Authentication and authorization are crucial aspects of REST APIs, ensuring that only authorized users can access and perform actions on protected resources.

When it comes to authentication, REST APIs commonly use methods such as API keys, tokens, and OAuth. API keys are typically provided to clients during registration and are included in API requests to authenticate the client. Tokens, on the other hand, are obtained through an authentication process and are used to verify the identity of users or clients on subsequent API requests. OAuth is an authorization framework that allows users to grant permissions to third-party applications without sharing their credentials.

Here's an example of authentication logic in C++:

1#include <iostream>
2#include <string>
3
4int main() {
5  std::string username;
6  std::string password;
7
8  // Get username and password from user input
9  std::cout << "Enter your username: ";
10  std::cin >> username;
11
12  std::cout << "Enter your password: ";
13  std::cin >> password;
14
15  // Validate username and password
16  if (username == "admin" && password == "password") {
17    std::cout << "Authentication successful!" << std::endl;
18  } else {
19    std::cout << "Authentication failed!" << std::endl;
20  }
21
22  return 0;
23}

For authorization, REST APIs commonly use role-based access control (RBAC) or access tokens. RBAC defines permissions based on the roles assigned to users, allowing fine-grained access control. Access tokens, similar to authentication tokens, are obtained through the authentication process but are used to enforce access control on resources. These tokens contain information about the user's permissions or roles and are validated by the API server before granting access.

Here's an example of authorization logic in C++:

1#include <iostream>
2
3int main() {
4  bool isAdmin = false; // Replace with actual logic to check user roles/permissions
5
6  if (isAdmin) {
7    std::cout << "Authorization granted!" << std::endl;
8  } else {
9    std::cout << "Authorization denied!" << std::endl;
10  }
11
12  return 0;
13}

By understanding and implementing authentication and authorization mechanisms, you can ensure the security and integrity of your REST API, allowing only authorized users to access protected resources.

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#include <iostream>

​

int main() {

  // Authentication logic

​

  // Authorization logic

​

  return 0;

}