[add] Signature Disclaimer alert

Author: github-actions[bot]

pages/signature.tsx

@@ -45,18 +45,30 @@ export default class SignaturePage extends ObservedComponent<RouteProps, typeof
     const { t } = this.observedContext,
       { value, iframeLink } = this.props.route.query;
 
-    const title = value ? textJoin(t('sign'), value + '') : t('generate_key_pair');
+    const title = value ? textJoin(t('sign'), value + '') : t('generate_key_pair'),
+      link = `${iframeLink}?${this.linkData}`;
 
     return (
       <Container>
         <PageHead title={title} />
 
         <h1 className="my-5 text-truncate">{title}</h1>
 
+        <section className="markdown-body bg-white py-4">
+          <blockquote>{t('signature_disclaimer')}</blockquote>
+          <pre>
+            <code>
+              <a href={link} target="_blank" rel="noopener noreferrer">
+                {link}
+              </a>
+            </code>
+          </pre>
+        </section>
+
         <iframe
           className="border-0 w-100 vh-100"
           sandbox="allow-scripts allow-same-origin allow-forms"
-          src={`${iframeLink}?${this.linkData}`}
+          src={link}
         />
       </Container>
     );

translation/en-US.ts

@@ -108,6 +108,8 @@ export default {
   // Signature page
   sign: 'Sign',
   generate_key_pair: 'Generate Key Pair',
+  signature_disclaimer:
+    'This page is a public service that provides Key Pair & Signature generation based on Web crypto API. Due to the sandbox environment of web browsers, the generated Private Key is only securely stored locally on the user, while the Public Key and Signature will be sent to the following third-party Web page for authentication. Please confirm the security of that website yourself.',
 
   // Wiki
   knowledge_base: 'Knowledge Base',

translation/zh-CN.ts

@@ -106,6 +106,8 @@ export default {
   // Signature page
   sign: '签名',
   generate_key_pair: '生成密钥对',
+  signature_disclaimer:
+    '本页为公共服务，基于 Web crypto API 提供生成密钥对和签名功能。由于网页浏览器的沙盒环境，生成的私钥仅安全地保存在用户本地，公钥、签名会传给以下第三方网页用于身份验证，请自行确认该网站的安全性。',
 
   // Wiki
   knowledge_base: '知识库',

translation/zh-TW.ts

@@ -106,6 +106,8 @@ export default {
   // Signature page
   sign: '簽名',
   generate_key_pair: '生成密鑰對',
+  signature_disclaimer:
+    '本頁為公共服務，基於 Web crypto API 提供生成密鑰對和簽名功能。由於網頁瀏覽器的沙盒環境，生成的私鑰僅安全地保存在用戶本地，公鑰、簽名會傳給以下第三方網頁用於身份驗證，請自行確認該網站的安全性。',
 
   // Wiki
   knowledge_base: '知識庫',