(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 <CkStringBuilder.h>
#include <CkJsonObject.h>
#include <CkHttpCurl.h>

void ChilkatSample(void)
    {
    bool 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"

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

    // Build the JSON that provides information for getting the OAuth2 access token using the OAuth2 client credentials flow.
    CkJsonObject jsonOAuth2;

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

    CkHttpCurl httpCurl;

    // 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.
    httpCurl.SetAuth(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:
    httpCurl.SetVar("sharepoint_hostname","example.sharepoint.com");
    httpCurl.SetVar("site_name","test");

    // Run the curl command.
    success = httpCurl.DoYourThing(sb.getAsString());
    if (success == false) {
        std::cout << httpCurl.lastErrorText() << "\r\n";
        return;
    }

    CkJsonObject responseJson;
    responseJson.put_EmitCompact(false);

    httpCurl.GetResponseJson(responseJson);

    int statusCode = httpCurl.get_StatusCode();
    std::cout << "response status code: " << statusCode << "\r\n";

    std::cout << responseJson.emit() << "\r\n";
    }