(C) OneDrive with OAuth2 Client Credentials

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Demonstrates how to authenticate with Microsoft OneDrive using OAuth2 client credentials. This example uses a new feature available starting in Chilkat v9.5.0.97, which is to provide the client ID, client secret, and tenant ID to Chilkat, and internally Chilkat will fetch OAuth2 access token via client credentials as necessary. Therefore, it is no longer necessary for the application to explicitly fetch the OAuth2 access token beforehand.

Note: This example requires Chilkat v9.5.0.97 or greater.

For more information, see https://learn.microsoft.com/en-us/onedrive/developer/rest-api/api/drive_list?view=odsp-graph-online

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#include <C_CkJsonObject.h>
#include <C_CkHttp.h>

void ChilkatSample(void)
    {
    HCkJsonObject json;
    HCkHttp http;
    const char *resp;
    HCkJsonObject jsonResp;

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

    // --------------------------------------------------------------------------------------------------------
    // You'll need to have registered an app in Azure beforehand.
    // See How to Create an Azure App Registration for OAuth 2.0 Client Credentials
    // 
    // Note: For OneDrive, your registered app needs one or more of these permissions:  Files.Read.All, Files.ReadWrite.All, Sites.Read.All, Sites.ReadWrite.All
    // --------------------------------------------------------------------------------------------------------

    json = CkJsonObject_Create();

    // Use your App's actual client ID here:
    CkJsonObject_UpdateString(json,"client_id","2871da2c-8176-4b7f-869b-2311aa82e743");

    // Use your App's actual client secret here:
    CkJsonObject_UpdateString(json,"client_secret","2hu9Q~r5QuryUcEkNbg1btLtnfU1VUXzhSCG6brH");

    // Use this specific scope.
    CkJsonObject_UpdateString(json,"scope","https://graph.microsoft.com/.default");

    // Replace the tenant ID part of the URL with your tenant ID.
    CkJsonObject_UpdateString(json,"token_endpoint","https://login.microsoftonline.com/114d7ed6-71bf-4dbe-a866-748364121bf2/oauth2/v2.0/token");

    http = CkHttp_Create();

    CkHttp_putAuthToken(http,CkJsonObject_emit(json));

    // List drives.
    // You can specify a {siteId}, {groupId}, or {userId} in the URL
    // to access document libraries for a group, a site, or a specific user.
    // Use your specific Id instead of what we're using here:
    CkHttp_SetUrlVar(http,"userId","4fe732c3-322e-4a6b-b729-2fd1eb5c6104");
    resp = CkHttp_quickGetStr(http,"https://graph.microsoft.com/v1.0/users/{$userId}/drives");
    if (CkHttp_getLastMethodSuccess(http) != TRUE) {
        printf("%s\n",CkHttp_lastErrorText(http));
        CkJsonObject_Dispose(json);
        CkHttp_Dispose(http);
        return;
    }

    // The response should be JSON.
    jsonResp = CkJsonObject_Create();
    CkJsonObject_putEmitCompact(jsonResp,FALSE);
    CkJsonObject_Load(jsonResp,resp);

    // A successful response should return a status code of 200.
    if (CkHttp_getLastStatus(http) != 200) {
        printf("%s\n",CkJsonObject_emit(jsonResp));
        printf("Response status = %d\n",CkHttp_getLastStatus(http));
        CkJsonObject_Dispose(json);
        CkHttp_Dispose(http);
        CkJsonObject_Dispose(jsonResp);
        return;
    }

    printf("%s\n",CkJsonObject_emit(jsonResp));


    CkJsonObject_Dispose(json);
    CkHttp_Dispose(http);
    CkJsonObject_Dispose(jsonResp);

    }