From 93053b0e8ae39e33454697407d0492723fef7d1a Mon Sep 17 00:00:00 2001
From: yangzhe <yangzhe@qq.com>
Date: Thu, 10 Jul 2025 09:52:24 +0800
Subject: [PATCH] =?UTF-8?q?feat:=20=E5=A2=9E=E5=8A=A0jwt-util=E5=B7=A5?=
 =?UTF-8?q?=E5=85=B7=E5=BA=93?=
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---
 utils/jwt-util.js | 83 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 83 insertions(+)
 create mode 100644 utils/jwt-util.js

diff --git a/utils/jwt-util.js b/utils/jwt-util.js
new file mode 100644
index 0000000..0ed043a
--- /dev/null
+++ b/utils/jwt-util.js
@@ -0,0 +1,83 @@
+/**
+ * JWT解析工具
+ */
+
+/**
+ * 解析JWT令牌
+ * @param {string} token JWT令牌
+ * @returns {Object} 解析后的用户信息
+ */
+export function parseJWT(token) {
+  try {
+    // 将JWT分割为三部分
+    const parts = token.split('.');
+    if (parts.length !== 3) {
+      throw new Error('无效的JWT格式');
+    }
+    
+    // 解码载荷部分（第二部分）
+    const payload = parts[1];
+    const decodedPayload = decodeBase64URL(payload);
+    const payloadObj = JSON.parse(decodedPayload);
+    
+    // 如果存在UserInfo字段，解析它
+    if (payloadObj.UserInfo) {
+      try {
+        payloadObj.UserInfo = JSON.parse(payloadObj.UserInfo);
+      } catch (e) {
+        console.error('解析UserInfo失败:', e);
+      }
+    }
+    
+    return payloadObj;
+  } catch (error) {
+    console.error('JWT解析失败:', error);
+    return null;
+  }
+}
+
+/**
+ * 解码Base64URL编码的字符串
+ * @param {string} base64Url Base64URL编码的字符串
+ * @returns {string} 解码后的字符串
+ */
+function decodeBase64URL(base64Url) {
+  // 将Base64URL转换为标准Base64
+  const base64 = base64Url.replace(/-/g, '+').replace(/_/g, '/');
+  
+  // 添加填充字符
+  const padding = '='.repeat((4 - base64.length % 4) % 4);
+  const base64Padded = base64 + padding;
+  
+  // 解码Base64
+  try {
+    // 浏览器环境
+    return decodeURIComponent(
+      atob(base64Padded)
+        .split('')
+        .map(c => '%' + ('00' + c.charCodeAt(0).toString(16)).slice(-2))
+        .join('')
+    );
+  } catch (e) {
+    // Node.js环境或其他环境
+    try {
+      return Buffer.from(base64Padded, 'base64').toString('utf-8');
+    } catch (e2) {
+      console.error('Base64解码失败:', e2);
+      return '';
+    }
+  }
+}
+
+/**
+ * 从JWT中获取用户信息
+ * @param {string} token JWT令牌
+ * @returns {Object} 用户信息对象
+ */
+export function getUserInfoFromJWT(token) {
+  const parsedToken = parseJWT(token);
+  if (!parsedToken || !parsedToken.UserInfo) {
+    return null;
+  }
+  return parsedToken.UserInfo;
+} 
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