(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_CkStringBuilder.h>
#include <C_CkJsonObject.h>
#include <C_CkHttpCurl.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkStringBuilder sb;
    HCkJsonObject jsonOAuth2;
    HCkHttpCurl httpCurl;
    HCkJsonObject 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 = CkStringBuilder_Create();
    CkStringBuilder_AppendLn(sb,"curl -X GET \"https://graph.microsoft.com/v1.0/sites/{{sharepoint_hostname}}:/sites/{{site_name}}\" \\");
    CkStringBuilder_AppendLn(sb,"  -H \"Authorization: Bearer ACCESS_TOKEN\" \\");
    CkStringBuilder_AppendLn(sb,"  -H \"Accept: application/json\"");

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

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

    httpCurl = CkHttpCurl_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.
    CkHttpCurl_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:
    CkHttpCurl_SetVar(httpCurl,"sharepoint_hostname","example.sharepoint.com");
    CkHttpCurl_SetVar(httpCurl,"site_name","test");

    // Run the curl command.
    success = CkHttpCurl_DoYourThing(httpCurl,CkStringBuilder_getAsString(sb));
    if (success == FALSE) {
        printf("%s\n",CkHttpCurl_lastErrorText(httpCurl));
        CkStringBuilder_Dispose(sb);
        CkJsonObject_Dispose(jsonOAuth2);
        CkHttpCurl_Dispose(httpCurl);
        return;
    }

    responseJson = CkJsonObject_Create();
    CkJsonObject_putEmitCompact(responseJson,FALSE);

    CkHttpCurl_GetResponseJson(httpCurl,responseJson);

    statusCode = CkHttpCurl_getStatusCode(httpCurl);
    printf("response status code: %d\n",statusCode);

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


    CkStringBuilder_Dispose(sb);
    CkJsonObject_Dispose(jsonOAuth2);
    CkHttpCurl_Dispose(httpCurl);
    CkJsonObject_Dispose(responseJson);

    }