1 files changed, 56 insertions, 0 deletions
diff --git a/src/misc/captcha.ts b/src/misc/captcha.ts
new file mode 100644
index 0000000000..87ec143ca8
--- /dev/null
+++ b/src/misc/captcha.ts
@@ -0,0 +1,56 @@
+import fetch from 'node-fetch';
+import { URLSearchParams } from 'url';
+import { getAgentByUrl } from './fetch';
+import config from '../config';
+
+export async function verifyRecaptcha(secret: string, response: string) {
+	const result = await getCaptchaResponse('https://www.recaptcha.net/recaptcha/api/siteverify', secret, response).catch(e => {
+		throw `recaptcha-request-failed: ${e}`;
+	});
+
+	if (result.success !== true) {
+		const errorCodes = result['error-codes'] ? result['error-codes']?.join(', ') : '';
+		throw `recaptcha-failed: ${errorCodes}`;
+	}
+}
+
+export async function verifyHcaptcha(secret: string, response: string) {
+	const result = await getCaptchaResponse('https://hcaptcha.com/siteverify', secret, response).catch(e => {
+		throw `hcaptcha-request-failed: ${e}`;
+	});
+
+	if (result.success !== true) {
+		const errorCodes = result['error-codes'] ? result['error-codes']?.join(', ') : '';
+		throw `hcaptcha-failed: ${errorCodes}`;
+	}
+}
+
+type CaptchaResponse = {
+	success: boolean;
+	'error-codes'?: string[];
+};
+
+async function getCaptchaResponse(url: string, secret: string, response: string): Promise<CaptchaResponse> {
+	const params = new URLSearchParams({
+		secret,
+		response
+	});
+
+	const res = await fetch(url, {
+		method: 'POST',
+		body: params,
+		headers: {
+			'User-Agent': config.userAgent
+		},
+		timeout: 10 * 1000,
+		agent: getAgentByUrl
+	}).catch(e => {
+		throw `${e.message || e}`;
+	});
+
+	if (!res.ok) {
+		throw `${res.status}`;
+	}
+
+	return await res.json() as CaptchaResponse;
+}