(Unicode C++) OAuth2 using a SOCKS Proxy (for a Desktop Application)

Demonstrates how to send OAuth2 communications through a SOCKS proxy for a desktop application. The technique is the same for all OAuth2 applications. This one happens to demonstrate for Microsoft Graph.

Note: This example requires Chilkat v10.1.2 or greater.

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#include <CkSocketW.h>
#include <CkOAuth2W.h>
#include <CkJsonObjectW.h>
#include <CkDateTimeW.h>
#include <CkFileAccessW.h>

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

    // To use a SOCKS proxy with OAuth2, create a Chilkat socket object and specify the details for the
    // SOCKS proxy server (SOCKS4 or SOCKS5).
    CkSocketW socket;
    // Use your SOCKS proxy server domain or IP address.
    socket.put_SocksHostname(L"mysocksproxyserver.com");
    // Change this to the listening port of your SOCKS proxy server (if necessary)
    socket.put_SocksPort(1080);
    socket.put_SocksUsername(L"myProxyLogin");
    socket.put_SocksPassword(L"myProxyPassword");
    // Set the SOCKS version to 4 or 5 based on the version
    // of the SOCKS proxy server:
    socket.put_SocksVersion(5);
    // Note: SOCKS4 servers only support usernames without passwords.
    // SOCKS5 servers support full login/password authentication.

    CkOAuth2W oauth2;

    // We don't need to connect the socket beforehand.
    // Just tell oauth2 to use the socket which has the SOCKS proxy properties.
    bool success = oauth2.UseConnection(socket);

    // This should be the port in the localhost callback URL for your app.  
    // The callback URL would look like "http://localhost:3017/" if the port number is 3017.
    oauth2.put_ListenPort(3017);

    oauth2.put_AuthorizationEndpoint(L"https://login.microsoftonline.com/common/oauth2/v2.0/authorize");
    oauth2.put_TokenEndpoint(L"https://login.microsoftonline.com/common/oauth2/v2.0/token");

    // Replace these with actual values.
    oauth2.put_ClientId(L"MICROSOFT-GRAPH-CLIENT-ID");
    // This is your app password:
    oauth2.put_ClientSecret(L"MICROSOFT-GRAPH-CLIENT-SECRET");

    oauth2.put_CodeChallenge(false);
    // Provide a SPACE separated list of scopes.
    // See https://developer.microsoft.com/en-us/graph/docs/authorization/permission_scopes 

    // Important: To get a refresh token in the final response, you have to ask for "offline_access" scope
    oauth2.put_Scope(L"openid profile offline_access user.readwrite mail.readwrite mail.send files.readwrite");

    // Begin the OAuth2 Authorization code flow.  This returns a URL that should be loaded in a browser.
    const wchar_t *url = oauth2.startAuth();
    if (oauth2.get_LastMethodSuccess() != true) {
        wprintf(L"%s\n",oauth2.lastErrorText());
        return;
    }

    wprintf(L"url = %s\n",url);

    // Launch the default browser on the system and navigate to the url.
    // The LaunchBrowser method was added in Chilkat v10.1.2.
    success = oauth2.LaunchBrowser(url);
    if (success == false) {
        wprintf(L"%s\n",oauth2.lastErrorText());
        return;
    }

    // Wait for the user to approve or deny authorization in the browser.
    int numMsWaited = 0;
    while ((numMsWaited < 90000) && (oauth2.get_AuthFlowState() < 3)) {
        oauth2.SleepMs(100);
        numMsWaited = numMsWaited + 100;
    }

    // If the browser does not respond within the specified time, AuthFlowState will be:
    // 
    // 1: Waiting for Redirect - The OAuth2 background thread is waiting for the browser's redirect request.
    // 2: Waiting for Final Response - The thread is awaiting the final access token response.
    // In either case, cancel the background task initiated by StartAuth.

    if (oauth2.get_AuthFlowState() < 3) {
        oauth2.Cancel();
        wprintf(L"No response from the browser!\n");
        return;
    }

    // Check AuthFlowState to determine if authorization was granted, denied, or failed:
    // 
    // 3: Success - OAuth2 flow completed, the background thread exited, and the successful response is in AccessTokenResponse.
    // 4: Access Denied - OAuth2 flow completed, the background thread exited, and the error response is in AccessTokenResponse.
    // 5: Failure - OAuth2 flow failed before completion, the background thread exited, and error details are in FailureInfo.

    if (oauth2.get_AuthFlowState() == 5) {
        wprintf(L"OAuth2 failed to complete.\n");
        wprintf(L"%s\n",oauth2.failureInfo());
        return;
    }

    if (oauth2.get_AuthFlowState() == 4) {
        wprintf(L"OAuth2 authorization was denied.\n");
        wprintf(L"%s\n",oauth2.accessTokenResponse());
        return;
    }

    if (oauth2.get_AuthFlowState() != 3) {
        wprintf(L"Unexpected AuthFlowState:%d\n",oauth2.get_AuthFlowState());
        return;
    }

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

    // Get the full JSON response:
    CkJsonObjectW json;
    json.Load(oauth2.accessTokenResponse());
    json.put_EmitCompact(false);

    // The JSON response looks like this:

    // {
    //   "token_type": "Bearer",
    //   "scope": "User.Read Mail.ReadWrite Mail.Send",
    //   "expires_in": 3600,
    //   "ext_expires_in": 0,
    //   "access_token": "EwBAA8l6B...",
    //   "refresh_token": "MCRMdbe...",
    //   "id_token": "eyJ0eXA..."
    // }

    // If an "expires_on" member does not exist, then add the JSON member by
    // getting the current system date/time and adding the "expires_in" seconds.
    // This way we'll know when the token expires.
    if (json.HasMember(L"expires_on") != true) {
        CkDateTimeW dtExpire;
        dtExpire.SetFromCurrentSystemTime();
        dtExpire.AddSeconds(json.IntOf(L"expires_in"));
        json.AppendString(L"expires_on",dtExpire.getAsUnixTimeStr(false));
    }

    wprintf(L"%s\n",json.emit());

    // Save the JSON to a file for future requests.
    CkFileAccessW fac;
    fac.WriteEntireTextFile(L"qa_data/tokens/microsoftGraph.json",json.emit(),L"utf-8",false);
    }