tabs.map(tab => String(tab.id));
},
"*": {
async getattr() {
return {
st_mode: unix.S_IFREG | 0444,
st_nlink: 1,
st_size: 10 // FIXME
};
}
}
}
}
};
function findRoute(path) {
let route = router;
for (let segment of path.split("/")) {
if (segment === "") continue;
route = route[segment] || route["*"];
if (!route) throw new UnixError(unix.ENOENT);
}
return route;
}
async function getattr(path) {
let route = findRoute(path);
if (route.getattr) {
return route.getattr();
} else {
return {
st_mode: unix.S_IFDIR | 0755,
st_nlink: 3
};
}
}
async function readdir(path) {
let route = findRoute(path);
if (route.readdir) {
return route.readdir();
}
return Object.keys(route);
}
ws.onmessage = async function(event) {
const req = JSON.parse(event.data);
console.log('req', Object.entries(ops).find(([op, opcode]) => opcode === req.op)[0], req);
let response = { op: req.op, error: unix.EIO };
try {
if (req.op === ops.GETATTR) {
response = {
op: ops.GETATTR,
st_mode: 0,
st_nlink: 0,
st_size: 0,
...(await getattr(req.path))
};
} else if (req.op === ops.OPEN) {
throw new UnixError(unix.EIO);
} else if (req.op === ops.READDIR) {
response = {
op: ops.READDIR,
entries: [".", "..", ...(await readdir(req.path))]
};
} else if (req.op === ops.READ) {
response = {
op: ops.READ,
buf: await read(req.path)
};
}
} catch (e) {
response = {
op: req.op,
error: e instanceof UnixError ? e.error : unix.EIO
}
}
console.log('response', Object.entries(ops).find(([op, opcode]) => opcode === response.op)[0], response);
ws.send(JSON.stringify(response));
};
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