(Unicode C) Office365 Refresh OAuth2 Access Token for SMTP, IMAP, POP

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Demonstrates how to refresh an Office365 OAuth2 access token for use in the SMTP, IMAP, and POP3 protocols.

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#include <C_CkJsonObjectW.h>
#include <C_CkOAuth2W.h>
#include <C_CkStringBuilderW.h>

void ChilkatSample(void)
    {
    HCkJsonObjectW jsonToken;
    BOOL success;
    HCkOAuth2W oauth2;
    HCkStringBuilderW sbJson;

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

    // It is assumed we previously obtained an OAuth2 access token.
    // This example loads the JSON access token file 
    // saved by this example: Get Office365 SMTP/IMAP/POP3 OAuth2 Access Token

    // Note: Refreshing an access token does not require user-interaction.  
    // Only the act of getting the initial access token requires interactive authorization from the Office365 account owner 
    // (i.e. a browser is displayed and the account owner authorizes access by the app).

    // Once you have the initial access token, it can be refreshed over and over again with no limits.
    // A typical strategy is to write your application to automatically refresh the access token 
    // when authentication fails, and then retry the operation with the new access token.
    // For example, see Auto-Refresh O365 Access Token when Sending Email

    jsonToken = CkJsonObjectW_Create();
    success = CkJsonObjectW_LoadFile(jsonToken,L"qa_data/tokens/office365.json");
    if (success != TRUE) {
        wprintf(L"Failed to load office365.json\n");
        CkJsonObjectW_Dispose(jsonToken);
        return;
    }

    // The access token JSON looks like this:

    // {
    //   "token_type": "Bearer",
    //   "scope": "IMAP.AccessAsUser.All openid POP.AccessAsUser.All profile SMTP.Send email",
    //   "expires_in": 3599,
    //   "ext_expires_in": 3599,
    //   "access_token": "...",
    //   "refresh_token": "...",
    //   "id_token": "...",
    //   "expires_on": "1592748507"
    // }

    oauth2 = CkOAuth2W_Create();

    // Update to use your token endpoint.
    // In the Azure Portal, in "App registrations", go to "Endpoints" (located to the right of the "+ New registration" link.)
    //    Find your endpoint for the "OAuth 2.0 token endpoint (v2)"
    //    See Office365 OAuth2 Endpoints

    CkOAuth2W_putTokenEndpoint(oauth2,L"https://login.microsoftonline.com/xxxxxxxxxx-71bf-4ebe-a866-738364321bf2/oauth2/v2.0/token");

    // Replace these with actual values.
    CkOAuth2W_putClientId(oauth2,L"CLIENT_ID");
    CkOAuth2W_putClientSecret(oauth2,L"CLIENT_SECRET");

    // Get the "refresh_token"
    CkOAuth2W_putRefreshToken(oauth2,CkJsonObjectW_stringOf(jsonToken,L"refresh_token"));

    // Send the HTTP POST to refresh the access token..
    success = CkOAuth2W_RefreshAccessToken(oauth2);
    if (success != TRUE) {
        wprintf(L"%s\n",CkOAuth2W_lastErrorText(oauth2));
        CkJsonObjectW_Dispose(jsonToken);
        CkOAuth2W_Dispose(oauth2);
        return;
    }

    wprintf(L"New access token: %s\n",CkOAuth2W_accessToken(oauth2));
    wprintf(L"New refresh token: %s\n",CkOAuth2W_refreshToken(oauth2));

    // Update the JSON with the new tokens.
    CkJsonObjectW_UpdateString(jsonToken,L"access_token",CkOAuth2W_accessToken(oauth2));
    CkJsonObjectW_UpdateString(jsonToken,L"refresh_token",CkOAuth2W_refreshToken(oauth2));

    // Save the new JSON access token response to a file.
    sbJson = CkStringBuilderW_Create();
    CkJsonObjectW_putEmitCompact(jsonToken,FALSE);
    CkJsonObjectW_EmitSb(jsonToken,sbJson);
    CkStringBuilderW_WriteFile(sbJson,L"qa_data/tokens/office365.json",L"utf-8",FALSE);

    wprintf(L"OAuth2 authorization granted!\n");
    wprintf(L"New Access Token = %s\n",CkOAuth2W_accessToken(oauth2));


    CkJsonObjectW_Dispose(jsonToken);
    CkOAuth2W_Dispose(oauth2);
    CkStringBuilderW_Dispose(sbJson);

    }