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(Unicode C) Microsoft Graph OAuth2 Client Credentials Grant FlowDemonstrates how to get a Microsoft Graph access token using the Client Credentials Grant Flow. You can use the OAuth 2.0 client credentials grant specified in RFC 6749, sometimes called two-legged OAuth, to access web-hosted resources by using the identity of an application. This type of grant is commonly used for server-to-server interactions that must run in the background, without immediate interaction with a user. These types of applications are often referred to as daemons or service accounts. For more information, see https://docs.microsoft.com/en-us/azure/active-directory/develop/v2-oauth2-client-creds-grant-flow
#include <C_CkHttpW.h> #include <C_CkHttpRequestW.h> #include <C_CkHttpResponseW.h> #include <C_CkJsonObjectW.h> void ChilkatSample(void) { HCkHttpW http; HCkHttpRequestW req; const wchar_t *url; HCkHttpResponseW resp; int statusCode; HCkJsonObjectW json; // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. http = CkHttpW_Create(); req = CkHttpRequestW_Create(); CkHttpRequestW_AddParam(req,L"client_secret",L"CLIENT_SECRET"); CkHttpRequestW_AddParam(req,L"client_id",L"CLIENT_ID"); // Don't know if the scopes valid for the client credentials grant are different than the scopes for the 3-legged Authorization Code Grant... CkHttpRequestW_AddParam(req,L"scope",L"https://graph.microsoft.com/.default"); CkHttpRequestW_AddParam(req,L"grant_type",L"client_credentials"); // Use your own tenant ID, for example 4d8fdd66-66d1-43b0-ae5c-e31b4b7de5cd url = L"https://login.microsoftonline.com/TENANT_ID/oauth2/v2.0/token"; resp = CkHttpW_PostUrlEncoded(http,url,req); if (CkHttpW_getLastMethodSuccess(http) != TRUE) { wprintf(L"%s\n",CkHttpW_lastErrorText(http)); CkHttpW_Dispose(http); CkHttpRequestW_Dispose(req); return; } statusCode = CkHttpResponseW_getStatusCode(resp); wprintf(L"Response status code = %d\n",statusCode); json = CkJsonObjectW_Create(); CkJsonObjectW_Load(json,CkHttpResponseW_bodyStr(resp)); CkHttpResponseW_Dispose(resp); CkJsonObjectW_putEmitCompact(json,FALSE); wprintf(L"%s\n",CkJsonObjectW_emit(json)); // Sample successful output: // { // "token_type": "Bearer", // "expires_in": 3599, // "ext_expires_in": 3599, // "access_token": "eyJ0eX...K0jOERg" // } if (statusCode == 200) { CkJsonObjectW_WriteFile(json,L"qa_data/tokens/msGraphClientCredentialsToken.json"); wprintf(L"Success.\n"); } else { wprintf(L"Failed.\n"); } CkHttpW_Dispose(http); CkHttpRequestW_Dispose(req); CkJsonObjectW_Dispose(json); } |
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