permissions hook helper
Delayed notification on passthrough, cancelled by PostToolUse if tool proceeds
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chook.mjs
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chook.mjs
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#!/usr/bin/env node
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import { readFileSync, existsSync } from "fs";
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import { readFileSync, existsSync, unlinkSync } from "fs";
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import { appendFileSync, openSync, closeSync, writeFileSync } from "fs";
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import { execFileSync } from "child_process";
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import { spawn } from "child_process";
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import { resolve } from "path";
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import { homedir } from "os";
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···
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}
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}
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// --- Pending notification ---
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const NOTIFY_DELAY_SECS = 3;
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function pendingFile(sessionId) {
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return `/tmp/chook-pending-${sessionId}`;
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}
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function scheduleNotification(sessionId, toolName, detail) {
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const short = detail.length > 80 ? detail.slice(0, 77) + "..." : detail;
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const msg = short.replace(/"/g, '\\"');
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// Spawn a detached shell that sleeps then notifies
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const child = spawn(
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"sh",
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[
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"-c",
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`sleep ${NOTIFY_DELAY_SECS} && osascript -e 'display notification "${msg}" with title "chook: ${toolName} needs approval" sound name "Ping"'`,
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],
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{ detached: true, stdio: "ignore" },
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);
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child.unref();
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// Write PID so PostToolUse can cancel it
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try {
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writeFileSync(pendingFile(sessionId), String(child.pid));
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} catch {}
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}
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function cancelNotification(sessionId) {
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const f = pendingFile(sessionId);
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try {
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const pid = parseInt(readFileSync(f, "utf-8").trim());
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// Kill the process group (negative PID) to get the sleep + osascript
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try { process.kill(-pid); } catch {}
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try { process.kill(pid); } catch {}
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unlinkSync(f);
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} catch {}
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}
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// --- Hook output ---
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function makeOutput(decision, reason) {
···
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}
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audit(config.audit, input, "passthrough", null);
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// Schedule a delayed notification — PostToolUse will cancel it if tool proceeds quickly
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const detail = toolInput.command || toolInput.file_path || toolInput.notebook_path || toolName;
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scheduleNotification(input.session_id, toolName, detail);
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} catch (e) {
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process.stderr.write(`chook error: ${e.message}\n`);
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process.exit(1);
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}
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} else if (command === "post") {
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// PostToolUse handler — cancel any pending notification
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try {
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const stdin = readFileSync(0, "utf-8");
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const input = JSON.parse(stdin);
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cancelNotification(input.session_id);
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} catch {}
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} else if (command === "allow-last" || command === "deny-last") {
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const configPath = getConfigPath();
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const ruleType = command === "allow-last" ? "allow" : "deny";