C++

GMail IMAP Authentication using OAuth2 Access Token

See more GMail SMTP/IMAP/POP Examples

Demonstrates how to do IMAP OAuth2 authentication for GMail (or any other IMAP mail server supporting OAuth2 authentication). This example assumes an OAuth2 access token was previously obtained. C++

#include <CkJsonObject.h>
#include <CkImap.h>

void ChilkatSample(void)
    {
    bool success = false;

    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    // See Get GMail IMAP OAuth2 Access Token for Desktop App 
    // for sample code showing how to obtain a GMail IMAP read/write access token.

    // In this example, our access token was previously saved to the following file which contains JSON like this:
    // 	{
    // 	 "access_token": "ya39.Ci-XA_C5bGgRDC3UaD-h0_NeL-DVIQnI2gHtBBBHkZzrwlARkwX6R3O0PCDEzRlfaQ",
    // 	 "token_type": "Bearer",
    // 	 "expires_in": 3600,
    // 	 "refresh_token": "1/r_2c_7jddspcdfesrrfKqfXtqo08D6Q-gUU0DsdfVMsx0c"
    // 	}
    // 
    CkJsonObject json;
    success = json.LoadFile("qa_data/tokens/_gmailFullAccess.json");
    if (success != true) {
        std::cout << "Failed to load GMail access token file." << "\r\n";
        return;
    }

    const char *accessToken = json.stringOf("access_token");

    // Do OAuth2 authentication by using the access token as the password in the Login method below...
    CkImap imap;

    imap.put_Ssl(true);
    imap.put_Port(993);

    // Connect to the GMail IMAP server.
    success = imap.Connect("imap.gmail.com");
    if (success != true) {
        std::cout << imap.lastErrorText() << "\r\n";
        return;
    }

    // Indicate that XOAUTH2 authentication is to be used:
    imap.put_AuthMethod("XOAUTH2");

    // Login
    // Use the email address of the GMail account that granted authorization.
    success = imap.Login("user@gmail.com",accessToken);
    if (success != true) {
        std::cout << imap.lastErrorText() << "\r\n";
    }
    else {
        std::cout << "Successfully authenticated with GMail IMAP using XOAUTH2!" << "\r\n";
    }
    }