(C) Azure OAuth2 Client Credentials Grant Flow

See more OAuth2 Examples

Note: Your Azure app must be registered as a single-tenant app to use client credentials.

Note: This example requires Chilkat v11.0.0 or greater.

For more information, see https://docs.microsoft.com/en-us/azure/active-directory/develop/v2-oauth2-client-creds-grant-flow

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

void ChilkatSample(void)
    {
    BOOL success;
    HCkHttp http;
    HCkHttpRequest req;
    const char *url;
    HCkHttpResponse resp;
    int statusCode;
    HCkJsonObject json;

    success = FALSE;

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

    http = CkHttp_Create();

    req = CkHttpRequest_Create();
    CkHttpRequest_AddParam(req,"client_secret","CLIENT_SECRET");
    CkHttpRequest_AddParam(req,"client_id","CLIENT_ID");

    // See Understanding Scopes in Azure OAuth2 Client Credentials Flow
    CkHttpRequest_AddParam(req,"scope","https://graph.microsoft.com/.default");

    CkHttpRequest_AddParam(req,"grant_type","client_credentials");

    // Note: Your Azure app must be registered as a single-tenant app to use client credentials.
    // Use your own tenant ID, for example 4d8fdd66-66d1-43b0-ae5c-e31b4b7de5cd
    url = "https://login.microsoftonline.com/TENANT_ID/oauth2/v2.0/token";

    CkHttpRequest_putHttpVerb(req,"POST");
    CkHttpRequest_putContentType(req,"application/x-www-form-urlencoded");

    resp = CkHttpResponse_Create();
    success = CkHttp_HttpReq(http,url,req,resp);
    if (success == FALSE) {
        printf("%s\n",CkHttp_lastErrorText(http));
        CkHttp_Dispose(http);
        CkHttpRequest_Dispose(req);
        CkHttpResponse_Dispose(resp);
        return;
    }

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

    json = CkJsonObject_Create();
    CkJsonObject_Load(json,CkHttpResponse_bodyStr(resp));

    CkJsonObject_putEmitCompact(json,FALSE);
    printf("%s\n",CkJsonObject_emit(json));

    // Sample successful output:

    // {
    //   "token_type": "Bearer",
    //   "expires_in": 3599,
    //   "ext_expires_in": 3599,
    //   "access_token": "eyJ0eX...K0jOERg"
    // }

    if (statusCode == 200) {
        CkJsonObject_WriteFile(json,"qa_data/tokens/azureClientCredentialsToken.json");
        printf("Success.\n");
    }
    else {
        printf("Failed.\n");
    }



    CkHttp_Dispose(http);
    CkHttpRequest_Dispose(req);
    CkHttpResponse_Dispose(resp);
    CkJsonObject_Dispose(json);

    }