(Unicode C) OAuth2 using an HTTP Proxy (for a Desktop Application)

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

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#include <C_CkSocketW.h>
#include <C_CkOAuth2W.h>
#include <C_CkJsonObjectW.h>
#include <C_CkDateTimeW.h>
#include <C_CkFileAccessW.h>

void ChilkatSample(void)
    {
    HCkSocketW socket;
    HCkOAuth2W oauth2;
    BOOL success;
    const wchar_t *url;
    int numMsWaited;
    HCkJsonObjectW json;
    HCkDateTimeW dtExpire;
    HCkFileAccessW fac;

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

    // To use an HTTP proxy with OAuth2, create a Chilkat socket object and specify the details.
    socket = CkSocketW_Create();
    // Use your HTTP proxy server domain or IP address.
    CkSocketW_putHttpProxyHostname(socket,L"myproxyserver.com");
    // Change this to the listening port of your HTTP proxy server (if necessary)
    CkSocketW_putHttpProxyPort(socket,808);
    // Specify login/password if needed.
    CkSocketW_putHttpProxyUsername(socket,L"myProxyLogin");
    CkSocketW_putHttpProxyPassword(socket,L"myProxyPassword");
    CkSocketW_putHttpProxyForHttp(socket,TRUE);

    oauth2 = CkOAuth2W_Create();

    // We don't need to connect the socket beforehand.
    // Just tell oauth2 to use the socket which has the HTTP proxy properties.
    success = CkOAuth2W_UseConnection(oauth2,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.
    CkOAuth2W_putListenPort(oauth2,3017);

    CkOAuth2W_putAuthorizationEndpoint(oauth2,L"https://login.microsoftonline.com/common/oauth2/v2.0/authorize");
    CkOAuth2W_putTokenEndpoint(oauth2,L"https://login.microsoftonline.com/common/oauth2/v2.0/token");

    // Replace these with actual values.
    CkOAuth2W_putClientId(oauth2,L"MICROSOFT-GRAPH-CLIENT-ID");
    // This is your app password:
    CkOAuth2W_putClientSecret(oauth2,L"MICROSOFT-GRAPH-CLIENT-SECRET");

    CkOAuth2W_putCodeChallenge(oauth2,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
    CkOAuth2W_putScope(oauth2,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.
    url = CkOAuth2W_startAuth(oauth2);
    if (CkOAuth2W_getLastMethodSuccess(oauth2) != TRUE) {
        wprintf(L"%s\n",CkOAuth2W_lastErrorText(oauth2));
        CkSocketW_Dispose(socket);
        CkOAuth2W_Dispose(oauth2);
        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 = CkOAuth2W_LaunchBrowser(oauth2,url);
    if (success == FALSE) {
        wprintf(L"%s\n",CkOAuth2W_lastErrorText(oauth2));
        CkSocketW_Dispose(socket);
        CkOAuth2W_Dispose(oauth2);
        return;
    }

    // Wait for the user to approve or deny authorization in the browser.
    numMsWaited = 0;
    while ((numMsWaited < 90000) && (CkOAuth2W_getAuthFlowState(oauth2) < 3)) {
        CkOAuth2W_SleepMs(oauth2,100);
        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 (CkOAuth2W_getAuthFlowState(oauth2) < 3) {
        CkOAuth2W_Cancel(oauth2);
        wprintf(L"No response from the browser!\n");
        CkSocketW_Dispose(socket);
        CkOAuth2W_Dispose(oauth2);
        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 (CkOAuth2W_getAuthFlowState(oauth2) == 5) {
        wprintf(L"OAuth2 failed to complete.\n");
        wprintf(L"%s\n",CkOAuth2W_failureInfo(oauth2));
        CkSocketW_Dispose(socket);
        CkOAuth2W_Dispose(oauth2);
        return;
    }

    if (CkOAuth2W_getAuthFlowState(oauth2) == 4) {
        wprintf(L"OAuth2 authorization was denied.\n");
        wprintf(L"%s\n",CkOAuth2W_accessTokenResponse(oauth2));
        CkSocketW_Dispose(socket);
        CkOAuth2W_Dispose(oauth2);
        return;
    }

    if (CkOAuth2W_getAuthFlowState(oauth2) != 3) {
        wprintf(L"Unexpected AuthFlowState:%d\n",CkOAuth2W_getAuthFlowState(oauth2));
        CkSocketW_Dispose(socket);
        CkOAuth2W_Dispose(oauth2);
        return;
    }

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

    // Get the full JSON response:
    json = CkJsonObjectW_Create();
    CkJsonObjectW_Load(json,CkOAuth2W_accessTokenResponse(oauth2));
    CkJsonObjectW_putEmitCompact(json,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 (CkJsonObjectW_HasMember(json,L"expires_on") != TRUE) {
        dtExpire = CkDateTimeW_Create();
        CkDateTimeW_SetFromCurrentSystemTime(dtExpire);
        CkDateTimeW_AddSeconds(dtExpire,CkJsonObjectW_IntOf(json,L"expires_in"));
        CkJsonObjectW_AppendString(json,L"expires_on",CkDateTimeW_getAsUnixTimeStr(dtExpire,FALSE));
    }

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

    // Save the JSON to a file for future requests.
    fac = CkFileAccessW_Create();
    CkFileAccessW_WriteEntireTextFile(fac,L"qa_data/tokens/microsoftGraph.json",CkJsonObjectW_emit(json),L"utf-8",FALSE);


    CkSocketW_Dispose(socket);
    CkOAuth2W_Dispose(oauth2);
    CkJsonObjectW_Dispose(json);
    CkDateTimeW_Dispose(dtExpire);
    CkFileAccessW_Dispose(fac);

    }