C

SharePoint OAuth2 Client Credentials Authentication

Demonstrates how to authenticate with OAuth 2.0 using the client credentials grant type. This is for SharePoint Online which is the cloud-based service provided by Microsoft as part of Office 365. (Users access SharePoint Online through a web browser, and the service is hosted on Microsoft's servers.) C

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

void ChilkatSample(void)
    {
    BOOL success;
    HCkHttp http;
    HCkJsonObject jsonOAuthCC;
    HCkStringBuilder sbJson;
    int statusCode;
    HCkJsonObject jsonResp;

    success = FALSE;

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

    http = CkHttp_Create();

    // Provide the information needed for Chilkat to automatically fetch the OAuth2.0 
    // access token as needed.
    jsonOAuthCC = CkJsonObject_Create();

    // --------------------------------------------------------------------------------------------------------
    // You'll need to have registered an app in Azure beforehand.
    // See How to Create SharePoint App Registration for OAuth 2.0 Client Credentials
    // --------------------------------------------------------------------------------------------------------

    // Use the values from your App Registration in Azure.
    CkJsonObject_UpdateString(jsonOAuthCC,"client_id","CLIENT_ID");
    CkJsonObject_UpdateString(jsonOAuthCC,"client_secret","SECRET_VALUE");

    // You'll always use this scope for client credentials, because the allowed actions
    // are determined by the App Permissions defined when you registered the app in Azure.
    CkJsonObject_UpdateString(jsonOAuthCC,"scope","https://graph.microsoft.com/.default");

    // The token endpoint includes your tenant ID. 
    CkJsonObject_UpdateString(jsonOAuthCC,"token_endpoint","https://login.microsoftonline.com/TENANT_ID/oauth2/v2.0/token");

    // Provide the OAuth2 information. Chilkat will use this information to automatically fetch the OAuth2 access token as needed,
    CkHttp_putAuthToken(http,CkJsonObject_emit(jsonOAuthCC));

    // Get information about all SharePoint sites.
    sbJson = CkStringBuilder_Create();
    success = CkHttp_QuickGetSb(http,"https://graph.microsoft.com/v1.0/sites/getAllSites",sbJson);
    if (success == FALSE) {
        printf("%s\n",CkHttp_lastErrorText(http));
        CkHttp_Dispose(http);
        CkJsonObject_Dispose(jsonOAuthCC);
        CkStringBuilder_Dispose(sbJson);
        return;
    }

    statusCode = CkHttp_getLastStatus(http);

    printf("Response status code = %d\n",statusCode);

    if (statusCode != 200) {
        printf("%s\n",CkStringBuilder_getAsString(sbJson));
        printf("Failed.\n");
        CkHttp_Dispose(http);
        CkJsonObject_Dispose(jsonOAuthCC);
        CkStringBuilder_Dispose(sbJson);
        return;
    }

    jsonResp = CkJsonObject_Create();
    CkJsonObject_LoadSb(jsonResp,sbJson);
    CkJsonObject_putEmitCompact(jsonResp,FALSE);

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

    // Use this online tool to generate parsing code from sample JSON: 
    // Generate Parsing Code from JSON


    CkHttp_Dispose(http);
    CkJsonObject_Dispose(jsonOAuthCC);
    CkStringBuilder_Dispose(sbJson);
    CkJsonObject_Dispose(jsonResp);

    }