Unicode C++

LinkedIn OAuth2 Access Token

See more OAuth2 Examples

Demonstrates how to get a LinkedIn OAuth2 access token from a desktop application or script.

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

Unicode C++

#include <CkOAuth2W.h>
#include <CkStringBuilderW.h>

void ChilkatSample(void)
    {
    bool success = false;

    //  To further clarify, see OAuth 2.0 Authorization Flow

    CkOAuth2W oauth2;

    //  The port should match the Authorized Redirect URL in your LinkedIn app, 
    //  which would look like "http://localhost:3017/"
    //  See a screenshot below...
    oauth2.put_ListenPort(3017);

    oauth2.put_AuthorizationEndpoint(L"https://www.linkedin.com/oauth/v2/authorization");
    oauth2.put_TokenEndpoint(L"https://www.linkedin.com/oauth/v2/accessToken");

    //  Replace these with actual values.
    oauth2.put_ClientId(L"CLIENT_ID");
    oauth2.put_ClientSecret(L"CLIENT_SECRET");
    oauth2.put_Scope(L"w_member_social");

    //  Begin the OAuth2 three-legged 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;
    }

    //  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 interactive user to grant permission in the interactive browser session.
    //  We'll wait for a max of 90 seconds.
    int numMsWaited = 0;
    while ((numMsWaited < 90000) && (oauth2.get_AuthFlowState() < 3)) {
        oauth2.SleepMs(100);
        numMsWaited = numMsWaited + 100;
    }

    //  If there was no response from the browser within 90 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 (oauth2.get_AuthFlowState() < 3) {
        oauth2.Cancel();
        wprintf(L"No response from the browser!\n");
        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 (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());

    wprintf(L"Full JSON Response = %s\n",oauth2.accessTokenResponse());

    //  Example JSON Response:
    //  
    //  {
    //    "access_token": "AQU7C5zU8n....ggWyUA",
    //    "expires_in": 5183999,
    //    "scope": "w_member_social"
    //  }

    //  Save the full JSON access token response to a file.
    CkStringBuilderW sbJson;
    sbJson.Append(oauth2.accessTokenResponse());
    sbJson.WriteFile(L"qa_data/tokens/_linkedIn.json",L"utf-8",false);

    //  Here is an example showing how to define your App in the LinkedIn developers console:
    //  
    }