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سوال:
write and example to use auth2 in drogon c++ web freamwork and write server and client examples

جواب :
Drogon is a high-performance C++ web framework that supports OAuth2 authentication. In this example, we'll create a simple OAuth2 server and client using Drogon. We'll use the authorization code grant flow in this example.

First, let's create the OAuth2 server:

OAuth2Server/main.cpp

#include <drogon/drogon.h>
#include <drogon/orm/DbClient.h>
#include <drogon/orm/RestfulController.h>
#include <drogon/auth/OAuth2.h>

using namespace drogon;

int main()
{
    // Initialize Drogon
    drogon::app().loadConfigFile("config.json");

    // Set up OAuth2 provider
    auto oauth2 = drogon::OAuth2::newOAuth2Provider()
                    .clientId("your_client_id")
                    .clientSecret("your_client_secret")
                    .authorizationEndpoint("/oauth2/authorize")
                    .tokenEndpoint("/oauth2/token")
                    .build();

    // Register OAuth2 provider
    drogon::app().registerOAuth2Provider(oauth2);

    // Start the server
    drogon::app().run();

    return 0;
}

OAuth2Server/config.json

{
    "app": {
        "threads_num": 1
    },
    "listeners": [
        {
            "address": "0.0.0.0",
            "port": 8080,
            "https": false
        }
    ]
}

Now, let's create the OAuth2 client:

OAuth2Client/main.cpp

#include <drogon/drogon.h>
#include <drogon/auth/OAuth2.h>

using namespace drogon;

int main()
{
    // Initialize Drogon
    drogon::app().loadConfigFile("config.json");

    // Set up OAuth2 client
    auto oauth2Client = drogon::OAuth2::newOAuth2Client()
                         .clientId("your_client_id")
                         .clientSecret("your_client_secret")
                         .authorizationEndpoint("http://localhost:8080/oauth2/authorize")
                         .tokenEndpoint("http://localhost:8080/oauth2/token")
                         .build();

    // Register OAuth2 client
    drogon::app().registerOAuth2Client(oauth2Client);

    // Start the client
    drogon::app().run();

    return 0;
}

OAuth2Client/config.json

{
    "app": {
        "threads_num": 1
    },
    "listeners": [
        {
            "address": "0.0.0.0",
            "port": 8081,
            "https": false
        }
    ]
}

To test the OAuth2 server and client, run both applications and access the client's authorization endpoint using a web browser. The user will be redirected to the server's authorization endpoint and then back to the client after successful authentication. The client will then use the authorization code to request an access token from the server's token endpoint.

Please note that this example is just a starting point and doesn't include the implementation of user authentication or resource protection. You'll need to implement these features according to your application's requirements. You can find more information about Drogon and its OAuth2 support in the official documentation.

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