(Unicode C) curl with OAuth2 Client Credentials

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This example shows how to run a simple CURL command with an OAuth2 access token for authorization. We use CURL to retrieve a SharePoint site ID, and Chilkat automatically fetches the OAuth2 access token using the provided credentials.

Note: This example requires Chilkat v11.5.0 or greater.

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#include <C_CkStringBuilderW.h>
#include <C_CkJsonObjectW.h>
#include <C_CkHttpCurlW.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkStringBuilderW sb;
    HCkJsonObjectW jsonOAuth2;
    HCkHttpCurlW httpCurl;
    HCkJsonObjectW responseJson;
    int statusCode;

    success = FALSE;

    // This example will run the following curl command

    // curl -X GET "https://graph.microsoft.com/v1.0/sites/{{sharepoint_hostname}}:/sites/{{site_name}}" \
    //   -H "Authorization: Bearer ACCESS_TOKEN" \
    //   -H "Accept: application/json"

    sb = CkStringBuilderW_Create();
    CkStringBuilderW_AppendLn(sb,L"curl -X GET \"https://graph.microsoft.com/v1.0/sites/{{sharepoint_hostname}}:/sites/{{site_name}}\" \\");
    CkStringBuilderW_AppendLn(sb,L"  -H \"Authorization: Bearer ACCESS_TOKEN\" \\");
    CkStringBuilderW_AppendLn(sb,L"  -H \"Accept: application/json\"");

    // Build the JSON that provides information for getting the OAuth2 access token using the OAuth2 client credentials flow.
    jsonOAuth2 = CkJsonObjectW_Create();

    CkJsonObjectW_UpdateString(jsonOAuth2,L"oauth2.client_id",L"CLIENT_ID");
    CkJsonObjectW_UpdateString(jsonOAuth2,L"oauth2.client_secret",L"CLIENT_SECRET");
    CkJsonObjectW_UpdateString(jsonOAuth2,L"oauth2.scope",L"https://graph.microsoft.com/.default");
    CkJsonObjectW_UpdateString(jsonOAuth2,L"oauth2.token_endpoint",L"https://login.microsoftonline.com/TENANT_ID/oauth2/v2.0/token");

    httpCurl = CkHttpCurlW_Create();

    // Provide the information for getting the OAuth2 access token from the token endpoint
    // Note: The Authorization header specified in the curl command will be ignored and replaced using the OAuth2 access token obtained at runtime from the token endpoint.
    CkHttpCurlW_SetAuth(httpCurl,jsonOAuth2);

    // The placeholders {{sharepoint_hostname}} and {{site_name}} represent variables that must be defined before execution.
    // When DoYourThing runs the curl command, it automatically substitutes these placeholders with their corresponding values.
    // Below are the values assigned to these variables:
    CkHttpCurlW_SetVar(httpCurl,L"sharepoint_hostname",L"example.sharepoint.com");
    CkHttpCurlW_SetVar(httpCurl,L"site_name",L"test");

    // Run the curl command.
    success = CkHttpCurlW_DoYourThing(httpCurl,CkStringBuilderW_getAsString(sb));
    if (success == FALSE) {
        wprintf(L"%s\n",CkHttpCurlW_lastErrorText(httpCurl));
        CkStringBuilderW_Dispose(sb);
        CkJsonObjectW_Dispose(jsonOAuth2);
        CkHttpCurlW_Dispose(httpCurl);
        return;
    }

    responseJson = CkJsonObjectW_Create();
    CkJsonObjectW_putEmitCompact(responseJson,FALSE);

    CkHttpCurlW_GetResponseJson(httpCurl,responseJson);

    statusCode = CkHttpCurlW_getStatusCode(httpCurl);
    wprintf(L"response status code: %d\n",statusCode);

    wprintf(L"%s\n",CkJsonObjectW_emit(responseJson));


    CkStringBuilderW_Dispose(sb);
    CkJsonObjectW_Dispose(jsonOAuth2);
    CkHttpCurlW_Dispose(httpCurl);
    CkJsonObjectW_Dispose(responseJson);

    }