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// sandbox-worker.js — WebWorker entry point for isolated agent execution
// Receives: { taskId, task, capabilities, vfsSnapshot, allowedCommands, apiProxy }
// Returns: { taskId, result, error, toolCalls, duration }
let _vfs = null;
let _apiProxyOrigin = null;
// Signal ready immediately
self.postMessage({ type: 'ready' });
self.addEventListener('message', async (e) => {
const { taskId, task, capabilities, vfsSnapshot, allowedCommands, apiProxy } = e.data || {};
// Must have a taskId to respond to
if (!taskId) return;
const startTime = self.performance.now();
let toolCalls = 0;
let result = '';
let error = null;
try {
// Rebuild VFS from snapshot
_vfs = vfsSnapshot ? JSON.parse(vfsSnapshot) : { root: { type: 'dir', content: {} }, currentPath: [] };
_apiProxyOrigin = apiProxy ? new URL(apiProxy).origin : null;
// Parse the task for tool use
const parts = (task || '').trim().split(/\s+/);
const cmd = parts.length > 0 ? parts[0].toLowerCase() : '';
const commandWhitelist = allowedCommands || ['ls', 'cat', 'echo', 'find', 'grep', 'help', 'status'];
if (cmd === 'ls' || cmd === 'list') {
result = sandbox_ls(parts[1] || '/');
toolCalls++;
} else if (cmd === 'cat' || cmd === 'read') {
result = sandbox_cat(parts[1] || '');
toolCalls++;
} else if (cmd === 'find' || cmd === 'search') {
result = sandbox_find(parts.slice(1).join(' ') || '');
toolCalls++;
} else if (cmd === 'grep') {
result = sandbox_grep(parts.slice(1).join(' '));
toolCalls++;
} else if (cmd === 'echo') {
result = parts.slice(1).join(' ');
toolCalls++;
} else if (cmd === 'help') {
result = 'Available commands: ' + commandWhitelist.join(', ');
toolCalls++;
} else if (cmd === 'status') {
result = sandbox_status();
toolCalls++;
} else if (capabilities && capabilities.includes('run_command') && commandWhitelist.includes(cmd)) {
result = sandbox_run(cmd, parts.slice(1));
toolCalls++;
} else {
// If the task is descriptive (not a command), run smart handling
if (capabilities && (capabilities.includes('list_files') || capabilities.includes('read_file'))) {
const lower = (task || '').toLowerCase();
if (lower.includes('list') || lower.includes('file')) {
const dir = parts.find(p => p.startsWith('/') || p.startsWith('.')) || '/';
result = sandbox_ls(dir);
} else if (lower.includes('find') || lower.includes('search')) {
const q = (task || '').replace(/find|search/i, '').trim();
result = sandbox_find(q || '');
} else if (lower.includes('count') || lower.includes('how many')) {
result = sandbox_ls('/');
const count = (result.match(/\[file\]|\[dir\]/g) || []).length;
result = 'Found ' + count + ' items in total.\n' + result;
} else if (lower.includes('status') || lower.includes('health')) {
result = sandbox_status();
} else {
result = 'Task interpreted: "' + (task || '') + '"\nCapabilities: ' + (capabilities || []).join(', ') + '\nTip: Be more specific (e.g. "list files in /")';
}
toolCalls++;
} else {
result = 'Task: "' + (task || '') + '"\nNo matching capability for command "' + cmd + '"';
}
}
} catch (e) {
error = e.message || String(e);
}
const duration = ((self.performance.now() - startTime) / 1000).toFixed(2);
self.postMessage({
taskId: taskId,
result: result,
error: error,
toolCalls: toolCalls,
duration: parseFloat(duration),
vfsSnapshot: JSON.stringify(_vfs)
});
});
// ─── Sandboxed VFS Operations ───
function sandbox_ls(path) {
path = path || '/';
const entries = _vfs_get_entries(path);
if (!entries) return 'ls: ' + path + ': No such directory';
const lines = entries.map(function(e) {
const icon = e.type === 'dir' ? '[dir]' : '[file]';
const size = e.size !== undefined ? ' (' + e.size + 'B)' : '';
return icon + ' ' + e.name + size;
});
return lines.join('\n') || '(empty)';
}
function sandbox_cat(path) {
const content = _vfs_get_content(path);
if (content === null) return 'cat: ' + path + ': No such file';
if (typeof content === 'object') return 'cat: ' + path + ': Is a directory';
if (content.length > 8000) return content.substring(0, 8000) + '\n... (truncated at 8KB)';
return content;
}
function sandbox_find(query) {
const results = [];
const q = query ? query.toLowerCase() : '';
_vfs_walk('/', function(path, node) {
if (node.type === 'file') {
if (!q || path.toLowerCase().includes(q)) {
results.push(path);
}
}
});
if (results.length === 0) return 'No files found' + (query ? ' matching "' + query + '"' : '');
return results.join('\n');
}
function sandbox_grep(query) {
if (!query) return 'grep: missing pattern';
const q = query.toLowerCase();
const results = [];
_vfs_walk('/', function(path, node) {
if (node.type === 'file' && typeof node.content === 'string') {
const lines = node.content.split('\n');
for (let i = 0; i < lines.length; i++) {
if (lines[i].toLowerCase().includes(q)) {
results.push(path + ':' + (i + 1) + ': ' + lines[i].trim().substring(0, 100));
}
}
}
});
if (results.length === 0) return 'grep: no matches for "' + query + '"';
return results.slice(0, 50).join('\n') + (results.length > 50 ? '\n... (+' + (results.length - 50) + ' more)' : '');
}
function sandbox_status() {
let fileCount = 0, dirCount = 0;
_vfs_walk('/', function(path, node) {
if (node.type === 'file') fileCount++;
else dirCount++;
});
const vfsSize = JSON.stringify(_vfs).length;
return 'Sandbox VFS Status:\n Files: ' + fileCount + '\n Directories: ' + dirCount + '\n VFS Size: ' + (vfsSize / 1024).toFixed(1) + 'KB';
}
function sandbox_run(cmd, args) {
return '[sandbox] ' + cmd + ' ' + args.join(' ') + '\n(Command execution limited in sandbox mode)';
}
// ─── VFS Helpers ───
function _vfs_get_entries(path) {
const dir = _vfs_resolve(path);
if (!dir || dir.type !== 'dir') return null;
return Object.entries(dir.content || {}).map(function(entry) {
const name = entry[0];
const node = entry[1];
return {
name: name,
type: node.type || 'file',
size: typeof node.content === 'string' ? node.content.length : undefined
};
}).sort(function(a, b) { return a.name.localeCompare(b.name); });
}
function _vfs_get_content(path) {
const node = _vfs_resolve(path);
if (!node || node.type === 'dir') return null;
return node.content;
}
function _vfs_resolve(path) {
if (!_vfs || !_vfs.root) return null;
if (path === '/' || path === '') return _vfs.root;
const parts = path.split('/').filter(function(p) { return p; });
let current = _vfs.root;
for (let i = 0; i < parts.length; i++) {
if (!current.content || !current.content[parts[i]]) return null;
current = current.content[parts[i]];
}
return current;
}
function _vfs_walk(path, cb) {
const node = _vfs_resolve(path);
if (!node) return;
cb(path, node);
if (node.type === 'dir' && node.content) {
const names = Object.keys(node.content);
for (let i = 0; i < names.length; i++) {
_vfs_walk(path === '/' ? '/' + names[i] : path + '/' + names[i], cb);
}
}
}
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