Unicode C

Dropbox: OAuth2 Authorization to Obtain an Access Token

See more Dropbox Examples

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

This example runs the OAuth 2.0 authorization flow that lets the user sign in to Dropbox and authorize your app.

Unicode C

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

void ChilkatSample(void)
    {
    BOOL success;
    HCkOAuth2W oauth2;
    const wchar_t *url;
    int numMsWaited;
    HCkJsonObjectW json;

    success = FALSE;

    //  For more information about the OAuth2, see OAuth 2.0 Authorization Flow

    oauth2 = CkOAuth2W_Create();

    //  The port should match the Authorized Redirect URL in your Dropbox app, 
    //  which would look like "http://localhost:3017/"
    CkOAuth2W_putListenPort(oauth2,3017);

    //  IMPORTANT: One of the OAuth2 redirect URIs for your Dropbox app must be
    //  exactly this string:  http://localhost:3017/

    CkOAuth2W_putAuthorizationEndpoint(oauth2,L"https://www.dropbox.com/oauth2/authorize");
    CkOAuth2W_putTokenEndpoint(oauth2,L"https://api.dropboxapi.com/oauth2/token");

    //  Replace this with your actual Dropbox App Key
    CkOAuth2W_putClientId(oauth2,L"DROPBOX_APP_KEY");

    //  This is for Require Proof Key for Code Exchange (PKCE)
    //  See OAuth2 PKCE Explained
    CkOAuth2W_putCodeChallenge(oauth2,TRUE);
    CkOAuth2W_putCodeChallengeMethod(oauth2,L"S256");

    //  Add token_access_type=offline to also get a refresh token in the response
    CkOAuth2W_AddAuthQueryParam(oauth2,L"token_access_type",L"offline");

    //  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) == FALSE) {
        wprintf(L"%s\n",CkOAuth2W_lastErrorText(oauth2));
        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));
        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");
        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));
        CkOAuth2W_Dispose(oauth2);
        return;
    }

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

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

    wprintf(L"OAuth2 authorization granted!\n");

    json = CkJsonObjectW_Create();
    CkJsonObjectW_Load(json,CkOAuth2W_accessTokenResponse(oauth2));
    CkJsonObjectW_putEmitCompact(json,FALSE);

    wprintf(L"Access Token Response = %s\n",CkJsonObjectW_emit(json));

    //  A sample access token response:

    //  {
    //    "access_token": "...",
    //    "token_type": "bearer",
    //    "expires_in": 14399,
    //    "refresh_token": "...",
    //    "scope": "account_info.read",
    //    "uid": "562542581",
    //    "account_id": "dbid:AACQhDS0E3_Vb72Ynd0F-GxGWdTI2qcTHzA"
    //  }

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

    //  Save the JSON access token response to a file for subsequent use..
    CkJsonObjectW_WriteFile(json,L"qa_data/tokens/dropbox.json");


    CkOAuth2W_Dispose(oauth2);
    CkJsonObjectW_Dispose(json);

    }