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 <C_CkJsonObject.h>
#include <C_CkImap.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkJsonObject json;
    const char *accessToken;
    HCkImap imap;

    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"
    // 	}
    // 
    json = CkJsonObject_Create();
    success = CkJsonObject_LoadFile(json,"qa_data/tokens/_gmailFullAccess.json");
    if (success != TRUE) {
        printf("Failed to load GMail access token file.\n");
        CkJsonObject_Dispose(json);
        return;
    }

    accessToken = CkJsonObject_stringOf(json,"access_token");

    // Do OAuth2 authentication by using the access token as the password in the Login method below...
    imap = CkImap_Create();

    CkImap_putSsl(imap,TRUE);
    CkImap_putPort(imap,993);

    // Connect to the GMail IMAP server.
    success = CkImap_Connect(imap,"imap.gmail.com");
    if (success != TRUE) {
        printf("%s\n",CkImap_lastErrorText(imap));
        CkJsonObject_Dispose(json);
        CkImap_Dispose(imap);
        return;
    }

    // Indicate that XOAUTH2 authentication is to be used:
    CkImap_putAuthMethod(imap,"XOAUTH2");

    // Login
    // Use the email address of the GMail account that granted authorization.
    success = CkImap_Login(imap,"user@gmail.com",accessToken);
    if (success != TRUE) {
        printf("%s\n",CkImap_lastErrorText(imap));
    }
    else {
        printf("Successfully authenticated with GMail IMAP using XOAUTH2!\n");
    }



    CkJsonObject_Dispose(json);
    CkImap_Dispose(imap);

    }