Initial commit — eLegal Software monorepo

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

apps/api/src/routes/tool-usage.ts

@@ -0,0 +1,53 @@
+import type { FastifyInstance } from 'fastify';
+import { z } from 'zod';
+import { and, eq, gte, sql } from 'drizzle-orm';
+import { getDb, toolUsage } from '@lawdesk/db';
+
+const TOOL_NAMES = [
+  'hourly-rate-calculator',
+  'case-profitability',
+  'billable-hours-tracker',
+  'document-templates',
+] as const;
+
+const logBody = z.object({
+  tool: z.enum(TOOL_NAMES),
+  sessionId: z.string().max(64).optional(),
+});
+
+export async function toolUsageRoutes(app: FastifyInstance) {
+  // Log a usage event. Rate-limited per IP so a malicious caller can't pump up "online now" counts.
+  app.post(
+    '/api/tool-usage',
+    { config: { rateLimit: { max: 60, timeWindow: '1 minute' } } },
+    async (req, reply) => {
+      const parsed = logBody.safeParse(req.body);
+      if (!parsed.success) return reply.code(400).send({ error: 'invalid_tool' });
+      await getDb().insert(toolUsage).values({
+        tool: parsed.data.tool,
+        sessionId: parsed.data.sessionId ?? null,
+        ip: req.ip ?? null,
+      });
+      return { ok: true };
+    },
+  );
+
+  // Per-tool count of unique sessions in the last 5 minutes — what the public pages display
+  // as "X online". Public route, very cheap query.
+  app.get('/api/tool-usage/online', async () => {
+    const since = new Date(Date.now() - 5 * 60 * 1000);
+    const rows = await getDb()
+      .select({
+        tool: toolUsage.tool,
+        // Distinct (session_id, ip) so multiple page hits from the same browser don't multi-count
+        count: sql<number>`count(distinct coalesce(${toolUsage.sessionId}, host(${toolUsage.ip}::inet)))::int`,
+      })
+      .from(toolUsage)
+      .where(gte(toolUsage.createdAt, since))
+      .groupBy(toolUsage.tool);
+
+    const map: Record<string, number> = {};
+    for (const r of rows) map[r.tool] = r.count;
+    return { online: map, since: since.toISOString() };
+  });
+}