(C) GeoOp OAuth2 Authorisation Code Grant (Public App)

Demonstrates how to get an access token for a GeoOp Third-Party Public Application using the Authorisation Code Grant flow.

Note: This example requires Chilkat v9.5.0.63 or greater.

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#include <C_CkOAuth2.h>
#include <C_CkFileAccess.h>

void ChilkatSample(void)
    {
    HCkOAuth2 oauth2;
    BOOL success;
    const char *url;
    int numMsWaited;
    HCkFileAccess fac;

    // Note: This example requires Chilkat v9.5.0.63 or greater.

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

    oauth2 = CkOAuth2_Create();

    // This should match the Site URL configured for your GeoOp Application, such as "http://localhost:3017/"
    CkOAuth2_putListenPort(oauth2,3017);

    CkOAuth2_putAuthorizationEndpoint(oauth2,"https://login.geoop.com/oauth2/code");
    CkOAuth2_putTokenEndpoint(oauth2,"https://login.geoop.com/oauth2/token");

    // Replace the client ID with an actual value.
    CkOAuth2_putClientId(oauth2,"GEOOP-CLIENT-ID");
    // The ClientSecret should remain empty for a GeoOp public application
    CkOAuth2_putClientSecret(oauth2,"");

    // We need a few special settings for GeoOp
    CkOAuth2_putScope(oauth2,"default");
    CkOAuth2_putCodeChallenge(oauth2,FALSE);
    // Setting LocalHost equal to "none" prevents the "redirect_uri" query param from being sent in the initial HTTP request.
    // Note: The GeoOp Application should still have a redirect URL specified as "http://localhost:3017/", where the port
    // number matches the ListenPort above.
    CkOAuth2_putLocalHost(oauth2,"none");

    // Begin the OAuth2 three-legged flow.  This returns a URL that should be loaded in a browser.
    url = CkOAuth2_startAuth(oauth2);
    if (CkOAuth2_getLastMethodSuccess(oauth2) != TRUE) {
        printf("%s\n",CkOAuth2_lastErrorText(oauth2));
        CkOAuth2_Dispose(oauth2);
        return;
    }

    // At this point, your application should load the URL in a browser.
    // For example, 
    // in C#:  System.Diagnostics.Process.Start(url);
    // in Java: Desktop.getDesktop().browse(new URI(url));
    // in VBScript: Set wsh=WScript.CreateObject("WScript.Shell")
    //              wsh.Run url
    // in Xojo: ShowURL(url)  (see http://docs.xojo.com/index.php/ShowURL)
    // in Dataflex: Runprogram Background "c:\Program Files\Internet Explorer\iexplore.exe" sUrl        
    // The GeoOp account owner would interactively accept or deny the authorization request.
    // System.Diagnostics.Process.Start(url);

    // Add the code to load the url in a web browser here...
    // Add the code to load the url in a web browser here...
    // Add the code to load the url in a web browser here...

    // Now wait for the authorization.
    // We'll wait for a max of 30 seconds.
    numMsWaited = 0;
    while ((numMsWaited < 30000) && (CkOAuth2_getAuthFlowState(oauth2) < 3)) {
        CkOAuth2_SleepMs(oauth2,100);
        numMsWaited = numMsWaited + 100;
    }

    // If there was no response from the browser within 30 seconds, then 
    // the AuthFlowState will be equal to 1 or 2.
    // 1: Waiting for Redirect. The OAuth2 background thread is waiting to receive the redirect HTTP request from the browser.
    // 2: Waiting for Final Response. The OAuth2 background thread is waiting for the final access token response.
    // In that case, cancel the background task started in the call to StartAuth.
    if (CkOAuth2_getAuthFlowState(oauth2) < 3) {
        CkOAuth2_Cancel(oauth2);
        printf("No response from the browser!\n");
        CkOAuth2_Dispose(oauth2);
        return;
    }

    // Check the AuthFlowState to see if authorization was granted, denied, or if some error occurred
    // The possible AuthFlowState values are:
    // 3: Completed with Success. The OAuth2 flow has completed, the background thread exited, and the successful JSON response is available in AccessTokenResponse property.
    // 4: Completed with Access Denied. The OAuth2 flow has completed, the background thread exited, and the error JSON is available in AccessTokenResponse property.
    // 5: Failed Prior to Completion. The OAuth2 flow failed to complete, the background thread exited, and the error information is available in the FailureInfo property.
    if (CkOAuth2_getAuthFlowState(oauth2) == 5) {
        printf("OAuth2 failed to complete.\n");
        printf("%s\n",CkOAuth2_failureInfo(oauth2));
        CkOAuth2_Dispose(oauth2);
        return;
    }

    if (CkOAuth2_getAuthFlowState(oauth2) == 4) {
        printf("OAuth2 authorization was denied.\n");
        printf("%s\n",CkOAuth2_accessTokenResponse(oauth2));
        CkOAuth2_Dispose(oauth2);
        return;
    }

    if (CkOAuth2_getAuthFlowState(oauth2) != 3) {
        printf("Unexpected AuthFlowState:%d\n",CkOAuth2_getAuthFlowState(oauth2));
        CkOAuth2_Dispose(oauth2);
        return;
    }

    printf("OAuth2 authorization granted!\n");
    printf("Access Token = %s\n",CkOAuth2_accessToken(oauth2));

    // Save the entire JSON response, which includes the access token, for future calls.
    // The JSON AccessTokenResponse looks like this:
    // {"access_token":"e6dqdG....mzjpT04w==","token_type":"Bearer","expires_in":2592000,"owner_id":984236}

    fac = CkFileAccess_Create();
    CkFileAccess_WriteEntireTextFile(fac,"qa_data/tokens/geoop.json",CkOAuth2_accessTokenResponse(oauth2),"utf-8",FALSE);

    printf("Success.\n");


    CkOAuth2_Dispose(oauth2);
    CkFileAccess_Dispose(fac);

    }