core: use common plugin-api interface

packages/recaptcha/index.ts

@@ -0,0 +1,27 @@
+import {
+    Context, ForbiddenError, PRIV, superagent, SystemModel, ValidationError,
+} from 'hydrooj';
+
+export function apply(ctx: Context) {
+    ctx.on('handler/before/UserRegister', async (thisArg) => {
+        if (!SystemModel.get('recaptcha.key')) return;
+        if (thisArg.request.method !== 'post') {
+            thisArg.UiContext.recaptchaKey = SystemModel.get('recaptcha.key');
+            return;
+        }
+        if (thisArg.user.hasPriv(PRIV.PRIV_UNLIMITED_ACCESS)) return;
+        if (!thisArg.args.captcha) throw new ValidationError('captcha');
+        const response = await superagent.post('https://recaptcha.net/recaptcha/api/siteverify')
+            .field('secret', SystemModel.get('recaptcha.secret'))
+            .field('response', thisArg.args.captcha)
+            .field('remoteip', thisArg.request.ip);
+        if (!response.body.success) throw new ForbiddenError('captcha fail');
+    });
+
+    ctx.on('handler/after/UserRegister', async (thisArg) => {
+        thisArg.response.body.captcha = `\
+<script src="https://recaptcha.net/recaptcha/api.js?render=${SystemModel.get('recaptcha.key')}"></script>
+<input type="text" name="captcha" id="_captcha" style="display:none">
+<input type="submit" id="_submit" style="display:none">`;
+    });
+}