(C) Office365 IMAP OAuth2 with Shared Mailbox

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Demonstrates how to authenticate using OAuth2 with shared mailboxes in outlook.office365.com. (SASL XOAUTH2 authentication for shared mailboxes in Office 365)

For more information, see https://docs.microsoft.com/en-us/exchange/client-developer/legacy-protocols/how-to-authenticate-an-imap-pop-smtp-application-by-using-oauth#sasl-xoauth2-authentication-for-shared-mailboxes-in-office-365

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

void ChilkatSample(void)
    {
    HCkJsonObject jsonToken;
    BOOL success;
    HCkImap imap;

    // An Office365 OAuth2 access token must first be obtained prior
    // to running this code.

    // Getting the OAuth2 access token for the 1st time requires the O365 account owner's 
    // interactive authorizaition via a web browser.  Afterwards, the access token
    // can be repeatedly refreshed automatically.

    // See the following examples for getting and refreshing an OAuth2 access token

    // Get Office365 SMTP/IMAP/POP3 OAuth2 Access Token
    // Refresh Office365 SMTP/IMAP/POP3 OAuth2 Access Token

    // First get our previously obtained OAuth2 access token.
    jsonToken = CkJsonObject_Create();
    success = CkJsonObject_LoadFile(jsonToken,"qa_data/tokens/office365.json");
    if (success == FALSE) {
        printf("Failed to open the office365 OAuth JSON file.\n");
        CkJsonObject_Dispose(jsonToken);
        return;
    }

    imap = CkImap_Create();

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

    // Connect to the Office365 IMAP server.
    success = CkImap_Connect(imap,"outlook.office365.com");
    if (success != TRUE) {
        printf("%s\n",CkImap_lastErrorText(imap));
        CkJsonObject_Dispose(jsonToken);
        CkImap_Dispose(imap);
        return;
    }

    // Use OAuth2 authentication.
    CkImap_putAuthMethod(imap,"XOAUTH2");

    // In case of shared mailbox access using OAuth, application needs to obtain the access token on behalf of a user
    // but replace the userName field in the SASL XOAUTH2 encoded string with the email address of the shared mailbox.

    // Login using the shared mailbox email address for the username, and the access token for the password.
    // This will cause the SASL XOAUTH2 format to be used, as described at Office 365 SASL XOAUTH2 format 

    success = CkImap_Login(imap,"SHARED_MAILBOX_EMAIL_ADDRESS",CkJsonObject_stringOf(jsonToken,"access_token"));
    if (success != TRUE) {
        printf("%s\n",CkImap_lastErrorText(imap));
        CkJsonObject_Dispose(jsonToken);
        CkImap_Dispose(imap);
        return;
    }

    printf("O365 OAuth2 shared mailbox authentication is successful.\n");

    // Do something...
    success = CkImap_SelectMailbox(imap,"Inbox");
    if (success != TRUE) {
        printf("%s\n",CkImap_lastErrorText(imap));
        CkJsonObject_Dispose(jsonToken);
        CkImap_Dispose(imap);
        return;
    }

    // Your application can continue to do other things in the IMAP session....

    // When finished, logout and close the connection.
    success = CkImap_Logout(imap);
    success = CkImap_Disconnect(imap);

    printf("Finished.\n");


    CkJsonObject_Dispose(jsonToken);
    CkImap_Dispose(imap);

    }