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<h1>Timestamp Request Validation</h1>
<p>Timestamp request validation is mainly used to prevent replay attacks. The principle is to include a timestamp (usually
in milliseconds) in each request, and the backend checks whether the timestamp falls within an allowed time window. This
is often used together with a signature mechanism to ensure the timeliness and uniqueness of the request, but it can
also be used standalone.</p>
<p>Usage scenarios: When resetting a password, the URL sent should include this encrypted timestamp as a parameter; for
APIs with high confidentiality, and for server-to-server calls (not browser calls, because if the key is stored in the
browser, it is not secure).</p>
<h2>Common Validation Logic</h2>
<ol>
<li>The client includes the timestamp (e.g., parameter <code>timestamp=xxx</code>) ciphertext in the request. This timestamp
ciphertext is generated by a secret key and stored by either the server or client (be careful not to leak it).</li>
<li>The backend checks whether the difference between the current server time and the request timestamp is within a
reasonable range (e.g., ±5 minutes).</li>
<li>If the request is expired, it is rejected.</li>
</ol>
<p>Replay attack: Timestamp validation alone cannot prevent the same request from being submitted multiple times. You need
to use a unique <code>nonce</code> along with it and, for interfaces with business idempotency requirements, also check whether
the <code>nonce</code> has already been used.</p>
<h1>Usage</h1>
<h2>YAML Configuration</h2>
<p>Currently, AES symmetric encryption is used. Add your AES secret key.</p>
<pre><code class="language-yaml">security:
TimeSignature: # Timestamp control
enabled: true
secretKey: der3@x7Az#2 # Secret key, required
</code></pre>
<h2>Interceptor Validation</h2>
<p>Add the <code>@TimeSignatureVerify</code> annotation to the interface in use:</p>
<pre><code class="language-java">@GetMapping("/TimeSignatureVerify")
@TimeSignatureVerify
int TimeSignatureVerify();
</code></pre>
<h2>Generate Timestamp Token</h2>
<p>Distribute the token as a parameter in your business code.</p>
<pre><code class="language-java">// Static method call
String token = SecurityInterceptor.getBean(TimeSignature.class).generateSignature();
</code></pre>
<h1>Roadmap</h1>
<p>More complex encryption rules, separate configuration for each annotation</p>
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