feat：智谱Ai签名Token工具类

src/main/java/cn/bugstack/chatglm/utils/BearerTokenUtils.java

+package cn.bugstack.chatglm.utils;
+
+import com.auth0.jwt.JWT;
+import com.auth0.jwt.algorithms.Algorithm;
+import com.google.common.cache.Cache;
+import com.google.common.cache.CacheBuilder;
+import lombok.extern.slf4j.Slf4j;
+
+import java.nio.charset.StandardCharsets;
+import java.util.Calendar;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.concurrent.TimeUnit;
+
+/**
+ * @author 小傅哥，微信：fustack
+ * @description 签名工具包；过期时间30分钟，缓存时间29分钟
+ * @github https://github.com/fuzhengwei
+ * @Copyright 公众号：bugstack虫洞栈 | 博客：https://bugstack.cn - 沉淀、分享、成长，让自己和他人都能有所收获！
+ */
+@Slf4j
+public class BearerTokenUtils {
+
+    // 过期时间；默认30分钟
+    private static final int expireMillis = 30 * 60 * 1000;
+
+    // 缓存服务
+    public static Cache<String, String> cache = CacheBuilder.newBuilder()
+            .expireAfterWrite(expireMillis - (60 * 1000), TimeUnit.MINUTES)
+            .build();
+
+    /**
+     * 对 ApiKey 进行签名
+     *
+     * @param apiKey    登录创建 ApiKey <a href="https://open.bigmodel.cn/usercenter/apikeys">apikeys</a>
+     * @param apiSecret apiKey的后半部分 828902ec516c45307619708d3e780ae1.w5eKiLvhnLP8MtIf 取 w5eKiLvhnLP8MtIf 使用
+     * @return Token
+     */
+    public static String getToken(String apiKey, String apiSecret) {
+        // 缓存Token
+        String token = cache.getIfPresent(apiKey);
+        if (null != token) return token;
+        // 创建Token
+        Algorithm algorithm = Algorithm.HMAC256(apiSecret.getBytes(StandardCharsets.UTF_8));
+        Map<String, Object> payload = new HashMap<>();
+        payload.put("api_key", apiKey);
+        payload.put("exp", System.currentTimeMillis() + expireMillis);
+        payload.put("timestamp", Calendar.getInstance().getTimeInMillis());
+        Map<String, Object> headerClaims = new HashMap<>();
+        headerClaims.put("alg", "HS256");
+        headerClaims.put("sign_type", "SIGN");
+        token = JWT.create().withPayload(payload).withHeader(headerClaims).sign(algorithm);
+        cache.put(apiKey, token);
+        return token;
+    }
+
+}