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        "diff": "diff --git a/src/utils/auth.js b/src/utils/auth.js\nindex 1234567..abcdef0 100644\n--- a/src/utils/auth.js\n+++ b/src/utils/auth.js\n@@ -1,5 +1,6 @@\n import jwt from 'jsonwebtoken';\n \n+const JWT_SECRET = process.env.JWT_SECRET || 'supersecretkey'; // In production, use a strong, environment-specific secret\n const EXPIRATION_TIME = '1h';\n \n export const generateToken = (userId) => {\n@@ -10,7 +11,7 @@\n };\n \n export const verifyToken = (token) => {\n-  try {\n-    return jwt.verify(token, process.env.JWT_SECRET);\n+  if (!token) {\n+    throw new Error('No token provided');\n+  }\n+  try {\n+    return jwt.verify(token, JWT_SECRET);\n   } catch (error) {\n     console.error('Token verification failed:', error.message);\n     return null;\n@@ -20,3 +21,11 @@\n     return null;\n   }\n };\n+\n+export const decodeToken = (token) => {\n+  if (!token) {\n+    throw new Error('No token provided');\n+  }\n+  return jwt.decode(token);\n+};\n+\ndiff --git a/src/services/userService.js b/src/services/userService.js\nindex abcdef0..1234567 100644\n--- a/src/services/userService.js\n+++ b/src/services/userService.js\n@@ -1,5 +1,6 @@\n import User from '../models/User';\n import bcrypt from 'bcryptjs';\n+import { decodeToken } from '../utils/auth';\n \n export const createUser = async (userData) => {\n   const hashedPassword = await bcrypt.hash(userData.password, 10);\n@@ -18,3 +19,11 @@\n   return user;\n };\n \n+export const getUserFromToken = async (token) => {\n+  const decoded = decodeToken(token);\n+  if (!decoded || !decoded.userId) {\n+    throw new Error('Invalid token payload');\n+  }\n+  const user = await User.findById(decoded.userId);\n+  return user;\n+};\n+\n"
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