create helpdesk tickets from form submission (#111)

api/services/TurnstileClient.ts

@@ -0,0 +1,25 @@
+const TURNSTILE_SECRET_KEY = process.env.TURNSTILE_SECRET_KEY || '';
+const SITEVERIFY_URL = 'https://challenges.cloudflare.com/turnstile/v0/siteverify';
+
+export class TurnstileClient {
+  async verify(token: string, remoteIp?: string): Promise<boolean> {
+    const body = new URLSearchParams({
+      secret: TURNSTILE_SECRET_KEY,
+      response: token,
+      ...(remoteIp ? { remoteip: remoteIp } : {}),
+    });
+
+    const response = await fetch(SITEVERIFY_URL, {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
+      body: body.toString(),
+    });
+
+    if (!response.ok) {
+      throw new Error(`Turnstile siteverify request failed: ${response.status}`);
+    }
+
+    const json = await response.json() as { success: boolean };
+    return json.success === true;
+  }
+}